Linux内核SPI子系统驱动框架详解
目录
8.3 报错：insmod: ERROR: could not insert module oled_drv.ko: Invalid parameters
1 spi子系统整体架构图
如上图所示是我画的一个spi子系统的整体架构图主要分为用户空间，内核空间 和硬件三大部分，
- 用户空间就是我们的应用程序，
- 内核空间又分为设备驱动层、SPI核心层和SPI控制器驱动层，其中设备驱动层就是具体的SPI设备驱动，这个一般是由普通的驱动工程师负责，然后SPI核心层是内核自带的代码，SPI核心层起到一个承上启下的作用，往下给控制器驱动层提供控制器驱动的注册函数，往上提供标准的SPI收发API以及设备注册函数。然后是SPI控制器驱动层，SPI控制器驱动一般是由芯片原厂编写。
- 硬件空间就是具体的硬件，
当我们在应用程序中调用比如write函数的时候，其实调用的就是spi设备驱动注册进去的file_operations结构体里面的write函数，也就是图中的spidev_write函数，这个spidev_write函数进一步调用的就是spi_write函数，这个spi_write函数就就是在SPI核心层定义的，然后spi_write函数进一步调用的就是SPI控制器驱动程序中的spi_sync函数。
2 SPI控制器驱动和SPI设备驱动软件架构
如上图所示是spi控制器和spi设备的软件架构图，左边是SPI控制器驱动软件结构，右边是SPI设备的软件结构，
- SPI控制器驱动，SPI控制器驱动和SPI控制器设备是挂载到platform_bus_type上的，其中SPI控制器是platform_driver驱动，SPI控制器设备是platform_device类型结构体，内核中的of_platform_default_populate(NULL, NULL, parent);函数会解析设备树中的SPI控制器节点，转换成platform_device结构体，然后会将platform_device增加到内核的设备链表中，platform_driver结构体会被注册到内核的驱动链表中，当增加设备或者驱动的时候，会调用platform_bus_type中的match函数，根据compatible属性进行匹配，当匹配成功后，会调用驱动里面的spi_imx_probe函数，在probe函数里面分配一个spi_master结构体，设置spi_master结构体，调用spi_register_master(spi_master_get(master));注册结构体，然后具体在spi_register_master(spi_master_get(master));函数里面首先会用device_add函数将master->dev注册到内核中，然后还会调用of_register_spi_devices(master);这个函数增加spi_device的，增加spi_device的函数是在register master的时候做的。因为像I2C SPI节点下面的子节点都是由I2C SPI来管理的。然后调用spi_master_initialize_queue(master);，这个函数内部是设置了一些传送函数，后面会重点分析spi_master_initialize_queue(master);。
- SPI设备驱动，首先of_register_spi_devices(struct spi_master *master)函数会解析设备树中的SPI下面的子节点，将子节点转换为spi_device，然后增加到spi_bus_type，另外spi_driver驱动也会被注册到spi_bus_type中，当增加设备或者驱动时，会调用spi_bus_type中的match函数，根据compatible属性进行匹配，匹配成功后probe函数就会被调用，然后再probe函数里面会分配、设置、注册一个file_operation结构体，在这个结构体中就包含了具体的设备的读写函数。
3 SPI控制器驱动的整理流程
如上图所示是SPI控制器的驱动，当增加设备或者驱动时，会调用platform_bus_type中match函数，然后根据compatible属性进行匹配，匹配成功之后probe函数被调用，然后再probe函数中其实主要就是做了分配、设置、注册一个结构体，具体来看在probe函数中
- 首先master = spi_alloc_master(&pdev->dev, sizeof(struct spi_imx_data));分配了一个结构体，然后解析设备书中的控制器的相关信息，比如片选，比如寄存器地址，然后把这些东西赋值给master。
- 然后设置了很多函数，比如spi_imx_setupxfer;函数，这个函数其实就是设置发送接收函数，从上图可以看到这个函数经过一系列的调用，最终调用writel(val, spi_imx->base + MXC_CSPITXDATA); 这就是直接写寄存器的函数了。
- 还有比如spi_imx_transfer;;函数，这个函数其实最终调用的就是上面spi_imx_setupxfer设置的发送接收函数。
- 然后调用rspi_bitbang_start(&spi_imx->bitbang);在这个函数里面首先也是设置了一些函数，比如spi_bitbang_transfer_one;，其实这个函数最终的调用的就是前面spi_imx_setupxfer设置的函数，然后在rspi_bitbang_start(&spi_imx->bitbang);函数里面又调用了spi_register_master(spi_master_get(master));函数，在spi_register_master(spi_master_get(master));函数中主要又调用了device_add函数将设备增加到内核中，然后调用了spi_master_initialize_queue(master);接下来专门用一张图重点看一下spi_master_initialize_queue(master);做了什么。
spi_register_master(spi_master_get(master));函数中主要调用了device_add函数将设备增加到内核中，然后调用了spi_master_initialize_queue(master);接下来重点看一下spi_master_initialize_queue(master)做了什么。
- 在spi_master_initialize_queue(master)里面首先是赋值了master->transfer = spi_queued_transfer这个函数，spi_queued_transfer里面其实是一个传送函数，里面首先会把消息添加到queue的队列，然后检查是否需要启动消息处理：如果master->busy为假且need_pump为真，那么使用kthread_queue_work将master->pump_messages添加到工作队列，以便在稍后的某个时间点处理。
- 然后master->transfer_one_message = spi_transfer_one_message，这里是设置了spi_transfer_one_message函数，这个函数进一步看其实就是master->transfer_one(master, msg->spi, xfer);，那也就是上一张图中的master->transfer_one = spi_bitbang_transfer_one;
- 然后spi_init_queue(master);函数， spi_init_queue函数先初始化kthread_worker，为kthread_worker创建一个内核线程来处理work，随后初始化kthread_work,设置work执行函数，work执行函数为spi_pump_messages。
-
然后是spi_start_queue(master)函数，spi_start_queue就相对简单了，只是唤醒该工作线程而已；自此，队列化的相关工作已经完成，系统等待message请求被发起，然后在工作线程中处理message的传送工作。
4 SPI发送数据过程
我们发送数据的时候，最小单位是spi_transfer,我们将发送数据buf赋值给spi_transfer，然后spi_transfer又会被放到spi_message里面，然后调用__spi_sync函数进行发送，然后在__spi_sync函数里面，
- 设置spi_message完成后回调函数，回调函数中仅仅调用complete函数，唤醒等待唤醒的线程。意思就是，当发送spi_message的工作线程完成发送后，唤醒在等待的spi发送完成的spi_sync函数所在的线程。
- 调用__spi_queued_transfer(spi, message, false)函数，这个函数里面就是将数据添加到发送队列中，检查是否需要启动消息处理：如果master->busy为假且need_pump为真，那么使用kthread_queue_work将master->pump_messages添加到工作队列，以便在稍后的某个时间点处理。
- __spi_pump_messages(master, false);函数，__spi_pump_messages(master, false)，false意思是标记不在工作线程中执行该函数。调用该函数，把spi_message发出去，该函数中会判断当前状态，如果可以直接发，则直接在当前线程中发送，如果不能直接发，则唤醒工作线程，稍后发送。
- wait_for_completion(&done);,睡眠等待发送完成函数释放的完成信号量，当接收到信号量时，证明发送完成唤醒并结束spi_sync函数。
5 SPI设备驱动
接下来看一下spi设备驱动，首先在前面spi控制器驱动中已经解析了spi子节点的内容转换成了spi_device了，然后我们这里编写spi设备驱动，然后当增加设备或者驱动的时候，会调用spi_bus_type里面的match函数，根据compatible属性进行匹配，匹配成功之后会得调用probe函数，在probe函数里面会注册字符设备，然后字符设备里面就有相应的write函数。
6 spidev万能驱动
前面的方式，我们如果想操作一个spi外设，那么由驱动开发人员编写一个spi设备驱动，然后应用开发人员直接使用open/read/write就可以操作相应的spi设备，应用开发人员不需要知道spi设备的具体配置，就把spi设备当成一个文件进行处理。
但是在spidev.c里面的万能驱动采用的是另一种方式，所谓万能驱动，就是我们不需要编写spi_driver，而是在应用程序里面直接操作硬件，这种情况下要求应用编写人员需要去阅读芯片手册，需要知道怎么操作具体的spi外设。
7 费曼学习法：我录制了一个SPI子系统驱动框架讲解视频
根据费曼学习法，把知识点讲出来能够加深对知识点的理解，于是我录制了一个spi子系统驱动框架的讲解视频。
22分钟彻底讲解Linux内核SPI子系统驱动_哔哩哔哩_bilibili
8 OLED驱动程序
8.1写代码
8.1.1 font.h
#ifndef _FONT_H_
#define _FONT_H_
const unsigned char oled_asc2_8x16[95][16]=
{
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},// 0
{0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00},//!1
{0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//"2
{0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00},//#3
{0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00},//$4
{0xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00},//%5
{0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10},//&6
{0x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//'7
{0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00},//(8
{0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00},//)9
{0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00},//*10
{0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00},//+11
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00},//,12
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01},//-13
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00},//.14
{0x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00},///15
{0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00},//016
{0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//117
{0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00},//218
{0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00},//319
{0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00},//420
{0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00},//521
{0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00},//622
{0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00},//723
{0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00},//824
{0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00},//925
{0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00},//:26
{0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00},//;27
{0x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00},//<28
{0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00},//=29
{0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00},//>30
{0x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00},//?31
{0xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00},//@32
{0x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20},//A33
{0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00},//B34
{0xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00},//C35
{0x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00},//D36
{0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00},//E37
{0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00},//F38
{0xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00},//G39
{0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20},//H40
{0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//I41
{0x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00},//J42
{0x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00},//K43
{0x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00},//L44
{0x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00},//M45
{0x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00},//N46
{0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00},//O47
{0x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00},//P48
{0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00},//Q49
{0x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20},//R50
{0x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00},//S51
{0x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00},//T52
{0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00},//U53
{0x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00},//V54
{0xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00},//W55
{0x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20},//X56
{0x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00},//Y57
{0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00},//Z58
{0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00},//[59
{0x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00},//\60
{0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00},//]61
{0x00,0x00,0x04,0x02,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//^62
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80},//_63
{0x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//`64
{0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20},//a65
{0x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00},//b66
{0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00},//c67
{0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20},//d68
{0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00},//e69
{0x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//f70
{0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00},//g71
{0x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20},//h72
{0x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//i73
{0x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00},//j74
{0x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00},//k75
{0x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//l76
{0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F},//m77
{0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20},//n78
{0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00},//o79
{0x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00},//p80
{0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80},//q81
{0x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00},//r82
{0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00},//s83
{0x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00},//t84
{0x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20},//u85
{0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00},//v86
{0x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00},//w87
{0x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00},//x88
{0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00},//y89
{0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00},//z90
{0x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40},//{91
{0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00},//|92
{0x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00},//}93
{0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//~94
};
const unsigned char hz_1616[][32]={
{0x02,0x00,0x02,0x00,0xE2,0xFF,0x22,0x42,0x22,0x42,0x32,0x42,0x2A,0x42,0x26,0x42,0x22,0x42,0x22,0x42,0x22,0x42,0x22,0x42,0xE2,0xFF,0x02,0x00,0x02,0x00,0x00,0x00},/*"百",0*/
{0x00,0x00,0xF8,0xFF,0x01,0x00,0x02,0x00,0x00,0x00,0xE2,0x1F,0x22,0x08,0x22,0x08,0x22,0x08,0xE2,0x1F,0x02,0x00,0x02,0x40,0x02,0x80,0xFE,0x7F,0x00,0x00,0x00,0x00},/*"问",1*/
{0x00,0x00,0xFE,0xFF,0x02,0x10,0x22,0x08,0x42,0x06,0x82,0x01,0x72,0x0E,0x02,0x10,0x22,0x08,0x42,0x06,0x82,0x01,0x72,0x4E,0x02,0x80,0xFE,0x7F,0x00,0x00,0x00,0x00},/*"网",2*/
};
#endif
8.1.2 oled_drv.c
/*
* Simple synchronous userspace interface to SPI devices
*
* Copyright (C) 2006 SWAPP
* Andrea Paterniani <a.paterniani@swapp-eng.it>
* Copyright (C) 2007 David Brownell (simplification, cleanup)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/ioctl.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/compat.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/acpi.h>
#include <linux/spi/spi.h>
#include <linux/spi/spidev.h>
#include <linux/uaccess.h>
#include <linux/gpio/consumer.h>
#define OLED_IOC_INIT 123
#define OLED_IOC_SET_POS 124
//为0 表示命令，为1表示数据
#define OLED_CMD 0
#define OLED_DATA 1
/*-------------------------------------------------------------------------*/
static struct spi_device *oled;
static int major;
static struct gpio_desc *dc_gpio;
static void dc_pin_init(void)
{
gpiod_direction_output(dc_gpio, 1);
}
static void oled_set_dc_pin(int val)
{
gpiod_set_value(dc_gpio, val);
}
static void spi_write_datas(const unsigned char *buf, int len)
{
spi_write(oled, buf, len);
}
/**********************************************************************
* 函数名称： oled_write_cmd
* 功能描述： oled向特定地址写入数据或者命令
* 输入参数：@uc_data :要写入的数据
@uc_cmd:为1则表示写入数据，为0表示写入命令
* 输出参数：无
* 返 回 值： 无
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/04 V1.0 芯晓 创建
***********************************************************************/
static void oled_write_cmd_data(unsigned char uc_data,unsigned char uc_cmd)
{
if(uc_cmd==0)
{
oled_set_dc_pin(0);
}
else
{
oled_set_dc_pin(1);//拉高，表示写入数据
}
spi_write_datas(&uc_data, 1);//写入
}
/**********************************************************************
* 函数名称： oled_init
* 功能描述： oled_init的初始化，包括SPI控制器得初始化
* 输入参数：无
* 输出参数： 初始化的结果
* 返 回 值： 成功则返回0，否则返回-1
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
static int oled_init(void)
{
oled_write_cmd_data(0xae,OLED_CMD);//关闭显示
oled_write_cmd_data(0x00,OLED_CMD);//设置 lower column address
oled_write_cmd_data(0x10,OLED_CMD);//设置 higher column address
oled_write_cmd_data(0x40,OLED_CMD);//设置 display start line
oled_write_cmd_data(0xB0,OLED_CMD);//设置page address
oled_write_cmd_data(0x81,OLED_CMD);// contract control
oled_write_cmd_data(0x66,OLED_CMD);//128
oled_write_cmd_data(0xa1,OLED_CMD);//设置 segment remap
oled_write_cmd_data(0xa6,OLED_CMD);//normal /reverse
oled_write_cmd_data(0xa8,OLED_CMD);//multiple ratio
oled_write_cmd_data(0x3f,OLED_CMD);//duty = 1/64
oled_write_cmd_data(0xc8,OLED_CMD);//com scan direction
oled_write_cmd_data(0xd3,OLED_CMD);//set displat offset
oled_write_cmd_data(0x00,OLED_CMD);//
oled_write_cmd_data(0xd5,OLED_CMD);//set osc division
oled_write_cmd_data(0x80,OLED_CMD);//
oled_write_cmd_data(0xd9,OLED_CMD);//ser pre-charge period
oled_write_cmd_data(0x1f,OLED_CMD);//
oled_write_cmd_data(0xda,OLED_CMD);//set com pins
oled_write_cmd_data(0x12,OLED_CMD);//
oled_write_cmd_data(0xdb,OLED_CMD);//set vcomh
oled_write_cmd_data(0x30,OLED_CMD);//
oled_write_cmd_data(0x8d,OLED_CMD);//set charge pump disable
oled_write_cmd_data(0x14,OLED_CMD);//
oled_write_cmd_data(0xaf,OLED_CMD);//set dispkay on
return 0;
}
//坐标设置
/**********************************************************************
* 函数名称： OLED_DIsp_Set_Pos
* 功能描述：设置要显示的位置
* 输入参数：@ x ：要显示的column address
@y :要显示的page address
* 输出参数： 无
* 返 回 值：
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
static void OLED_DIsp_Set_Pos(int x, int y)
{ oled_write_cmd_data(0xb0+y,OLED_CMD);
oled_write_cmd_data((x&0x0f),OLED_CMD);
oled_write_cmd_data(((x&0xf0)>>4)|0x10,OLED_CMD);
}
static long
spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int x, y;
/* 根据cmd操作硬件 */
switch (cmd)
{
case OLED_IOC_INIT: /* init */
{
dc_pin_init();
oled_init();
break;
}
case OLED_IOC_SET_POS: /* set pos */
{
x = arg & 0xff;
y = (arg >> 8) & 0xff;
OLED_DIsp_Set_Pos(x, y);
break;
}
}
return 0;
}
static ssize_t
spidev_write(struct file *filp, const char __user *buf,
size_t count, loff_t *f_pos)
{
char *ker_buf;
int err;
ker_buf = kmalloc(count, GFP_KERNEL);
err = copy_from_user(ker_buf, buf, count);
oled_set_dc_pin(1);//拉高，表示写入数据
spi_write_datas(ker_buf, count);
kfree(ker_buf);
return count;
}
static const struct file_operations spidev_fops = {
.owner = THIS_MODULE,
/* REVISIT switch to aio primitives, so that userspace
* gets more complete API coverage. It'll simplify things
* too, except for the locking.
*/
.write = spidev_write,
.unlocked_ioctl = spidev_ioctl,
};
/*-------------------------------------------------------------------------*/
/* The main reason to have this class is to make mdev/udev create the
* /dev/spidevB.C character device nodes exposing our userspace API.
* It also simplifies memory management.
*/
static struct class *spidev_class;
static const struct of_device_id spidev_dt_ids[] = {
{ .compatible = "cumtchw,oled" },
{},
};
/*-------------------------------------------------------------------------*/
static int spidev_probe(struct spi_device *spi)
{
/* 1. 记录spi_device */
oled = spi;
/* 2. 注册字符设备 */
major = register_chrdev(0, "cumtchw_oled", &spidev_fops);
spidev_class = class_create(THIS_MODULE, "cumtchw_oled");
device_create(spidev_class, NULL, MKDEV(major, 0), NULL, "cumtchw_oled");
/* 3. 获得GPIO引脚 */
dc_gpio = gpiod_get(&spi->dev, "dc", 0);
return 0;
}
static int spidev_remove(struct spi_device *spi)
{
gpiod_put(dc_gpio);
/* 反注册字符设备 */
device_destroy(spidev_class, MKDEV(major, 0));
class_destroy(spidev_class);
unregister_chrdev(major, "cumtchw_oled");
return 0;
}
static struct spi_driver spidev_spi_driver = {
.driver = {
.name = "cumtchw_spi_oled_drv",
.of_match_table = of_match_ptr(spidev_dt_ids),
},
.probe = spidev_probe,
.remove = spidev_remove,
/* NOTE: suspend/resume methods are not necessary here.
* We don't do anything except pass the requests to/from
* the underlying controller. The refrigerator handles
* most issues; the controller driver handles the rest.
*/
};
/*-------------------------------------------------------------------------*/
static int __init spidev_init(void)
{
int status;
status = spi_register_driver(&spidev_spi_driver);
if (status < 0) {
}
return status;
}
module_init(spidev_init);
static void __exit spidev_exit(void)
{
spi_unregister_driver(&spidev_spi_driver);
}
module_exit(spidev_exit);
MODULE_LICENSE("GPL");
8.1.3 spi_oled.c
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
#include "font.h"
#define OLED_IOC_INIT 123
#define OLED_IOC_SET_POS 124
//为0 表示命令，为1表示数据
#define OLED_CMD 0
#define OLED_DATA 1
static int fd_spidev;
static int dc_pin_num;
void OLED_DIsp_Set_Pos(int x, int y);
void oled_write_datas(const unsigned char *buf, int len)
{
write(fd_spidev, buf, len);
}
/**********************************************************************
* 函数名称： OLED_DIsp_Clear
* 功能描述： 整个屏幕显示数据清0
* 输入参数：无
* 输出参数： 无
* 返 回 值：
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_Clear(void)
{
unsigned char x, y;
char buf[128];
memset(buf, 0, 128);
for (y = 0; y < 8; y++)
{
OLED_DIsp_Set_Pos(0, y);
oled_write_datas(buf, 128);
}
}
/**********************************************************************
* 函数名称： OLED_DIsp_All
* 功能描述： 整个屏幕显示全部点亮，可以用于检查坏点
* 输入参数：无
* 输出参数：无
* 返 回 值：
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_All(void)
{
unsigned char x, y;
char buf[128];
memset(buf, 0xff, 128);
for (y = 0; y < 8; y++)
{
OLED_DIsp_Set_Pos(0, y);
oled_write_datas(buf, 128);
}
}
//坐标设置
/**********************************************************************
* 函数名称： OLED_DIsp_Set_Pos
* 功能描述：设置要显示的位置
* 输入参数：@ x ：要显示的column address
@y :要显示的page address
* 输出参数： 无
* 返 回 值：
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_Set_Pos(int x, int y)
{
ioctl(fd_spidev, OLED_IOC_SET_POS, x | (y << 8));
}
/**********************************************************************
* 函数名称： OLED_DIsp_Char
* 功能描述：在某个位置显示字符 1-9
* 输入参数：@ x ：要显示的column address
@y :要显示的page address
@c ：要显示的字符的ascii码
* 输出参数： 无
* 返 回 值：
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_Char(int x, int y, unsigned char c)
{
int i = 0;
/* 得到字模 */
const unsigned char *dots = oled_asc2_8x16[c - ' '];
/* 发给OLED */
OLED_DIsp_Set_Pos(x, y);
/* 发出8字节数据 */
//for (i = 0; i < 8; i++)
// oled_write_cmd_data(dots[i], OLED_DATA);
oled_write_datas(&dots[0], 8);
OLED_DIsp_Set_Pos(x, y+1);
/* 发出8字节数据 */
//for (i = 0; i < 8; i++)
//oled_write_cmd_data(dots[i+8], OLED_DATA);
oled_write_datas(&dots[8], 8);
}
/**********************************************************************
* 函数名称： OLED_DIsp_String
* 功能描述： 在指定位置显示字符串
* 输入参数：@ x ：要显示的column address
@y :要显示的page address
@str ：要显示的字符串
* 输出参数： 无
* 返 回 值： 无
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_String(int x, int y, char *str)
{
unsigned char j=0;
while (str[j])
{
OLED_DIsp_Char(x, y, str[j]);//显示单个字符
x += 8;
if(x > 127)
{
x = 0;
y += 2;
}//移动显示位置
j++;
}
}
/**********************************************************************
* 函数名称： OLED_DIsp_CHinese
* 功能描述：在指定位置显示汉字
* 输入参数：@ x ：要显示的column address
@y :要显示的page address
@chr ：要显示的汉字，三个汉字“百问网”中选择一个
* 输出参数： 无
* 返 回 值： 无
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_CHinese(unsigned char x,unsigned char y,unsigned char no)
{
unsigned char t,adder=0;
OLED_DIsp_Set_Pos(x,y);
for(t=0;t<16;t++)
{//显示上半截字符
oled_write_datas(&hz_1616[no][t*2], 1);
adder+=1;
}
OLED_DIsp_Set_Pos(x,y+1);
for(t=0;t<16;t++)
{//显示下半截字符
oled_write_datas(&hz_1616[no][t*2+1], 1);
adder+=1;
}
}
/**********************************************************************
* 函数名称： OLED_DIsp_Test
* 功能描述： 整个屏幕显示测试
* 输入参数：无
* 输出参数： 无
* 返 回 值： 无
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_Test(void)
{
int i;
OLED_DIsp_String(0, 0, "https://blog.csdn.net/u013171226");
}
/* spi_oled /dev/cumtchw_oled */
int main(int argc, char **argv)
{
if (argc != 2)
{
printf("Usage: %s /dev/cumtchw_oled\n", argv[0]);
return -1;
}
fd_spidev = open(argv[1], O_RDWR);
if (fd_spidev < 0) {
printf("open %s err\n", argv[1]);
return -1;
}
ioctl(fd_spidev, OLED_IOC_INIT);
OLED_DIsp_Clear();
OLED_DIsp_Test();
return 0;
}
8.1.4 spi_oled.h
#ifndef _OLED_H_
#define _OLED_H_
void oled_write_cmd_data(unsigned char uc_data,unsigned char uc_cmd);
int oled_init(void);
int oled_fill_data(unsigned char fill_Data);
void OLED_DIsp_Clear(void);
void OLED_DIsp_All(void);
void OLED_DIsp_Set_Pos(int x, int y);
void OLED_DIsp_Char(int x, int y, unsigned char c);
void OLED_DIsp_String(int x, int y, char *str);
void OLED_DIsp_CHinese(unsigned char x,unsigned char y,unsigned char no);
void OLED_DIsp_Test();
#endif
8.1.5 Makfile
# 1. 使用不同的开发板内核时, 一定要修改KERN_DIR
# 2. KERN_DIR中的内核要事先配置、编译, 为了能编译内核, 要先设置下列环境变量:
# 2.1 ARCH, 比如: export ARCH=arm64
# 2.2 CROSS_COMPILE, 比如: export CROSS_COMPILE=aarch64-linux-gnu-
# 2.3 PATH, 比如: export PATH=$PATH:/home/book/100ask_roc-rk3399-pc/ToolChain-6.3.1/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin
# 注意: 不同的开发板不同的编译器上述3个环境变量不一定相同,
# 请参考各开发板的高级用户使用手册
KERN_DIR = /data/chw/imx6ull_20230512/bsp/100ask_imx6ull-sdk/Linux-4.9.88
all:
make -C $(KERN_DIR) M=`pwd` modules
$(CROSS_COMPILE)gcc -o spi_oled spi_oled.c
clean:
make -C $(KERN_DIR) M=`pwd` modules clean
rm -rf modules.order spi_oled
obj-m += oled_drv.o
8.1.6 修改设备树文件
在spi1节点下面增加oled的子节点
&ecspi1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1>;
fsl,spi-num-chipselects = <2>;
cs-gpios = <&gpio4 26 GPIO_ACTIVE_LOW>, <&gpio4 24 GPIO_ACTIVE_LOW>;
status = "okay";
oled: oled {
compatible = "cumtchw,oled";
reg = <0>;
spi-max-frequency = <10000000>;
dc-gpios = <&gpio4 20 GPIO_ACTIVE_HIGH>;
};
};8.2 实验
8.2.1 编译设备树
export ARCH=arm
export CROSS_COMPILE=arm-buildroot-linux-gnueabihf-
make dtbs
cp arch/arm/boot/dts/100ask_imx6ull-14x14.dtb /data/chw/imx6ull_20230512/nfs_rootfs/
8.2.2 编译驱动程序和测试程序
export CROSS_COMPILE=arm-buildroot-linux-gnueabihf-
make clean
make all
cp oled_drv.ko spi_oled /data/chw/imx6ull_20230512/nfs_rootfs8.2.3 测试
udhcpc -i eth1
mount -t nfs -o nolock,vers=3 192.168.1.10:/data/chw/imx6ull_20230512/nfs_rootfs /mnt
ls /mnt
cp /mnt/100ask_imx6ull-14x14.dtb /boot
cp /mnt/oled_drv.ko ./
cp /mnt/spi_oled ./
挂载
8.3 报错：insmod: ERROR: could not insert module oled_drv.ko: Invalid parameters
检查了一下为什么我从/mnt拷贝到./目录后，文件大小是0
这里不知道是什么原因，还有的时候我拷贝完，然后我重启开发板，也会发现他可能变成0了。
重新拷贝
然后重新加载
出现设备节点了，cumtchw是我的名字。
然后测试
./spi_oled /dev/cumtchw_oled
如下图所示，显示的是我的csdn博客网址
9 使用spidev万能驱动操作OLED
9.1 font.h
#ifndef _FONT_H_
#define _FONT_H_
const unsigned char oled_asc2_8x16[95][16]=
{
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},// 0
{0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00},//!1
{0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//"2
{0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00},//#3
{0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00},//$4
{0xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00},//%5
{0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10},//&6
{0x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//'7
{0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00},//(8
{0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00},//)9
{0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00},//*10
{0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00},//+11
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00},//,12
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01},//-13
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00},//.14
{0x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00},///15
{0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00},//016
{0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//117
{0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00},//218
{0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00},//319
{0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00},//420
{0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00},//521
{0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00},//622
{0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00},//723
{0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00},//824
{0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00},//925
{0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00},//:26
{0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00},//;27
{0x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00},//<28
{0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00},//=29
{0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00},//>30
{0x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00},//?31
{0xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00},//@32
{0x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20},//A33
{0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00},//B34
{0xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00},//C35
{0x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00},//D36
{0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00},//E37
{0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00},//F38
{0xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00},//G39
{0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20},//H40
{0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//I41
{0x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00},//J42
{0x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00},//K43
{0x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00},//L44
{0x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00},//M45
{0x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00},//N46
{0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00},//O47
{0x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00},//P48
{0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00},//Q49
{0x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20},//R50
{0x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00},//S51
{0x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00},//T52
{0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00},//U53
{0x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00},//V54
{0xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00},//W55
{0x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20},//X56
{0x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00},//Y57
{0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00},//Z58
{0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00},//[59
{0x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00},//\60
{0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00},//]61
{0x00,0x00,0x04,0x02,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//^62
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80},//_63
{0x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//`64
{0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20},//a65
{0x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00},//b66
{0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00},//c67
{0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20},//d68
{0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00},//e69
{0x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//f70
{0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00},//g71
{0x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20},//h72
{0x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//i73
{0x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00},//j74
{0x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00},//k75
{0x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00},//l76
{0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F},//m77
{0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20},//n78
{0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00},//o79
{0x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00},//p80
{0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80},//q81
{0x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00},//r82
{0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00},//s83
{0x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00},//t84
{0x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20},//u85
{0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00},//v86
{0x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00},//w87
{0x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00},//x88
{0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00},//y89
{0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00},//z90
{0x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40},//{91
{0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00},//|92
{0x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00},//}93
{0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},//~94
};
const unsigned char hz_1616[][32]={
{0x02,0x00,0x02,0x00,0xE2,0xFF,0x22,0x42,0x22,0x42,0x32,0x42,0x2A,0x42,0x26,0x42,0x22,0x42,0x22,0x42,0x22,0x42,0x22,0x42,0xE2,0xFF,0x02,0x00,0x02,0x00,0x00,0x00},/*"百",0*/
{0x00,0x00,0xF8,0xFF,0x01,0x00,0x02,0x00,0x00,0x00,0xE2,0x1F,0x22,0x08,0x22,0x08,0x22,0x08,0xE2,0x1F,0x02,0x00,0x02,0x40,0x02,0x80,0xFE,0x7F,0x00,0x00,0x00,0x00},/*"问",1*/
{0x00,0x00,0xFE,0xFF,0x02,0x10,0x22,0x08,0x42,0x06,0x82,0x01,0x72,0x0E,0x02,0x10,0x22,0x08,0x42,0x06,0x82,0x01,0x72,0x4E,0x02,0x80,0xFE,0x7F,0x00,0x00,0x00,0x00},/*"网",2*/
};
#endif
9.2 spi_oled.h
#ifndef _OLED_H_
#define _OLED_H_
void oled_write_cmd_data(unsigned char uc_data,unsigned char uc_cmd);
int oled_init(void);
int oled_fill_data(unsigned char fill_Data);
void OLED_DIsp_Clear(void);
void OLED_DIsp_All(void);
void OLED_DIsp_Set_Pos(int x, int y);
void OLED_DIsp_Char(int x, int y, unsigned char c);
void OLED_DIsp_String(int x, int y, char *str);
void OLED_DIsp_CHinese(unsigned char x,unsigned char y,unsigned char no);
void OLED_DIsp_Test();
#endif
9.3 spi_oled.c
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
#include "font.h"
static int fd_spidev;
static int dc_pin_num;
void OLED_DIsp_Set_Pos(int x, int y);
void dc_pin_init(int number)
{
// echo 509 > /sys/class/gpio/export
// echo out > /sys/class/gpio/gpio509/direction
char cmd[100];
dc_pin_num = number;
sprintf(cmd, "echo %d > /sys/class/gpio/export", number);
system(cmd);
sprintf(cmd, "echo out > /sys/class/gpio/gpio%d/direction", number);
system(cmd);
}
void oled_set_dc_pin(int val)
{
/* echo 1 > /sys/class/gpio/gpio509/value
* echo 0 > /sys/class/gpio/gpio509/value
*/
char cmd[100];
sprintf(cmd, "echo %d > /sys/class/gpio/gpio%d/value", val, dc_pin_num);
system(cmd);
}
void spi_write_datas(const unsigned char *buf, int len)
{
write(fd_spidev, buf, len);
}
void oled_write_datas(const unsigned char *buf, int len)
{
oled_set_dc_pin(1);//拉高，表示写入数据
spi_write_datas(buf, len);
}
/**********************************************************************
* 函数名称： oled_write_cmd
* 功能描述： oled向特定地址写入数据或者命令
* 输入参数：@uc_data :要写入的数据
@uc_cmd:为1则表示写入数据，为0表示写入命令
* 输出参数：无
* 返 回 值： 无
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/04 V1.0 芯晓 创建
***********************************************************************/
void oled_write_cmd_data(unsigned char uc_data,unsigned char uc_cmd)
{
unsigned char uc_read=0;
if(uc_cmd==0)
{
oled_set_dc_pin(0);
}
else
{
oled_set_dc_pin(1);//拉高，表示写入数据
}
spi_write_datas(&uc_data, 1);//写入
}
/**********************************************************************
* 函数名称： oled_init
* 功能描述： oled_init的初始化，包括SPI控制器得初始化
* 输入参数：无
* 输出参数： 初始化的结果
* 返 回 值： 成功则返回0，否则返回-1
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
int oled_init(void)
{
unsigned char uc_dev_id = 0;
oled_write_cmd_data(0xae,OLED_CMD);//关闭显示
oled_write_cmd_data(0x00,OLED_CMD);//设置 lower column address
oled_write_cmd_data(0x10,OLED_CMD);//设置 higher column address
oled_write_cmd_data(0x40,OLED_CMD);//设置 display start line
oled_write_cmd_data(0xB0,OLED_CMD);//设置page address
oled_write_cmd_data(0x81,OLED_CMD);// contract control
oled_write_cmd_data(0x66,OLED_CMD);//128
oled_write_cmd_data(0xa1,OLED_CMD);//设置 segment remap
oled_write_cmd_data(0xa6,OLED_CMD);//normal /reverse
oled_write_cmd_data(0xa8,OLED_CMD);//multiple ratio
oled_write_cmd_data(0x3f,OLED_CMD);//duty = 1/64
oled_write_cmd_data(0xc8,OLED_CMD);//com scan direction
oled_write_cmd_data(0xd3,OLED_CMD);//set displat offset
oled_write_cmd_data(0x00,OLED_CMD);//
oled_write_cmd_data(0xd5,OLED_CMD);//set osc division
oled_write_cmd_data(0x80,OLED_CMD);//
oled_write_cmd_data(0xd9,OLED_CMD);//ser pre-charge period
oled_write_cmd_data(0x1f,OLED_CMD);//
oled_write_cmd_data(0xda,OLED_CMD);//set com pins
oled_write_cmd_data(0x12,OLED_CMD);//
oled_write_cmd_data(0xdb,OLED_CMD);//set vcomh
oled_write_cmd_data(0x30,OLED_CMD);//
oled_write_cmd_data(0x8d,OLED_CMD);//set charge pump disable
oled_write_cmd_data(0x14,OLED_CMD);//
oled_write_cmd_data(0xaf,OLED_CMD);//set dispkay on
return 0;
}
/**********************************************************************
* 函数名称： oled_fill_data
* 功能描述： 整个屏幕显示填充某个固定数据
* 输入参数：@fill_Data：要填充的数据
* 输出参数： 填充结果
* 返 回 值： 成功则返回0
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
int oled_fill_data(unsigned char fill_Data)
{
unsigned char x,y;
for(x=0;x<8;x++)
{
oled_write_cmd_data(0xb0+x,OLED_CMD); //page0-page1
oled_write_cmd_data(0x00,OLED_CMD); //low column start address
oled_write_cmd_data(0x10,OLED_CMD); //high column start address
for(y=0;y<128;y++)
{
oled_write_cmd_data(fill_Data,OLED_DATA);//填充数据
}
}
return 0;
}
/**********************************************************************
* 函数名称： OLED_DIsp_Clear
* 功能描述： 整个屏幕显示数据清0
* 输入参数：无
* 输出参数： 无
* 返 回 值：
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_Clear(void)
{
unsigned char x, y;
char buf[128];
memset(buf, 0, 128);
for (y = 0; y < 8; y++)
{
OLED_DIsp_Set_Pos(0, y);
//for (x = 0; x < 128; x++)
// oled_write_cmd_data(0, OLED_DATA); /* 清零 */
oled_write_datas(buf, 128);
}
}
/**********************************************************************
* 函数名称： OLED_DIsp_All
* 功能描述： 整个屏幕显示全部点亮，可以用于检查坏点
* 输入参数：无
* 输出参数：无
* 返 回 值：
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_All(void)
{
unsigned char x, y;
for (y = 0; y < 8; y++)
{
OLED_DIsp_Set_Pos(0, y);
for (x = 0; x < 128; x++)
oled_write_cmd_data(0xff, OLED_DATA); /* 全点亮 */
}
}
//坐标设置
/**********************************************************************
* 函数名称： OLED_DIsp_Set_Pos
* 功能描述：设置要显示的位置
* 输入参数：@ x ：要显示的column address
@y :要显示的page address
* 输出参数： 无
* 返 回 值：
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_Set_Pos(int x, int y)
{ oled_write_cmd_data(0xb0+y,OLED_CMD);
oled_write_cmd_data((x&0x0f),OLED_CMD);
oled_write_cmd_data(((x&0xf0)>>4)|0x10,OLED_CMD);
}
/**********************************************************************
* 函数名称： OLED_DIsp_Char
* 功能描述：在某个位置显示字符 1-9
* 输入参数：@ x ：要显示的column address
@y :要显示的page address
@c ：要显示的字符的ascii码
* 输出参数： 无
* 返 回 值：
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_Char(int x, int y, unsigned char c)
{
int i = 0;
/* 得到字模 */
const unsigned char *dots = oled_asc2_8x16[c - ' '];
/* 发给OLED */
OLED_DIsp_Set_Pos(x, y);
/* 发出8字节数据 */
//for (i = 0; i < 8; i++)
// oled_write_cmd_data(dots[i], OLED_DATA);
oled_write_datas(&dots[0], 8);
OLED_DIsp_Set_Pos(x, y+1);
/* 发出8字节数据 */
//for (i = 0; i < 8; i++)
//oled_write_cmd_data(dots[i+8], OLED_DATA);
oled_write_datas(&dots[8], 8);
}
/**********************************************************************
* 函数名称： OLED_DIsp_String
* 功能描述： 在指定位置显示字符串
* 输入参数：@ x ：要显示的column address
@y :要显示的page address
@str ：要显示的字符串
* 输出参数： 无
* 返 回 值： 无
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_String(int x, int y, char *str)
{
unsigned char j=0;
while (str[j])
{
OLED_DIsp_Char(x, y, str[j]);//显示单个字符
x += 8;
if(x > 127)
{
x = 0;
y += 2;
}//移动显示位置
j++;
}
}
/**********************************************************************
* 函数名称： OLED_DIsp_CHinese
* 功能描述：在指定位置显示汉字
* 输入参数：@ x ：要显示的column address
@y :要显示的page address
@chr ：要显示的汉字，三个汉字“百问网”中选择一个
* 输出参数： 无
* 返 回 值： 无
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_CHinese(unsigned char x,unsigned char y,unsigned char no)
{
unsigned char t,adder=0;
OLED_DIsp_Set_Pos(x,y);
for(t=0;t<16;t++)
{//显示上半截字符
oled_write_cmd_data(hz_1616[no][t*2],OLED_DATA);
adder+=1;
}
OLED_DIsp_Set_Pos(x,y+1);
for(t=0;t<16;t++)
{//显示下半截字符
oled_write_cmd_data(hz_1616[no][t*2+1],OLED_DATA);
adder+=1;
}
}
/**********************************************************************
* 函数名称： OLED_DIsp_Test
* 功能描述： 整个屏幕显示测试
* 输入参数：无
* 输出参数： 无
* 返 回 值： 无
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/03/15 V1.0 芯晓 创建
***********************************************************************/
void OLED_DIsp_Test(void)
{
int i;
OLED_DIsp_String(0, 0, "wiki.100ask.net");
OLED_DIsp_String(0, 2, "book.100ask.net");
OLED_DIsp_String(0, 4, "bbs.100ask.net");
for(i = 0; i < 3; i++)
{ //显示汉字 百问网
OLED_DIsp_CHinese(32+i*16, 6, i);
}
}
/* spi_oled /dev/spidevB.D <DC_pin_number> */
int main(int argc, char **argv)
{
int dc_pin;
if (argc != 3)
{
printf("Usage: %s <dev/spidevB.D> <DC_pin_number>\n", argv[0]);
return -1;
}
fd_spidev = open(argv[1], O_RDWR);
if (fd_spidev < 0) {
printf("open %s err\n", argv[1]);
return -1;
}
dc_pin = strtoul(argv[2], NULL, 0);
dc_pin_init(dc_pin);
oled_init();
OLED_DIsp_Clear();
OLED_DIsp_Test();
return 0;
}
10 参考文献：
正点原子驱动开发手册
韦东山老师驱动开发大全学习视频
Linux4.9.88内核源码