【RTT驱动框架分析02】-串口驱动分析,松下vs2（松下串口通信协议）

文件名：【RTT驱动框架分析02】-串口驱动分析,松下vs2 【RTT驱动框架分析02】-串口驱动分析 串口驱动学习 0.串口驱动的使用方法 //定义一个时间struct rt_event system_event;#define SYS_EVENT_UART_RX_FINISH 0x00000001 /* UART receive data finish event *//*串口接收回调函数 Receive data callback function */static rt_err_t uart_input(rt_device_t dev, rt_size_t size){//有数据到来，通知读取数据rt_event_send(&system_event, SYS_EVENT_UART_RX_FINISH);return RT_EOK;}static void test1_thread_entry(void* parameter){rt_device_t uart_dev;uint8_t data[30] = {0};uint8_t data1[30] = {0};uint16_t i = 0;uint16_t data_length = 0;rt_uint32_t sys_event_recv = 0;rt_err_t result = rt_event_init(&system_event, "event", RT_IPC_FLAG_FIFO);//查找设备uart_dev = rt_device_find("usart3");//打开设备rt_device_open(uart_dev, RT_DEVICE_FLAG_INT_RX);//打开接收/* 注册一个数据接收回调函数*/rt_device_set_rx_indicate(uart_dev, uart_input);for(i=0;i<sizeof(data);i++){data[i]=i+1;}if(RT_EOK == rt_device_open(uart_dev, RT_DEVICE_FLAG_INT_RX))//打开中断{//串口发送数据rt_device_write(uart_dev, RT_NULL, data, sizeof(data)); }while(1){rt_thread_delay(50);/* 等待数据到来事件 */if(RT_EOK == rt_event_recv(&system_event, SYS_EVENT_UART_RX_FINISH, RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR, 10, &sys_event_recv)){data_length = rt_device_read(uart_dev, RT_NULL, data1, RT_SERIAL_RB_BUFSZ);rt_device_write(uart_dev, RT_NULL, data1, data_length); } }} 串口驱动抽象层 1.串口配置 struct serial_configure{rt_uint32_t baud_rate;rt_uint32_t data_bits :4;rt_uint32_t stop_bits :2;rt_uint32_t parity :2;rt_uint32_t hardwareflow_control :2;rt_uint32_t mode :2;rt_uint32_t bufsz :16;rt_uint32_t reserved :6;}; 2.串口抽象操作 /*** uart operators*/struct rt_uart_ops{//配置函数rt_err_t (*configure)(struct rt_serial_device *serial, struct serial_configure *cfg);//控制函数rt_err_t (*control)(struct rt_serial_device *serial, int cmd, void *arg);//发送一个字符int (*putc)(struct rt_serial_device *serial, char c);//接收一个字符int (*getc)(struct rt_serial_device *serial);//dma数据发送rt_size_t (*dma_transmit)(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction);}; 3.串口驱动抽象 struct rt_serial_device{struct rt_device parent;//RTT设备驱动抽象const struct rt_uart_ops *ops;//串口抽象层操作函数struct serial_configure config;//串口配置void *serial_rx;void *serial_tx;};typedef struct rt_serial_device rt_serial_t; 串口驱动硬件层

这个结构体封装N32L40x相关的串口硬件参数

struct n32l40x_uart{USART_Module* uart_periph; // Todo: 3bits串口号IRQn_Type irqn; // Todo: 7bits 串口中断号 uint32_t per_clk; // Todo: 5bits串口时钟uint32_t tx_gpio_clk; // Todo: 5bits发送引脚时钟uint32_t rx_gpio_clk; // Todo: 5bits接收引脚时钟GPIO_Module* tx_port; // Todo: 4bits发送引脚分gpio分组uint32_t tx_af; // Todo: 4bits发送引脚的复用uint16_t tx_pin; // Todo: 4bits发送引脚pinGPIO_Module* rx_port; // Todo: 4bits接收引脚分gpio分组uint32_t rx_af; // Todo: 4bits接收引脚的复用uint16_t rx_pin; // Todo: 4bits接收引脚pinstruct rt_serial_device * serial; //串口驱动抽象父类char *device_name;//串口名字}; 分析已经有的串口设备驱动程序 定义一个串口配置函数定义一个串口控制函数定义一个串口的单字符发送函数定义一个串口的单字符接收函数定义一个统一的串口中断处理函数在同一的串口处理函数内部，清楚中断标志后，调用父类的中断处理函数 rt_hw_serial_isr定义一个struct rt_uart_ops 对象分别赋值内部的，configure，control，putc，getc，dma_transmit（dma发送非必须）注册串口设备对象 rt_hw_serial_register 如何自己添加或更改一个串口设备

文件在drv_usart.c 文件中修改