/* * Copyright (c) 2006-2022, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2019-04-16 misonyo first implementation. */ /* * 程序清单:这是一个串口设备 DMA 接收使用例程 * 例程导出了 uart_dma_sample 命令到控制终端 * 命令调用格式:uart_dma_sample uart3 * 命令解释:命令第二个参数是要使用的串口设备名称,为空则使用默认的串口设备 * 程序功能:通过串口输出字符串"hello RT-Thread!",并通过串口输出接收到的数据,然后打印接收到的数据。 */ #include #include #include #include #define LOG_TAG "RS232" #define LOG_LVL LOG_LVL_DBG #include #ifdef WORK_BOARD #define SAMPLE_UART_NAME "uart1" /* 串口设备名称 */ #else #define SAMPLE_UART_NAME "uart3" /* 串口设备名称 */ #endif #ifndef MIN_FRAME_LEN #define MIN_FRAME_LEN 10 #endif /* 串口接收消息结构*/ struct rx_msg { rt_device_t dev; rt_size_t size; }; /* 串口设备句柄 */ static rt_device_t serial; /* 消息队列控制块 */ static struct rt_messagequeue rx_mq; /* 接收数据回调函数 */ static rt_err_t uart_input(rt_device_t dev, rt_size_t size) { resetTM();//重设超时 struct rx_msg msg; rt_err_t result; static rt_size_t cachecnt=0; cachecnt += size; if (cachecnt < MIN_FRAME_LEN) { LOG_W("not enough data, cached and waiting...");//处理半包 return; } msg.dev = dev; msg.size = cachecnt; result = rt_mq_send(&rx_mq, &msg, sizeof(msg)); if ( result == -RT_EFULL) { /* 消息队列满 */ LOG_W("message queue full!"); } cachecnt = 0; return result; } struct rx_msg msg; //extern struct rt_event update_cfg; //extern int time2Str(char *str); static void serial_thread_entry(void *parameter) { // struct rx_msg msg; rt_err_t result; rt_uint32_t rx_length=0;//单次收到的数据长度 static char rx_buffer[RT_SERIAL_RB_BUFSZ + 1]; while (1) { rt_memset(&msg, 0, sizeof(msg)); /* 从消息队列中读取消息*/ result = rt_mq_recv(&rx_mq, &msg, sizeof(msg), RT_WAITING_FOREVER); if (result == RT_EOK) { /* 从串口读取数据*/ rx_length = rt_device_read(msg.dev, 0, rx_buffer, msg.size); if (!rx_length) { LOG_W("read from RS232 error"); continue; } LOG_I("%d Bytes received from RS232",rx_length); LOG_HEX("232rx:",16,rx_buffer,rx_length);//print what received. parseRS232(rx_buffer, rx_length); } } } static int uart_dma_sample(int argc, char *argv[]) { rt_err_t ret = RT_EOK; char uart_name[RT_NAME_MAX]; static char msg_pool[256]; char str[] = {0x01,0x03,0x00,0x00,0x00,0x1d,0x85,0xc3}; if (argc == 2) { rt_strncpy(uart_name, argv[1], RT_NAME_MAX); } else { rt_strncpy(uart_name, SAMPLE_UART_NAME, RT_NAME_MAX); } /* 查找串口设备 */ serial = rt_device_find(uart_name); if (!serial) { rt_kprintf("find %s failed!\n", uart_name); return RT_ERROR; } /* 初始化消息队列 */ rt_mq_init(&rx_mq, "rx_mq", msg_pool, /* 存放消息的缓冲区 */ sizeof(struct rx_msg), /* 一条消息的最大长度 */ sizeof(msg_pool), /* 存放消息的缓冲区大小 */ RT_IPC_FLAG_FIFO); /* 如果有多个线程等待,按照先来先得到的方法分配消息 */ #ifdef TR485 struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT; /* 初 始 化 配 置 参 数 */ /* step2: 修 改 串 口 配 置 参 数 */ config.baud_rate = BAUD_RATE_9600; //修 改 波 特 率 为 9600 config.data_bits = DATA_BITS_8; //数 据 位 8 config.stop_bits = STOP_BITS_1; //停 止 位 1 config.bufsz = 128; //修 改 缓 冲 区 buff size 为 128 config.parity = PARITY_NONE; //无 奇 偶 校 验 位 /* step3: 控 制 串 口 设 备。 通 过 控 制 接 口 传 入 命 令 控 制 字, 与 控 制 参 数 */ rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config); #endif /* 以 DMA 接收及轮询发送方式打开串口设备 */ rt_device_open(serial, RT_DEVICE_FLAG_DMA_RX); /* 设置接收回调函数 */ rt_device_set_rx_indicate(serial, uart_input); /* 发送字符串 */ #ifdef TR485 rt_pin_write(TR485_RE, PIN_HIGH); rt_device_write(serial, 0, str, sizeof(str)); rt_pin_write(TR485_RE, PIN_LOW); #endif /* 创建 serial 线程 */ rt_thread_t thread = rt_thread_create("RS232", serial_thread_entry, RT_NULL, 1024*10, 25+1, 10); /* 创建成功则启动线程 */ if (thread != RT_NULL) { rt_thread_startup(thread); } else { ret = RT_ERROR; } return ret; } /* 导出到 msh 命令列表中 */ //MSH_CMD_EXPORT(uart_dma_sample, uart device dma sample); INIT_COMPONENT_EXPORT(uart_dma_sample); /** * 发送数据到3S * @param din * @param len */ void sendTo3S(uint8_t *din, size_t len) { size_t rst = rt_device_write(serial, 0, din, len); LOG_D("send %d Bytes done.",rst); } #ifdef DEMO void sendData(int argc, char *argv[]) { //待发数据 char str[][50] = { {0x01,0x03,0x00,0x00,0x00,0x1d,0x85,0xc3}, "hello\r\n", {0x5A,0xA5, 0x31, 0x32, 0x19, 0x06, 0x00, 0x01, 0x01, 0x1C, 0xED } }; size_t size[]={8,strlen(str[1]),11};//对应每一维数据长度 size_t index = 0; if (argc == 2) { index = atoi(argv[1]); } size_t rst = rt_device_write(serial, 0, str[index], size[index]); LOG_D("send %d Bytes ok.",rst); } MSH_CMD_EXPORT(sendData,3所串口发送数据,参数为第几组数据) #endif