1. 前言
- 该模块包含 3 个通用同步异步收发器（USART1/2/3）和 5 个通用异步收发器（UART4/5/6/7/8）。
- 注：对于 CH32V20x_D6、CH32F20x_D6，串口 4 为同步异步收发器（USART4）。本例演示了UART2和USAT3单线半双工模式数据传输和接收，熟悉STM32开发用易上手配置。✨✨✨
这是使用MounRiver Studio开发的项目，支持在RISC-V核心基础硬件CH32V307评估板上使用带有msh Shell的RTOS快速原型。
MCU：CH32V307VCT6，主频 144MHz，FLASH和RAM可配置
l 全双工或半双工的同步或异步通信
l NRZ 数据格式
l 分数波特率发生器，最高 9Mbps
l 可编程数据长度
l 可配置的停止位
l 支持 LIN，IrDA 编码器，智能卡
l 支持 DMA
l 多种中断源
首先，应安装 CH32V307 评估板的驱动程序，打开设备管理器查看USB 端口和外部接口已准备就绪。
2. 软件配置
2.1 安装MounRiver Studio
环境搭建教程：https://blog.csdn.net/VOR234/article/details/128932474
3. UASRT项目测试
3.1 打开UASRT工程
评估板说明及参考例程：https://www.wch.cn/downloads/CH32V307EVT_ZIP.html
进入EXAM目录，就有对应的外设教程
进入USART_HalfDuplex文件下，双击USART_HalfDuplex.wvproj,
打开项目工程如下，main.c在user文件夹下
main.c，杜邦线连接PA2 – PB10
/********************************** (C) COPYRIGHT ******************************* * File Name : main.c * Author : WCH * Version : V1.0.0 * Date : 2021/06/06 * Description : Main program body. ********************************************************************************* * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd. * Attention: This software (modified or not) and binary are used for * microcontroller manufactured by Nanjing Qinheng Microelectronics. *******************************************************************************/ /* *@Note single wire half duplex mode, master/slave mode transceiver routine: Master:USART2_Tx(PA2) Slave:USART3_Tx(PB10) This example demonstrates UART2 and USART3 single-wire half-duplex mode data transmission and reception. Hardware connection:PA2 -- PB10 */ #include "debug.h" /* Global typedef */ typedef enum { FAILED = 0, PASSED = !FAILED } TestStatus; /* Global define */ #define TxSize1 (size(TxBuffer1)) #define TxSize2 (size(TxBuffer2)) #define size(a) (sizeof(a) / sizeof(*(a))) /* Global Variable */ u8 TxBuffer1[] = "*Buffer1 Send from USART2 to USART3 using HalfDuplex Mode!"; /* Send by UART2 */ u8 TxBuffer2[] = "#Buffer2 Send from USART3 to USART2 using HalfDuplex Mode!"; /* Send by UART3 */ u8 RxBuffer1[TxSize1] = {0}; /* USART2 Using */ u8 RxBuffer2[TxSize2] = {0}; /* USART3 Using */ u8 TxCnt1 = 0, RxCnt1 = 0; u8 TxCnt2 = 0, RxCnt2 = 0; TestStatus TransferStatus1 = FAILED; TestStatus TransferStatus2 = FAILED; /********************************************************************* * @fn Buffercmp * * @brief Compares two buffers * * @param Buf1,Buf2 - buffers to be compared * BufferLength - buffer's length * * @return PASSED - Buf1 identical to Buf * FAILED - Buf1 differs from Buf2 */ TestStatus Buffercmp(uint8_t *Buf1, uint8_t *Buf2, uint16_t BufLength) { while(BufLength--) { if(*Buf1 != *Buf2) { return FAILED; } Buf1++; Buf2++; } return PASSED; } /********************************************************************* * @fn USARTx_CFG * * @brief Initializes the USART2 & USART3 peripheral. * * @return none */ void USARTx_CFG(void) { GPIO_InitTypeDef GPIO_InitStructure = {0}; USART_InitTypeDef USART_InitStructure = {0}; RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 | RCC_APB1Periph_USART3, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE); /* USART2 TX-->A.2 */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; /* Only Configure TX Pin */ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOA, &GPIO_InitStructure); /* USART3 TX-->B.10 */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; /* Only Configure TX Pin */ GPIO_Init(GPIOB, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = 115200; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; USART_Init(USART2, &USART_InitStructure); USART_Init(USART3, &USART_InitStructure); USART_Cmd(USART2, ENABLE); USART_Cmd(USART3, ENABLE); USART_HalfDuplexCmd(USART2, ENABLE); USART_HalfDuplexCmd(USART3, ENABLE); } /********************************************************************* * @fn DMA_INIT * * @brief Configures the DMA for USART2 & USART3. * * @return none */ int main(void) { NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); SystemCoreClockUpdate(); Delay_Init(); USART_Printf_Init(115200); printf("SystemClk:%d\r\n", SystemCoreClock); printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() ); printf("USART HalfDuplex TEST\r\n"); USARTx_CFG(); /* USART2 & USART3 INIT */ while(TxCnt2 < TxSize2) /* USART3--->USART2 */ { while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET) /* waiting for sending finish */ { } USART_SendData(USART3, TxBuffer2[TxCnt2++]); while(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET) { } RxBuffer1[RxCnt1++] = USART_ReceiveData(USART2); } while(TxCnt1 < TxSize1) /* USART2--->USART3 */ { while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET) /* waiting for sending finish */ { } USART_SendData(USART2, TxBuffer1[TxCnt1++]); while(USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == RESET) { } RxBuffer2[RxCnt2++] = USART_ReceiveData(USART3); } TransferStatus1 = Buffercmp(TxBuffer1, RxBuffer2, TxSize1); TransferStatus2 = Buffercmp(TxBuffer2, RxBuffer1, TxSize2); if(TransferStatus1 && TransferStatus2) { printf("\r\nSend Success!\r\n"); } else { printf("\r\nSend Fail!\r\n"); } printf("TxBuffer1---->RxBuffer2 TxBuffer2---->RxBuffer1\r\n"); printf("TxBuffer1:%s\r\n", TxBuffer1); printf("RxBuffer1:%s\r\n", RxBuffer1); printf("TxBuffer2:%s\r\n", TxBuffer2); printf("RxBuffer2:%s\r\n", RxBuffer2); while(1) { } }
3.2 编译项目
开发板数据线连接电脑就可以开始连接调试🛹🛹🛹，首先开始编译，编译成功如下
然后下载，下载成功如下
4. 下载验证
4.1 接线
根据程序设计调试，可以用杜邦线连接PA2 – PB10，即可输出通讯实验成功
4.2 演示效果
代码下载后验证，点击串口调试器，设置串口参数确认。
复位运行成功如下打印发送成功。
SystemClk:96000000 ChipID:30700518 USART HalfDuplex TEST Send Success! TxBuffer1---->RxBuffer2 TxBuffer2---->RxBuffer1 TxBuffer1:*Buffer1 Send from USART2 to USART3 using HalfDuplex Mode! RxBuffer1:#Buffer2 Send from USART3 to USART2 using HalfDuplex Mode! TxBuffer2:#Buffer2 Send from USART3 to USART2 using HalfDuplex Mode! RxBuffer2:*Buffer1 Send from USART2 to USART3 using HalfDuplex Mode!
5. 小结
🥳🥳🥳通过对这篇文章我们掌握了UART2和USAT3单线半双工模式数据传输和接收，尝试与Arduino通讯做更加好玩的实验，进而丰富我们的生活。🛹🛹🛹从而实现对外部世界进行感知，充分认识这个有机与无机的环境，🥳🥳🥳科学地合理地进行创作和发挥效益，然后为人类社会发展贡献一点微薄之力。🤣🤣🤣
