本帖最后由 lilijin1995 于 2023-7-11 00:12 编辑
之所以要串口重映射，是因为我发现参考了网上的原理图，把UART的TX和RX接反了，如下图，接收数据流程应该是
RX232->R1IN->R1OUT，但是我这里画反了。
并且也留意到CH32V003可以重映射PD5可以配置TX或RX，
PD6也是一样。如下图
接着我们一起来看一下如何把PD5重映射为URX_,PD6重映射为UTX_；这里参考了该篇帖子：
https://www.makerwitawat.com/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%9B%E0%B8%A5%E0%B8%B5%E0%B9%88%E0%B8%A2%E0%B8%99-port-tx-%E0%B8%AA%E0%B8%B3%E0%B8%AB%E0%B8%A3%E0%B8%B1%E0%B8%9A-ch32v003j4/
- void USART_Printf_Init(uint32_t baudrate)
- {
- GPIO_InitTypeDef GPIO_InitStructure = {0};
- USART_InitTypeDef USART_InitStructure = {0};
- NVIC_InitTypeDef NVIC_InitStructure = {0};
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_USART1 | RCC_APB2Periph_AFIO, ENABLE);
- GPIO_PinRemapConfig(GPIO_PartialRemap2_USART1, ENABLE); // กำหนดค่า REMAP TX:PD6, RX:PD5
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; // กำหนดขา GPIO
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOD, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
- GPIO_Init(GPIOD, &GPIO_InitStructure);
- USART_InitStructure.USART_BaudRate = baudrate;
- 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_Init(USART1, &USART_InitStructure);
- USART_Cmd(USART1, ENABLE);
- 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(USART1, &USART_InitStructure);
- USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
- NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);;
- USART_Cmd(USART1, ENABLE);}
其实这里跟沁恒官方例程基本一致，不过需要通过GPIO_PinRemapConfig重映射，重映射是 通过AFIO寄存器实现的
AFIO_PCFR1的UART1 映射配置低位（配合 AFIO_PCFR1 寄存器
bit21 USART1REMAP1 使用[21,2]）
即GPIO_PinRemapConfig 的参数选择；
#define GPIO_PartialRemap2_USART1 ((uint32_t)0x80200000)
同时我调试的时候发现104电容GND虚焊了，因为铺地了，所以需要加热久一点。
最后的，中断请求安排上。
- void USART1_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
- /*********************************************************************
- * @fn USART1_IRQHandler
- *
- * [url=home.php?mod=space&uid=247401]@brief[/url] This function handles USART3 global interrupt request.
- *
- * [url=home.php?mod=space&uid=266161]@return[/url] none
- */
- void USART1_IRQHandler(void)
- {
- u8 rxData=0;
- if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
- {
- rxData=USART_ReceiveData(USART1);
- USART_ClearFlag(USART1, USART_IT_RXNE);
- UartRecStruct.RxBuf[UartRecStruct.RxCounter]=rxData;
- switch(UartRecStruct.RxCounter)
- {
- case 0:
- {
- if(rxData == 0xAA)
- {
- UartRecStruct.RxCounter++;
- }
- }break;
- case 1:
- {
- if(rxData == 0x55)
- {
- UartRecStruct.RxCounter++;
- }else
- {
- ResetUart(&UartRecStruct);
- }
- }break;
- case 4:
- {
- if(rxData == 0x0D)
- {
- UartRecStruct.RxCounter++;
- }else
- {
- ResetUart(&UartRecStruct);
- }
- }break;
- case 5:
- {
- if(rxData == 0x0A)
- {
- UartRecStruct.RxCounter++;
- UartRecStruct.RxOkFlag=READY;
- USART_SendData(USART1,rxData);
- }else
- {
- ResetUart(&UartRecStruct);
- }
- }break;
- default:
- {
- UartRecStruct.RxCounter++;
- }break;
- }
- }
- }
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