求助，串口发送数据触发总线异常

代码狗的成长 · 发表于 2014-6-3 13:04:51

程序在软件仿真时可以打印输出，但下载到板子里就没反应，调试了一下发现程序执行到USARTx->DR = (Data & (uint16_t)0x01FF);就会跑到BusFault_Handler里。下面是main.c的源码：

[mw_shl_code=c,true]#include "stm32f10x.h" #include "stm32f10x_usart.h" #include "misc.h" USART_InitTypeDef USART_InitStructure; USART_ClockInitTypeDef USART_ClockInitStructure; uint8_t TxBuffer[]; uint8_t RxBuffer[]; void RCC_Configuration(void); void GPIO_Configuration(void); void NVIC_Configuration(void); void USART_Config(USART_TypeDef* USARTx); int main() { uint8_t i; RCC_Configuration(); NVIC_Configuration(); GPIO_Configuration(); USART_Config(USART1); USART_SendData(USART1, (uint16_t)'!'); USART_FLAG_TC)==RESET); } void GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure); } void RCC_Configuration(void) { SystemInit(); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); } void NVIC_Configuration(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void USART_Config(USART_TypeDef* USARTx) { 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_Rx | USART_Mode_Tx; USART_Init(USARTx, &USART_InitStructure); USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE); USART_Cmd(USARTx, ENABLE); } [/mw_shl_code]

cdshkf · 发表于 2014-6-3 13:04:52

看了下楼猪的程序，拿楼猪程序试了一下果然没有输出，然后改了一个地方，就好了。
楼猪的GPIO配置有问题，如下：
楼猪代码：
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

第二句应该改为 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
USART的串口发送脚要配置成复用模式，而不是简单的输出。