我是新来的。我正在尝试使用UART,所以我编写了这段代码来初始化UART并发送“Hello”。我在用STM32F0板。
#include "stm32f0xx_gpio.h"
#include "stm32f0xx_rcc.h"
#include "stm32f0xx_misc.h"
#include "stm32f0xx_usart.h"
#define UINT8 uint8_t
#define UINT32 uint32_t
#define MAX_BUFFER_SIZE 256
typedef struct Buffer_st
{
UINT8 size;
UINT8 data[MAX_BUFFER_SIZE];
}Buffer_st;
Buffer_st receivedDataUART1;
void initUART1(UINT32 baudRate)
{
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//UART init
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_Rx | USART_Mode_Tx;
/* Enable GPIO clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Enable USART clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* Connect PXx to USARTx_Tx */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
/* Connect PXx to USARTx_Rx */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
/* Configure USART Tx, Rx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART configuration */
USART_Init(USART1, &USART_InitStructure);
/* Enable USART */
USART_Cmd(USART1, ENABLE);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
resetReceivedDataBufferUART1();
}
void resetReceivedDataBufferUART1(void)
{
receivedDataUART1.size = 0;
memset(receivedDataUART1.data, MAX_BUFFER_SIZE, 0);
}
UINT8 sendDataUART1(Buffer_st buffer)
{
UINT8 cpt;
for (cpt = 0; cpt < buffer.size; cpt++)
{
USART_SendData(USART1, buffer.data[cpt]);
//Loop until the end of transmission
while (USART_GetFlagStatus(USART1, USART_IT_TXE) == RESET);
}
}
void USART1_IRQHandler(void)
{
if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
receivedDataUART1.data[receivedDataUART1.size++] = USART_ReceiveData(USART1);
}
}
int main(void)
{
Buffer_st buffer = {6,"Hello"};
initUART1(9600);
sendDataUART1(buffer);
while(1);
return 0;
}
我正在使用UART/USB接口。问题是我在minicom没有收到任何东西。调试时我发现progrom进入无限循环
//Loop until the end of transmission
while (USART_GetFlagStatus(USART1, USART_IT_TXE) == RESET);
最佳答案
您正在将中断状态标志与用于同步轮询的标志混合。要发送数据,必须首先轮询传输数据寄存器空状态的USART_FLAG_TXE
标志,然后才能发送字节。USART_IT_TXE
标志仅用于中断。
所以,要发送一个字节,请执行以下操作:
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)!=SET);
USART_SendData(USART1,myByte);
有关详细信息,请参阅RM0091中
USARTx_ISR
注册的文档。关于c - STM32F0 UART不起作用,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/26453539/