[英]STM32F0 UART not working
I'm new in ST world. 我是ST世界的新手。 I'm trying to work with UART, so I wrote this code to initializate UART and to send "Hello".
我正在尝试使用UART,因此我编写了这段代码以初始化UART并发送“ Hello”。 I'am using STM32F0 board.
我正在使用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;
}
I'am using UART/USB connector. 我正在使用UART / USB连接器。 The problem is that I don't receive any thing in minicom.
问题是在minicom中我什么也没收到。 When debugging I found that progrom enter in infinite loop
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);
You are mixing up interrupt status flags with the flags used for synchronous polling. 您正在将中断状态标志与用于同步轮询的标志混合在一起。 To send data you must first poll the
USART_FLAG_TXE
flag for the transmit data register empty status and then you can send your byte. 要发送数据,您必须首先轮询
USART_FLAG_TXE
标志以查看发送数据寄存器为空状态,然后才能发送字节。 The USART_IT_TXE
flag is for interrupt use only. USART_IT_TXE
标志仅用于中断。
So, to send a byte, do something like this: 因此,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);
Please see the documentation for the USARTx_ISR
register in RM0091 for further information. 请参阅该文档
USARTx_ISR
在注册RM0091进一步的信息。
You use a function like this 您使用这样的功能
void USART_write(unsigned char *string){
while(*string){
// wait until data register is empty
while( !(USART1->SR & 0x00000040) );
USART_SendData(USART1,*string);
*string++;
}
}
This code is tested on STM3VLDiscovery. 此代码已在STM3VLDiscovery上进行了测试。 You must check register status for your chip,like while( !(USART1->SR & 0x00000040) );
您必须检查芯片的寄存器状态,例如while(!(USART1-> SR&0x00000040));
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.