我弄了一个stm32串口的程序，在调试时发现usart的dr全是零，不是我发送的值而且串口助手也没收到值，麻烦各位大侠帮我看看，提点意见，谢谢！
#include "stm32f10x.h"
GPIO_InitTypeDef GPIO_InitStructure;
void RCC_Configuration(void);
void Delay(uint32_t delaytime);
void GPIO_Configuration(void);
void USART_Configuration(void);
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
USART_Configuration();
GPIO_ResetBits(GPIOA,GPIO_Pin_11); //485只发送
while (1)
{
USART_SendData(USART1, (u8) 0xa4);
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
{
}
Delay(0xaffff);
}
}
void RCC_Configuration(void)
{
SystemInit();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
}
void GPIO_Configuration(void)
{
/*TX在PA9,配置为推挽*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
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_ClockInit(USART1,&USART_ClockInitStructure);
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_Init(USART1,&USART_InitStructure);
USART_Cmd(USART1,ENABLE);
}
void Delay(uint32_t delaytime)
{
for(;delaytime>0;delaytime--);
} |
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![RH$OJ@OJA{2]1P8TFQ~M1PO.jpg](/data/attachment/forum/month_1204/120425144494e14ceeaa1864bb.jpg "RH$OJ@OJA{2]1P8TFQ~M1PO.jpg")
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