为什么我将程序中的USART1全部改成USART2就不能使用了呢？

stm32yonghu · 发表于 2022-2-26 19:11:59

各位能帮忙看看吗？我这个用USART1可以使用，改成USART2就不能使用了，不知道是不是程序问题。

void Usart2_Init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART_InitStructure.USART_BaudRate = bound;
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(USART2, &USART_InitStructure);

USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_Cmd(USART2, ENABLE);
}

void Usart2_sendstring(char *string)
{
int k=0;
do
{
      USART_SendData(USART2,string[k]);
      while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==RESET);
      k++;
}while(string[k]!='\0');

while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET);
}

主函数中是：
int main(void)
{

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

delay_init();
Usart2_Init(115200);

while(1)
{
      Usart2_sendstring("USART2");
      delay_ms(500);
}