在STM32F303K8上激活失败的USART激活

Question

正在尝试激活并利用sTM32F303K8上的usart1外围设备。正在VisualGDB中使用stdperiph运行它。但是，我无法使用中断模式开始使用USART。即使我探究别针，它们都保持沉默。我想念什么。花了很多天了。

#include <stm32f30x_gpio.h>
#include <stm32f30x_rcc.h>
#include "stm32f30x_usart.h"
#include "stm32f30x_misc.h"
void SysTick_Handler()
{
    msTicks++;
}
void setSysTick()
{
    if (SysTick_Config(SystemCoreClock / 1000))
    {
        while (1) {}
    }
}
void Delay()
{
    int i;
    for (i = 0; i < 1000000; i++)
        asm("nop");
}
void init_peripherals(void)
{
    GPIO_InitTypeDef    GPIO_InitStructure;
    USART_InitTypeDef   USART_InitStructure; 
    NVIC_InitTypeDef    NVIC_InitStructure;
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_9 | GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_1;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource9 | GPIO_PinSource10, GPIO_AF_7);
    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
    USART_Init(USART1, &USART_InitStructure);
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
    USART_Cmd(USART1, ENABLE);
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_Init(&NVIC_InitStructure);
    USART_Cmd(USART1, ENABLE);
}
void USART_puts(USART_TypeDef* usar_tx, volatile char* str)
{
    while (*str)
    {
        while (USART_GetFlagStatus(usar_tx, USART_FLAG_TC) == RESET) {}
        USART_SendData(usar_tx, *str);
        str++;
    }
}
void  USART1_IRQHandler(void) 
{
    if (USART1->ISR & USART_ISR_RXNE)
    {
        const char ch = USART_ReceiveData(USART1);
        if (ch != 'n' && ch != 'r')
        {
            rcvd_str[cnt++] = ch;
        }
        else
        {
            rcvd_str[cnt] = 'r';
            cnt = 0;
            str_buildup = true;
        }
    }
}
int main()
{
    setSysTick();
    init_peripherals();
    char* strr = "Hello Worldn";
    USART_puts(USART1, strr);
    return 0;
}

预期的结果是在串行终端中像实现一样的印刷。我还不能到达那里。

Answer 1

一旦中断到达后，它将开始在上述代码处理程序中相应地执行其处理程序，正在检查终止字符并将字符存储在字符串中，但在离开中断处理程序之前，需要清除中断。NVIC初始化后，再次添加USART_CMD并错过了NVIC_INIT检查这些。

Answer 2

gpio_pinsourcex不应是bitmask。尽管很难知道哪些操作不需要被拆卸