STM32一種通用串口功能實現

ID:980286 · 發表于 2021-11-30 11:06

#include "uart.h"

void uart_init(uart_def *uart)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

if (uart->uart_ptr == USART1)// 使能時鐘
{
      RCC_APB2PeriphClockCmd(uart->gpio_rx_rcc | uart->gpio_tx_rcc | uart->uart_rcc, ENABLE);
}
else // USART2 USART3 UART4 UART5
{
      RCC_APB2PeriphClockCmd(uart->gpio_rx_rcc | uart->gpio_tx_rcc, ENABLE);
      RCC_APB1PeriphClockCmd(uart->uart_rcc, ENABLE);
}

// tx gpio 復用推挽輸出
GPIO_InitStructure.GPIO_Pin                      = uart->gpio_tx_pin;
GPIO_InitStructure.GPIO_Speed                      = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode                      = GPIO_Mode_AF_PP;
GPIO_Init(uart->gpio_tx, &GPIO_InitStructure);

//rx gpio 浮動輸入
GPIO_InitStructure.GPIO_Pin                      = uart->gpio_rx_pin;
GPIO_InitStructure.GPIO_Speed                      = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode                      = GPIO_Mode_IN_FLOATING;
GPIO_Init(uart->gpio_rx, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate                = uart->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;
USART_Init(uart->uart_ptr, &USART_InitStructure);

if (uart->uart_ptr == USART1)                                        //串口1開啟空閑中斷 20190715 nl668模塊通訊
{
      USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);
//       USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);                   //開啟串口DMA接收
}
else if(uart->uart_ptr == USART2)                                     //串口2開啟空閑中斷 20190725 cc2530通訊
{
      USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
}

// if(uart->uart_ptr != USART1)                                        //串口1使用的DMA+串口空閑中斷不需要開啟接收中斷
USART_ITConfig(uart->uart_ptr, USART_IT_RXNE, ENABLE);                //使能接收中斷

USART_Cmd(uart->uart_ptr, ENABLE);                                     //使能USARTx

NVIC_InitStructure.NVIC_IRQChannel                = uart->irqn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority       = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd             = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

舉例uart1的功能實現
static uart_def uart;

void uart1_init(uint32_t baudrate)
{
uart.uart_rcc = RCC_APB2Periph_USART1;
uart.uart_ptr = USART1;

uart.gpio_rx_rcc = RCC_APB2Periph_GPIOA;
uart.gpio_rx = GPIOA;
uart.gpio_rx_pin = GPIO_Pin_10;

uart.gpio_tx_rcc = RCC_APB2Periph_GPIOA;
uart.gpio_tx = GPIOA;
uart.gpio_tx_pin = GPIO_Pin_9;

uart.irqn = USART1_IRQn;

uart.baudrate = baudrate;

uart_init(&uart);
}

void uart1_writeb(uint8_t byte)
{
while (USART_GetFlagStatus(uart.uart_ptr, USART_FLAG_TC) == RESET);
USART_SendData(uart.uart_ptr, byte);
while (USART_GetFlagStatus(uart.uart_ptr, USART_FLAG_TXE) == RESET);
}

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STM32一種通用串口功能實現

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