mcu 串口外設(shè)簡介

該芯片內(nèi)置多達(dá) 6 個(gè)通用同步/異步收發(fā)器，USART1/6 接口通信速率可達(dá) 10.5Mbit/s，其它USART/UART 的通信速率可達(dá) 5.25Mbit/s，所有 USART/UART 可配置波特率、奇偶校驗(yàn)位、停止位、數(shù)據(jù)位長度，都可以支持 DMA
函數(shù)庫

本函數(shù)庫主要是用來后期開發(fā)方便使用，將所有的變量封裝在一個(gè)結(jié)構(gòu)體內(nèi)部
該函數(shù)庫使用的是接收非空中斷+空閑中斷的方式收數(shù)據(jù)
頭文件

    #ifndef __BSP_USART_IT_H
    #include "bsp_delay.h"
    #include "apm32f4xx.h"
    #include "apm32f4xx_gpio.h"
    #include "apm32f4xx_eint.h"
    #include "apm32f4xx_rcm.h"
    #include "apm32f4xx_syscfg.h"
    #include "apm32f4xx_misc.h"
    #include "apm32f4xx_usart.h"
    //緩沖區(qū)的大小
    #define RX_BUFF_SIZE 256
    //串口id定義，對(duì)外部的操作均使用該id操作
    typedef enum
    {
    UART_1,
    UART_2,
    UART_NUM
    }em_uart_id;
    //數(shù)據(jù)發(fā)送函數(shù)
    void bsp_uart_send_data(em_uart_id id,uint8_t *dat, uint32_t count);
    //初始化所有配置的串口
    void bsp_uart_it_init_all(void);
    //接收數(shù)據(jù)
    void bsp_uart_recv_data(em_uart_id id,uint8_t *dat, uint32_t *count);
    #endif

源文件文章來源地址http://www.zghlxwxcb.cn/news/detail-599670.html

    /* Includes */
    #include "../usart_it/bsp_uart_it.h"
    #include <string.h>
    typedef struct
    {
    GPIO_T *tx_gpio_grp;
    GPIO_PIN_T tx_pin;
    uint32_t tx_rcc;
    GPIO_PIN_SOURCE_T tx_pin_source;
    GPIO_T *rx_gpio_grp;
    GPIO_PIN_T rx_pin;
    uint32_t rx_rcc;
    GPIO_PIN_SOURCE_T rx_pin_source;
    GPIO_AF_T gpio_af;
    USART_T *uart;
    IRQn_Type irq;
    uint32_t uart_rcc;
    uint8_t rx_buff[RX_BUFF_SIZE];
    uint16_t rx_count;
    uint16_t idle;
    } uart_it_t;
    static uart_it_t uarts_it[]=
    {
    { GPIOA,GPIO_PIN_9,RCM_AHB1_PERIPH_GPIOA,GPIO_PIN_SOURCE_9,
    GPIOA,GPIO_PIN_10,RCM_AHB1_PERIPH_GPIOA,GPIO_PIN_SOURCE_10,GPIO_AF_USART1,
    USART1,USART1_IRQn,RCM_APB2_PERIPH_USART1
    },
    { GPIOA,GPIO_PIN_2,RCM_AHB1_PERIPH_GPIOA,GPIO_PIN_SOURCE_2,
    GPIOA,GPIO_PIN_3,RCM_AHB1_PERIPH_GPIOA,GPIO_PIN_SOURCE_3,GPIO_AF_USART2,
    USART2,USART2_IRQn,RCM_APB1_PERIPH_USART2
    },
    };
    static void bsp_uart_it_config(uart_it_t *puart)
    {
    USART_Config_T usartConfigStruct;
    usartConfigStruct.baudRate = 115200;
    usartConfigStruct.hardwareFlow = USART_HARDWARE_FLOW_NONE;
    usartConfigStruct.mode = USART_MODE_TX_RX;
    usartConfigStruct.parity = USART_PARITY_NONE;
    usartConfigStruct.stopBits = USART_STOP_BIT_1;
    usartConfigStruct.wordLength = USART_WORD_LEN_8B;
    if (puart->uart == USART1 || puart->uart == USART6)
    {
    RCM_EnableAPB2PeriphClock(puart->uart_rcc);
    }
    else
    {
    RCM_EnableAPB1PeriphClock(puart->uart_rcc);
    }
    /** USART configuration */
    USART_Config(puart->uart, &usartConfigStruct);
    /** Enable USART1 RXBNE interrput */
    USART_EnableInterrupt(puart->uart, USART_INT_RXBNE);
    USART_EnableInterrupt(puart->uart,USART_INT_IDLE);
    USART_ClearStatusFlag(puart->uart, USART_FLAG_RXBNE);
    NVIC_EnableIRQRequest(puart->irq,1,0);
    /** Enable USART */
    USART_Enable(puart->uart);
    }
    static void bsp_uart_it_gpio_config(uart_it_t *puart)
    {
    GPIO_Config_T GPIO_configStruct;
    GPIO_ConfigStructInit(&GPIO_configStruct);
    /** 使能gpio的rcc*/
    RCM_EnableAHB1PeriphClock(puart->tx_rcc|puart->rx_rcc );
    /** Connect PXx to USARTx_Tx */
    GPIO_ConfigPinAF(puart->tx_gpio_grp, puart->tx_pin_source, puart->gpio_af);
    /** Connect PXx to USARTx_Rx */
    GPIO_ConfigPinAF(puart->rx_gpio_grp, puart->rx_pin_source, puart->gpio_af);
    /** Configure USART Tx as alternate function push-pull */
    GPIO_configStruct.mode = GPIO_MODE_AF;
    GPIO_configStruct.pin = puart->tx_pin;
    GPIO_configStruct.speed = GPIO_SPEED_50MHz;
    GPIO_Config(puart->tx_gpio_grp, &GPIO_configStruct);
    /** Configure USART Rx as input floating */
    GPIO_configStruct.mode = GPIO_MODE_AF;
    GPIO_configStruct.pin = puart->rx_pin;
    GPIO_Config(puart->rx_gpio_grp, &GPIO_configStruct);
    }
    void bsp_uart_it_init_all(void)
    {
    for(int i=0; i<UART_NUM; i++)
    {
    bsp_uart_it_gpio_config(uarts_it+i);
    bsp_uart_it_config(uarts_it+i);
    }
    }
    void bsp_uart_send_data(em_uart_id id,uint8_t *dat, uint32_t count)
    {
    uart_it_t *puart;
    if(UART_NUM>id)
    puart = uarts_it+id;
    while(puart && count--)
    {
    while(USART_ReadStatusFlag(puart->uart, USART_FLAG_TXBE) == RESET);
    USART_TxData(puart->uart, *dat++);
    }
    }
    #define min(num0,num1) (num0>num1?num1:num0)
    void bsp_uart_recv_data(em_uart_id id,uint8_t *dat, uint32_t *count)
    {
    uart_it_t *puart;
    if(UART_NUM>id)
    puart = uarts_it+id;
    if(puart && dat&&count)
    {
    *count = min(puart->rx_count,*count);
    memcpy(dat, puart->rx_buff,*count);
    puart->rx_count=0;
    }
    else{
    *count=0;
    }
    }
    static void bsp_uart_ira_handler(uart_it_t *puart)
    {
    if(USART_ReadIntFlag(puart->uart, USART_INT_RXBNE) == SET)
    {
    USART_ClearIntFlag(puart->uart, USART_INT_RXBNE);
    puart->rx_buff[puart->rx_count++%RX_BUFF_SIZE] = (uint8_t)USART_RxData(puart->uart);
    }
    else if (USART_ReadIntFlag(puart->uart, USART_INT_IDLE) == SET)
    {
    USART_ClearIntFlag(puart->uart, USART_INT_IDLE);
    puart->idle=1;
    USART_RxData(puart->uart);
    }
    }
    void USART1_IRQHandler(void)
    {
    bsp_uart_ira_handler(uarts_it+UART_1);
    }
    void USART2_IRQHandler(void)
    {
    bsp_uart_ira_handler(uarts_it+UART_2);
    }

## main.c

   uint8_t buff[1024];
 int main(void)
 {
 	bsp_uart_it_init_all();
 	bsp_uart_send_data(UART_1,"HELLO",6);
 	while(1)
 	{
 	bsp_uart_recv_data(UART_1,buff,1024);
 	}
}

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