RA生态之串口与printf()函数重定向

最新推荐文章于 2025-05-25 23:08:51 发布

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最新推荐文章于 2025-05-25 23:08:51 发布

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文章标签： fpga开发 arm开发单片机

本文链接：https://blog.youkuaiyun.com/qq_33001335/article/details/124800451

本文档详细介绍了如何在E2Studio中配置UART，包括波特率设置、回调函数实现、R_SCI_UART_Write函数使用及printf输出重定向到串口的方法。通过示例代码展示了如何发送和接收数据，并提供了完整的运行流程。

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UART 配置：点击 Stacks->New Stack -> Connectivity -> UART Driver on r_sci_uart

改的地方就上面一处，其他地方默认即可，默认串口配置:115200波特率，无校验一停止通道0

R_SCI_UART_Open()函数:开启和初始化 UART

/* Open the transfer instance with initial configuration. */

fsp_err_t err = R_SCI_UART_Open(&g_uart0_ctrl, &g_uart0_cfg);

assert(FSP_SUCCESS == err);

回调函数 user_uart_callback ():（函数名自定义）:相当于串口中断，在这里的案例是接收中断

volatile bool uart_send_complete_flag = false;

void user_uart_callback (uart_callback_args_t * p_args)

{

        if(p_args->event == UART_EVENT_TX_COMPLETE)

        {

                uart_send_complete_flag = true;

        }

}

R_SCI_UART_Write()函数:进行串口数据输出

unsigned char buff[]="RA E2STUDIO";

uint8_t buff_len = strlen(buff);

err = R_SCI_UART_Write(&g_uart0_ctrl, buff, buff_len);

if(FSP_SUCCESS != err) __BKPT();

while(uart_send_complete_flag == false){}

uart_send_complete_flag = false;

sprintf()函数:这个应该很多人用过了吧

直接给功能示例了:把格式化的数据写入某个字符串缓冲区

sprintf(send_buff, "\nHello World!.\n");

uint8_t len = strlen(send_buff);

err = R_SCI_UART_Write(&g_uart0_ctrl, send_buff, len);

if(FSP_SUCCESS != err) __BKPT();

while(uart_send_complete_flag == false){}

uart_send_complete_flag = false;

memset(send_buff, '\0', sizeof(100));

printf()函数：

式样化输出函数, 一般用于向准则输出设备按规定式样输出消息。

正在编写步骤时经常会用到此函数

设置 E2STUDIO 堆栈：BSP处设置

(RA-Eco-RA2L1-48PIN-V1.0 设置 heap size

0x2000)

(RA-Eco-RA2E1-48PIN-V1.0 设置 heap size

0x1000)

printf 输出重定向到串口:将 printf 的输出重定向到串口， 然后通过串口将数据发送出去

#ifdef __GNUC__                 //串口重定向

#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

#else

#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

#endif

PUTCHAR_PROTOTYPE

{

        err = R_SCI_UART_Write(&g_uart0_ctrl, (uint8_t *)&ch, 1);

        if(FSP_SUCCESS != err) __BKPT();

        while(uart_send_complete_flag == false){}

        uart_send_complete_flag = false;

        return ch;

}

int _write(int fd,char *pBuffer,int size)

{

        for(int i=0;i<size;i++)

        {

        __io_putchar(*pBuffer++);

        }

return size;

}

printf 输出

int int_i=55;

float float_i=66.20f;

char char_i[]="hello e2studio";

while(1)

{

        printf("int_i=%d\n",int_i);

        printf("float_i=%.2f\n",float_i);

        printf("char_i='%s'\n",char_i);

        R_BSP_SoftwareDelay(1000, BSP_DELAY_UNITS_MILLISECONDS); // NOLINT100->160

}

完整例程:

#include "hal_data.h"

#include <stdio.h>

FSP_CPP_HEADER

void R_BSP_WarmStart(bsp_warm_start_event_t event);

FSP_CPP_FOOTER

fsp_err_t err = FSP_SUCCESS;unsigned char send_buff[100];

volatile bool uart_send_complete_flag = false;

void user_uart_callback (uart_callback_args_t * p_args)

{

        if(p_args->event == UART_EVENT_TX_COMPLETE)

        {

                uart_send_complete_flag = true;

        }

}

#ifdef __GNUC__                //串口重定向

#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

#else

#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

#endif

PUTCHAR_PROTOTYPE

{

        err = R_SCI_UART_Write(&g_uart0_ctrl, (uint8_t *)&ch, 1);

        if(FSP_SUCCESS != err) __BKPT();

        while(uart_send_complete_flag == false){}

        uart_send_complete_flag = false;

        return ch;

}

int _write(int fd,char *pBuffer,int size)

{

        for(int i=0;i<size;i++)

        {

                __io_putchar(*pBuffer++);

        }

        return size;

}

void hal_entry(void)

{

        /* TODO: add your own code here */

        /* Open the transfer instance with initial configuration. */

        err = R_SCI_UART_Open(&g_uart0_ctrl, &g_uart0_cfg);

        assert(FSP_SUCCESS == err);

        unsigned char buff[]="RA E2STUDIO";

        uint8_t buff_len = strlen(buff);

        err = R_SCI_UART_Write(&g_uart0_ctrl, buff, buff_len);

        if(FSP_SUCCESS != err) __BKPT();

        while(uart_send_complete_flag == false){}

        uart_send_complete_flag = false;

        sprintf(send_buff, "\nHello World!.\n");

        uint8_t len = strlen(send_buff);

        err = R_SCI_UART_Write(&g_uart0_ctrl, send_buff, len);if(FSP_SUCCESS != err)         __BKPT();

        while(uart_send_complete_flag == false){}

        uart_send_complete_flag = false;

        memset(send_buff, '\0', sizeof(100));

        int int_i=55;

        float float_i=66.20f;

        char char_i[]="hello e2studio";

        while(1)

        {

                printf("int_i=%d\n",int_i);

                printf("float_i=%.2f\n",float_i);

                printf("char_i='%s'\n",char_i);

                R_BSP_SoftwareDelay(1000, BSP_DELAY_UNITS_MILLISECONDS);

                // NOLINT100->160

        }

        #if BSP_TZ_SECURE_BUILD

        /* Enter non-secure code */

        R_BSP_NonSecureEnter();

        #endif

}

效果演示: