RA生态:串口和printf()函数重定向

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：

 设置 E2STUDIO 堆栈：BSP处设置

 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:

这篇好文章是转载于：学新通技术网