【RA4L1-SENSOR】+ 串口printf 输出

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2025-6-17 00:01:26

892 串口 Printf

测试开发板串口printf打印输出。

一、硬件部分电路

开发板上有USB转串口部分电路，可以直接连接USB实现串口通信功能。

USB转串口部分电路图如下：

串口使用了UART9的通信端口。

二、配置串口

2.1、使能串口9端口

2.2、配置串口9

设置串口参数和串口回调函数

三、代码

3.1、fun_uart.c

#include "hal_data.h"
#include "stdio.h"

volatile bool uart_send_complete_flag = false;


void debug_uart9_callback (uart_callback_args_t * p_args)
{
   switch (p_args->event)
   {
      case UART_EVENT_RX_CHAR:
      {
            R_SCI_UART_Write(&g_uart9_ctrl, (uint8_t *)&(p_args->data), 1);
            break;
      }
      case UART_EVENT_TX_COMPLETE:
      {
            uart_send_complete_flag = true;
            break;
      }
      default:
            break;
   }
}

#if defined __GNUC__ && !defined __clang__
int _write(int fd, char *pBuffer, int size); //防止编译警告
int _write(int fd, char *pBuffer, int size)
{
   (void)fd;
   R_SCI_UART_Write(&g_uart4_ctrl, (uint8_t *)pBuffer, (uint32_t)size);
   while(uart_send_complete_flag == false);
   uart_send_complete_flag = false;

   return size;
}
#else
int fputc(int ch, FILE *f)
{
   (void)f;
   R_SCI_UART_Write(&g_uart9_ctrl, (uint8_t *)&ch, 1);
   while(uart_send_complete_flag == false);
   uart_send_complete_flag = false;

   return ch;
}
#endif


void  init_uart9(void)
{
	fsp_err_t err = FSP_SUCCESS;

	err = R_SCI_UART_Open (&g_uart9_ctrl, &g_uart9_cfg);
	assert(FSP_SUCCESS == err);
}

3.2、fun_uart.h

#ifndef FUN_UART_H_
#define FUN_UART_H_

#include "stdio.h"

void init_uart9(void);

#endif

3.3、hal_entry.c

#include "hal_data.h"

#include "uart/fun_uart.h"

FSP_CPP_HEADER
void R_BSP_WarmStart(bsp_warm_start_event_t event);
FSP_CPP_FOOTER

/*******************************************************************************************************************//**
 * main() is generated by the RA Configuration editor and is used to generate threads if an RTOS is used.  This function
 * is called by main() when no RTOS is used.
 **********************************************************************************************************************/
void hal_entry(void)
{
	init_uart9();
	while(1)
	{
		printf("RA4L1 UART TEST!\\r\\n");
		R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_06_PIN_01, BSP_IO_LEVEL_HIGH);
		R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_06_PIN_10, BSP_IO_LEVEL_HIGH);
		R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_06_PIN_09, BSP_IO_LEVEL_HIGH);

		R_BSP_SoftwareDelay (100, BSP_DELAY_UNITS_MILLISECONDS);

		R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_06_PIN_01, BSP_IO_LEVEL_LOW);
		R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_06_PIN_10, BSP_IO_LEVEL_LOW);
		R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_06_PIN_09, BSP_IO_LEVEL_LOW);
		R_BSP_SoftwareDelay (100, BSP_DELAY_UNITS_MILLISECONDS);
	}


#if BSP_TZ_SECURE_BUILD
    /* Enter non-secure code */
    R_BSP_NonSecureEnter();
#endif
}

/*******************************************************************************************************************//**
 * This function is called at various points during the startup process.  This implementation uses the event that is
 * called right before main() to set up the pins.
 *
 * @param[in]  event    Where at in the start up process the code is currently at
 **********************************************************************************************************************/
void R_BSP_WarmStart (bsp_warm_start_event_t event)
{
    if (BSP_WARM_START_RESET == event)
    {
#if BSP_FEATURE_FLASH_LP_VERSION != 0

        /* Enable reading from data flash. */
        R_FACI_LP->DFLCTL = 1U;

        /* Would normally have to wait tDSTOP(6us) for data flash recovery. Placing the enable here, before clock and
         * C runtime initialization, should negate the need for a delay since the initialization will typically take more than 6us. */
#endif
    }

    if (BSP_WARM_START_POST_C == event)
    {
        /* C runtime environment and system clocks are setup. */

        /* Configure pins. */
        R_IOPORT_Open(&IOPORT_CFG_CTRL, &IOPORT_CFG_NAME);

#if BSP_CFG_SDRAM_ENABLED

        /* Setup SDRAM and initialize it. Must configure pins first. */
        R_BSP_SdramInit(true);
#endif
    }
}

#if BSP_TZ_SECURE_BUILD

FSP_CPP_HEADER
BSP_CMSE_NONSECURE_ENTRY void template_nonsecure_callable ();

/* Trustzone Secure Projects require at least one nonsecure callable function in order to build (Remove this if it is not required to build). */
BSP_CMSE_NONSECURE_ENTRY void template_nonsecure_callable ()
{

}
FSP_CPP_FOOTER

#endif