【瑞萨RA4系列开发板体验】keil重写printf

昨天重装了一下e2_studio，结果Renesas_Flash_Programmer死活装不上了，安装时提示已经安装，注册表也有一万个安装，删也删不完。考虑还是用回到MDK。参照@ jf_92517703大佬的作品，我这里重新写了一遍printf。
这里配置用SCI9来做debug，这样就不用外接uatr转TTL了。
1、先配置systemDBUG,这样才可以选择SCI9

2、SCI9选择如下图：

3、Stack启用UART

4、修改通道数、回调函数：

5、选择PIN为输出到板载的CH340G

6、最后生成keil工程后，找到目录，打开工程：

7、新建bsp_debug_uart.c、bsp_debug_uart.h(大部分是抄@ jf_92517703）部分做了修改：
bsp_debug_uart.c:

#include "bsp_debug_uart.h"
/* 调试串口 UART4 初始化 */
void bsp_uart_init(void)
{
	fsp_err_t err = FSP_SUCCESS;
	err = R_SCI_UART_Open (&g_uart9_ctrl, &g_uart9_cfg);
	assert(FSP_SUCCESS == err);
}

/* 发送完成标志 */
volatile bool uart_send_complete_flag = false;
/* 串口中断回调 */
void user_uart_callback (uart_callback_args_t * p_args)
{
	switch (p_args->event)
	{
		case UART_EVENT_RX_CHAR:
		{
		/* 把串口接收到的数据发送回去 */
		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;
	}
}	

/* 重定向 printf 输出 */
#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_uart0_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

bsp_debug_uart.h

#ifndef __BSP_UART_H__
#define __BSP_UART_H__

#include "hal_data.h"
#include "stdio.h"
void bsp_uart_init(void);

#endif

8、然后在keil下新建目录user，并把bsp_debug_uart.c加进去：

9、hal_enty.c主程序如下：

#include "hal_data.h"
#include <stdio.h>
#include "bsp_debug_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)
{

  bsp_uart_init();

  char char_i[]="hello e2studio";
  int int_i=55;
  float float_i=66.20f;
  printf("hello RA4\r\n");
  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
}

/*******************************************************************************************************************//**
 * 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(&g_ioport_ctrl, g_ioport.p_cfg);
    }
}

#if BSP_TZ_SECURE_BUILD

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 ()
{

}
#endif

10、接DAPlink接到SWD、SCK接品上，下载程序就可以了，运行效果如图：

【感受】由于没有钱买jlink10，还是用Keil+DAPlink比较好。学习了前面大佬的作品，自己才能入门。