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投稿：欣瑞利科技@Moxair
1.概述
通过RASC创建一个串口工程，具体配置如下，用户可以根据自己定义来配置串口相关的基本参数。
2.创建工程
STEP1：RASC创建工程
STEP2：选芯片型号跟IDE类型
STEP3：选择芯片型号
STEP4：选择无操作系统
STEP5：勾选确认工程
STEP6：配置串口号跟IO口
STEP7：添加串口驱动
STEP8：配置串口
STEP9：配置串口基本属性
STEP10：生成工程
2.代码
STEP11：打开工程
STEP12：添加代码
STEP13：具体代码如下
void hal_entry( void ) { /* TODO: add your own code here */ fsp_err_t err = R_SCI_UART_Open( &g_uart9_ctrl, &g_uart9_cfg ); assert( FSP_SUCCESS == err ); while ( true ) { printf( "Hello RA MCU \r\n" ); } #if BSP_TZ_SECURE_BUILD /* Enter non-secure code */ R_BSP_NonSecureEnter(); #endif }
STEP14：添加头文件跟串口回调函数
STEP15：具体代码如下
#include "hal_data.h"
#include "stdio.h"
FSP_CPP_HEADER
void R_BSP_WarmStart( bsp_warm_start_event_t event );
FSP_CPP_FOOTER
uint8_t g_transfer_complete = 0;
void g_uart9_cb( uart_callback_args_t* p_args )
{
/* Handle the UART event */
switch ( p_args->event )
{
/* Received a character */
case UART_EVENT_RX_CHAR:
{
break;
}
/* Receive complete */
case UART_EVENT_RX_COMPLETE:
{
break;
}
/* Transmit complete */
case UART_EVENT_TX_COMPLETE:
{
g_transfer_complete = 1;
break;
}
default:
{
}
}
}
STEP16：添加打印接口重定向代码，具体如下
/*******************
*
* Copyright 1998-2017 IAR Systems AB.
*
* This is a template implementation of the "__write" function used by
* the standard library. Replace it with a system-specific
* implementation.
*
* The "__write" function should output "size" number of bytes from
* "buffer" in some application-specific way. It should return the
* number of characters written, or _LLIO_ERROR on failure.
*
* If "buffer" is zero then __write should perform flushing of
* internal buffers, if any. In this case "handle" can be -1 to
* indicate that all handles should be flushed.
*
* The template implementation below assumes that the application
* provides the function "MyLowLevelPutchar". It should return the
* character written, or -1 on failure.
*
********************/
#include <LowLevelIOInterface.h>
#pragma module_name = "?__write"
int MyLowLevelPutchar(int x)
{
R_SCI_UART_Write(&g_uart9_ctrl, (uint8_t *)&x, 1);
while(g_transfer_complete == 0);
g_transfer_complete = 0;
return x;
}
/*
* If the __write implementation uses internal buffering, uncomment
* the following line to ensure that we are called with "buffer" as 0
* (i.e. flush) when the application terminates.
*/
size_t __write(int handle, const unsigned char * buffer, size_t size)
{
/* Remove the #if #endif pair to enable the implementation */
#if 1
size_t nChars = 0;
if (buffer == 0)
{
/*
* This means that we should flush internal buffers. Since we
* don't we just return. (Remember, "handle" == -1 means that all
* handles should be flushed.)
*/
return 0;
}
/* This template only writes to "standard out" and "standard err",
* for all other file handles it returns failure. */
if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR)
{
return _LLIO_ERROR;
}
for (/* Empty */; size != 0; --size)
{
if (MyLowLevelPutchar(*buffer++) < 0)
{
return _LLIO_ERROR;
}
++nChars;
}
return nChars;
#else
/* Always return error code when implementation is disabled. */
return _LLIO_ERROR;
#endif
}
3.工具配置
STEP17：工程配置
STEP18：弹出如下窗口
4.结果
STEP19：接上串口工具，打印如下
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发表于 2022-10-13 22:02:14
