MSPM0L1306: 如何在CCS上编译支持将printf重定向到串口的代码？

uart_loopback.c

/*
 * Copyright (c) 2023, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *notice, this list of conditions and the following disclaimer in the
 *documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *its contributors may be used to endorse or promote products derived
 *from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

// To Using Chinese correctly on UART, please use GBK encoding.

#include "ti_msp_dl_config.h"
#include "string.h"
#include "stdio.h"
#define LineLength  64

/* This results in approximately 10ms of delay assuming 32MHz CPU_CLK */
#define DELAY (320000)

#if 1
//#pragma import(__use_no_semihosting)
//��׼����Ҫ��֧�ֺ���
//struct __FILE 
//{ 
//	int handle; 
//}; 

FILE __stdout;
//����_sys_exit()�Ա���ʹ�ð�����ģʽ
void _sys_exit(int x) 
{ 
	x = x; 
} 
//�ض���fputc���� 
int fputc(int ch, FILE *f)
{ 	
	DL_UART_Main_transmitDataBlocking(UART_0_INST, ch);
	return ch;
}
#endif 

// UART Received Buffer, Max Length = LineLength
volatile uint8_t LineBuffer[LineLength];

// Flag for the UART Received Status
// Bit15 - Finished for Received One Line
// Bit14 - Got '\r' Flag
// Bit13 ~ Bit0 - The Length of the Received Char
volatile uint16_t UART_RX_STA = 0;

int main(void)
{unsigned short times = 0;unsigned short len;unsigned short n;/* Power on GPIO, initialize pins as digital outputs */SYSCFG_DL_init();/* Default: LED1 OFF */DL_GPIO_setPins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_1_PIN );NVIC_ClearPendingIRQ(UART_0_INST_INT_IRQN);//Clear the IRQ FlagNVIC_EnableIRQ(UART_0_INST_INT_IRQN);//Enable the Received Interruptwhile (1) {if(UART_RX_STA & 0x8000)//check the received finish flag{len = UART_RX_STA & 0x3FFF; //Got the Length of the receivedprintf("\r\n�����͵���ϢΪ:\r\n");//Send the received Linefor(n=0; n<len; n++)DL_UART_Main_transmitDataBlocking(UART_0_INST, LineBuffer[n]);printf("\r\n\r\n");UART_RX_STA = 0;//Clear the Flag of the Received}else {times ++;if(times % 5000 == 0)//Per 50S{printf("\r\nMSPM0+ UART����ʵ��\r\n");printf("HardwareLab@���пƴ�\r\n");}if(times %200 == 0) printf("���������ݣ��Իس�����: \r\n");  //Per 2Sif(times % 30 == 0) DL_GPIO_togglePins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_1_PIN );  //Per 300msdelay_cycles(DELAY);}}
}

volatile uint8_t gRxData = 0;

void UART_0_INST_IRQHandler(void)
{switch (DL_UART_Main_getPendingInterrupt(UART_0_INST)) {case DL_UART_MAIN_IIDX_RX:gRxData = DL_UART_Main_receiveData(UART_0_INST);if((UART_RX_STA & 0x8000)==0)  //Receive Not Finished{if(UART_RX_STA&0x4000) //Received 0x0D('\r'){if(gRxData!=0x0a)UART_RX_STA=0;//Received Errorelse UART_RX_STA|=0x8000;  //Received Finished}else //Not Got 0x0D('\r'){if(gRxData==0x0d)UART_RX_STA|=0x4000;else{LineBuffer[UART_RX_STA&0X3FFF]=gRxData ;// Got One Valid CharUART_RX_STA++;if(UART_RX_STA>(LineLength-1))UART_RX_STA=0;//Received Error, Restart Again}}}break;default:break;}
}