可是我用开发板厂家提供的程序试了不行。它的程序是把板子直接连接电脑串口，然后用超级终端。我操作系统win7，用的是SecureCRT。下面是主程序。为什么要stm32_eval.h，不用行不行？@file，@author等等是什么？发送字符不是用USART_SendData吗，为什么是printf呢？这里USART_SendData到底做了什么？
不懂的地方太多了，根本不知道怎么找出原因，求大神指导一下。
[mw_shl_code=c,true]/**
******************************************************************************
* @file USART/Printf/main.c
* @author MCD Application Team
* @version V3.3.0
* @date 04/16/2010
* @brief Main program body
******************************************************************************
* @copy
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32_eval.h"
#include <stdio.h>
/** @addtogroup STM32F10x_StdPeriph_Examples
* @{
*/
/** @addtogroup USART_Printf
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/*????III??LED???à???¨??*/
#define RCC_GPIO_LED RCC_APB2Periph_GPIOF /*LED??????GPIO?±??*/
#define LEDn 4 /*????III??LED????*/
#define GPIO_LED GPIOF /*????III??LED????????GPIO×é*/
#define DS1_PIN GPIO_Pin_6 /*DS1??????GPIO????*/
#define DS2_PIN GPIO_Pin_7 /*DS2??????GPIO????*/
#define DS3_PIN GPIO_Pin_8 /*DS3??????GPIO????*/
#define DS4_PIN GPIO_Pin_9 /*DS4??????GPIO????*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
USART_InitTypeDef USART_InitStructure;
/* Private function prototypes -----------------------------------------------*/
#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
set to 'Yes') calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : Delay
* Description : Inserts a delay time.
* Input : nCount: specifies the delay time length.
* Output : None
* Return : None
*******************************************************************************/
void Delay(vu32 nCount)
{
for(; nCount != 0; nCount--);
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*LED??????????*/
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_GPIO_LED, ENABLE);
GPIO_InitStructure.GPIO_Pin = DS1_PIN|DS2_PIN|DS3_PIN|DS4_PIN ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIO_LED, &GPIO_InitStructure);
GPIO_SetBits(GPIO_LED, DS1_PIN|DS2_PIN|DS3_PIN|DS4_PIN); /*??±?LED??*/
/* USARTx configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
/*?®??????????*/
USART_InitStructure.USART_BaudRate = 115200; /*?è???¨??????115200*/
USART_InitStructure.USART_WordLength = USART_WordLength_8b; /*?è??????????8??*/
USART_InitStructure.USART_StopBits = USART_StopBits_1; /*?è??????????1??*/
USART_InitStructure.USART_Parity = USART_Parity_No; /*?????????é*/
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; /*?????????÷??*/
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; /*·?????????*/
/*?ê???®??COM1???±????????GPIO???????ù??????????????????????*/
STM_EVAL_COMInit(COM1, &USART_InitStructure);
printf("\n\r---------------------------------------------\n ");
printf("\n\rWWW.ARMJISHU.COM\n ");
printf("\n\r????III?? ?®??1·??????é???ò\n");
while (1)
{
GPIO_ResetBits(GPIO_LED, DS1_PIN);
Delay(0x3FFFFF);
GPIO_SetBits(GPIO_LED, DS1_PIN);
Delay(0x3FFFFF);
printf("\n\r????III?? ?®??1???????ò\n");
}
}
/**
* @brief Retargets the C library printf function to the USART.
* @param None
* @retval None
*/
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the USART */
USART_SendData(EVAL_COM1, (uint8_t) ch); /*·???????×?·?????*/
/* Loop until the end of transmission */
while (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TC) == RESET)/*????·????ê??*/
{
}
return ch;
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/
[/mw_shl_code]
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发表于 2015-8-1 18:26:12
发表于 2015-8-1 18:26:13
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