我写了个程序测试STM32F030的串口，但是用串口调试助手看不到发送过来的数据。用示波器测TX引脚也没波形，请问有谁知道这是什么原因吗？谢谢！
[mw_shl_code=c,true]/**
******************************************************************************
* @file Project/STM32F0xx_StdPeriph_Templates/main.c
* @author MCD Application Team
* @version V1.5.0
* @date 05-December-2014
* @brief Main program body
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F0xx_StdPeriph_Templates
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/**
* @brief GPIO Config program.
* @param None
* @retval None
*/
void GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//开启PA、PB时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOB,ENABLE);
//串口收发引脚配置
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
//RS485控制引脚配置
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
//RS485发送
GPIO_SetBits(GPIOB,GPIO_Pin_12);
// //RS485接收
// GPIO_ResetBits(GPIOB,GPIO_Pin_12);
//RS485指示灯引脚配置
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_11|GPIO_Pin_12;
GPIO_Init(GPIOA,&GPIO_InitStructure);
//点亮RS485通信标志灯
GPIO_SetBits(GPIOA,GPIO_Pin_11|GPIO_Pin_12);
}
/**
* @brief Simple Delay program.
* @param None
* @retval None
*/
void Delay(__IO uint32_t count)
{
for(;count>0;count--);
}
/**
* @brief USART1 Config program.
* @param None
* @retval None
*/
void USART1_Config(void)
{
USART_InitTypeDef USART_InitStructure;
//打开USART1时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
//PA.2和PA3复用为USART1的收发引脚
GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_1);
//IO配置
GPIO_Config();
//串口参数初始化
USART_InitStructure.USART_BaudRate=9600;
USART_InitStructure.USART_WordLength=USART_WordLength_8b;
USART_InitStructure.USART_StopBits=USART_StopBits_1;
USART_InitStructure.USART_Parity=USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
USART_Init(USART1,&USART_InitStructure);
//开启串口
USART_Cmd(USART1,ENABLE);
}
/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f0xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f0xx.c file
*/
/* Add your application code here
*/
USART1_Config();
/* Infinite loop */
while (1)
{
//发送数据
USART_SendData(USART1,0x30);
//等待发送完成
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET);
//闪烁RS485通信标志灯
GPIO_SetBits(GPIOA,GPIO_Pin_11|GPIO_Pin_12);
Delay(0x9ffff);
GPIO_ResetBits(GPIOA,GPIO_Pin_11|GPIO_Pin_12);
Delay(0x9ffff);
}
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
[/mw_shl_code]
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发表于 2015-8-18 20:45:15
楼主
发表于 2015-8-18 23:24:15
