STM32F4 discovery board

thienminh_npn · 24/10/12

Mình đang vọc con này, cụ thể là phần UART mà gặp khó khăn. Đã receive đc nhưng mà không hiểu sao transmit thì k. Có ace nào đã chạy đc uart cho mình xin code tham khảo vs.

tungbk · 24/10/12

thienminh_npn said:
Mình đang vọc con này, cụ thể là phần UART mà gặp khó khăn. Đã receive đc nhưng mà không hiểu sao transmit thì k. Có ace nào đã chạy đc uart cho mình xin code tham khảo vs.

Tham khảo file UART_echo này

Code:

/****************************************************************
*
*    Module         : main_UART.c
*    Tool             : KeilC ARM 4.22a
*    Chip             : STM32F407VG
*    History         : 3/12/2011
*    Description    : Day 5
                  + USART1 communicate PC
                  + echo the received character
*               
*    Author        : Dang Anh Tung           
*    Description    : www.payitforward.edu.vn
*               
*
****************************************************************/
 
 
/****************************************************************
*                            IMPORT
****************************************************************/
#include "stm32f4_discovery.h"
 
 
 
/*****************************************************************
*                            DEFINE
******************************************************************/
 
#define    TRUE    1
#define    FALSE    0
 
 
/*****************************************************************
*                      GLOBAL VARIABLE
******************************************************************/
                             
                             
/*****************************************************************
*                        SUBROUTINES
******************************************************************/
void myGPIOInit(void);
void myUARTInit(void);
void mySystemInit(void);
void Delay(void);
 
/****************************************************************
*                        INTERRUPT                                *                   
*****************************************************************/
 
 
 
/****************************************************************
*                        MAIN PROGRAM
****************************************************************/   
int main(void)
{
    uint16_t getChar;
    mySystemInit();
    USART_SendData(USART1, 'A');
    while(1)
    {
        while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
        //CLEAR FLAG : clear by write bit 0 (call USART_ClearFlag()) or read Data register ( call function USART_ReceiveData()
        getChar = USART_ReceiveData(USART1);
        //Echo the character
        USART_SendData(USART1, getChar);           
    }   
}       
 
 
/****************************************************************
** Function name:        SystemInit
**
** Descriptions:        Initiate system
**
** parameters:            None
** Returned value:        None
**
*****************************************************************/
void mySystemInit(void)
{
    /*
    Clock setting is already configured in SystemInit() function
    which is called from startup file (startup_stm32f4xx.s)
    before to branch to application main.
    */
    myGPIOInit();
    myUARTInit();
}   
 
 
/****************************************************************
** Function name:        myGPIOInit
**
** Descriptions:        Initiate system
**
** parameters:            None
** Returned value:        None
**
*****************************************************************/
void myGPIOInit()
{
    GPIO_InitTypeDef  GPIO_InitStructure;
    // GPIOA Periph clock enable
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    // configure PA0 in input mode
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
 
    /* GPIOD Periph clock enable */
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
    /* Configure PD12, PD13, PD14 and PD15 in output pushpull mode */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOD, &GPIO_InitStructure);   
}
 
 
/****************************************************************
** Function name:        myUARTInit
**
** Descriptions:        Initiate system
**
** parameters:            None
** Returned value:        None
**
*****************************************************************/
void myUARTInit(void)
{
    GPIO_InitTypeDef  GPIO_InitStructure;
    USART_InitTypeDef  USART_InitStructure;
    /* Init USART1:
    * PB6 --> USART1_TX
    * PB7 --> USART1_RX
    */
    //Enable clock for UART1 peripheral
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE) ;
 
    //enable clock for TX,RX pins PB6,PB7
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
 
    //enable alternate function at TX,RX pins
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1);      //TX USART1
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);      //RX USART1
 
    // Init GPIO
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;       
 
    //TX PIN
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; 
    GPIO_Init(GPIOB, &GPIO_InitStructure);
 
    //RX PIN
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; 
    GPIO_Init(GPIOB, &GPIO_InitStructure);
 
    //INIT Uart properties
    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_InitStructure.USART_HardwareFlowControl =  USART_HardwareFlowControl_None;
 
    USART_Init(USART1, &USART_InitStructure);
    //enable usart1
    USART_Cmd(USART1, ENABLE);
}
 
/****************************************************************
** Function name:        Delay
**
** Descriptions:        loop in certain time before continue next step
**
** parameters:            None
** Returned value:        None
**
*****************************************************************/
void Delay()
{
    uint32_t count = 16800000;
    while(count--);
}
 
/****************************************************************
* END OF standard form.c
****************************************************************/

thienminh_npn · 24/10/12

Thanks anh Tùng, đã chạy đc sau khi đổi sang cặp pin B6 và B7 giống anh.

STM32F4 discovery board

thienminh_npn

Thành Viên PIF

tungbk

Cố Vấn CLB

thienminh_npn

Thành Viên PIF