EmbDev.net

Forum: ARM programming with GCC/GNU tools USART1 issue with a STM32F030R8 Nucleo Board


USART1 issue with a STM32F030R8 Nucleo Board
von Benoit (Guest)

Attached files:
Rate this post
• ▲ useful
▼ not useful 
Hello,

As the title says, I have an issue programming my Nucleo's USART1. It 
seems I am missing something. I had to configure solder bridges in order 
to connect USART1 to Pin PA_2(Tx) and PA_3(Rx) by hardware. I checked 
the connexions and PA_2 and PA_3 are connected to the MCU. Here is my 
code :

main.c :
1
#include "main.h"

2
3
4
int main(void)

5
{

6
    Init();

7
8
    while(1)

9
    {   

10
        USART_SendData(USART1, 0xFF);      

11
        while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); 

12
    }

13
}

14
15
16
/*******************************************************************************

17
* Function Name  : Init

18
* Description    : Initializes USART, GPIOS, Clocks

19
* Input          : None

20
* Output         : None

21
* Return         : None

22
*******************************************************************************/

23
24
void Init(void)

25
{

26
27
    

28
    RCC_HSEConfig(RCC_HSE_OFF); // We are using the Internal clock source

29
30
    /* Initialize Reset Clock Control */

31
32
    RCC_ClocksTypeDef RCC_Clocks;

33
    RCC_GetClocksFreq(&RCC_Clocks);

34
    SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);

35
36
37
    RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI); // Specify we are using the  // internal clock source

38
39
    RCC_USARTCLKConfig(RCC_USART1CLK_HSI); // I wrote this instruction to  // ensure I am using USART1 with HSI, the apllication wasn't working before neither

40
41
    /* Enable GPIO clock */

42
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

43
44
    /* Enable USART1 Clock */

45
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

46
47
48
    GPIO_Config();

49
50
51
    USART_InitTypeDef USART_InitStructure;

52
53
    /* USART Initialisation for MIDI standard */

54
    USART_InitStructure.USART_BaudRate = 31250; 

55
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;

56
    USART_InitStructure.USART_StopBits = USART_StopBits_1;

57
    USART_InitStructure.USART_Parity = USART_Parity_No; 

58
    USART_InitStructure.USART_Mode = USART_Mode_Tx;

59
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

60
    

61
    USART_Init(USART1, &USART_InitStructure);  

62
    

63
    USART_Cmd(USART1, ENABLE);

64
}

65
66
/**

67
* @brief  Configures GPIOS

68
* @param  None

69
* @retval None

70
*/

71
void GPIO_Config(void)

72
{

73
        

74
    GPIO_InitTypeDef GPIO_InitStructure;

75
    

76
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;   

77
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

78
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

79
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

80
    GPIO_Init(GPIOA, &GPIO_InitStructure);

81
    

82
    GPIO_PinAFConfig(GPIOA, GPIO_Pin_2, GPIO_AF_0);

83
    

84
}


main.h :
1
/* Define to prevent recursive inclusion -------------------------------------*/

2
#ifndef __MAIN_H

3
#define __MAIN_H

4
5
/* Includes ------------------------------------------------------------------*/

6
#include "stm32f0xx.h"

7
#include "stm32f0xx_rcc.h"

8
#include "stm32f0xx_it.h"

9
#include "stm32f0xx_gpio.h"

10
#include "stm32f0xx_rtc.h"

11
#include "stm32f0xx_nucleo.h"

12
#include "stm32f0xx_conf.h"

13
#include "stm32f0xx_usart.h"

14
15
/* Exported types ------------------------------------------------------------*/

16
/* Exported constants --------------------------------------------------------*/

17
/* Exported macro ------------------------------------------------------------*/

18
/* Exported functions ------------------------------------------------------- */

19
20
21
void Init(void);

22
void GPIO_Config(void);

23
24
25
#endif /* __MAIN_H */


When I am checking the logic level on PA_2, I find 0. When I am forcing 
PA_2 to 1, it does work.
I would be happy if someone could help me, I am desperate with it.
Thank you in advance.

  


  



  

  
:
    Edited by Admin
  

  


  

    Report post Edit Move Thread sperren Anmeldepflicht aktivieren Anpinnen Delete topic Thread mit anderem zusammenführen Quote selected text Reply Reply with quote
  







      

      



  

    Re: USART1 issue with a STM32F030R8 Nucleo Board
  


  

    

      von
      
        Franz F. (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

  Rate this post
  

  •
  
  ▲ useful 
  

  ▼ not useful 
  		
  

  


  

      
Hey,


Benoit wrote:
> GPIO_PinAFConfig(GPIOA, GPIO_Pin_2, GPIO_AF_0);

STM32F030R8 hasn't mapped USART1 on PA2, please read the datasheet page 
31.
USART1 is available on STM32F030x6 and STM32F030x4 devices only.

Benoit wrote:
> GPIO_PinAFConfig(GPIOA, GPIO_Pin_2, GPIO_AF_0);

I think you have to write GPIO_PinSource2 instead of GPIO_Pin_2.

hope it works

  


  




  

    Report post Edit Delete Quote selected text Reply Reply with quote
  







      

      



  

    Re: USART1 issue with a STM32F030R8 Nucleo Board
  


  

    

      von
      
        Benoit (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

  Rate this post
  

  •
  
  ▲ useful 
  

  ▼ not useful 
  		
  

  


  

      
You were right, PA_2 is actually connected to USART2 on STM32F030R8. 
Yet, I have tried either PinSource2 with USART1, PinSource2 with USART2, 
and GPIO_Pin_2 with USART2, and it still doesn't work. Is my clock 
initialization okay ? Thank you for your attention.

  


  




  

    Report post Edit Delete Quote selected text Reply Reply with quote
  







      

      



  

    Re: USART1 issue with a STM32F030R8 Nucleo Board
  


  

    

      von
      
        Benoit (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

  Rate this post
  

  •
  
  ▲ useful 
  

  ▼ not useful 
  		
  

  


  

      
Okay, I have changed my IDE, and I have found other libraries in C++. I 
used other functions and it works. I may never know my problem though, 
but I will deal with it. Thank you for your answer Franz.

  


  




  

    Report post Edit Delete Quote selected text Reply Reply with quote
  








    

    

       Watch this topic

      |
         Disable multi-page view

    

        


Please log in before posting. Registration is free and takes only a minute.



  Existing account

  


  
  

  
    

      

        
          
        
        
          
        
      

      

        
          
        
        
          
        
      

    


    
    
    





  Do you have a Google/GoogleMail account? No registration required!

  Log in with Google account
  





  No account? Register here.