Having difficulty getting UART5 to do anything on STM32F407

[szbrozek9]

Posted on March 23, 2012 at 21:07

Having difficulty getting UART5 to do anything on STM32F407

#stm32f407-uart

[Tesla DeLorean]

Posted on March 23, 2012 at 22:03

(no text)

The forum would appear to have eaten your carefully crafted question, please try again.

[szbrozek9]

Posted on March 23, 2012 at 22:55

Worst forum software ever indeed. There's FOSS forum software out there that actually works - why not use it?

My problem boils down to not having UART5 do anything. I can send data in and have nothing show up in the receive buffer. I can send data out and see no wiggles on the line. My first assumption is that I've done something dumb in the configuration:

http://pastebin.com/4RvPtnmB

Based on the examples in the STM32F4 standard peripheral library, I don't see any reason why this should not work. I have some, but not great, ability to see the states of registers. I'm using Ride7 but it doesn't have full register decoding yet.

[stephen5489]

Posted on March 24, 2012 at 01:05

I have the same problem, I try to program the STM32, I configure the USART1 but dosen't work, I'm working in uVision Keil and coocox, at next, the main code.

#include ''stm32f10x_gpio.h''

#include ''stm32f10x_i2c.h''

#include ''stm32f10x_rcc.h''

#include ''stm32f10x_usart.h''

#include ''stm32f10x_conf.h''

#include <stdio.h>

USART_InitTypeDef USART_InitTypeDef1={

115200,

USART_WordLength_8b,

USART_StopBits_1,

USART_Parity_No,

(USART_Mode_Rx | USART_Mode_Tx ),

USART_HardwareFlowControl_None

};

void uart_init(){

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA |  RCC_APB2Periph_USART1,ENABLE);

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

GPIO_Init(GPIOA, &GPIO_InitStructure);

USART_Init(USART1,&USART_InitTypeDef1);

USART_Cmd(USART1,ENABLE);

}

int main(void)

{

uart_init();

printf(''Welcome!\r\n'');

    while(1)

    {

    }

}

[stephen5489]

Posted on March 24, 2012 at 01:07

any suggestions?

[alok472]

Posted on March 24, 2012 at 03:52

Did you try the standard Periph Lib example for F40x ? Better to start with the standard example..It always works !

Are you probing the UART pins on MCU or through a Level shifter like ST232 ?

Anything else working on MCU ? Toggling of LED/Heartbeat or any GPIO..?

[Tesla DeLorean]

Posted on March 24, 2012 at 05:25

1.     GPIO_InitStructure.

   GPIO_Pin

   =

   GPIO_PinSource12

   ;

2.     GPIO_Init

   (

   GPIOC,

   &

   GPIO_InitStructure

   )

   ;

4.     GPIO_InitStructure.

   GPIO_Pin

   =

   GPIO_PinSource2

   ;

5.     GPIO_Init

   (

   GPIOD,

   &

   GPIO_InitStructure

   )

   ;

Should be GPIO_Pin_12 and GPIO_Pin_2 respectively

PinSource is an index, Pin is a bit mask. GPIO_Init() permits the initialization of multiple pins on a GPIO bank.

[Tesla DeLorean]

Posted on March 24, 2012 at 05:39

any suggestions?

Please stop hijacking threads with off-topic questions. Open your own threads, and try not to double post the same question, the audience here is finite. STEP ONE : I've suggested before that you call your own print character routine to prove that works. STEP TWO : Once you confirm that, then you'll be in a better position to try retargeting/hosting STDIO functions for your tool chain. For Keil, something like this

/*----------------------------------------------------------------------------
Write character to Serial Port
*----------------------------------------------------------------------------*/
int sendchar (int c) {
if (c == '
') {
while (!(USART1->SR & 0x0080));
USART1->DR = 0x0D;
}
while (!(USART1->SR & 0x0080));
USART1->DR = (c & 0x1FF);
return (c);
}
/*----------------------------------------------------------------------------
Read character from Serial Port (blocking read)
*----------------------------------------------------------------------------*/
int getkey (void) {
while (!(USART1->SR & 0x0020));
return (USART1->DR);
}
#include <
stdio.h
>
#include <
rt_misc.h
>
#pragma import(__use_no_semihosting_swi)
struct __FILE { int handle; /* Add whatever you need here */ };
FILE __stdout;
FILE __stdin;
int fputc(int ch, FILE *f) {
return (sendchar(ch));
}
int fgetc(FILE *f) {
return (getkey());
}
int ferror(FILE *f) {
/* Your implementation of ferror */
return EOF;
}
void _ttywrch(int ch) {
sendchar(ch);
}
void _sys_exit(int return_code) {
label: goto label; /* endless loop */
}

[szbrozek9]

Posted on March 24, 2012 at 07:59

Brilliant, sir. That worked perfectly. I would never have spotted that on my own. Thank you very much!