UART example code for STM32F0

[hospodar]

Posted on November 20, 2012 at 23:34

Hello,

I looking for some example code for communication between my ST-DISCOVERY F0 board and PC (UART). Can someone help me with it? I´m novice.

Thank you

[hospodar]

Posted on May 07, 2015 at 22:42

Now, I have three .c files (main.c, fifo.c, stdio_through_usart.c). In all of them is included fifo.h.

fifo.h contains:

#ifndef FIFO_H
#define FIFO_H
#define RXSIZE 1024
#define TXSIZE 512
uint8_t RxBuffer[RXSIZE];
uint8_t TxBuffer[TXSIZE];
typedef
struct
{
char
* buf;
int
head;
int
tail;
int
size;
} fifo_t;
fifo_t RxFifo[1];
fifo_t TxFifo[1];
void
fifo_init(fifo_t * f, 
char
* buf, 
int
size);
int
fifo_read(fifo_t * f, 
void
* buf, 
int
nbytes);
int
fifo_write(fifo_t * f, 
const
void
* buf, 
int
nbytes);
#endif /* FIFO_H */

But now there is new errors. Is this double inclusion? I have defined these arrays just once. Error: L6200E: Symbol RxBuffer multiply defined (by stdio_through_usart.o and main.o). Error: L6200E: Symbol RxBuffer multiply defined (by fifo.o and main.o). Error: L6200E: Symbol TxBuffer multiply defined (by stdio_through_usart.o and main.o). Error: L6200E: Symbol TxBuffer multiply defined (by fifo.o and main.o). Error: L6200E: Symbol RxFifo multiply defined (by stdio_through_usart.o and main.o). Error: L6200E: Symbol RxFifo multiply defined (by fifo.o and main.o). Error: L6200E: Symbol TxFifo multiply defined (by stdio_through_usart.o and main.o). Error: L6200E: Symbol TxFifo multiply defined (by fifo.o and main.o).

[Tesla DeLorean]

Posted on May 08, 2015 at 01:16

Define the actual variables, once, in your .C file, and the refer to them in your .H file with the extern prefix.

[Tesla DeLorean]

Posted on May 08, 2015 at 01:18

http://stackoverflow.com/questions/1433204/how-do-i-use-extern-to-share-variables-between-source-files-in-c

[hospodar]

Posted on May 13, 2015 at 18:43

to be migrated, sourceId: 13890:74F499D6-C293-4561-BFB5-4F1489999957

[Tesla DeLorean]

Posted on May 13, 2015 at 20:02

It's a FIFO, you've presumably already pulled other byte(s) from the buffer, and the tail has moved forward to account for that. It doesn't shift/copy the buffer content, it keeps track of where the ''next'' byte should come from.

Variable advances, data doesn't move.

[Tesla DeLorean]

Posted on May 13, 2015 at 20:09

to be migrated, sourceId: 13895:74F499D6-C293-4561-BFB5-4F1489999957

[jeffrey23]

Posted on September 16, 2015 at 16:04

Dear All,

How I can retarget scanf function to software buffer in order to send data in interrupt handler?

[Tesla DeLorean]

Posted on September 16, 2015 at 17:33

Keil allows you to provide a replacement for int fgetc(FILE *f)

int fgetc(FILE *f)
{
uint16_t ch;
while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
ch = USART_ReceiveData(USART1);
return((int)ch);
}

Alternatively, make a buffer, and use sscanf() ?

[alla_venugopal]

Posted on November 26, 2015 at 13:48

Hi clive1,

I am new to STM32F0 contoller. I need to communicate 2 STM32F0 controllers using RS485 protocol.Could you please share the code.

Thanks

[Tesla DeLorean]

Posted on November 26, 2015 at 15:06

Not really a combination I have an example for, you'll need to review the peripheral library examples, source, and reference docs, related to 1-wire USART operation.