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Hello, I have STM32F103 with three active USART + one SWO port. I need to single UART send different data, ideally using printf, but I do not know how to redirect flow from print to a specific USART you do? I would welcome an application example with more UART communication.
The second query. Looking for example of how to redirect printf to SWO, for STM32F103 too.
Use fprintf() and manage them at the fputc() level. You could override the FILE handle with some other constants if it makes life easier.
http://www.keil.com/forum/58917/
I thing all function from printf famili need implement lowlwvel function fputc etc.
Retargeting printf()
#include <stdio.h> struct __FILE { int handle; /* Whatever you require here. If the only file you are using is */ /* standard output using printf() for debugging, no file handling */ /* is required. */ }; /* FILE is typedef’d in stdio.h. */ FILE __stdout; int fputc(int ch, FILE *f) { /* Your implementation of fputc(). */ return ch; } int ferror(FILE *f) { /* Your implementation of ferror(). */ return 0; } void test(void) { printf("Hello world\n"); }
more precise reimplemrntation fputc for UART
int fputc(int ch, FILE *f) { /* Place your implementation of fputc here */ /* e.g. write a character to the USART1 and Loop until the end of transmission */ HAL_UART_Transmit(&UartHandle, (uint8_t *)&ch, 1, 0xFFFF); return ch; }