Warren Gay:
...
> inline static int
> usart_tx_ready(uint32_t usart) {
> return (USART_SR(usart) & USART_SR_TXE) != 0;
> }
>
> static void
> uart_task(void *args) {
> char ch;
>
> for (;;) {
> /* Receive char to be TX */
> if ( xQueueReceive(uart_txq,&ch,500) == pdPASS ) {
> while ( !usart_tx_ready(USART1) )
> taskYIELD(); /* Yield CPU to ready tasks */
> usart_send_blocking(USART1,ch); /* blocking call */
> }
> }
> }
This is how I'm doing it:
http://aspodata.se/git/openhw/libarm/tty_fd_run.c
...
> So it would be a welcome addition to the libopencm3 library to provide
> routines:
>
> int usart_send_ready(uint32_t usart);
> int usart_recv_ready(uint32_t usart);
Why not http://aspodata.se/git/openhw/libarm/stm32/tty_ll.h
I use the above as in:
http://aspodata.se/git/openhw/regulator/regulator.c
it is strictly polled, even gives me simple command line editing.
Regards,
/Karl Hammar
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