async_test for test
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This is about asynchronous uart output.
When I need to debug my software in a ISR or a task(thread), I worried that printf() might cause some abnormal result.
So, I made my uart output function like printf().
Initialize async_print¶
title
void timerfunction_async_print() { char c=0; while ( buffer_async_print.available() ) { buffer_async_print.dequeue(&c); pc.putc(c); } timer_async_print.attach(&timerfunction_async_print, 0.1); } void async_print(const char *format, ...) { va_list args; va_start(args, format); vsnprintf(debug_line, sizeof(debug_line), format, args); int length = strlen(debug_line); for (int i=0; i<length; i++) buffer_async_print.queue(debug_line[i]); va_end(args); } int main() { ..................................................... // Initialize AsyncPrint timer_async_print.attach(&timerfunction_async_print, 0.1); p_async_print = &async_print; ..................................................... }
Implementation async_print¶
void (*p_async_print)(const char *format, ...); void UART0_Handler() { p_async_print("IRQ : UART_IT_FLAG_RXI \r\n"); uart_irq(UART_0, 0); }