async_test for test

Dependencies:   mbed-src

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);
}

Committer:
SteveKim
Date:
Mon Jul 13 04:38:28 2015 +0000
Revision:
0:51977f75213d
async_print for test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
SteveKim 0:51977f75213d 1 #include "mbed.h"
SteveKim 0:51977f75213d 2 #include "CBuffer.h"
SteveKim 0:51977f75213d 3 #include <stdarg.h>
SteveKim 0:51977f75213d 4
SteveKim 0:51977f75213d 5 DigitalOut led1(LED1);
SteveKim 0:51977f75213d 6 DigitalOut led4(LED4);
SteveKim 0:51977f75213d 7
SteveKim 0:51977f75213d 8 RawSerial pc(USBTX, USBRX); // tx, rx
SteveKim 0:51977f75213d 9
SteveKim 0:51977f75213d 10 ////////////////////////////////////////////////////////////////////////////////////////////////
SteveKim 0:51977f75213d 11 // mbed Async Debug Print
SteveKim 0:51977f75213d 12 Timeout timer_async_print;
SteveKim 0:51977f75213d 13 CircBuffer<char> buffer_async_print(1024);
SteveKim 0:51977f75213d 14 static char debug_line[64];
SteveKim 0:51977f75213d 15
SteveKim 0:51977f75213d 16 void timerfunction_async_print()
SteveKim 0:51977f75213d 17 {
SteveKim 0:51977f75213d 18 char c=0;
SteveKim 0:51977f75213d 19
SteveKim 0:51977f75213d 20 while ( buffer_async_print.available() ) {
SteveKim 0:51977f75213d 21 buffer_async_print.dequeue(&c);
SteveKim 0:51977f75213d 22 pc.putc(c);
SteveKim 0:51977f75213d 23 }
SteveKim 0:51977f75213d 24 timer_async_print.attach(&timerfunction_async_print, 0.1);
SteveKim 0:51977f75213d 25 }
SteveKim 0:51977f75213d 26
SteveKim 0:51977f75213d 27 void async_print(const char *format, ...)
SteveKim 0:51977f75213d 28 {
SteveKim 0:51977f75213d 29 va_list args;
SteveKim 0:51977f75213d 30
SteveKim 0:51977f75213d 31 va_start(args, format);
SteveKim 0:51977f75213d 32
SteveKim 0:51977f75213d 33 vsnprintf(debug_line, sizeof(debug_line), format, args);
SteveKim 0:51977f75213d 34 int length = strlen(debug_line);
SteveKim 0:51977f75213d 35
SteveKim 0:51977f75213d 36 for (int i=0; i<length; i++)
SteveKim 0:51977f75213d 37 buffer_async_print.queue(debug_line[i]);
SteveKim 0:51977f75213d 38
SteveKim 0:51977f75213d 39 va_end(args);
SteveKim 0:51977f75213d 40 }
SteveKim 0:51977f75213d 41
SteveKim 0:51977f75213d 42 extern void (*p_async_print)(const char *format, ...);
SteveKim 0:51977f75213d 43 ////////////////////////////////////////////////////////////////////////////////////////////////
SteveKim 0:51977f75213d 44
SteveKim 0:51977f75213d 45
SteveKim 0:51977f75213d 46 extern int rx_irq_counter;
SteveKim 0:51977f75213d 47 void pc_recv()
SteveKim 0:51977f75213d 48 {
SteveKim 0:51977f75213d 49 led4 = !led4;
SteveKim 0:51977f75213d 50 while(pc.readable()) {
SteveKim 0:51977f75213d 51 pc.printf("RECV [%c]\r\n", pc.getc());
SteveKim 0:51977f75213d 52 }
SteveKim 0:51977f75213d 53 }
SteveKim 0:51977f75213d 54
SteveKim 0:51977f75213d 55 int main()
SteveKim 0:51977f75213d 56 {
SteveKim 0:51977f75213d 57 for (int i=0; i<20; i++)
SteveKim 0:51977f75213d 58 {
SteveKim 0:51977f75213d 59 led1 = !led1;
SteveKim 0:51977f75213d 60 led4 = !led4;
SteveKim 0:51977f75213d 61 wait(0.05);
SteveKim 0:51977f75213d 62 }
SteveKim 0:51977f75213d 63
SteveKim 0:51977f75213d 64 // Initialize AsyncPrint
SteveKim 0:51977f75213d 65 timer_async_print.attach(&timerfunction_async_print, 0.1);
SteveKim 0:51977f75213d 66 p_async_print = &async_print;
SteveKim 0:51977f75213d 67
SteveKim 0:51977f75213d 68 pc.baud(115200);
SteveKim 0:51977f75213d 69 pc.printf("AsyncPrint Test. \r\n");
SteveKim 0:51977f75213d 70
SteveKim 0:51977f75213d 71 pc.attach(&pc_recv, Serial::RxIrq);
SteveKim 0:51977f75213d 72
SteveKim 0:51977f75213d 73 while(1) {
SteveKim 0:51977f75213d 74 wait(1);
SteveKim 0:51977f75213d 75 }
SteveKim 0:51977f75213d 76 }
SteveKim 0:51977f75213d 77