9 years, 1 month ago.

write and read is inaccessible.

I want to have PC to MBED async communication over USB port. I following pretty much code from this repo

Repository: Serial-LowPower-Demo

. Here is the code I have

#include "mbed.h"

DigitalOut myled1(LED1);
DigitalOut myled2(LED2);
Serial pc(USBTX, USBRX);
uint8_t rxBuffer[5];
bool on = false;

event_callback_t eSerialCb;
void serialCb(int event){
    unsigned char i;
    
    if (event & SERIAL_EVENT_RX_CHARACTER_MATCH){
        myled2 = on ? 0 : 1;
        on = !on;
        for (i = 0; i < 5; i++){
            if (rxBuffer[i] == '$') { break; }
        }
    } else if (event & SERIAL_EVENT_RX_COMPLETE) {
        i = 5 - 1;
    } else {
        rxBuffer[0] = 'E';
        rxBuffer[1] = 'R';
        rxBuffer[2] = 'R';
        rxBuffer[3] = '!';
        i = 3;
    }
    
    pc.write(rxBuffer, i+1, 0, 0);
    
    pc.read(rxBuffer, 5, eSerialCb, SERIAL_EVENT_RX_ALL, '$');
}

int main() {
    eSerialCb.attach(serialCb);
    
    pc.baud(115200);
    pc.printf("Send '$'.\r\n");
    pc.read(rxBuffer, 5, eSerialCb, SERIAL_EVENT_RX_ALL, '$');
    
    while(1) {
        myled1 = 1;
        wait(0.2);
        myled1 = 0;
        wait(0.2);
    }
}

However get following errors

- Error: Function "mbed::Stream::read" (declared at <a href="#" onmousedown="mbed_doc_goto('/mbed_blinky_async//extras/mbed_9296ab0bfc11/Stream.h', '46'); return false;">/extras/mbed_9296ab0bfc11/Stream.h:46</a>) is inaccessible in "main.cpp", Line: 40, Col: 9

- Error: Function "mbed::Stream::write" (declared at <a href="#" onmousedown="mbed_doc_goto('/mbed_blinky_async//extras/mbed_9296ab0bfc11/Stream.h', '45'); return false;">/extras/mbed_9296ab0bfc11/Stream.h:45</a>) is inaccessible in "main.cpp", Line: 30, Col: 9

I also get other error saying too many arguments for read and write. Furthermore, the "live documentation" in the window only shows read, and write function for other port types i.e. DigitalOut, PwnOut, AnalogOut etc.

I don't understand why these are happening, and why it won't work. Is there a different way to have async communication between PC and MBED over USB port? The board I'm using is LPC1768.