BufferedSerial queue size problem

Mbed OS Bugs
,
1

Hello, currently I am working on STM32-F746 discovery board which is receiving data from Bluepill over Uart port. The data is transferred properly but if i need to get size of buffer of internal queue it is returning -29. can someone help me to understand why size is not correct.

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image901×454 15.2 KB

2

Hi there,

please be so kind and fill more information.
What a code/method return this value? How often you call that? How often you send data to this target?

BR, Jan

3

receiver side SMT32F746

#include "mbed.h"
#define MAXIMUM_BUFFER_SIZE          32

static DigitalOut led(LED1);

static BufferedSerial pc(USBTX, USBRX);
static BufferedSerial serial_port(TX7, RX7);
Thread buffsize;
void buffsizefunction(){
    while(true){
        printf("size of buffer %d\r\n",  serial_port.size());
        ThisThread::sleep_for(1000);
    }
}
int main()
{
    pc.set_baud(115200);
    pc.set_format(
            /* bits */ 8,
            /* parity */ BufferedSerial::None,
            /* stop bit */ 1
    );
    printf("Hello, Mbed!\n");

    serial_port.set_baud(9600);
    serial_port.set_format(
            /* bits */ 8,
            /* parity */ BufferedSerial::None,
            /* stop bit */ 1
    );

    char buf[MAXIMUM_BUFFER_SIZE] = {0};
    buffsize.start(buffsizefunction);

    while (1) {
        ThisThread::sleep_for(8000);
        if (uint32_t num = serial_port.read(buf, sizeof(buf))) {
            printf("Data: %s\r\n",  buf);
            led = !led;
        }
    }
    return 0;
}

transmiter side BLUEPILL


#include "mbed.h"
#include "dev_trace.h"

static DigitalOut led(LED1);

static UnbufferedSerial serial_port(TX2, RX2);

uint8_t buf[] = "Don't Worry Be Happy.";


int main(void)
{
    // Set desired properties (9600-8-N-1).
    serial_port.baud(9600);
    serial_port.format(
            /* bits */ 8,
            /* parity */ SerialBase::None,
            /* stop bit */ 1
    );
    while(true){
        serial_port.write(&buf, sizeof(buf));
        ThisThread::sleep_for(5000);
    }
}   ```