Exemple #1
0
int uart_read(char *c, int rsize)
{
    struct uart_token token;

    token.cur_bytes = 0;
    token.req_bytes = rsize;
    token.buf = c;
    if(ps_cdev_read(&serial_device, token.buf, token.req_bytes, &read_callback, &token) < 0){
        printf("Error reading from UART\n");
        return -1;
    }
    read_sem_wait();

    return token.cur_bytes;
}
Exemple #2
0
static void
read_callback(ps_chardevice_t* device, enum chardev_status stat,
              size_t bytes_transfered, void* token){
    struct uart_token* t;
    t = (struct uart_token*)token;
    /* We might get a short read due to a timeout. */
    t->cur_bytes += bytes_transfered;
    t->buf += bytes_transfered;
    if(t->cur_bytes < t->req_bytes){
        int ret;
        ret = ps_cdev_read(device, t->buf, t->req_bytes - t->cur_bytes,
                           &read_callback, token);
        if(ret < 0){
            printf("Error reading from UART\n");
            read_sem_post();
        }
    }else{
        read_sem_post();
    }
}