size_t uart_resize_rx_buffer(uart_t* uart, size_t new_size)
{
if(uart == NULL || !uart->rx_enabled) {
return 0;
}
if(uart->rx_buffer->size == new_size) {
return uart->rx_buffer->size;
}
uint8_t * new_buf = (uint8_t*)malloc(new_size);
if(!new_buf) {
return uart->rx_buffer->size;
}
size_t new_wpos = 0;
ETS_UART_INTR_DISABLE();
while(uart_rx_available(uart) && new_wpos < new_size) {
new_buf[new_wpos++] = uart_read_char(uart);
}
uint8_t * old_buf = uart->rx_buffer->buffer;
uart->rx_buffer->rpos = 0;
uart->rx_buffer->wpos = new_wpos;
uart->rx_buffer->size = new_size;
uart->rx_buffer->buffer = new_buf;
free(old_buf);
ETS_UART_INTR_ENABLE();
return uart->rx_buffer->size;
}
int HardwareSerial::available(void)
{
int result = static_cast<int>(uart_rx_available(_uart));
if (!result) {
optimistic_yield(10000);
}
return result;
}
int uart_peek_char(uart_t* uart)
{
if(uart == NULL || !uart->rx_enabled) {
return -1;
}
if (!uart_rx_available(uart)) {
return -1;
}
return uart->rx_buffer->buffer[uart->rx_buffer->rpos];
}
/* serial1 can not rx data, just tx for debug */
irom int serial_available()
{
uart_t *_uart = uart0;
if(!_uart || !uart_rx_enabled(_uart)) {
return 0;
}
int result = uart_rx_available(_uart);
if (_peek_char != -1) {
result += 1;
}
if (!result) {
optimistic_yield(10000);
}
return result;
}
