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esp32/machine_uart: Implement uart.flush() and uart.txdone().

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uart.flush()

flush() will wait until all characters have been sent.To
avoid a permanent lock, a timeout applies depending on the
size of txbuf and the baud rate.

ret = uart.txdone()

ret is True if no transfer is in progress.
ret is False otherwise.
This commit is contained in:
robert-hh 2022-08-26 15:21:48 +02:00 committed by Damien George
parent 2488311dc2
commit 5466f1b0ea
1 changed files with 25 additions and 0 deletions
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25
ports/esp32/machine_uart.c
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@ -417,15 +417,28 @@ STATIC mp_obj_t machine_uart_sendbreak(mp_obj_t self_in) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_uart_sendbreak_obj, machine_uart_sendbreak);
STATIC mp_obj_t machine_uart_txdone(mp_obj_t self_in) {
machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
if (uart_wait_tx_done(self->uart_num, 0) == ESP_OK) {
return mp_const_true;
} else {
return mp_const_false;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_uart_txdone_obj, machine_uart_txdone);
STATIC const mp_rom_map_elem_t machine_uart_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&machine_uart_init_obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&machine_uart_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_any), MP_ROM_PTR(&machine_uart_any_obj) },
{ MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&mp_stream_flush_obj) },
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
{ MP_ROM_QSTR(MP_QSTR_sendbreak), MP_ROM_PTR(&machine_uart_sendbreak_obj) },
{ MP_ROM_QSTR(MP_QSTR_txdone), MP_ROM_PTR(&machine_uart_txdone_obj) },
{ MP_ROM_QSTR(MP_QSTR_INV_TX), MP_ROM_INT(UART_INV_TX) },
{ MP_ROM_QSTR(MP_QSTR_INV_RX), MP_ROM_INT(UART_INV_RX) },
@ -491,6 +504,18 @@ STATIC mp_uint_t machine_uart_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr
if ((flags & MP_STREAM_POLL_WR) && 1) { // FIXME: uart_tx_any_room(self->uart_num)
ret |= MP_STREAM_POLL_WR;
}
} else if (request == MP_STREAM_FLUSH) {
// The timeout is estimated using the buffer size and the baudrate.
// Take the worst case assumptions at 13 bit symbol size times 2.
uint32_t baudrate;
uart_get_baudrate(self->uart_num, &baudrate);
uint32_t timeout = (3 + self->txbuf) * 13000 * 2 / baudrate;
if (uart_wait_tx_done(self->uart_num, timeout) == ESP_OK) {
ret = 0;
} else {
*errcode = MP_ETIMEDOUT;
ret = MP_STREAM_ERROR;
}
} else {
*errcode = MP_EINVAL;
ret = MP_STREAM_ERROR;