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esp32/machine_uart: Allow limited configuration of REPL UART.

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Some applications may want to adjust the hard coded 115200 REPL buadrate,
and this commit allows it to be changed dynamically via machine.UART(0).
This commit is contained in:
Andrew Leech
2022-02-24 14:30:50 +11:00
committed by Damien George
parent 2cc9232781
commit 919e586e46
3 changed files with 22 additions and 20 deletions
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26
ports/esp32/machine_uart.c
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@@ -35,6 +35,7 @@
#include "py/stream.h"
#include "py/mperrno.h"
#include "modmachine.h"
#include "uart.h"
#if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(4, 1, 0)
#define UART_INV_TX UART_INVERSE_TXD
@@ -151,6 +152,10 @@ STATIC void machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args, co
if (args[ARG_txbuf].u_int >= 0 || args[ARG_rxbuf].u_int >= 0) {
// must reinitialise driver to change the tx/rx buffer size
if (self->uart_num == MICROPY_HW_UART_REPL) {
mp_raise_ValueError(MP_ERROR_TEXT("UART buffer size is fixed"));
}
if (args[ARG_txbuf].u_int >= 0) {
self->txbuf = args[ARG_txbuf].u_int;
}
@@ -291,12 +296,6 @@ STATIC mp_obj_t machine_uart_make_new(const mp_obj_type_t *type, size_t n_args,
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("UART(%d) does not exist"), uart_num);
}
// Attempts to use UART0 from Python has resulted in all sorts of fun errors.
// FIXME: UART0 is disabled for now.
if (uart_num == UART_NUM_0) {
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("UART(%d) is disabled (dedicated to REPL)"), uart_num);
}
// Defaults
uart_config_t uartcfg = {
.baud_rate = 115200,
@@ -338,14 +337,17 @@ STATIC mp_obj_t machine_uart_make_new(const mp_obj_type_t *type, size_t n_args,
#endif
}
// Remove any existing configuration
uart_driver_delete(self->uart_num);
// Only reset the driver if it's not the REPL UART.
if (uart_num != MICROPY_HW_UART_REPL) {
// Remove any existing configuration
uart_driver_delete(self->uart_num);
// init the peripheral
// Setup
uart_param_config(self->uart_num, &uartcfg);
// init the peripheral
// Setup
uart_param_config(self->uart_num, &uartcfg);
uart_driver_install(uart_num, self->rxbuf, self->txbuf, 0, NULL, 0);
uart_driver_install(uart_num, self->rxbuf, self->txbuf, 0, NULL, 0);
}
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);