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cpu/esp32: improve UART initialization

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The TX line is set and temporarily configured as a pull-up open-drain output before configuring it as a push-pull output to avoid a several msec long LOW pulse resulting in some garbage.
This commit is contained in:
Gunar Schorcht 2023-01-14 13:55:03 +01:00
parent fe21e82079
commit 3085b92e8f
1 changed files with 8 additions and 5 deletions
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13
cpu/esp_common/periph/uart.c
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@ -179,11 +179,14 @@ int uart_init(uart_t uart, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
gpio_set_pin_usage(uart_config[uart].rxd, _GPIO);
}
/* try to initialize the pins as GPIOs first */
if ((uart_config[uart].txd != GPIO_UNDEF &&
gpio_init(uart_config[uart].txd, GPIO_OUT)) ||
(uart_config[uart].rxd != GPIO_UNDEF &&
gpio_init(uart_config[uart].rxd, GPIO_IN_PU))) {
/* Try to initialize the pins where the TX line is set and temporarily
* configured as a pull-up open-drain output before configuring it as
* a push-pull output to avoid a several msec long LOW pulse resulting
* in some garbage */
gpio_set(uart_config[uart].txd);
if (gpio_init(uart_config[uart].txd, GPIO_OD_PU) ||
gpio_init(uart_config[uart].txd, GPIO_OUT) ||
gpio_init(uart_config[uart].rxd, GPIO_IN_PU)) {
return -1;
}