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fix(lp_core): skip LP UART RTS/CTS pin setup when flow control is disabled

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lp_core_uart_set_pin() unconditionally configured the RTS and CTS GPIO
pins even when flow control was disabled. Only configure the RTS pin
when UART_HW_FLOWCTRL_RTS is set, and the CTS pin when
UART_HW_FLOWCTRL_CTS is set.
This commit is contained in:
Sudeep Mohanty
2026-07-27 15:35:30 +02:00
parent fd466db9f6
commit ee9d199d7f
1 changed files with 7 additions and 4 deletions
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components/ulp/lp_core/lp_core_uart.c
+7 -4
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@@ -154,10 +154,13 @@ static esp_err_t lp_core_uart_set_pin(const lp_core_uart_cfg_t *cfg)
ret = lp_uart_config_io(cfg->uart_pin_cfg.tx_io_num, RTC_GPIO_MODE_OUTPUT_ONLY, SOC_UART_TX_PIN_IDX);
/* Configure Rx Pin */
ret = lp_uart_config_io(cfg->uart_pin_cfg.rx_io_num, RTC_GPIO_MODE_INPUT_ONLY, SOC_UART_RX_PIN_IDX);
/* Configure RTS Pin */
ret = lp_uart_config_io(cfg->uart_pin_cfg.rts_io_num, RTC_GPIO_MODE_OUTPUT_ONLY, SOC_UART_RTS_PIN_IDX);
/* Configure CTS Pin */
ret = lp_uart_config_io(cfg->uart_pin_cfg.cts_io_num, RTC_GPIO_MODE_INPUT_ONLY, SOC_UART_CTS_PIN_IDX);
/* Configure RTS/CTS only when hardware flow control is enabled */
if (cfg->uart_proto_cfg.flow_ctrl & UART_HW_FLOWCTRL_RTS) {
ret = lp_uart_config_io(cfg->uart_pin_cfg.rts_io_num, RTC_GPIO_MODE_OUTPUT_ONLY, SOC_UART_RTS_PIN_IDX);
}
if (cfg->uart_proto_cfg.flow_ctrl & UART_HW_FLOWCTRL_CTS) {
ret = lp_uart_config_io(cfg->uart_pin_cfg.cts_io_num, RTC_GPIO_MODE_INPUT_ONLY, SOC_UART_CTS_PIN_IDX);
}
return ret;
}