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fix(uart): lp uart rx iomux pin was not working as expected

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Introduced in 8818157e42
The workaround in the commit routes the signal to LP GPIO matrix first.
When uses LP IOMUX pin as UART RX, the signal did not bypass the matrix,
which caused the issue.

This commit adds rtc_gpio_iomux_input and rtc_gpio_iomux_output APIs
to align with existing GPIO driver APIs.
This commit is contained in:
Song Ruo Jing
2026-04-09 17:07:01 +08:00
parent 57ad8c89ab
commit 9c2a8281c1
8 changed files with 138 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files
components/esp_hal_gpio/esp32p4/include/hal/rtc_io_ll.h
+26
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@@ -73,11 +73,37 @@ static inline void rtcio_ll_matrix_out(int rtcio_num, uint32_t signal_idx, bool
reg.func_out_sel = signal_idx;
reg.out_inv_sel = out_inv;
reg.oe_inv_sel = oen_inv;
reg.oe_sel = 0; // output enable signal controlled by peripheral
LP_GPIO.func_out_sel_cfg[rtcio_num].val = reg.val;
HAL_FORCE_MODIFY_U32_REG_FIELD(LP_GPIO.enable_w1ts, reg_gpio_enable_data_w1ts, BIT(rtcio_num));
}
/**
* @brief Configure peripheral signal input whether to bypass LP_GPIO matrix.
*
* @param signal_idx LP peripheral signal index.
* @param from_gpio_matrix True if not to bypass LP_GPIO matrix, otherwise False.
*/
static inline void rtcio_ll_set_input_signal_from(uint32_t signal_idx, bool from_gpio_matrix)
{
LP_GPIO.func_in_sel_cfg[signal_idx].sig_in_sel = from_gpio_matrix;
}
/**
* @brief Configure the source of output enable signal for the pad (only takes effect if func sel is selected to be LP_GPIO).
*
* @param rtcio_num The index of rtcio. 0 ~ MAX(rtcio).
* @param ctrl_by_periph True if use output enable signal from peripheral, false if force the output enable signal to be sourced from bit n of LP_GPIO_ENABLE_REG
* @param oen_inv True if the output enable needs to be inverted, otherwise False.
*/
__attribute__((always_inline))
static inline void rtcio_ll_set_output_enable_ctrl(int rtcio_num, bool ctrl_by_periph, bool oen_inv)
{
LP_GPIO.func_out_sel_cfg[rtcio_num].oe_inv_sel = oen_inv; // control valid only when using lp gpio matrix to route signal to the LP IO
LP_GPIO.func_out_sel_cfg[rtcio_num].oe_sel = !ctrl_by_periph;
}
/**
* @brief Select a RTC IOMUX function for the RTC IO
*