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Merge branch 'feature/s31_lp_spi' into 'master'

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feat(ulp/lp_spi): bring up LP SPI on ESP32-S31

Closes IDF-14736

See merge request espressif/esp-idf!47833
This commit is contained in:
Marius Vikhammer
2026-04-28 13:34:40 +08:00
parent 0c39c3ad2d defe1cde71
commit fc3b1c827b
13 changed files with 880 additions and 381 deletions
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examples/system/ulp/lp_core/lp_spi/README.md
+2 -1
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@@ -1,7 +1,7 @@
| Supported Targets | ESP32-P4 |
| ----------------- | -------- |
# LP I2C Example
# LP SPI Example
(See the README.md file in the upper level 'examples' directory for more information about examples.)
@@ -22,6 +22,7 @@ To run this example, you should have an ESP based development board that support
| | SDI(MISO) | SDO(MOSI) | SCK | CSB (CS) |
| ----------------------- | ----------| ----------| ----- | -------- |
| ESP32-P4 LP SPI Master | GPIO6 | GPIO7 | GPIO8 | GPIO4 |
| ESP32-S31 LP SPI Master | GPIO6 | GPIO7 | GPIO3 | GPIO4 |
### Build and Flash
examples/system/ulp/lp_core/lp_spi/main/lp_spi_main.c
+7 -3
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2024-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -17,7 +17,11 @@ extern const uint8_t lp_core_main_bin_end[] asm("_binary_lp_core_main_bin_end"
#define LP_SPI_MOSI_PIN 7
#define LP_SPI_MISO_PIN 6
#if CONFIG_IDF_TARGET_ESP32S31
#define LP_SPI_SCLK_PIN 3
#else
#define LP_SPI_SCLK_PIN 8
#endif
#define LP_SPI_CS_PIN 4
#define LP_CORE_WAKEUP_PERIOD_US 1*1000*1000
@@ -58,7 +62,7 @@ static void lp_spi_init(void)
/* Base LP SPI device settings */
lp_spi_device_config_t device = {
.cs_io_num = LP_SPI_CS_PIN,
.clock_speed_hz = 10 * 1000, // 10 MHz
.clock_speed_hz = 10 * 1000, // 10 kHz
.duty_cycle = 128, // 50% duty cycle
};
@@ -79,7 +83,7 @@ void app_main(void)
vTaskDelay(pdMS_TO_TICKS(1000));
uint32_t causes = esp_sleep_get_wakeup_causes();
if (esp_sleep_get_wakeup_causes() & BIT(ESP_SLEEP_WAKEUP_ULP)) {
if (causes & BIT(ESP_SLEEP_WAKEUP_ULP)) {
printf("LP core woke up the main CPU\n");
printf("Temperature %.2f degree celsius, humidity %.2f%%RH\n", ulp_temperature / 100.0, ulp_humidity / 1024.0);
} else {