Merge branch 'test/add_i3c_multi_test' into 'master'

test(i3c_master): Add multi test for i3c master, adding i3c slave ll support.

Closes IDFCI-3058

See merge request espressif/esp-idf!41049

components/esp_driver_i3c/i3c_master.c

@@ -332,14 +332,14 @@ static esp_err_t i3c_pins_config(const i3c_master_bus_config_t *bus_config)
 {
     esp_err_t ret = ESP_OK;
     // SDA pin configurations
-    ESP_RETURN_ON_ERROR(gpio_set_level(bus_config->sda_io_num, 1), TAG, "i2c sda pin set level failed");
+    ESP_RETURN_ON_ERROR(gpio_set_level(bus_config->sda_io_num, 1), TAG, "i3c sda pin set level failed");
     gpio_input_enable(bus_config->sda_io_num);
     gpio_func_sel(bus_config->sda_io_num, PIN_FUNC_GPIO);
     gpio_matrix_output(bus_config->sda_io_num, i3c_master_periph_signal->sda_out_sig, 0, 0);
     gpio_matrix_input(bus_config->sda_io_num, i3c_master_periph_signal->sda_in_sig, 0);
 
     // SCL pin configurations
-    ESP_RETURN_ON_ERROR(gpio_set_level(bus_config->scl_io_num, 1), TAG, "i2c scl pin set level failed");
+    ESP_RETURN_ON_ERROR(gpio_set_level(bus_config->scl_io_num, 1), TAG, "i3c scl pin set level failed");
     gpio_input_enable(bus_config->scl_io_num);
     gpio_func_sel(bus_config->scl_io_num, PIN_FUNC_GPIO);
     gpio_matrix_output(bus_config->scl_io_num, i3c_master_periph_signal->scl_out_sig, 0, 0);
@@ -445,7 +445,6 @@ static esp_err_t do_dma_transaction_handler(i3c_master_bus_handle_t bus_handle,
 {
     esp_err_t err = ESP_OK;
     bus_handle->cur_trans = trans;
-    printf("here, do dma\n");
 
     portENTER_CRITICAL_SAFE(&bus_handle->spinlock);
     if (trans->scl_freq_hz > 400 * 1000) {
@@ -509,7 +508,6 @@ static esp_err_t do_dma_transaction_handler(i3c_master_bus_handle_t bus_handle,
     portENTER_CRITICAL_SAFE(&bus_handle->spinlock);
     i3c_master_ll_start_transaction(bus_handle->hal.dev);
     portEXIT_CRITICAL_SAFE(&bus_handle->spinlock);
-    printf("here, start transaction\n");
     return ESP_OK;
 }
 

components/esp_driver_i3c/test_apps/i3c_test_apps/CMakeLists.txt

@@ -27,5 +27,5 @@ endif()
 
 message(STATUS "Checking i3c registers are not read-write by half-word")
 include($ENV{IDF_PATH}/tools/ci/check_register_rw_half_word.cmake)
-check_register_rw_half_word(SOC_MODULES "i3c_mst" "i3c_mst_mem" "hp_sys_clkrst" "lpperi" "lp_clkrst"
+check_register_rw_half_word(SOC_MODULES "i3c_mst" "i3c_mst_mem" "hp_sys_clkrst" "i3c_slv"
-                            HAL_MODULES "i3c_master")
+                            HAL_MODULES "i3c_master" "i3c_slave")

components/esp_driver_i3c/test_apps/i3c_test_apps/main/CMakeLists.txt

@@ -1,7 +1,8 @@
 set(srcs "test_app_main.c"
-         "test_i3c_master_common.c"
+         "test_i3c_master_common.cpp"
+         "test_i3c_multi.cpp"
     )
 
 idf_component_register(SRCS ${srcs}
-                       PRIV_REQUIRES unity test_utils esp_driver_i3c
+                       PRIV_REQUIRES unity test_utils esp_driver_i3c esp_driver_uart esp_driver_gpio
                        WHOLE_ARCHIVE)

components/esp_driver_i3c/test_apps/i3c_test_apps/main/test_app_main.c

@@ -10,7 +10,7 @@
 #include "esp_heap_caps.h"
 #include "sdkconfig.h"
 
-#define LEAKS (100)
+#define LEAKS (150)
 
 void setUp(void)
 {

components/esp_driver_i3c/test_apps/i3c_test_apps/main/test_i3c_board.h

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include "sdkconfig.h"
+#include "soc/gpio_num.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define I3C_SLAVE_SCL_IO     GPIO_NUM_32    /*!<gpio number for I3C slave clock  */
+#define I3C_SLAVE_SDA_IO     GPIO_NUM_33    /*!<gpio number for I3C slave data */
+#define I3C_MASTER_SCL_IO    GPIO_NUM_32     /*!< gpio number for I3C master clock */
+#define I3C_MASTER_SDA_IO    GPIO_NUM_33     /*!< gpio number for I3C master data  */
+
+#define TEST_STATIC_ADDRESS  0x6a
+#define TEST_DYNAMIC_ADDRESS 0x06
+
+#define DATA_LENGTH     16
+
+#ifdef __cplusplus
+}
+#endif

components/esp_driver_i3c/test_apps/i3c_test_apps/main/test_i3c_master_common.cpp

@@ -14,16 +14,21 @@
 #include "freertos/FreeRTOS.h"
 #include "esp_log.h"
 #include "test_utils.h"
+#include "test_i3c_board.h"
+#include "driver/uart.h"
+#include "driver/gpio.h"
 
 static const char TAG[] = "test-i3c";
 
 TEST_CASE("I3C bus install-uninstall test", "[i3c]")
 {
     i3c_master_bus_config_t i3c_bus_config = {
+        .sda_io_num = I3C_MASTER_SDA_IO,
+        .scl_io_num = I3C_MASTER_SCL_IO,
         .clock_source = I3C_MASTER_CLK_SRC_DEFAULT,
-        .scl_io_num = 5,
-        .sda_io_num = 6,
         .trans_queue_depth = 30,
+        .intr_priority = 0,
+        .flags = {0}
     };
     i3c_master_bus_handle_t bus_handle;
 
@@ -42,10 +47,12 @@ TEST_CASE("I3C bus install-uninstall test", "[i3c]")
 TEST_CASE("I3C driver memory leaking check", "[i3c]")
 {
     i3c_master_bus_config_t i3c_bus_config = {
+        .sda_io_num = I3C_MASTER_SDA_IO,
+        .scl_io_num = I3C_MASTER_SCL_IO,
         .clock_source = I3C_MASTER_CLK_SRC_DEFAULT,
-        .scl_io_num = 5,
-        .sda_io_num = 6,
         .trans_queue_depth = 30,
+        .intr_priority = 0,
+        .flags = {0}
     };
     i3c_master_bus_handle_t bus_handle;
 
@@ -62,33 +69,34 @@ TEST_CASE("I3C driver memory leaking check", "[i3c]")
 TEST_CASE("I3C device add & remove check", "[i3c]")
 {
     i3c_master_bus_config_t i2c_mst_config_1 = {
+        .sda_io_num = I3C_MASTER_SDA_IO,
+        .scl_io_num = I3C_MASTER_SCL_IO,
         .clock_source = I3C_MASTER_CLK_SRC_DEFAULT,
-        .scl_io_num = 5,
-        .sda_io_num = 6,
-        .flags.enable_async_trans = true,
         .trans_queue_depth = 30,
+        .intr_priority = 0,
+        .flags = {.enable_async_trans = 1}
     };
     i3c_master_bus_handle_t bus_handle;
 
     TEST_ESP_OK(i3c_new_master_bus(&i2c_mst_config_1, &bus_handle));
 
     i3c_device_i2c_config_t dev_cfg_1 = {
-        .scl_freq_hz = 100 * 1000,
         .device_address = 0x10,
+        .scl_freq_hz = 100 * 1000
     };
     i3c_master_i2c_device_handle_t dev_1;
     TEST_ESP_OK(i3c_master_bus_add_i2c_device(bus_handle, &dev_cfg_1, &dev_1));
 
     i3c_device_i2c_config_t dev_cfg_2 = {
-        .scl_freq_hz = 100 * 1000,
         .device_address = 0x20,
+        .scl_freq_hz = 100 * 1000
     };
     i3c_master_i2c_device_handle_t dev_2;
     TEST_ESP_OK(i3c_master_bus_add_i2c_device(bus_handle, &dev_cfg_2, &dev_2));
 
     i3c_device_i2c_config_t dev_cfg_3 = {
-        .scl_freq_hz = 100 * 1000,
         .device_address = 0x30,
+        .scl_freq_hz = 100 * 1000
     };
     i3c_master_i2c_device_handle_t dev_3;
     TEST_ESP_OK(i3c_master_bus_add_i2c_device(bus_handle, &dev_cfg_3, &dev_3));
@@ -100,3 +108,49 @@ TEST_CASE("I3C device add & remove check", "[i3c]")
     TEST_ESP_OK(i3c_master_bus_rm_i2c_device(dev_3));
     TEST_ESP_OK(i3c_del_master_bus(bus_handle));
 }
+
+TEST_CASE("I3C master clock frequency test", "[i3c]")
+{
+    uint8_t data_wr[500] = { 0 };
+
+    i3c_master_bus_config_t i3c_mst_config = {
+        .sda_io_num = I3C_MASTER_SDA_IO,
+        .scl_io_num = I3C_MASTER_SCL_IO,
+        .clock_source = I3C_MASTER_CLK_SRC_DEFAULT,
+        .trans_queue_depth = 1,
+        .intr_priority = 0,
+        .flags = {0}
+    };
+    i3c_master_bus_handle_t bus_handle;
+    gpio_pullup_en(I3C_MASTER_SCL_IO);
+    gpio_pullup_en(I3C_MASTER_SDA_IO);
+
+    TEST_ESP_OK(i3c_new_master_bus(&i3c_mst_config, &bus_handle));
+
+    i3c_device_i2c_config_t dev_cfg_1 = {
+        .device_address = TEST_STATIC_ADDRESS,
+        .scl_freq_hz = 400 * 1000
+    };
+    i3c_master_i2c_device_handle_t dev_1;
+    TEST_ESP_OK(i3c_master_bus_add_i2c_device(bus_handle, &dev_cfg_1, &dev_1));
+
+    uart_bitrate_detect_config_t conf = {
+        .rx_io_num = I3C_MASTER_SCL_IO,
+        .source_clk = UART_SCLK_DEFAULT,
+    };
+    uart_bitrate_res_t res = {};
+    uart_detect_bitrate_start(UART_NUM_1, &conf);
+
+    i3c_master_i2c_device_transmit(dev_1, data_wr, 50, -1);
+
+    vTaskDelay(pdMS_TO_TICKS(50));
+    uart_detect_bitrate_stop(UART_NUM_1, true, &res);
+
+    int freq_hz = res.clk_freq_hz / res.pos_period;
+    printf("The tested I3C SCL frequency(fm) is %d\n", freq_hz);
+    TEST_ASSERT_INT_WITHIN(500, 400000, freq_hz);
+
+    TEST_ESP_OK(i3c_master_bus_rm_i2c_device(dev_1));
+
+    TEST_ESP_OK(i3c_del_master_bus(bus_handle));
+}

components/esp_driver_i3c/test_apps/i3c_test_apps/main/test_i3c_multi.cpp

@@ -0,0 +1,247 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include "sdkconfig.h"
+#include "unity.h"
+#include "esp_err.h"
+#include "soc/clk_tree_defs.h"
+#include "esp_private/periph_ctrl.h"
+#include "driver/i3c_master.h"
+#include "driver/i3c_master_i2c.h"
+#include "hal/i3c_slave_ll.h"
+#include "esp_log.h"
+#include "test_utils.h"
+#include "test_i3c_board.h"
+#include "esp_private/gpio.h"
+#include "driver/gpio.h"
+#include "esp_heap_caps.h"
+#include "soc/gpio_sig_map.h"
+#include "soc/io_mux_reg.h"
+#include "soc/i3c_slv_struct.h"
+#include "soc/i3c_slv_reg.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+static const char TAG[] = "test-i3c";
+
+static esp_err_t i3c_slave_pins_config(void)
+{
+    esp_err_t ret = ESP_OK;
+    // SDA pin configurations
+    gpio_input_enable(I3C_SLAVE_SDA_IO);
+    gpio_func_sel(I3C_SLAVE_SDA_IO, PIN_FUNC_GPIO);
+    gpio_matrix_output(I3C_SLAVE_SDA_IO, I3C_SLV_SDA_PAD_OUT_IDX, 0, 0);
+    gpio_matrix_input(I3C_SLAVE_SDA_IO, I3C_SLV_SDA_PAD_IN_IDX, 0);
+
+    // SCL pin configurations
+    gpio_input_enable(I3C_SLAVE_SCL_IO);
+    gpio_func_sel(I3C_SLAVE_SCL_IO, PIN_FUNC_GPIO);
+    gpio_matrix_output(I3C_SLAVE_SCL_IO, I3C_SLV_SCL_PAD_OUT_IDX, 0, 0);
+    gpio_matrix_input(I3C_SLAVE_SCL_IO, I3C_SLV_SCL_PAD_IN_IDX, 0);
+    return ret;
+}
+
+static void i3c_slave_init(void)
+{
+    PERIPH_RCC_ATOMIC() {
+        i3c_slave_ll_enable_bus_clock(&I3C_SLV, true);
+        i3c_slave_ll_reset_register(&I3C_SLV);
+    }
+
+    i3c_slave_pins_config();
+    i3c_slave_ll_config_static_address(&I3C_SLV, TEST_STATIC_ADDRESS);
+    i3c_slave_ll_enable_intr_mask(&I3C_SLV, I3C_SLAVE_LL_EVENT_INTR);
+
+    i3c_slave_ll_unlock_register(&I3C_SLV, true);
+    i3c_slave_ll_set_transmit_fifo_threshold(&I3C_SLV, 1);
+    i3c_slave_ll_set_receive_fifo_threshold(&I3C_SLV, 1);
+}
+
+static void i3c_i2c_slave_read_test(void)
+{
+    unity_wait_for_signal("i2c master init first");
+
+    uint8_t *temp_data = (uint8_t*)heap_caps_malloc(DATA_LENGTH, MALLOC_CAP_DEFAULT);
+    assert(temp_data);
+
+    i3c_slave_init();
+
+    unity_send_signal("i2c slave init finish");
+
+    unity_wait_for_signal("master write");
+
+    i3c_slave_ll_read_data(&I3C_SLV, temp_data, DATA_LENGTH);
+
+    ESP_LOG_BUFFER_HEX(TAG, temp_data, DATA_LENGTH);
+
+    for (int i = 0; i < DATA_LENGTH; i++) {
+        TEST_ASSERT(temp_data[i] == i);
+    }
+
+    unity_send_signal("ready to delete");
+    free(temp_data);
+}
+
+static void i3c_i2c_master_write_test(void)
+{
+    uint8_t data_wr[DATA_LENGTH] = { 0 };
+    int i;
+
+    i3c_master_bus_config_t i3c_mst_config = {
+        .sda_io_num = I3C_MASTER_SDA_IO,
+        .scl_io_num = I3C_MASTER_SCL_IO,
+        .clock_source = I3C_MASTER_CLK_SRC_DEFAULT,
+        .trans_queue_depth = 1,
+        .intr_priority = 0,
+        .flags = {0}
+    };
+    i3c_master_bus_handle_t bus_handle;
+    gpio_pullup_en(I3C_MASTER_SCL_IO);
+    gpio_pullup_en(I3C_MASTER_SDA_IO);
+
+    TEST_ESP_OK(i3c_new_master_bus(&i3c_mst_config, &bus_handle));
+
+    i3c_device_i2c_config_t dev_cfg = {
+        .device_address = TEST_STATIC_ADDRESS,
+        .scl_freq_hz = 100 * 1000
+    };
+    i3c_master_i2c_device_handle_t dev;
+    TEST_ESP_OK(i3c_master_bus_add_i2c_device(bus_handle, &dev_cfg, &dev));
+
+    unity_send_signal("i2c master init first");
+
+    unity_wait_for_signal("i2c slave init finish");
+
+    unity_send_signal("master write");
+    for (i = 0; i < DATA_LENGTH; i++) {
+        data_wr[i] = i;
+    }
+
+    ESP_LOG_BUFFER_HEX(TAG, data_wr, i);
+
+    i3c_master_i2c_device_transmit(dev, data_wr, DATA_LENGTH, -1);
+
+    unity_wait_for_signal("ready to delete");
+
+    TEST_ESP_OK(i3c_master_bus_rm_i2c_device(dev));
+    TEST_ESP_OK(i3c_del_master_bus(bus_handle));
+}
+
+TEST_CASE_MULTIPLE_DEVICES("I3C-I2C master write slave test in fifo mode", "[i3c][test_env=generic_multi_device][timeout=150]", i3c_i2c_master_write_test, i3c_i2c_slave_read_test);
+
+static void i3c_i2c_master_read_slave_test(void)
+{
+    uint8_t data_rd[DATA_LENGTH] = {0};
+    i3c_master_bus_config_t i3c_mst_config = {
+        .sda_io_num = I3C_MASTER_SDA_IO,
+        .scl_io_num = I3C_MASTER_SCL_IO,
+        .clock_source = I3C_MASTER_CLK_SRC_DEFAULT,
+        .trans_queue_depth = 1,
+        .intr_priority = 0,
+        .flags = {0}
+    };
+    i3c_master_bus_handle_t bus_handle;
+    gpio_pullup_en(I3C_MASTER_SCL_IO);
+    gpio_pullup_en(I3C_MASTER_SDA_IO);
+
+    TEST_ESP_OK(i3c_new_master_bus(&i3c_mst_config, &bus_handle));
+
+    i3c_device_i2c_config_t dev_cfg = {
+        .device_address = TEST_STATIC_ADDRESS,
+        .scl_freq_hz = 100 * 1000
+    };
+    i3c_master_i2c_device_handle_t dev;
+    TEST_ESP_OK(i3c_master_bus_add_i2c_device(bus_handle, &dev_cfg, &dev));
+
+    unity_wait_for_signal("i2c slave init finish");
+
+    i3c_master_i2c_device_receive(dev, data_rd, DATA_LENGTH, -1);
+    vTaskDelay(100 / portTICK_PERIOD_MS);
+    for (int i = 0; i < DATA_LENGTH; i++) {
+        printf("%x\n", data_rd[i]);
+        TEST_ASSERT(data_rd[i] == i);
+    }
+    unity_send_signal("ready to delete master read test");
+
+    TEST_ESP_OK(i3c_master_bus_rm_i2c_device(dev));
+    TEST_ESP_OK(i3c_del_master_bus(bus_handle));
+}
+
+static void i3c_i2c_slave_write_buffer_test(void)
+{
+
+    uint8_t data_wr[DATA_LENGTH];
+
+    i3c_slave_init();
+
+    for (int i = 0; i < DATA_LENGTH; i++) {
+        data_wr[i] = i;
+    }
+
+    i3c_slave_ll_write_data(&I3C_SLV, data_wr, DATA_LENGTH);
+
+    unity_send_signal("i2c slave init finish");
+
+    unity_wait_for_signal("ready to delete master read test");
+}
+
+TEST_CASE_MULTIPLE_DEVICES("I3C-I2C master read slave test in fifo mode", "[i3c][test_env=generic_multi_device][timeout=150]", i3c_i2c_master_read_slave_test, i3c_i2c_slave_write_buffer_test);
+
+static void i3c_i2c_master_write_via_dma_test(void)
+{
+    __attribute__((aligned(4))) uint8_t data_wr[DATA_LENGTH] = { 0 };
+    int i;
+
+    i3c_master_bus_config_t i3c_mst_config = {
+        .sda_io_num = I3C_MASTER_SDA_IO,
+        .scl_io_num = I3C_MASTER_SCL_IO,
+        .clock_source = I3C_MASTER_CLK_SRC_DEFAULT,
+        .trans_queue_depth = 1,
+        .intr_priority = 0,
+        .flags = {0}
+    };
+    i3c_master_bus_handle_t bus_handle;
+    gpio_pullup_en(I3C_MASTER_SCL_IO);
+    gpio_pullup_en(I3C_MASTER_SDA_IO);
+
+    TEST_ESP_OK(i3c_new_master_bus(&i3c_mst_config, &bus_handle));
+
+    i3c_device_i2c_config_t dev_cfg = {
+        .device_address = TEST_STATIC_ADDRESS,
+        .scl_freq_hz = 100 * 1000
+    };
+    i3c_master_i2c_device_handle_t dev;
+    TEST_ESP_OK(i3c_master_bus_add_i2c_device(bus_handle, &dev_cfg, &dev));
+
+    i3c_master_dma_config_t dma_config = {
+        .max_transfer_size = 50,
+        .dma_burst_size = 16,
+    };
+
+    i3c_master_bus_decorate_dma(bus_handle, &dma_config);
+
+    unity_send_signal("i2c master init first");
+
+    unity_wait_for_signal("i2c slave init finish");
+
+    unity_send_signal("master write");
+    for (i = 0; i < DATA_LENGTH; i++) {
+        data_wr[i] = i;
+    }
+
+    ESP_LOG_BUFFER_HEX(TAG, data_wr, i);
+    i3c_master_i2c_device_transmit(dev, data_wr, DATA_LENGTH, -1);
+
+    unity_wait_for_signal("ready to delete");
+
+    TEST_ESP_OK(i3c_master_bus_rm_i2c_device(dev));
+    TEST_ESP_OK(i3c_master_bus_decorate_dma(bus_handle, NULL));
+    TEST_ESP_OK(i3c_del_master_bus(bus_handle));
+}
+
+TEST_CASE_MULTIPLE_DEVICES("I3C-I2C master write slave test in dma mode", "[i3c][test_env=generic_multi_device][timeout=150]", i3c_i2c_master_write_via_dma_test, i3c_i2c_slave_read_test);

components/esp_driver_i3c/test_apps/i3c_test_apps/pytest_i3c.py

@@ -18,3 +18,17 @@ from pytest_embedded_idf.utils import soc_filtered_targets
 @idf_parametrize('target', soc_filtered_targets('SOC_I3C_MASTER_SUPPORTED == 1'), indirect=['target'])
 def test_i3c(dut: Dut) -> None:
     dut.run_all_single_board_cases()
+
+
+@pytest.mark.generic_multi_device
+@pytest.mark.parametrize(
+    'count, config',
+    [
+        (2, 'release'),
+        (2, 'cache_safe'),
+    ],
+    indirect=True,
+)
+@idf_parametrize('target', soc_filtered_targets('SOC_I3C_MASTER_SUPPORTED == 1'), indirect=['target'])
+def test_i3c_multi_device(case_tester) -> None:  # type: ignore
+    case_tester.run_all_multi_dev_cases(reset=True)

components/hal/esp32p4/include/hal/i3c_master_ll.h

@@ -14,7 +14,6 @@
 #include "soc/soc_caps.h"
 #include "soc/clk_tree_defs.h"
 #include "soc/hp_sys_clkrst_struct.h"
-#include "soc/lpperi_struct.h"
 #include "hal/misc.h"
 #include "soc/i3c_mst_mem_struct.h"
 #include "soc/i3c_mst_struct.h"

components/hal/esp32p4/include/hal/i3c_slave_ll.h

@@ -0,0 +1,211 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// The LL layer for I3C slave register operations
+
+#include <stdbool.h>
+#include <stddef.h>
+#include "hal/misc.h"
+#include "hal/assert.h"
+#include "soc/soc_caps.h"
+#include "soc/clk_tree_defs.h"
+#include "soc/hp_sys_clkrst_struct.h"
+#include "hal/misc.h"
+#include "soc/i3c_slv_struct.h"
+#include "soc/i3c_slv_reg.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define I3C_SLAVE_LL_EVENT_INTR        (I3C_SLV_RXPEND_ENA_M | I3C_SLV_TXSEND_ENA_M)
+
+
+/**
+ * @brief Enable or disable I3C slave bus clock
+ *
+ * @param hw I3C slave hardware pointer (currently unused)
+ * @param enable true: enable clock, false: disable clock
+ */
+static inline void i3c_slave_ll_enable_bus_clock(i3c_slv_dev_t *hw, bool enable)
+{
+    (void)hw; // Suppress unused parameter warning
+    HP_SYS_CLKRST.soc_clk_ctrl2.reg_i3c_slv_apb_clk_en = enable;
+}
+
+/// use a macro to wrap the function, force the caller to use it in a critical section
+/// the critical section needs to declare the __DECLARE_RCC_ATOMIC_ENV variable in advance
+#define i3c_slave_ll_enable_bus_clock(...) do {(void)__DECLARE_RCC_ATOMIC_ENV; i3c_slave_ll_enable_bus_clock(__VA_ARGS__);} while(0)
+
+/**
+ * @brief Reset I3C slave registers
+ *
+ * Perform register reset by setting reset signal to 1 then 0
+ *
+ * @param hw I3C slave hardware pointer (currently unused)
+ */
+static inline void i3c_slave_ll_reset_register(i3c_slv_dev_t *hw)
+{
+    (void)hw; // Suppress unused parameter warning
+    HP_SYS_CLKRST.hp_rst_en1.reg_rst_en_i3cslv = 1;
+    HP_SYS_CLKRST.hp_rst_en1.reg_rst_en_i3cslv = 0;
+}
+
+/// use a macro to wrap the function, force the caller to use it in a critical section
+/// the critical section needs to declare the __DECLARE_RCC_ATOMIC_ENV variable in advance
+#define i3c_slave_ll_reset_register(...) do {(void)__DECLARE_RCC_ATOMIC_ENV; i3c_slave_ll_reset_register(__VA_ARGS__);} while(0)
+
+/**
+ * @brief Configure I3C slave static address
+ *
+ * @param hw I3C slave hardware pointer
+ * @param address 7-bit static address to set
+ */
+static inline void i3c_slave_ll_config_static_address(i3c_slv_dev_t *hw, uint8_t address)
+{
+    hw->config.saddr = address;
+}
+
+
+/**
+ * @brief Get pointer to I3C slave interrupt status register
+ *
+ * @param dev I3C slave hardware pointer
+ * @return volatile void* Pointer to interrupt masked status register
+ */
+static inline volatile void *i3c_slave_ll_get_interrupt_status_reg(i3c_slv_dev_t *dev)
+{
+    return &dev->intmasked;
+}
+
+
+/**
+ * @brief Clear I3C slave interrupt flags
+ *
+ * @param dev I3C slave hardware pointer
+ * @param mask Interrupt bit mask to clear
+ */
+static inline void i3c_slave_ll_clear_intr_mask(i3c_slv_dev_t *dev, uint32_t mask)
+{
+    dev->intclr.val = mask;
+}
+
+/**
+ * @brief Enable I3C slave interrupt mask
+ *
+ * @param dev I3C slave hardware pointer
+ * @param mask Interrupt bit mask to enable
+ */
+static inline void i3c_slave_ll_enable_intr_mask(i3c_slv_dev_t *dev, uint32_t mask)
+{
+    dev->intset.val |= mask;
+}
+
+/**
+ * @brief Disable I3C slave interrupt mask
+ *
+ * @param dev I3C slave hardware pointer
+ * @param mask Interrupt bit mask to disable
+ */
+static inline void i3c_slave_ll_disable_intr_mask(i3c_slv_dev_t *dev, uint32_t mask)
+{
+    dev->intset.val &= (~mask);
+}
+
+/**
+ * @brief Get current I3C slave interrupt mask status
+ *
+ * @param dev I3C slave hardware pointer
+ * @param intr_status Pointer to store interrupt status
+ */
+static inline void i3c_slave_ll_get_intr_mask(i3c_slv_dev_t *dev, uint32_t *intr_status)
+{
+    *intr_status = dev->intmasked.val;
+}
+
+/**
+ * @brief Write data to I3C slave device
+ *
+ * Write data to transmit FIFO byte by byte
+ *
+ * @param dev I3C slave hardware pointer
+ * @param data Pointer to data to write
+ * @param length Length of data to write (bytes)
+ */
+static inline void i3c_slave_ll_write_data(i3c_slv_dev_t *dev, const uint8_t *data, size_t length)
+{
+    for (size_t i = 0; i < length; i++) {
+        dev->wdatab.val = data[i];
+    }
+}
+
+/**
+ * @brief Get data length in I3C slave receive FIFO
+ *
+ * @param dev I3C slave hardware pointer
+ * @return size_t Number of bytes available to read in receive FIFO
+ */
+static inline size_t i3c_slave_ll_get_read_data_length(i3c_slv_dev_t *dev)
+{
+    return dev->datactrl.rxcount;
+}
+
+/**
+ * @brief Read data from I3C slave device
+ *
+ * Read data from receive FIFO byte by byte
+ *
+ * @param dev I3C slave hardware pointer
+ * @param data Buffer to store read data
+ * @param length Length of data to read (bytes)
+ */
+static inline void i3c_slave_ll_read_data(i3c_slv_dev_t *dev, uint8_t *data, size_t length)
+{
+    for (size_t i = 0; i < length; i++) {
+        data[i] = dev->rdarab.data0;
+    }
+}
+
+/**
+ * @brief Unlock or lock I3C slave registers
+ *
+ * @param dev I3C slave hardware pointer
+ * @param unlock true: unlock registers to allow modification, false: lock registers to prevent modification
+ */
+static inline void i3c_slave_ll_unlock_register(i3c_slv_dev_t *dev, bool unlock)
+{
+    dev->datactrl.unlock = unlock;
+}
+
+/**
+ * @brief Set I3C slave transmit FIFO trigger level
+ *
+ * When transmit FIFO contains fewer bytes than this level, interrupt or DMA request will be triggered
+ *
+ * @param dev I3C slave hardware pointer
+ * @param threshold Transmit FIFO trigger level (0-3)
+ */
+static inline void i3c_slave_ll_set_transmit_fifo_threshold(i3c_slv_dev_t *dev, uint8_t threshold)
+{
+    dev->datactrl.txtrig = threshold;
+}
+
+/**
+ * @brief Set I3C slave receive FIFO trigger level
+ *
+ * When receive FIFO reaches this level, interrupt or DMA request will be triggered
+ *
+ * @param dev I3C slave hardware pointer
+ * @param threshold Receive FIFO trigger level (0-3)
+ */
+static inline void i3c_slave_ll_set_receive_fifo_threshold(i3c_slv_dev_t *dev, uint8_t threshold)
+{
+    dev->datactrl.rxtrig = threshold;
+}
+
+#ifdef __cplusplus
+}
+#endif