Add BH24 I2C support

targets/bornhack-2024-pov/badge_bsp_i2c.c

@@ -0,0 +1,72 @@
+// SPDX-FileCopyrightText: 2025 Nicolai Electronics
+// SPDX-License-Identifier: MIT
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "bh24_hardware.h"
+#include "bsp/i2c.h"
+#include "driver/gpio.h"
+#include "driver/i2c_master.h"
+#include "esp_check.h"
+#include "esp_err.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
+
+static char const* TAG = "BSP I2C";
+
+// Primary I2C bus
+
+static i2c_master_bus_handle_t i2c_bus_handle_internal   = NULL;
+static SemaphoreHandle_t       i2c_concurrency_semaphore = NULL;
+
+i2c_master_bus_config_t i2c_master_config_internal = {
+    .clk_source                   = I2C_CLK_SRC_DEFAULT,
+    .i2c_port                     = BSP_I2C_BUS,
+    .scl_io_num                   = BSP_I2C_SCL_PIN,
+    .sda_io_num                   = BSP_I2C_SDA_PIN,
+    .glitch_ignore_cnt            = 7,
+    .flags.enable_internal_pullup = true,
+};
+
+esp_err_t bsp_i2c_primary_bus_initialize(void) {
+    ESP_RETURN_ON_ERROR(i2c_new_master_bus(&i2c_master_config_internal, &i2c_bus_handle_internal), TAG,
+                        "Failed to initialize I2C bus");
+    i2c_concurrency_semaphore = xSemaphoreCreateBinary();
+    if (i2c_concurrency_semaphore == NULL) {
+        return ESP_ERR_NO_MEM;
+    }
+    xSemaphoreGive(i2c_concurrency_semaphore);
+    return ESP_OK;
+}
+
+esp_err_t bsp_i2c_primary_bus_get_handle(i2c_master_bus_handle_t* handle) {
+    if (handle == NULL) {
+        return ESP_ERR_INVALID_ARG;
+    }
+    *handle = i2c_bus_handle_internal;
+    return ESP_OK;
+}
+
+esp_err_t bsp_i2c_primary_bus_get_semaphore(SemaphoreHandle_t* semaphore) {
+    if (semaphore == NULL) {
+        return ESP_ERR_INVALID_ARG;
+    }
+    *semaphore = i2c_concurrency_semaphore;
+    return ESP_OK;
+}
+
+esp_err_t bsp_i2c_primary_bus_claim(void) {
+    if (i2c_concurrency_semaphore != NULL) {
+        xSemaphoreTake(i2c_concurrency_semaphore, portMAX_DELAY);
+    } else {
+        ESP_LOGW(TAG, "No concurrency semaphore");
+    }
+    return ESP_OK;
+}
+
+esp_err_t bsp_i2c_primary_bus_release(void) {
+    if (i2c_concurrency_semaphore != NULL) {
+        xSemaphoreGive(i2c_concurrency_semaphore);
+    }
+    return ESP_OK;
+}