feat(isp): support ISP DPC, add tests and use it in multi pipeline example

examples/peripherals/isp/multi_pipelines/main/example_dpc.h

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+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file example_dpc.h
+ * @brief Dead Pixel Correction (DPC) Functionality
+ */
+
+#pragma once
+
+#include "esp_err.h"
+#include "driver/isp.h"
+#include "driver/isp_dpc.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Initialize DPC module
+ *
+ * @param[in] isp_proc ISP processor handle
+ * @param[in] calibration_ref Static calibration coordinate reference, or NULL to skip static correction
+ * @return
+ *         - ESP_OK: Success
+ *         - ESP_ERR_INVALID_ARG: Invalid arguments
+ *         - ESP_ERR_INVALID_STATE: DPC is already enabled
+ *         - ESP_ERR_NOT_SUPPORTED: Not supported on this chip revision
+ */
+esp_err_t example_isp_dpc_init(isp_proc_handle_t isp_proc, const esp_isp_dpc_calibration_ref_t *calibration_ref);
+
+/**
+ * @brief Calibrate static DPC using the active CSI ISP processor
+ *
+ * The function prompts the user to present uniform white and black images to the
+ * camera and press Enter after each image is ready, then captures one frame of
+ * each to produce a merged calibration result.
+ * DPC must be disabled before calling this function.
+ *
+ * @param[in] isp_proc           ISP processor handle receiving CSI input
+ * @param[out] calibration_ref   Merged static calibration coordinate reference
+ * @return
+ *         - ESP_OK: Success
+ *         - ESP_ERR_INVALID_ARG: Invalid arguments
+ *         - ESP_ERR_TIMEOUT: Calibration frame was not received in time
+ */
+esp_err_t example_isp_dpc_calibrate_static(isp_proc_handle_t isp_proc, esp_isp_dpc_calibration_ref_t *calibration_ref);
+
+/**
+ * @brief Enable DPC module
+ *
+ * @param[in] isp_proc ISP processor handle
+ * @return
+ *         - ESP_OK: Success
+ *         - ESP_ERR_INVALID_ARG: Invalid arguments
+ *         - ESP_ERR_INVALID_STATE: Invalid state
+ */
+esp_err_t example_isp_dpc_enable(isp_proc_handle_t isp_proc);
+
+#ifdef __cplusplus
+}
+#endif