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project/ble_peripheral/ble_app_vivaMayo/spi2_bus.h

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+/*******************************************************************************
+ * @file    spi2_bus.h
+ * @brief   Shared SPI2 Bus Manager for ADA2200 and W25Q32RV Flash
+ * @author  Charles KWON <charleskwon@medithings.co.kr>
+ * @date    2025-02-03
+ *
+ * @details Both ADA2200 (Lock-in Amp) and W25Q32RV (Flash) share SPI2 bus.
+ *          This module manages bus initialization and provides access.
+ *          Device selection is done via individual CS pins:
+ *          - ADA2200:  CS = P0.13
+ *          - W25Q32RV: CS = P0.24
+ ******************************************************************************/
+
+#ifndef SPI2_BUS_H
+#define SPI2_BUS_H
+
+#include "nrf_drv_spi.h"
+#include "sdk_errors.h"
+#include <stdbool.h>
+
+/*==============================================================================
+ * SPI2 BUS CONFIGURATION
+ *============================================================================*/
+
+#define SPI2_BUS_INSTANCE       2
+
+/* Shared SPI pins */
+#define SPI2_SCK_PIN            14  /* P0.14 */
+#define SPI2_MISO_PIN           15  /* P0.15 */
+#define SPI2_MOSI_PIN           16  /* P0.16 */
+
+/* Device CS pins (active low) */
+#define SPI2_CS_ADA2200         13  /* P0.13 - Lock-in Amplifier */
+#define SPI2_CS_FLASH           24  /* P0.24 - W25Q32RV Flash */
+
+/*==============================================================================
+ * PUBLIC FUNCTIONS
+ *============================================================================*/
+
+/**
+ * @brief Initialize SPI2 bus (call once at startup)
+ * @return NRF_SUCCESS or error code
+ */
+ret_code_t spi2_bus_init(void);
+
+/**
+ * @brief Uninitialize SPI2 bus
+ */
+void spi2_bus_uninit(void);
+
+/**
+ * @brief Check if SPI2 bus is initialized
+ * @return true if initialized
+ */
+bool spi2_bus_is_initialized(void);
+
+/**
+ * @brief Get SPI2 bus instance for transfers
+ * @return Pointer to SPI instance (NULL if not initialized)
+ */
+const nrf_drv_spi_t* spi2_bus_get_instance(void);
+
+/**
+ * @brief Perform SPI transfer (blocking mode)
+ * @note Caller must manage CS pin manually
+ */
+ret_code_t spi2_bus_transfer(const uint8_t *tx_buf, uint8_t tx_len,
+                              uint8_t *rx_buf, uint8_t rx_len);
+
+#endif /* SPI2_BUS_H */