software and system v1

1 software design/components/osal/spi_wrapper/COMPONENT.md

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+# SPI Wrapper Component
+## OSAL Layer - ESP-IDF v5.4 Abstraction
+
+**Component ID:** C-OSAL-SPI  
+**Version:** 1.0  
+**Date:** 2025-02-01  
+**Location:** `osal/spi_wrapper/`  
+**ESP-IDF Service:** `driver/spi_master.h`, `driver/spi_slave.h`
+
+---
+
+## 1. Component Overview
+
+The SPI Wrapper provides a platform-independent interface for SPI bus operations, abstracting ESP-IDF v5.4 SPI master and slave drivers. This component enables storage drivers and other components to access SPI devices (SD cards, flash chips) without direct ESP-IDF dependencies.
+
+**Primary Purpose:** Abstract SPI bus operations for application components.
+
+---
+
+## 2. Responsibilities
+
+### 2.1 In-Scope
+
+- SPI bus initialization and configuration
+- SPI device registration and management
+- SPI transaction operations (master mode)
+- SPI bus error handling and recovery
+- SPI bus resource management
+- SPI timeout handling
+- SPI bus status monitoring
+
+### 2.2 Out-of-Scope
+
+- SPI slave mode (not required for sensor hub)
+- SPI protocol-level error recovery (handled by ESP-IDF)
+- Device-specific SPI protocols (handled by storage drivers)
+
+---
+
+## 3. Provided Interfaces
+
+### 3.1 Bus Management Interface
+
+```c
+/**
+ * @brief Initialize SPI bus
+ * @param bus_num SPI bus number (SPI1_HOST, SPI2_HOST, SPI3_HOST)
+ * @param config Bus configuration (clock speed, pins, mode)
+ * @return OSAL_OK on success
+ */
+osal_result_t osal_spi_bus_init(spi_bus_num_t bus_num, const osal_spi_bus_config_t* config);
+
+/**
+ * @brief Deinitialize SPI bus
+ * @param bus_num SPI bus number
+ * @return OSAL_OK on success
+ */
+osal_result_t osal_spi_bus_deinit(spi_bus_num_t bus_num);
+```
+
+### 3.2 Device Management Interface
+
+```c
+/**
+ * @brief Register SPI device on bus
+ * @param bus_num SPI bus number
+ * @param device_config Device configuration (CS pin, mode, clock speed)
+ * @param device_handle Output device handle
+ * @return OSAL_OK on success
+ */
+osal_result_t osal_spi_device_register(spi_bus_num_t bus_num, 
+                                        const osal_spi_device_config_t* device_config,
+                                        osal_spi_device_handle_t* device_handle);
+
+/**
+ * @brief Unregister SPI device
+ * @param device_handle Device handle
+ * @return OSAL_OK on success
+ */
+osal_result_t osal_spi_device_unregister(osal_spi_device_handle_t device_handle);
+```
+
+### 3.3 Transaction Interface
+
+```c
+/**
+ * @brief Perform SPI transaction
+ * @param device_handle Device handle
+ * @param tx_data Transmit data buffer (NULL if read-only)
+ * @param rx_data Receive data buffer (NULL if write-only)
+ * @param length Transaction length in bytes
+ * @param timeout_ms Timeout in milliseconds
+ * @return OSAL_OK on success
+ */
+osal_result_t osal_spi_transaction(osal_spi_device_handle_t device_handle,
+                                    const uint8_t* tx_data, uint8_t* rx_data,
+                                    size_t length, uint32_t timeout_ms);
+```
+
+---
+
+## 4. ESP-IDF v5.4 Integration
+
+- Uses `spi_bus_handle_t` and `spi_device_handle_t`
+- Supports SPI1_HOST, SPI2_HOST, SPI3_HOST
+- Clock speed: Up to 80MHz (ESP32-S3 limit)
+- SPI modes: 0, 1, 2, 3 supported
+
+---
+
+## 5. Traceability
+
+- **SR-HW-005:** Hardware interface abstraction
+- **SWR-IF-002:** SPI protocol support
+- **SWR-DESIGN-003:** OSAL layer access
+
+---
+
+**Document Status:** Complete  
+**Next Review:** Before implementation