From 03ca528d91948e10cc05617122cd786026c4681e Mon Sep 17 00:00:00 2001
From: Henrik Stickann <4376396-Mithradir@users.noreply.gitlab.com>
Date: Sat, 9 Apr 2022 21:49:04 +0200
Subject: [PATCH] Add HAL SPI implementation

---
 include/sta/hal/spi.hpp | 70 +++++++++++++++++++++++++++++++++++++++++
 src/hal/spi.cpp         | 70 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 140 insertions(+)
 create mode 100644 include/sta/hal/spi.hpp
 create mode 100644 src/hal/spi.cpp

diff --git a/include/sta/hal/spi.hpp b/include/sta/hal/spi.hpp
new file mode 100644
index 0000000..a8b2afe
--- /dev/null
+++ b/include/sta/hal/spi.hpp
@@ -0,0 +1,70 @@
+/**
+ * @brief Implementations for SpiInterface and SpiDevice using HAL.
+ *
+ * Define STA_HAL_SPI_ENABLE in <sta/config.hpp> to enable.
+ * Requires STA_HAL_GPIO_ENABLE.
+ */
+#ifndef STA_HAL_SPI_HPP
+#define STA_HAL_SPI_HPP
+
+#include <sta/config.hpp>
+#ifdef STA_HAL_SPI_ENABLE
+
+#include <sta/spi_device.hpp>
+#include <sta/hal/gpio_pin.hpp>
+
+#include <main.h>
+
+
+namespace sta
+{
+	/**
+	 * @brief Implementation of SpiInterface using HAL.
+	 */
+	class HalSpiInterface : public SpiInterface
+	{
+	public:
+		/**
+		 * @param handle    SPI handle
+		 * @param mutex     Mutex object for managing access. Pass nullptr for no access control
+		 */
+		HalSpiInterface(SPI_HandleTypeDef * handle, Mutex * mutex = nullptr);
+
+		void transfer(uint8_t value) override;
+		void transfer(const uint8_t * buffer, size_t size) override;
+		void transfer16(uint16_t value) override;
+
+		void fill(uint8_t value, size_t count) override;
+		void fill32(uint32_t value, size_t count) override;
+
+		void receive(uint8_t * buffer, size_t size) override;
+
+	private:
+		SPI_HandleTypeDef * handle_;    /**< SPI handle */
+	};
+
+
+	/**
+	 * @brief Implementation of SpiDevice using HAL.
+	 */
+	class HalSpiDevice : public SpiDevice
+	{
+	public:
+		/**
+		 * @param intf      SPI interface
+		 * @param csPin     Device CS pin
+		 */
+		HalSpiDevice(SpiInterface * intf, HalGpioPin csPin);
+
+		void select() override;
+		void deselect() override;
+
+	private:
+		HalGpioPin csPin_;  /**< Device CS pin */
+	};
+} // namespace sta
+
+
+#endif // STA_HAL_SPI_ENABLE
+
+#endif // STA_HAL_SPI_HPP
diff --git a/src/hal/spi.cpp b/src/hal/spi.cpp
new file mode 100644
index 0000000..48f25f1
--- /dev/null
+++ b/src/hal/spi.cpp
@@ -0,0 +1,70 @@
+#include <sta/hal/spi.hpp>
+
+#ifdef STA_HAL_SPI_ENABLE
+
+
+namespace sta
+{
+	HalSpiInterface::HalSpiInterface(SPI_HandleTypeDef * handle, Mutex * mutex /* = nullptr */)
+		: SpiInterface(mutex), handle_{handle}
+	{}
+
+
+	void HalSpiInterface::transfer(uint8_t data)
+	{
+		HAL_SPI_Transmit(handle_, &data, 1, HAL_MAX_DELAY);
+	}
+
+	void HalSpiInterface::transfer(const uint8_t * data, size_t size)
+	{
+		HAL_SPI_Transmit(handle_, const_cast<uint8_t *>(data), size, HAL_MAX_DELAY);
+	}
+
+
+	void HalSpiInterface::transfer16(uint16_t value)
+	{
+		HAL_SPI_Transmit(handle_, reinterpret_cast<uint8_t *>(&value), 2, HAL_MAX_DELAY);
+	}
+
+
+	void HalSpiInterface::fill(uint8_t value, size_t count)
+	{
+		for (size_t i = 0; i < count; ++i)
+		{
+			transfer(value);
+		}
+	}
+
+	void HalSpiInterface::fill32(uint32_t value, size_t count)
+	{
+		for (size_t i = 0; i < count; ++i)
+		{
+			HAL_SPI_Transmit(handle_, reinterpret_cast<uint8_t *>(&value), 4, HAL_MAX_DELAY);
+		}
+	}
+
+
+	void HalSpiInterface::receive(uint8_t * data, size_t size)
+	{
+		HAL_SPI_Receive(handle_, data, size, HAL_MAX_DELAY);
+	}
+
+
+
+	HalSpiDevice::HalSpiDevice(SpiInterface * intf, HalGpioPin csPin)
+		: SpiDevice(intf), csPin_{csPin}
+	{}
+
+	void HalSpiDevice::select()
+	{
+		STA_HAL_GPIO_PIN_WRITE(csPin_, GPIO_PIN_RESET);
+	}
+
+	void HalSpiDevice::deselect()
+	{
+		STA_HAL_GPIO_PIN_WRITE(csPin_, GPIO_PIN_SET);
+	}
+} // namespace sta
+
+
+#endif // STA_HAL_SPI_ENABLE