1 files changed, 78 insertions, 0 deletions
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_FreedomStudio/freedom-metal/metal/spi.h b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_FreedomStudio/freedom-metal/metal/spi.h
new file mode 100644
index 000000000..b011fe3ce
--- /dev/null
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_FreedomStudio/freedom-metal/metal/spi.h
@@ -0,0 +1,78 @@
+/* Copyright 2018 SiFive, Inc */
+/* SPDX-License-Identifier: Apache-2.0 */
+
+#ifndef METAL__SPI_H
+#define METAL__SPI_H
+
+struct metal_spi;
+
+/*! @brief The configuration for a SPI transfer */
+struct metal_spi_config {
+    /*! @brief The protocol for the SPI transfer */
+    enum {
+        METAL_SPI_SINGLE,
+        METAL_SPI_DUAL,
+        METAL_SPI_QUAD
+    } protocol;
+
+    /*! @brief The polarity of the SPI transfer, equivalent to CPOL */
+    unsigned int polarity : 1;
+    /*! @brief The phase of the SPI transfer, equivalent to CPHA */
+    unsigned int phase : 1;
+    /*! @brief The endianness of the SPI transfer */
+    unsigned int little_endian : 1;
+    /*! @brief The active state of the chip select line */
+    unsigned int cs_active_high : 1;
+    /*! @brief The chip select ID to activate for the SPI transfer */
+    unsigned int csid;
+};
+
+struct metal_spi_vtable {
+    void (*init)(struct metal_spi *spi, int baud_rate);
+    int (*transfer)(struct metal_spi *spi, struct metal_spi_config *config, size_t len, char *tx_buf, char *rx_buf);
+    int (*get_baud_rate)(struct metal_spi *spi);
+    int (*set_baud_rate)(struct metal_spi *spi, int baud_rate);
+};
+
+/*! @brief A handle for a SPI device */
+struct metal_spi {
+    const struct metal_spi_vtable *vtable;
+};
+
+/*! @brief Get a handle for a SPI device
+ * @param device_num The index of the desired SPI device
+ * @return A handle to the SPI device, or NULL if the device does not exist*/
+struct metal_spi *metal_spi_get_device(int device_num);
+
+/*! @brief Initialize a SPI device with a certain baud rate
+ * @param spi The handle for the SPI device to initialize
+ * @param baud_rate The baud rate to set the SPI device to
+ */
+inline void metal_spi_init(struct metal_spi *spi, int baud_rate) { spi->vtable->init(spi, baud_rate); }
+
+/*! @brief Perform a SPI transfer
+ * @param spi The handle for the SPI device to perform the transfer
+ * @param config The configuration for the SPI transfer.
+ * @param len The number of bytes to transfer
+ * @param tx_buf The buffer to send over the SPI bus. Must be len bytes long. If NULL, the SPI will transfer the value 0.
+ * @param rx_buf The buffer to receive data into. Must be len bytes long. If NULL, the SPI will ignore received bytes.
+ * @return 0 if the transfer succeeds
+ */
+inline int metal_spi_transfer(struct metal_spi *spi, struct metal_spi_config *config, size_t len, char *tx_buf, char *rx_buf) {
+    return spi->vtable->transfer(spi, config, len, tx_buf, rx_buf);
+}
+
+/*! @brief Get the current baud rate of the SPI device
+ * @param spi The handle for the SPI device
+ * @return The baud rate in Hz
+ */
+inline int metal_spi_get_baud_rate(struct metal_spi *spi) { return spi->vtable->get_baud_rate(spi); }
+
+/*! @brief Set the current baud rate of the SPI device
+ * @param spi The handle for the SPI device
+ * @param baud_rate The desired baud rate of the SPI device
+ * @return 0 if the baud rate is successfully changed
+ */
+inline int metal_spi_set_baud_rate(struct metal_spi *spi, int baud_rate) { return spi->vtable->set_baud_rate(spi, baud_rate); }
+
+#endif