spi.h ( File view )

  • By gregkam 2014-10-06
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			/*
 * spi.h --- STM32F4 SPI driver.
 *
 * Copyright (C) 2012, Galois, Inc.
 * All Rights Reserved.
 *
 * This software is released under the "BSD3" license.  Read the file
 * "LICENSE" for more information.
 */

#ifndef __hwf4_spi_h
#define __hwf4_spi_h

#ifdef __cplusplus
extern "C" {

#endif

#include <FreeRTOS.h>

#include <stdbool.h>
#include <stdint.h>
#include <sys/types.h>

#include "gpio.h"

/**
 * Abstract data type representing one SPI bus in the STM32F4.
 */
struct spi_bus;

/**
 * Divisors for SPI device baud rate selection.
 *
 * The SPI frequency will be fPCLK divided by this divisor.
 */
enum spi_baud {

  SPI_BAUD_DIV_2   = 0x00,
  SPI_BAUD_DIV_4   = 0x01,
  SPI_BAUD_DIV_8   = 0x02,
  SPI_BAUD_DIV_16  = 0x03,
  SPI_BAUD_DIV_32  = 0x04,
  SPI_BAUD_DIV_64  = 0x05,
  SPI_BAUD_DIV_128 = 0x06,
  SPI_BAUD_DIV_256 = 0x07

};

/**
 * Clock polarity for SPI devices.
 */
enum spi_clock_polarity {

  SPI_CLOCK_POLARITY_LOW  = 0x00, /* clock to 0 when idle */
  SPI_CLOCK_POLARITY_HIGH = 0x01  /* clock to 1 when idle */

};

/**
 * Clock phase for SPI devices.
 */
enum spi_clock_phase {

  SPI_CLOCK_PHASE_1 = 0x00,     /* latch on 1st clock edge */
  SPI_CLOCK_PHASE_2 = 0x01      /* latch on 2nd clock edge */

};

/**
 * Bit order for SPI devices.
 */
enum spi_bit_order {

  SPI_BIT_ORDER_MSB_FIRST = 0x00, /* MSB transmitted first */
  SPI_BIT_ORDER_LSB_FIRST = 0x01  /* LSB transmitted first */

};

/**
 * Information about a device connected to a SPI bus.
 *
 * Each device driver will fill in an instance of this structure
 * containing the configuration of its device.  The SPI functions
 * accept both the bus to communicate over and the device containing
 * the device-specific configuration.
 */
struct spi_device {

  struct pin *chip_select;                /* chip select pin */
  bool chip_select_active;                /* CS active high if true */
  enum spi_baud baud;                     /* baud rate divisor */
  enum spi_clock_polarity clock_polarity; /* SCLK polarity */
  enum spi_clock_phase clock_phase;       /* SCLK phase */
  enum spi_bit_order bit_order;           /* frame format (bit order) */

};

/**
 * Initialize a SPI bus.
 *
 * This starts a task to manage SPI transfers for this bus.  The task
 * wakes up when transfers are started by "spi_transfer", and sleeps
 * when there are no transfers to process.
 *
 * @ret
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build.mk1.82 kB2013-04-23|01:09
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default_hooks.c159.00 B2013-04-23|01:09
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Makefile327.00 B2013-04-23|01:09
README.md217.00 B2013-04-23|01:09
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