marlin/Marlin/src/HAL/HAL.h

/* **************************************************************************

 Marlin 3D Printer Firmware
 Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/

/**
 * Description: HAL wrapper
 *
 * Supports platforms :
 *    ARDUINO_ARCH_SAM : For Arduino Due and other boards based on Atmel SAM3X8E
 *    ARDUINO_ARCH_AVR : For all Atmel AVR boards
 */

#ifndef _HAL_H
#define _HAL_H

#include <stdint.h>

/**
 * SPI speed where 0 <= index <= 6
 *
 * Approximate rates :
 *
 *  0 :  8 - 10 MHz
 *  1 :  4 - 5 MHz
 *  2 :  2 - 2.5 MHz
 *  3 :  1 - 1.25 MHz
 *  4 :  500 - 625 kHz
 *  5 :  250 - 312 kHz
 *  6 :  125 - 156 kHz
 *
 *  On AVR, actual speed is F_CPU/2^(1 + index).
 *  On other platforms, speed should be in range given above where possible.
 */

/** Set SCK to max rate */
uint8_t const SPI_FULL_SPEED = 0;
/** Set SCK rate to half max rate. */
uint8_t const SPI_HALF_SPEED = 1;
/** Set SCK rate to quarter max rate. */
uint8_t const SPI_QUARTER_SPEED = 2;
/** Set SCK rate to 1/8 max rate. */
uint8_t const SPI_EIGHTH_SPEED = 3;
/** Set SCK rate to 1/16 of max rate. */
uint8_t const SPI_SIXTEENTH_SPEED = 4;
/** Set SCK rate to 1/32 of max rate. */
uint8_t const SPI_SPEED_5 = 5;
/** Set SCK rate to 1/64 of max rate. */
uint8_t const SPI_SPEED_6 = 6;

// Standard SPI functions
/** Initialise SPI bus */
void spiBegin(void);
/** Configure SPI for specified SPI speed */
void spiInit(uint8_t spiRate);
/** Write single byte to SPI */
void spiSend(uint8_t b);
/** Read single byte from SPI */
uint8_t spiRec(void);
/** Read from SPI into buffer */
void spiRead(uint8_t* buf, uint16_t nbyte);
/** Write token and then write from 512 byte buffer to SPI (for SD card) */
void spiSendBlock(uint8_t token, const uint8_t* buf);

#ifdef ARDUINO_ARCH_AVR
  #include "HAL_AVR/HAL_AVR.h"
#elif defined(ARDUINO_ARCH_SAM)
  #define CPU_32_BIT
  #include "HAL_DUE/HAL_Due.h"
  #include "math_32bit.h"
#elif defined(__MK64FX512__) || defined(__MK66FX1M0__)
  #define CPU_32_BIT
  #include "HAL_TEENSY35_36/HAL_Teensy.h"
  #include "math_32bit.h"
#else
  #error Unsupported Platform!
#endif

#endif /* HAL_H_ */