Implement HAL and apply macros across code-base

Implement AVR Platform

Marlin/src/HAL/HAL.h

@@ -0,0 +1,94 @@
+/* **************************************************************************
+
+ 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_ */