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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * Based on Sprinter and grbl.
- * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
- *
- * 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/>.
- *
- */
- #pragma once
-
- /**
- * HAL/shared/HAL_SPI.h
- * Core Marlin definitions for SPI, implemented in the HALs
- */
-
- #include "Marduino.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.
- */
-
- #define SPI_FULL_SPEED 0 // Set SCK to max rate
- #define SPI_HALF_SPEED 1 // Set SCK rate to half of max rate
- #define SPI_QUARTER_SPEED 2 // Set SCK rate to quarter of max rate
- #define SPI_EIGHTH_SPEED 3 // Set SCK rate to 1/8 of max rate
- #define SPI_SIXTEENTH_SPEED 4 // Set SCK rate to 1/16 of max rate
- #define SPI_SPEED_5 5 // Set SCK rate to 1/32 of max rate
- #define SPI_SPEED_6 6 // Set SCK rate to 1/64 of max rate
-
- //
- // Standard SPI functions
- //
-
- // Initialize SPI bus
- void spiBegin();
-
- // 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();
-
- // 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);
-
- // Begin SPI transaction, set clock, bit order, data mode
- void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode);
-
- //
- // Extended SPI functions taking a channel number (Hardware SPI only)
- //
-
- // Write single byte to specified SPI channel
- void spiSend(uint32_t chan, byte b);
-
- // Write buffer to specified SPI channel
- void spiSend(uint32_t chan, const uint8_t* buf, size_t n);
-
- // Read single byte from specified SPI channel
- uint8_t spiRec(uint32_t chan);
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