73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* HAL/SPI.h
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* Core Marlin definitions for SPI, implemented in the HALs
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*/
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#ifndef _SPI_H_
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#define _SPI_H_
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#include <stdint.h>
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/**
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* SPI speed where 0 <= index <= 6
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*
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* Approximate rates :
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*
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* 0 : 8 - 10 MHz
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* 1 : 4 - 5 MHz
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* 2 : 2 - 2.5 MHz
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* 3 : 1 - 1.25 MHz
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* 4 : 500 - 625 kHz
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* 5 : 250 - 312 kHz
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* 6 : 125 - 156 kHz
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*
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* On AVR, actual speed is F_CPU/2^(1 + index).
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* On other platforms, speed should be in range given above where possible.
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*/
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#define SPI_FULL_SPEED 0 // Set SCK to max rate
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#define SPI_HALF_SPEED 1 // Set SCK rate to half of max rate
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#define SPI_QUARTER_SPEED 2 // Set SCK rate to quarter of max rate
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#define SPI_EIGHTH_SPEED 3 // Set SCK rate to 1/8 of max rate
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#define SPI_SIXTEENTH_SPEED 4 // Set SCK rate to 1/16 of max rate
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#define SPI_SPEED_5 5 // Set SCK rate to 1/32 of max rate
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#define SPI_SPEED_6 6 // Set SCK rate to 1/64 of max rate
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// Standard SPI functions
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/** Initialise SPI bus */
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void spiBegin(void);
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/** Configure SPI for specified SPI speed */
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void spiInit(uint8_t spiRate);
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/** Write single byte to SPI */
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void spiSend(uint8_t b);
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/** Read single byte from SPI */
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uint8_t spiRec(void);
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/** Read from SPI into buffer */
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void spiRead(uint8_t* buf, uint16_t nbyte);
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/** Write token and then write from 512 byte buffer to SPI (for SD card) */
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void spiSendBlock(uint8_t token, const uint8_t* buf);
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#endif // _SPI_H_
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