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/**
* Marlin 3D Printer Firmware
*
* Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
* SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
*
* 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 <https://www.gnu.org/licenses/>.
*
*/
/**
* Hardware and software SPI implementations are included in this file.
*
* Control of the slave select pin(s) is handled by the calling routines and
* SAMD51 let hardware SPI handling to remove SS from its logic.
*/
#ifdef __SAMD51__
// --------------------------------------------------------------------------
// Includes
// --------------------------------------------------------------------------
#include "../../inc/MarlinConfig.h"
#include <SPI.h>
// --------------------------------------------------------------------------
// Public functions
// --------------------------------------------------------------------------
#if EITHER(SOFTWARE_SPI, FORCE_SOFT_SPI)
// ------------------------
// Software SPI
// ------------------------
#error "Software SPI not supported for SAMD51. Use Hardware SPI."
#else // !SOFTWARE_SPI
#ifdef ADAFRUIT_GRAND_CENTRAL_M4
#if SD_CONNECTION_IS(ONBOARD)
#define sdSPI SDCARD_SPI
#else
#define sdSPI SPI
#endif
#endif
static SPISettings spiConfig;
// ------------------------
// Hardware SPI
// ------------------------
void spiBegin() {
spiInit(SPI_HALF_SPEED);
}
void spiInit(uint8_t spiRate) {
// Use datarates Marlin uses
uint32_t clock;
switch (spiRate) {
case SPI_FULL_SPEED: clock = 8000000; break;
case SPI_HALF_SPEED: clock = 4000000; break;
case SPI_QUARTER_SPEED: clock = 2000000; break;
case SPI_EIGHTH_SPEED: clock = 1000000; break;
case SPI_SIXTEENTH_SPEED: clock = 500000; break;
case SPI_SPEED_5: clock = 250000; break;
case SPI_SPEED_6: clock = 125000; break;
default: clock = 4000000; break; // Default from the SPI library
}
spiConfig = SPISettings(clock, MSBFIRST, SPI_MODE0);
sdSPI.begin();
}
/**
* @brief Receives a single byte from the SPI port.
*
* @return Byte received
*
* @details
*/
uint8_t spiRec() {
sdSPI.beginTransaction(spiConfig);
uint8_t returnByte = sdSPI.transfer(0xFF);
sdSPI.endTransaction();
return returnByte;
}
/**
* @brief Receives a number of bytes from the SPI port to a buffer
*
* @param buf Pointer to starting address of buffer to write to.
* @param nbyte Number of bytes to receive.
* @return Nothing
*/
void spiRead(uint8_t* buf, uint16_t nbyte) {
if (nbyte == 0) return;
memset(buf, 0xFF, nbyte);
sdSPI.beginTransaction(spiConfig);
sdSPI.transfer(buf, nbyte);
sdSPI.endTransaction();
}
/**
* @brief Sends a single byte on SPI port
*
* @param b Byte to send
*
* @details
*/
void spiSend(uint8_t b) {
sdSPI.beginTransaction(spiConfig);
sdSPI.transfer(b);
sdSPI.endTransaction();
}
/**
* @brief Write token and then write from 512 byte buffer to SPI (for SD card)
*
* @param buf Pointer with buffer start address
* @return Nothing
*
* @details Uses DMA
*/
void spiSendBlock(uint8_t token, const uint8_t* buf) {
sdSPI.beginTransaction(spiConfig);
sdSPI.transfer(token);
sdSPI.transfer((uint8_t*)buf, nullptr, 512);
sdSPI.endTransaction();
}
void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) {
spiConfig = SPISettings(spiClock, (BitOrder)bitOrder, dataMode);
sdSPI.beginTransaction(spiConfig);
}
#endif // !SOFTWARE_SPI
#endif // __SAMD51__
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