152 lines
4.2 KiB
C++
152 lines
4.2 KiB
C++
/**
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* Marlin 3D Printer Firmware
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*
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* Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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* SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
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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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* Hardware and software SPI implementations are included in this file.
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*
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* Control of the slave select pin(s) is handled by the calling routines and
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* SAMD51 let hardware SPI handling to remove SS from its logic.
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*/
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#ifdef __SAMD51__
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// --------------------------------------------------------------------------
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// Includes
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// --------------------------------------------------------------------------
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#include "../../inc/MarlinConfig.h"
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#include <SPI.h>
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// --------------------------------------------------------------------------
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// Public functions
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// --------------------------------------------------------------------------
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#if EITHER(SOFTWARE_SPI, FORCE_SOFT_SPI)
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// ------------------------
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// Software SPI
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// ------------------------
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#error "Software SPI not supported for SAMD51. Use Hardware SPI."
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#if SD_CONNECTION_IS(ONBOARD)
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#endif
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#else // !SOFTWARE_SPI
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#ifdef ADAFRUIT_GRAND_CENTRAL_M4
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#if SD_CONNECTION_IS(ONBOARD)
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#define sdSPI SDCARD_SPI
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#else
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#define sdSPI SPI
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#endif
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#endif
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static SPISettings spiConfig;
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// ------------------------
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// Hardware SPI
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// ------------------------
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void spiBegin() {
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spiInit(SPI_HALF_SPEED);
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}
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void spiInit(uint8_t spiRate) {
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// Use datarates Marlin uses
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uint32_t clock;
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switch (spiRate) {
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case SPI_FULL_SPEED: clock = 8000000; break;
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case SPI_HALF_SPEED: clock = 4000000; break;
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case SPI_QUARTER_SPEED: clock = 2000000; break;
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case SPI_EIGHTH_SPEED: clock = 1000000; break;
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case SPI_SIXTEENTH_SPEED: clock = 500000; break;
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case SPI_SPEED_5: clock = 250000; break;
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case SPI_SPEED_6: clock = 125000; break;
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default: clock = 4000000; break; // Default from the SPI library
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}
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spiConfig = SPISettings(clock, MSBFIRST, SPI_MODE0);
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sdSPI.begin();
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}
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/**
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* @brief Receives a single byte from the SPI port.
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*
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* @return Byte received
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*
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* @details
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*/
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uint8_t spiRec() {
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sdSPI.beginTransaction(spiConfig);
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uint8_t returnByte = sdSPI.transfer(0xFF);
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sdSPI.endTransaction();
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return returnByte;
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}
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/**
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* @brief Receives a number of bytes from the SPI port to a buffer
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*
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* @param buf Pointer to starting address of buffer to write to.
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* @param nbyte Number of bytes to receive.
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* @return Nothing
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*/
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void spiRead(uint8_t* buf, uint16_t nbyte) {
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if (nbyte == 0) return;
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memset(buf, 0xFF, nbyte);
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sdSPI.beginTransaction(spiConfig);
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sdSPI.transfer(buf, nbyte);
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sdSPI.endTransaction();
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}
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/**
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* @brief Sends a single byte on SPI port
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*
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* @param b Byte to send
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*
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* @details
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*/
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void spiSend(uint8_t b) {
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sdSPI.beginTransaction(spiConfig);
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sdSPI.transfer(b);
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sdSPI.endTransaction();
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}
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/**
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* @brief Write token and then write from 512 byte buffer to SPI (for SD card)
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*
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* @param buf Pointer with buffer start address
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* @return Nothing
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*
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* @details Uses DMA
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*/
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void spiSendBlock(uint8_t token, const uint8_t* buf) {
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sdSPI.beginTransaction(spiConfig);
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sdSPI.transfer(token);
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sdSPI.transfer((uint8_t*)buf, nullptr, 512);
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sdSPI.endTransaction();
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}
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void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) {
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spiConfig = SPISettings(spiClock, (BitOrder)bitOrder, dataMode);
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sdSPI.beginTransaction(spiConfig);
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}
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#endif // !SOFTWARE_SPI
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#endif // __SAMD51__
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