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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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