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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 <https://www.gnu.org/licenses/>.
*
*/
#ifdef __MK20DX256__
#include "HAL.h"
#include <SPI.h>
#include <pins_arduino.h>
#include "spi_pins.h"
#include "../../core/macros.h"
static SPISettings spiConfig;
/**
* Standard SPI functions
*/
// Initialize SPI bus
void spiBegin() {
#if !PIN_EXISTS(SD_SS)
#error "SD_SS_PIN not defined!"
#endif
OUT_WRITE(SD_SS_PIN, HIGH);
SET_OUTPUT(SD_SCK_PIN);
SET_INPUT(SD_MISO_PIN);
SET_OUTPUT(SD_MOSI_PIN);
#if 0 && DISABLED(SOFTWARE_SPI)
// set SS high - may be chip select for another SPI device
#if SET_SPI_SS_HIGH
WRITE(SD_SS_PIN, HIGH);
#endif
// set a default rate
spiInit(SPI_HALF_SPEED); // 1
#endif
}
// Configure SPI for specified SPI speed
void spiInit(uint8_t spiRate) {
// Use data rates Marlin uses
uint32_t clock;
switch (spiRate) {
case SPI_FULL_SPEED: clock = 10000000; break;
case SPI_HALF_SPEED: clock = 5000000; break;
case SPI_QUARTER_SPEED: clock = 2500000; break;
case SPI_EIGHTH_SPEED: clock = 1250000; break;
case SPI_SPEED_5: clock = 625000; break;
case SPI_SPEED_6: clock = 312500; break;
default: clock = 4000000; // Default from the SPI libarary
}
spiConfig = SPISettings(clock, MSBFIRST, SPI_MODE0);
SPI.begin();
}
// SPI receive a byte
uint8_t spiRec() {
SPI.beginTransaction(spiConfig);
const uint8_t returnByte = SPI.transfer(0xFF);
SPI.endTransaction();
return returnByte;
//SPDR = 0xFF;
//while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
//return SPDR;
}
// SPI read data
void spiRead(uint8_t* buf, uint16_t nbyte) {
SPI.beginTransaction(spiConfig);
SPI.transfer(buf, nbyte);
SPI.endTransaction();
//if (nbyte-- == 0) return;
// SPDR = 0xFF;
//for (uint16_t i = 0; i < nbyte; i++) {
// while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
// buf[i] = SPDR;
// SPDR = 0xFF;
//}
//while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
//buf[nbyte] = SPDR;
}
// SPI send a byte
void spiSend(uint8_t b) {
SPI.beginTransaction(spiConfig);
SPI.transfer(b);
SPI.endTransaction();
//SPDR = b;
//while (!TEST(SPSR, SPIF)) { /* nada */ }
}
// SPI send block
void spiSendBlock(uint8_t token, const uint8_t* buf) {
SPI.beginTransaction(spiConfig);
SPDR = token;
for (uint16_t i = 0; i < 512; i += 2) {
while (!TEST(SPSR, SPIF)) { /* nada */ };
SPDR = buf[i];
while (!TEST(SPSR, SPIF)) { /* nada */ };
SPDR = buf[i + 1];
}
while (!TEST(SPSR, SPIF)) { /* nada */ };
SPI.endTransaction();
}
// Begin SPI transaction, set clock, bit order, data mode
void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) {
spiConfig = SPISettings(spiClock, bitOrder, dataMode);
SPI.beginTransaction(spiConfig);
}
#endif // __MK20DX256__
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