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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
* Copyright (c) 2017 Victor Perez
*
* 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/>.
*
*/
/**
* Software SPI functions originally from Arduino Sd2Card Library
* Copyright (c) 2009 by William Greiman
* Adapted to the STM32F1 HAL
*/
#ifdef __STM32F1__
#include "../../inc/MarlinConfig.h"
#include <SPI.h>
// ------------------------
// Public functions
// ------------------------
#if ENABLED(SOFTWARE_SPI)
// ------------------------
// Software SPI
// ------------------------
#error "Software SPI not supported for STM32F1. Use hardware SPI."
#else
// ------------------------
// Hardware SPI
// ------------------------
/**
* VGPV SPI speed start and F_CPU/2, by default 72/2 = 36Mhz
*/
/**
* @brief Begin SPI port setup
*
* @return Nothing
*
* @details Only configures SS pin since libmaple creates and initialize the SPI object
*/
void spiBegin() {
#if PIN_EXISTS(SD_SS)
OUT_WRITE(SD_SS_PIN, HIGH);
#endif
}
/**
* @brief Initialize SPI port to required speed rate and transfer mode (MSB, SPI MODE 0)
*
* @param spiRate Rate as declared in HAL.h (speed do not match AVR)
* @return Nothing
*
* @details
*/
void spiInit(uint8_t spiRate) {
/**
* STM32F1 APB2 = 72MHz, APB1 = 36MHz, max SPI speed of this MCU if 18Mhz
* STM32F1 has 3 SPI ports, SPI1 in APB2, SPI2/SPI3 in APB1
* so the minimum prescale of SPI1 is DIV4, SPI2/SPI3 is DIV2
*/
#if SPI_DEVICE == 1
#define SPI_CLOCK_MAX SPI_CLOCK_DIV4
#else
#define SPI_CLOCK_MAX SPI_CLOCK_DIV2
#endif
uint8_t clock;
switch (spiRate) {
case SPI_FULL_SPEED: clock = SPI_CLOCK_MAX ; break;
case SPI_HALF_SPEED: clock = SPI_CLOCK_DIV4 ; break;
case SPI_QUARTER_SPEED: clock = SPI_CLOCK_DIV8 ; break;
case SPI_EIGHTH_SPEED: clock = SPI_CLOCK_DIV16; break;
case SPI_SPEED_5: clock = SPI_CLOCK_DIV32; break;
case SPI_SPEED_6: clock = SPI_CLOCK_DIV64; break;
default: clock = SPI_CLOCK_DIV2; // Default from the SPI library
}
SPI.setModule(SPI_DEVICE);
SPI.begin();
SPI.setClockDivider(clock);
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE0);
}
/**
* @brief Receive a single byte from the SPI port.
*
* @return Byte received
*
* @details
*/
uint8_t spiRec() {
uint8_t returnByte = SPI.transfer(0xFF);
return returnByte;
}
/**
* @brief Receive 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
*
* @details Uses DMA
*/
void spiRead(uint8_t* buf, uint16_t nbyte) {
SPI.dmaTransfer(0, const_cast<uint8_t*>(buf), nbyte);
}
/**
* @brief Send a single byte on SPI port
*
* @param b Byte to send
*
* @details
*/
void spiSend(uint8_t b) {
SPI.send(b);
}
/**
* @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 Use DMA
*/
void spiSendBlock(uint8_t token, const uint8_t* buf) {
SPI.send(token);
SPI.dmaSend(const_cast<uint8_t*>(buf), 512);
}
#if ENABLED(SPI_EEPROM)
// Read single byte from specified SPI channel
uint8_t spiRec(uint32_t chan) { return SPI.transfer(0xFF); }
// Write single byte to specified SPI channel
void spiSend(uint32_t chan, byte b) { SPI.send(b); }
// Write buffer to specified SPI channel
void spiSend(uint32_t chan, const uint8_t* buf, size_t n) {
for (size_t p = 0; p < n; p++) spiSend(chan, buf[p]);
}
#endif // SPI_EEPROM
#endif // SOFTWARE_SPI
#endif // __STM32F1__
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