172 lines
4.3 KiB
C++
172 lines
4.3 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
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* Copyright (c) 2017 Victor Perez
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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 <https://www.gnu.org/licenses/>.
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*
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*/
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/**
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* Software SPI functions originally from Arduino Sd2Card Library
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* Copyright (c) 2009 by William Greiman
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* Adapted to the STM32F1 HAL
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*/
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#ifdef __STM32F1__
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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 ENABLED(SOFTWARE_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 STM32F1. Use hardware SPI."
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#else
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// ------------------------
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// Hardware SPI
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// ------------------------
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/**
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* VGPV SPI speed start and F_CPU/2, by default 72/2 = 36Mhz
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*/
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/**
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* @brief Begin SPI port setup
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*
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* @return Nothing
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*
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* @details Only configures SS pin since libmaple creates and initialize the SPI object
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*/
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void spiBegin() {
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#if PIN_EXISTS(SS)
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OUT_WRITE(SS_PIN, HIGH);
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#endif
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}
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/**
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* @brief Initialize SPI port to required speed rate and transfer mode (MSB, SPI MODE 0)
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*
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* @param spiRate Rate as declared in HAL.h (speed do not match AVR)
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* @return Nothing
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*
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* @details
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*/
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void spiInit(uint8_t spiRate) {
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/**
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* STM32F1 APB2 = 72MHz, APB1 = 36MHz, max SPI speed of this MCU if 18Mhz
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* STM32F1 has 3 SPI ports, SPI1 in APB2, SPI2/SPI3 in APB1
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* so the minimum prescale of SPI1 is DIV4, SPI2/SPI3 is DIV2
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*/
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#if SPI_DEVICE == 1
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#define SPI_CLOCK_MAX SPI_CLOCK_DIV4
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#else
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#define SPI_CLOCK_MAX SPI_CLOCK_DIV2
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#endif
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uint8_t clock;
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switch (spiRate) {
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case SPI_FULL_SPEED: clock = SPI_CLOCK_MAX ; break;
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case SPI_HALF_SPEED: clock = SPI_CLOCK_DIV4 ; break;
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case SPI_QUARTER_SPEED: clock = SPI_CLOCK_DIV8 ; break;
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case SPI_EIGHTH_SPEED: clock = SPI_CLOCK_DIV16; break;
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case SPI_SPEED_5: clock = SPI_CLOCK_DIV32; break;
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case SPI_SPEED_6: clock = SPI_CLOCK_DIV64; break;
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default: clock = SPI_CLOCK_DIV2; // Default from the SPI library
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}
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SPI.setModule(SPI_DEVICE);
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SPI.begin();
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SPI.setClockDivider(clock);
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SPI.setBitOrder(MSBFIRST);
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SPI.setDataMode(SPI_MODE0);
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}
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/**
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* @brief Receive 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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uint8_t returnByte = SPI.transfer(0xFF);
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return returnByte;
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}
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/**
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* @brief Receive 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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* @details Uses DMA
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*/
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void spiRead(uint8_t* buf, uint16_t nbyte) {
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SPI.dmaTransfer(0, const_cast<uint8_t*>(buf), nbyte);
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}
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/**
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* @brief Send 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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SPI.send(b);
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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 Use DMA
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*/
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void spiSendBlock(uint8_t token, const uint8_t* buf) {
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SPI.send(token);
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SPI.dmaSend(const_cast<uint8_t*>(buf), 512);
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}
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#if ENABLED(SPI_EEPROM)
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// Read single byte from specified SPI channel
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uint8_t spiRec(uint32_t chan) { return SPI.transfer(0xFF); }
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// Write single byte to specified SPI channel
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void spiSend(uint32_t chan, byte b) { SPI.send(b); }
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// Write buffer to specified SPI channel
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void spiSend(uint32_t chan, const uint8_t* buf, size_t n) {
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for (size_t p = 0; p < n; p++) spiSend(chan, buf[p]);
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}
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#endif // SPI_EEPROM
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#endif // SOFTWARE_SPI
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#endif // __STM32F1__
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