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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(SS)
- OUT_WRITE(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(ff);
- 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(ff); }
-
- // 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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