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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/>.
- *
- */
- #if defined(ARDUINO_ARCH_STM32) && !defined(STM32GENERIC)
-
- #include "../../inc/MarlinConfig.h"
-
- #include <SPI.h>
-
- // ------------------------
- // Public Variables
- // ------------------------
-
- static SPISettings spiConfig;
-
- // ------------------------
- // Public functions
- // ------------------------
-
- #if ENABLED(SOFTWARE_SPI)
-
- // ------------------------
- // Software SPI
- // ------------------------
-
- #include "../shared/Delay.h"
-
- void spiBegin(void) {
- OUT_WRITE(SS_PIN, HIGH);
- OUT_WRITE(SCK_PIN, HIGH);
- SET_INPUT(MISO_PIN);
- OUT_WRITE(MOSI_PIN, HIGH);
- }
-
- static uint16_t delay_STM32_soft_spi;
-
- void spiInit(uint8_t spiRate) {
- // Use datarates Marlin uses
- switch (spiRate) {
- case SPI_FULL_SPEED: delay_STM32_soft_spi = 125; break; // desired: 8,000,000 actual: ~1.1M
- case SPI_HALF_SPEED: delay_STM32_soft_spi = 125; break; // desired: 4,000,000 actual: ~1.1M
- case SPI_QUARTER_SPEED:delay_STM32_soft_spi = 250; break; // desired: 2,000,000 actual: ~890K
- case SPI_EIGHTH_SPEED: delay_STM32_soft_spi = 500; break; // desired: 1,000,000 actual: ~590K
- case SPI_SPEED_5: delay_STM32_soft_spi = 1000; break; // desired: 500,000 actual: ~360K
- case SPI_SPEED_6: delay_STM32_soft_spi = 2000; break; // desired: 250,000 actual: ~210K
- default: delay_STM32_soft_spi = 4000; break; // desired: 125,000 actual: ~123K
- }
- SPI.begin();
- }
-
- // Begin SPI transaction, set clock, bit order, data mode
- void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) { /* do nothing */ }
-
- uint8_t HAL_SPI_STM32_SpiTransfer_Mode_3(uint8_t b) { // using Mode 3
- for (uint8_t bits = 8; bits--;) {
- WRITE(SCK_PIN, LOW);
- WRITE(MOSI_PIN, b & 0x80);
-
- DELAY_NS(delay_STM32_soft_spi);
- WRITE(SCK_PIN, HIGH);
- DELAY_NS(delay_STM32_soft_spi);
-
- b <<= 1; // little setup time
- b |= (READ(MISO_PIN) != 0);
- }
- DELAY_NS(125);
- return b;
- }
-
- // Soft SPI receive byte
- uint8_t spiRec() {
- DISABLE_ISRS(); // No interrupts during byte receive
- const uint8_t data = HAL_SPI_STM32_SpiTransfer_Mode_3(0xFF);
- ENABLE_ISRS(); // Enable interrupts
- return data;
- }
-
- // Soft SPI read data
- void spiRead(uint8_t *buf, uint16_t nbyte) {
- for (uint16_t i = 0; i < nbyte; i++)
- buf[i] = spiRec();
- }
-
- // Soft SPI send byte
- void spiSend(uint8_t data) {
- DISABLE_ISRS(); // No interrupts during byte send
- HAL_SPI_STM32_SpiTransfer_Mode_3(data); // Don't care what is received
- ENABLE_ISRS(); // Enable interrupts
- }
-
- // Soft SPI send block
- void spiSendBlock(uint8_t token, const uint8_t *buf) {
- spiSend(token);
- for (uint16_t i = 0; i < 512; i++)
- spiSend(buf[i]);
- }
-
- #else
-
- // ------------------------
- // Hardware SPI
- // ------------------------
-
- /**
- * VGPV SPI speed start and PCLK2/2, by default 108/2 = 54Mhz
- */
-
- /**
- * @brief Begin SPI port setup
- *
- * @return Nothing
- *
- * @details Only configures SS pin since stm32duino creates and initialize the SPI object
- */
- void spiBegin() {
- #if !PIN_EXISTS(SS)
- #error "SS_PIN not defined!"
- #endif
-
- OUT_WRITE(SS_PIN, HIGH);
- }
-
- // Configure SPI for specified SPI speed
- void spiInit(uint8_t spiRate) {
- // Use datarates Marlin uses
- uint32_t clock;
- switch (spiRate) {
- case SPI_FULL_SPEED: clock = 20000000; break; // 13.9mhz=20000000 6.75mhz=10000000 3.38mhz=5000000 .833mhz=1000000
- 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 = 300000; break;
- default:
- clock = 4000000; // Default from the SPI library
- }
- spiConfig = SPISettings(clock, MSBFIRST, SPI_MODE0);
-
- #if ENABLED(CUSTOM_SPI_PINS)
- SPI.setMISO(MISO_PIN);
- SPI.setMOSI(MOSI_PIN);
- SPI.setSCLK(SCK_PIN);
- SPI.setSSEL(SS_PIN);
- #endif
-
- SPI.begin();
- }
-
- /**
- * @brief Receives a single byte from the SPI port.
- *
- * @return Byte received
- *
- * @details
- */
- uint8_t spiRec() {
- SPI.beginTransaction(spiConfig);
- uint8_t returnByte = SPI.transfer(0xFF);
- SPI.endTransaction();
- 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) {
- if (nbyte == 0) return;
- memset(buf, 0xFF, nbyte);
- SPI.beginTransaction(spiConfig);
- SPI.transfer(buf, nbyte);
- SPI.endTransaction();
- }
-
- /**
- * @brief Send a single byte on SPI port
- *
- * @param b Byte to send
- *
- * @details
- */
- void spiSend(uint8_t b) {
- SPI.beginTransaction(spiConfig);
- SPI.transfer(b);
- SPI.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 Use DMA
- */
- void spiSendBlock(uint8_t token, const uint8_t* buf) {
- uint8_t rxBuf[512];
- SPI.beginTransaction(spiConfig);
- SPI.transfer(token);
- SPI.transfer((uint8_t*)buf, &rxBuf, 512);
- SPI.endTransaction();
- }
-
- #endif // SOFTWARE_SPI
-
- #endif // ARDUINO_ARCH_STM32 && !STM32GENERIC
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