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Marlin/src/HAL/STM32/HAL_SPI.cpp
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Marlin/src/HAL/STM32/HAL_SPI.cpp
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/**
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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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#if defined(ARDUINO_ARCH_STM32) && !defined(STM32GENERIC)
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#include "../../inc/MarlinConfig.h"
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#include <SPI.h>
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// ------------------------
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// Public Variables
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// ------------------------
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static SPISettings spiConfig;
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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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#include "../shared/Delay.h"
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void spiBegin(void) {
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OUT_WRITE(SD_SS_PIN, HIGH);
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OUT_WRITE(SD_SCK_PIN, HIGH);
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SET_INPUT(SD_MISO_PIN);
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OUT_WRITE(SD_MOSI_PIN, HIGH);
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}
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// Use function with compile-time value so we can actually reach the desired frequency
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// Need to adjust this a little bit: on a 72MHz clock, we have 14ns/clock
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// and we'll use ~3 cycles to jump to the method and going back, so it'll take ~40ns from the given clock here
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#define CALLING_COST_NS (3U * 1000000000U) / (F_CPU)
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void (*delaySPIFunc)();
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void delaySPI_125() { DELAY_NS(125 - CALLING_COST_NS); }
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void delaySPI_250() { DELAY_NS(250 - CALLING_COST_NS); }
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void delaySPI_500() { DELAY_NS(500 - CALLING_COST_NS); }
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void delaySPI_1000() { DELAY_NS(1000 - CALLING_COST_NS); }
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void delaySPI_2000() { DELAY_NS(2000 - CALLING_COST_NS); }
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void delaySPI_4000() { DELAY_NS(4000 - CALLING_COST_NS); }
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void spiInit(uint8_t spiRate) {
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// Use datarates Marlin uses
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switch (spiRate) {
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case SPI_FULL_SPEED: delaySPIFunc = &delaySPI_125; break; // desired: 8,000,000 actual: ~1.1M
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case SPI_HALF_SPEED: delaySPIFunc = &delaySPI_125; break; // desired: 4,000,000 actual: ~1.1M
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case SPI_QUARTER_SPEED:delaySPIFunc = &delaySPI_250; break; // desired: 2,000,000 actual: ~890K
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case SPI_EIGHTH_SPEED: delaySPIFunc = &delaySPI_500; break; // desired: 1,000,000 actual: ~590K
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case SPI_SPEED_5: delaySPIFunc = &delaySPI_1000; break; // desired: 500,000 actual: ~360K
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case SPI_SPEED_6: delaySPIFunc = &delaySPI_2000; break; // desired: 250,000 actual: ~210K
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default: delaySPIFunc = &delaySPI_4000; break; // desired: 125,000 actual: ~123K
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}
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SPI.begin();
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}
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// Begin SPI transaction, set clock, bit order, data mode
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void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) { /* do nothing */ }
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uint8_t HAL_SPI_STM32_SpiTransfer_Mode_3(uint8_t b) { // using Mode 3
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for (uint8_t bits = 8; bits--;) {
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WRITE(SD_SCK_PIN, LOW);
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WRITE(SD_MOSI_PIN, b & 0x80);
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delaySPIFunc();
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WRITE(SD_SCK_PIN, HIGH);
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delaySPIFunc();
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b <<= 1; // little setup time
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b |= (READ(SD_MISO_PIN) != 0);
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}
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DELAY_NS(125);
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return b;
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}
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// Soft SPI receive byte
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uint8_t spiRec() {
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DISABLE_ISRS(); // No interrupts during byte receive
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const uint8_t data = HAL_SPI_STM32_SpiTransfer_Mode_3(0xFF);
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ENABLE_ISRS(); // Enable interrupts
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return data;
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}
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// Soft SPI read data
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void spiRead(uint8_t *buf, uint16_t nbyte) {
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for (uint16_t i = 0; i < nbyte; i++)
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buf[i] = spiRec();
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}
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// Soft SPI send byte
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void spiSend(uint8_t data) {
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DISABLE_ISRS(); // No interrupts during byte send
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HAL_SPI_STM32_SpiTransfer_Mode_3(data); // Don't care what is received
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ENABLE_ISRS(); // Enable interrupts
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}
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// Soft SPI send block
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void spiSendBlock(uint8_t token, const uint8_t *buf) {
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spiSend(token);
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for (uint16_t i = 0; i < 512; i++)
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spiSend(buf[i]);
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}
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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 PCLK2/2, by default 108/2 = 54Mhz
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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 stm32duino creates and initialize the SPI object
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*/
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void spiBegin() {
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#if PIN_EXISTS(SD_SS)
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OUT_WRITE(SD_SS_PIN, HIGH);
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#endif
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}
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// Configure SPI for specified SPI speed
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void spiInit(uint8_t spiRate) {
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// Use datarates Marlin uses
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uint32_t clock;
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switch (spiRate) {
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case SPI_FULL_SPEED: clock = 20000000; break; // 13.9mhz=20000000 6.75mhz=10000000 3.38mhz=5000000 .833mhz=1000000
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case SPI_HALF_SPEED: clock = 5000000; break;
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case SPI_QUARTER_SPEED: clock = 2500000; break;
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case SPI_EIGHTH_SPEED: clock = 1250000; break;
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case SPI_SPEED_5: clock = 625000; break;
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case SPI_SPEED_6: clock = 300000; break;
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default:
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clock = 4000000; // Default from the SPI library
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}
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spiConfig = SPISettings(clock, MSBFIRST, SPI_MODE0);
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#if ENABLED(CUSTOM_SPI_PINS)
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SPI.setMISO(SD_MISO_PIN);
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SPI.setMOSI(SD_MOSI_PIN);
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SPI.setSCLK(SD_SCK_PIN);
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#endif
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SPI.begin();
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}
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/**
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* @brief Receives 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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if (nbyte == 0) return;
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memset(buf, 0xFF, nbyte);
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SPI.transfer(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.transfer(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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uint8_t rxBuf[512];
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SPI.transfer(token);
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SPI.transfer((uint8_t*)buf, &rxBuf, 512);
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}
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#endif // SOFTWARE_SPI
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#endif // ARDUINO_ARCH_STM32 && !STM32GENERIC
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