241 lines
7.5 KiB
C++
241 lines
7.5 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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*
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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 <http://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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*/
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/**
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* For TARGET_LPC1768
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*/
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/**
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* Hardware SPI and a software SPI implementations are included in this file.
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* The hardware SPI runs faster and has higher throughput but is not compatible
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* with some LCD interfaces/adapters.
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*
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* Control of the slave select pin(s) is handled by the calling routines.
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*
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* Some of the LCD interfaces/adapters result in the LCD SPI and the SD card
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* SPI sharing pins. The SCK, MOSI & MISO pins can NOT be set/cleared with
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* WRITE nor digitalWrite when the hardware SPI module within the LPC17xx is
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* active. If any of these pins are shared then the software SPI must be used.
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*
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* A more sophisticated hardware SPI can be found at the following link. This
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* implementation has not been fully debugged.
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* https://github.com/MarlinFirmware/Marlin/tree/071c7a78f27078fd4aee9a3ef365fcf5e143531e
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*/
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#ifdef TARGET_LPC1768
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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(LPC_SOFTWARE_SPI)
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#include <SoftwareSPI.h>
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// Software SPI
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static uint8_t SPI_speed = 0;
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static uint8_t spiTransfer(uint8_t b) {
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return swSpiTransfer(b, SPI_speed, SCK_PIN, MISO_PIN, MOSI_PIN);
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}
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void spiBegin() {
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swSpiBegin(SCK_PIN, MISO_PIN, MOSI_PIN);
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}
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void spiInit(uint8_t spiRate) {
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SPI_speed = swSpiInit(spiRate, SCK_PIN, MOSI_PIN);
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}
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uint8_t spiRec() { return spiTransfer(0xFF); }
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void spiRead(uint8_t*buf, uint16_t nbyte) {
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for (int i = 0; i < nbyte; i++)
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buf[i] = spiTransfer(0xFF);
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}
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void spiSend(uint8_t b) { (void)spiTransfer(b); }
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void spiSend(const uint8_t* buf, size_t nbyte) {
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for (uint16_t i = 0; i < nbyte; i++)
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(void)spiTransfer(buf[i]);
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}
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void spiSendBlock(uint8_t token, const uint8_t* buf) {
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(void)spiTransfer(token);
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for (uint16_t i = 0; i < 512; i++)
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(void)spiTransfer(buf[i]);
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}
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#else
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// Hardware SPI
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#include <lpc17xx_pinsel.h>
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#include <lpc17xx_ssp.h>
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#include <lpc17xx_clkpwr.h>
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// decide which HW SPI device to use
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#ifndef LPC_HW_SPI_DEV
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#if (SCK_PIN == P0_07 && MISO_PIN == P0_08 && MOSI_PIN == P0_09)
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#define LPC_HW_SPI_DEV 1
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#else
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#if (SCK_PIN == P0_15 && MISO_PIN == P0_17 && MOSI_PIN == P0_18)
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#define LPC_HW_SPI_DEV 0
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#else
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#error "Invalid pins selected for hardware SPI"
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#endif
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#endif
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#endif
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#if (LPC_HW_SPI_DEV == 0)
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#define LPC_SSPn LPC_SSP0
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#else
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#define LPC_SSPn LPC_SSP1
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#endif
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void spiBegin() { // setup SCK, MOSI & MISO pins for SSP0
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PINSEL_CFG_Type PinCfg; // data structure to hold init values
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PinCfg.Funcnum = 2;
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PinCfg.OpenDrain = 0;
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PinCfg.Pinmode = 0;
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PinCfg.Pinnum = LPC176x::pin_bit(SCK_PIN);
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PinCfg.Portnum = LPC176x::pin_port(SCK_PIN);
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PINSEL_ConfigPin(&PinCfg);
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SET_OUTPUT(SCK_PIN);
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PinCfg.Pinnum = LPC176x::pin_bit(MISO_PIN);
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PinCfg.Portnum = LPC176x::pin_port(MISO_PIN);
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PINSEL_ConfigPin(&PinCfg);
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SET_INPUT(MISO_PIN);
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PinCfg.Pinnum = LPC176x::pin_bit(MOSI_PIN);
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PinCfg.Portnum = LPC176x::pin_port(MOSI_PIN);
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PINSEL_ConfigPin(&PinCfg);
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SET_OUTPUT(MOSI_PIN);
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// divide PCLK by 2 for SSP0
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CLKPWR_SetPCLKDiv(LPC_HW_SPI_DEV == 0 ? CLKPWR_PCLKSEL_SSP0 : CLKPWR_PCLKSEL_SSP1, CLKPWR_PCLKSEL_CCLK_DIV_2);
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spiInit(0);
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SSP_Cmd(LPC_SSPn, ENABLE); // start SSP running
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}
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void spiInit(uint8_t spiRate) {
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// table to convert Marlin spiRates (0-5 plus default) into bit rates
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uint32_t Marlin_speed[7]; // CPSR is always 2
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Marlin_speed[0] = 8333333; //(SCR: 2) desired: 8,000,000 actual: 8,333,333 +4.2% SPI_FULL_SPEED
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Marlin_speed[1] = 4166667; //(SCR: 5) desired: 4,000,000 actual: 4,166,667 +4.2% SPI_HALF_SPEED
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Marlin_speed[2] = 2083333; //(SCR: 11) desired: 2,000,000 actual: 2,083,333 +4.2% SPI_QUARTER_SPEED
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Marlin_speed[3] = 1000000; //(SCR: 24) desired: 1,000,000 actual: 1,000,000 SPI_EIGHTH_SPEED
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Marlin_speed[4] = 500000; //(SCR: 49) desired: 500,000 actual: 500,000 SPI_SPEED_5
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Marlin_speed[5] = 250000; //(SCR: 99) desired: 250,000 actual: 250,000 SPI_SPEED_6
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Marlin_speed[6] = 125000; //(SCR:199) desired: 125,000 actual: 125,000 Default from HAL.h
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// setup for SPI mode
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SSP_CFG_Type HW_SPI_init; // data structure to hold init values
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SSP_ConfigStructInit(&HW_SPI_init); // set values for SPI mode
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HW_SPI_init.ClockRate = Marlin_speed[_MIN(spiRate, 6)]; // put in the specified bit rate
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HW_SPI_init.Mode |= SSP_CR1_SSP_EN;
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SSP_Init(LPC_SSPn, &HW_SPI_init); // puts the values into the proper bits in the SSP0 registers
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}
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static uint8_t doio(uint8_t b) {
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/* send and receive a single byte */
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SSP_SendData(LPC_SSPn, b & 0x00FF);
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while (SSP_GetStatus(LPC_SSPn, SSP_STAT_BUSY)); // wait for it to finish
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return SSP_ReceiveData(LPC_SSPn) & 0x00FF;
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}
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void spiSend(uint8_t b) { doio(b); }
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void spiSend(const uint8_t* buf, size_t nbyte) {
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for (uint16_t i = 0; i < nbyte; i++) doio(buf[i]);
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}
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void spiSend(uint32_t chan, byte b) {
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}
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void spiSend(uint32_t chan, const uint8_t* buf, size_t nbyte) {
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}
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// Read single byte from SPI
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uint8_t spiRec() { return doio(0xFF); }
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uint8_t spiRec(uint32_t chan) { return 0; }
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// Read from SPI into buffer
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void spiRead(uint8_t *buf, uint16_t nbyte) {
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for (uint16_t i = 0; i < nbyte; i++) buf[i] = doio(0xFF);
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}
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static uint8_t spiTransfer(uint8_t b) {
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return doio(b);
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}
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// Write from buffer to SPI
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void spiSendBlock(uint8_t token, const uint8_t* buf) {
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(void)spiTransfer(token);
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for (uint16_t i = 0; i < 512; i++)
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(void)spiTransfer(buf[i]);
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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) {
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// TODO: to be implemented
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}
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#endif // ENABLED(LPC_SOFTWARE_SPI)
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void SPIClass::begin() { spiBegin(); }
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void SPIClass::beginTransaction(SPISettings cfg) {
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uint8_t spiRate;
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switch (cfg.spiRate()) {
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case 8000000: spiRate = 0; break;
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case 4000000: spiRate = 1; break;
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case 2000000: spiRate = 2; break;
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case 1000000: spiRate = 3; break;
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case 500000: spiRate = 4; break;
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case 250000: spiRate = 5; break;
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case 125000: spiRate = 6; break;
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default: spiRate = 2; break;
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}
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spiInit(spiRate);
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}
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uint8_t SPIClass::transfer(const uint8_t B) { return spiTransfer(B); }
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uint16_t SPIClass::transfer16(const uint16_t data) {
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return (transfer((data >> 8) & 0xFF) << 8)
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| (transfer(data & 0xFF) & 0xFF);
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}
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SPIClass SPI;
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#endif // TARGET_LPC1768
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