/**
* 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
*
* 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 .
*
*/
/**
* Software SPI functions originally from Arduino Sd2Card Library
* Copyright (c) 2009 by William Greiman
*/
/**
* For TARGET_LPC1768
*/
/**
* Hardware SPI and a software SPI implementations are included in this file.
* The hardware SPI runs faster and has higher throughput but is not compatible
* with some LCD interfaces/adapters.
*
* Control of the slave select pin(s) is handled by the calling routines.
*
* Some of the LCD interfaces/adapters result in the LCD SPI and the SD card
* SPI sharing pins. The SCK, MOSI & MISO pins can NOT be set/cleared with
* WRITE nor digitalWrite when the hardware SPI module within the LPC17xx is
* active. If any of these pins are shared then the software SPI must be used.
*
* A more sophisticated hardware SPI can be found at the following link. This
* implementation has not been fully debugged.
* https://github.com/MarlinFirmware/Marlin/tree/071c7a78f27078fd4aee9a3ef365fcf5e143531e
*/
#ifdef TARGET_LPC1768
#include "../../inc/MarlinConfig.h"
#include
// ------------------------
// Public functions
// ------------------------
#if ENABLED(LPC_SOFTWARE_SPI)
#include
// Software SPI
static uint8_t SPI_speed = 0;
static uint8_t spiTransfer(uint8_t b) {
return swSpiTransfer(b, SPI_speed, SCK_PIN, MISO_PIN, MOSI_PIN);
}
void spiBegin() {
swSpiBegin(SCK_PIN, MISO_PIN, MOSI_PIN);
}
void spiInit(uint8_t spiRate) {
SPI_speed = swSpiInit(spiRate, SCK_PIN, MOSI_PIN);
}
uint8_t spiRec() { return spiTransfer(0xFF); }
void spiRead(uint8_t*buf, uint16_t nbyte) {
for (int i = 0; i < nbyte; i++)
buf[i] = spiTransfer(0xFF);
}
void spiSend(uint8_t b) { (void)spiTransfer(b); }
void spiSend(const uint8_t* buf, size_t nbyte) {
for (uint16_t i = 0; i < nbyte; i++)
(void)spiTransfer(buf[i]);
}
void spiSendBlock(uint8_t token, const uint8_t* buf) {
(void)spiTransfer(token);
for (uint16_t i = 0; i < 512; i++)
(void)spiTransfer(buf[i]);
}
#else
// Hardware SPI
#include
#include
#include
// decide which HW SPI device to use
#ifndef LPC_HW_SPI_DEV
#if (SCK_PIN == P0_07 && MISO_PIN == P0_08 && MOSI_PIN == P0_09)
#define LPC_HW_SPI_DEV 1
#else
#if (SCK_PIN == P0_15 && MISO_PIN == P0_17 && MOSI_PIN == P0_18)
#define LPC_HW_SPI_DEV 0
#else
#error "Invalid pins selected for hardware SPI"
#endif
#endif
#endif
#if (LPC_HW_SPI_DEV == 0)
#define LPC_SSPn LPC_SSP0
#else
#define LPC_SSPn LPC_SSP1
#endif
void spiBegin() { // setup SCK, MOSI & MISO pins for SSP0
PINSEL_CFG_Type PinCfg; // data structure to hold init values
PinCfg.Funcnum = 2;
PinCfg.OpenDrain = 0;
PinCfg.Pinmode = 0;
PinCfg.Pinnum = LPC176x::pin_bit(SCK_PIN);
PinCfg.Portnum = LPC176x::pin_port(SCK_PIN);
PINSEL_ConfigPin(&PinCfg);
SET_OUTPUT(SCK_PIN);
PinCfg.Pinnum = LPC176x::pin_bit(MISO_PIN);
PinCfg.Portnum = LPC176x::pin_port(MISO_PIN);
PINSEL_ConfigPin(&PinCfg);
SET_INPUT(MISO_PIN);
PinCfg.Pinnum = LPC176x::pin_bit(MOSI_PIN);
PinCfg.Portnum = LPC176x::pin_port(MOSI_PIN);
PINSEL_ConfigPin(&PinCfg);
SET_OUTPUT(MOSI_PIN);
// divide PCLK by 2 for SSP0
CLKPWR_SetPCLKDiv(LPC_HW_SPI_DEV == 0 ? CLKPWR_PCLKSEL_SSP0 : CLKPWR_PCLKSEL_SSP1, CLKPWR_PCLKSEL_CCLK_DIV_2);
spiInit(0);
SSP_Cmd(LPC_SSPn, ENABLE); // start SSP running
}
void spiInit(uint8_t spiRate) {
// table to convert Marlin spiRates (0-5 plus default) into bit rates
uint32_t Marlin_speed[7]; // CPSR is always 2
Marlin_speed[0] = 8333333; //(SCR: 2) desired: 8,000,000 actual: 8,333,333 +4.2% SPI_FULL_SPEED
Marlin_speed[1] = 4166667; //(SCR: 5) desired: 4,000,000 actual: 4,166,667 +4.2% SPI_HALF_SPEED
Marlin_speed[2] = 2083333; //(SCR: 11) desired: 2,000,000 actual: 2,083,333 +4.2% SPI_QUARTER_SPEED
Marlin_speed[3] = 1000000; //(SCR: 24) desired: 1,000,000 actual: 1,000,000 SPI_EIGHTH_SPEED
Marlin_speed[4] = 500000; //(SCR: 49) desired: 500,000 actual: 500,000 SPI_SPEED_5
Marlin_speed[5] = 250000; //(SCR: 99) desired: 250,000 actual: 250,000 SPI_SPEED_6
Marlin_speed[6] = 125000; //(SCR:199) desired: 125,000 actual: 125,000 Default from HAL.h
// setup for SPI mode
SSP_CFG_Type HW_SPI_init; // data structure to hold init values
SSP_ConfigStructInit(&HW_SPI_init); // set values for SPI mode
HW_SPI_init.ClockRate = Marlin_speed[_MIN(spiRate, 6)]; // put in the specified bit rate
HW_SPI_init.Mode |= SSP_CR1_SSP_EN;
SSP_Init(LPC_SSPn, &HW_SPI_init); // puts the values into the proper bits in the SSP0 registers
}
static uint8_t doio(uint8_t b) {
/* send and receive a single byte */
SSP_SendData(LPC_SSPn, b & 0x00FF);
while (SSP_GetStatus(LPC_SSPn, SSP_STAT_BUSY)); // wait for it to finish
return SSP_ReceiveData(LPC_SSPn) & 0x00FF;
}
void spiSend(uint8_t b) { doio(b); }
void spiSend(const uint8_t* buf, size_t nbyte) {
for (uint16_t i = 0; i < nbyte; i++) doio(buf[i]);
}
void spiSend(uint32_t chan, byte b) {
}
void spiSend(uint32_t chan, const uint8_t* buf, size_t nbyte) {
}
// Read single byte from SPI
uint8_t spiRec() { return doio(0xFF); }
uint8_t spiRec(uint32_t chan) { return 0; }
// Read from SPI into buffer
void spiRead(uint8_t *buf, uint16_t nbyte) {
for (uint16_t i = 0; i < nbyte; i++) buf[i] = doio(0xFF);
}
static uint8_t spiTransfer(uint8_t b) {
return doio(b);
}
// Write from buffer to SPI
void spiSendBlock(uint8_t token, const uint8_t* buf) {
(void)spiTransfer(token);
for (uint16_t i = 0; i < 512; i++)
(void)spiTransfer(buf[i]);
}
/** Begin SPI transaction, set clock, bit order, data mode */
void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) {
// TODO: to be implemented
}
#endif // ENABLED(LPC_SOFTWARE_SPI)
void SPIClass::begin() { spiBegin(); }
void SPIClass::beginTransaction(SPISettings cfg) {
uint8_t spiRate;
switch (cfg.spiRate()) {
case 8000000: spiRate = 0; break;
case 4000000: spiRate = 1; break;
case 2000000: spiRate = 2; break;
case 1000000: spiRate = 3; break;
case 500000: spiRate = 4; break;
case 250000: spiRate = 5; break;
case 125000: spiRate = 6; break;
default: spiRate = 2; break;
}
spiInit(spiRate);
}
uint8_t SPIClass::transfer(const uint8_t B) { return spiTransfer(B); }
uint16_t SPIClass::transfer16(const uint16_t data) {
return (transfer((data >> 8) & 0xFF) << 8)
| (transfer(data & 0xFF) & 0xFF);
}
SPIClass SPI;
#endif // TARGET_LPC1768