306 lines
9.2 KiB
C++
306 lines
9.2 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016, 2017 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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*
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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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// --------------------------------------------------------------------------
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// Includes
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// --------------------------------------------------------------------------
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//#include "../../../MarlinConfig.h" //works except in U8g
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#include "spi_pins.h"
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#include "fastio.h"
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// --------------------------------------------------------------------------
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// Public Variables
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// --------------------------------------------------------------------------
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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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// --------------------------------------------------------------------------
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// software SPI
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// --------------------------------------------------------------------------
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/**
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* This software SPI runs at three rates. The SD software provides an index
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* (spiRate) of 0-6. The mapping is:
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* 0-1 - about 5 MHz peak
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* 2-3 - about 2 MHz peak
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* all others - about 250 KHz
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*/
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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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if (!SPI_speed) { // fastest - about 5 MHz peak
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for (int bits = 0; bits < 8; bits++) {
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if (b & 0x80) {
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WRITE(MOSI_PIN, HIGH);
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WRITE(MOSI_PIN, HIGH); // delay to (hopefully) guarantee setup time
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}
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else {
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WRITE(MOSI_PIN, LOW);
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WRITE(MOSI_PIN, LOW); // delay to (hopefully) guarantee setup time
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}
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b <<= 1;
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WRITE(SCK_PIN, HIGH);
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if (READ(MISO_PIN)) {
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b |= 1;
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}
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WRITE(SCK_PIN, LOW);
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}
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}
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else if (SPI_speed == 1) { // medium - about 1 MHz
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for (int bits = 0; bits < 8; bits++) {
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if (b & 0x80) {
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for (uint8_t i = 0; i < 8; i++) WRITE(MOSI_PIN, HIGH);
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}
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else {
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for (uint8_t i = 0; i < 8; i++) WRITE(MOSI_PIN, LOW);
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}
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b <<= 1;
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for (uint8_t i = 0; i < 6; i++) WRITE(SCK_PIN, HIGH);
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if (READ(MISO_PIN)) {
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b |= 1;
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}
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WRITE(SCK_PIN, LOW);
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}
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}
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else { // slow - about 250 KHz
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for (int bits = 0; bits < 8; bits++) {
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if (b & 0x80) {
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WRITE(MOSI_PIN, HIGH);
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}
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else {
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WRITE(MOSI_PIN, LOW);
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}
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b <<= 1;
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delayMicroseconds(1U);
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WRITE(SCK_PIN, HIGH);
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delayMicroseconds(2U);
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if (READ(MISO_PIN)) {
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b |= 1;
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}
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WRITE(SCK_PIN, LOW);
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delayMicroseconds(1U);
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}
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}
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return b;
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}
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void spiBegin() {
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SET_OUTPUT(SCK_PIN);
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SET_INPUT(MISO_PIN);
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SET_OUTPUT(MOSI_PIN);
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}
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void spiInit(uint8_t spiRate) {
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SPI_speed = spiRate >> 1;
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WRITE(MOSI_PIN, HIGH);
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WRITE(SCK_PIN, LOW);
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}
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uint8_t spiRec() {
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uint8_t b = spiTransfer(0xff);
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return b;
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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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for (int i = 0; i < nbyte; i++) {
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buf[i] = spiTransfer(0xff);
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}
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}
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void spiSend(uint8_t b) {
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uint8_t response = spiTransfer(b);
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UNUSED(response);
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}
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static void spiSend(const uint8_t* buf, size_t n) {
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uint8_t response;
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if (n == 0) return;
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for (uint16_t i = 0; i < n; i++) {
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response = spiTransfer(buf[i]);
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}
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UNUSED(response);
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}
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void spiSendBlock(uint8_t token, const uint8_t* buf) {
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uint8_t response;
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response = spiTransfer(token);
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for (uint16_t i = 0; i < 512; i++) {
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response = spiTransfer(buf[i]);
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}
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UNUSED(response);
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WRITE(SS_PIN, HIGH);
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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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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 = pin_map[SCK_PIN].pin;
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PinCfg.Portnum = pin_map[SCK_PIN].port;
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PINSEL_ConfigPin(&PinCfg);
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SET_OUTPUT(SCK_PIN);
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PinCfg.Pinnum = pin_map[MISO_PIN].pin;
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PinCfg.Portnum = pin_map[MISO_PIN].port;
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PINSEL_ConfigPin(&PinCfg);
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SET_INPUT(MISO_PIN);
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PinCfg.Pinnum = pin_map[MOSI_PIN].pin;
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PinCfg.Portnum = pin_map[MOSI_PIN].port;
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PINSEL_ConfigPin(&PinCfg);
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SET_OUTPUT(MOSI_PIN);
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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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// select 50MHz PCLK for SSP0
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CLKPWR_SetPCLKDiv(CLKPWR_PCLKSEL_SSP0, CLKPWR_PCLKSEL_CCLK_DIV_2);
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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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SSP_Init(LPC_SSP0, &HW_SPI_init); // puts the values into the proper bits in the SSP0 registers
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SSP_Cmd(LPC_SSP0, ENABLE); // start SSP0 running
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}
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void spiSend(uint8_t b) {
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while (!SSP_GetStatus(LPC_SSP0, SSP_STAT_TXFIFO_NOTFULL)); // wait for room in the buffer
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SSP_SendData(LPC_SSP0, b & 0x00FF);
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while (SSP_GetStatus(LPC_SSP0, SSP_STAT_BUSY)); // wait for it to finish
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}
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void spiSend(const uint8_t* buf, size_t n) {
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if (n == 0) return;
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for (uint16_t i = 0; i < n; i++) {
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while (!SSP_GetStatus(LPC_SSP0, SSP_STAT_TXFIFO_NOTFULL)); // wait for room in the buffer
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SSP_SendData(LPC_SSP0, buf[i] & 0x00FF);
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}
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while (SSP_GetStatus(LPC_SSP0, SSP_STAT_BUSY)); // wait for it to finish
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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 n) {
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}
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uint8_t get_one_byte() {
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// send a dummy byte so can clock in receive data
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SSP_SendData(LPC_SSP0,0x00FF);
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while (SSP_GetStatus(LPC_SSP0, SSP_STAT_BUSY)); // wait for it to finish
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return SSP_ReceiveData(LPC_SSP0) & 0x00FF;
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}
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// Read single byte from SPI
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uint8_t spiRec() {
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while (SSP_GetStatus(LPC_SSP0, SSP_STAT_RXFIFO_NOTEMPTY) || SSP_GetStatus(LPC_SSP0, SSP_STAT_BUSY)) SSP_ReceiveData(LPC_SSP0); //flush the receive buffer
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return get_one_byte();
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}
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uint8_t spiRec(uint32_t chan) {
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return 0;
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}
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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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while (SSP_GetStatus(LPC_SSP0, SSP_STAT_RXFIFO_NOTEMPTY) || SSP_GetStatus(LPC_SSP0, SSP_STAT_BUSY)) SSP_ReceiveData(LPC_SSP0); //flush the receive buffer
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if (nbyte == 0) return;
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for (int i = 0; i < nbyte; i++) {
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buf[i] = get_one_byte();
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}
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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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}
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#endif // ENABLED(LPC_SOFTWARE_SPI)
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#endif // TARGET_LPC1768
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