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101 lines
2.4 KiB
C++
101 lines
2.4 KiB
C++
/*
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SPI.cpp - SPI library for esp8266
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Copyright (c) 2015 Hristo Gochkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "SPI.h"
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SPIClass SPI;
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SPIClass::SPIClass(){}
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void SPIClass::begin(){
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pinMode(SCK, SPECIAL);
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pinMode(MISO, SPECIAL);
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pinMode(MOSI, SPECIAL);
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GPMUX = 0x105;
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SPI1C = 0;
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SPI1CLK = SPI_CLOCK_DIV16;//1MHz
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SPI1U = SPIUMOSI | SPIUDUPLEX | SPIUSSE;
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SPI1U1 = (7 << SPILMOSI) | (7 << SPILMISO);
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SPI1C1 = 0;
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}
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void SPIClass::end() {
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pinMode(SCK, INPUT);
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pinMode(MISO, INPUT);
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pinMode(MOSI, INPUT);
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}
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void SPIClass::beginTransaction(SPISettings settings) {
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setClockDivider(settings._clock);
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setBitOrder(settings._bitOrder);
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setDataMode(settings._dataMode);
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}
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void SPIClass::endTransaction() {}
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void SPIClass::setDataMode(uint8_t dataMode) {
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}
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void SPIClass::setBitOrder(uint8_t bitOrder) {
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if (bitOrder == MSBFIRST) {
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SPI1C &= ~(SPICWBO | SPICRBO);
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} else {
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SPI1C |= (SPICWBO | SPICRBO);
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}
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}
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void SPIClass::setClockDivider(uint32_t clockDiv) {
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SPI1CLK = clockDiv;
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}
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uint8_t SPIClass::transfer(uint8_t data) {
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while(SPI1CMD & SPIBUSY);
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SPI1W0 = data;
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SPI1CMD |= SPIBUSY;
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while(SPI1CMD & SPIBUSY);
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return (uint8_t)(SPI1W0 & 0xff);
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}
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uint16_t SPIClass::transfer16(uint16_t data) {
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union {
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uint16_t val;
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struct {
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uint8_t lsb;
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uint8_t msb;
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};
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} in, out;
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in.val = data;
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if((SPI1C & (SPICWBO | SPICRBO))) {
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//MSBFIRST
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out.msb = transfer(in.msb);
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out.lsb = transfer(in.lsb);
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} else {
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//LSBFIRST
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out.lsb = transfer(in.lsb);
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out.msb = transfer(in.msb);
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}
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return out.val;
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}
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