254 lines
6.6 KiB
C++
254 lines
6.6 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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* Adapted 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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* HAL for AVR - SPI functions
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*/
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#ifdef __AVR__
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#include "../../inc/MarlinConfig.h"
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void spiBegin() {
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OUT_WRITE(SS_PIN, HIGH);
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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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#if DISABLED(SOFTWARE_SPI)
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// SS must be in output mode even it is not chip select
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//SET_OUTPUT(SS_PIN);
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// set SS high - may be chip select for another SPI device
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//#if SET_SPI_SS_HIGH
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//WRITE(SS_PIN, HIGH);
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//#endif
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// set a default rate
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spiInit(1);
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#endif
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}
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#if NONE(SOFTWARE_SPI, FORCE_SOFT_SPI)
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// ------------------------
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// Hardware SPI
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// ------------------------
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// make sure SPCR rate is in expected bits
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#if (SPR0 != 0 || SPR1 != 1)
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#error "unexpected SPCR bits"
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#endif
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/**
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* Initialize hardware SPI
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* Set SCK rate to F_CPU/pow(2, 1 + spiRate) for spiRate [0,6]
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*/
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void spiInit(uint8_t spiRate) {
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// See avr processor documentation
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CBI(
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#ifdef PRR
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PRR
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#elif defined(PRR0)
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PRR0
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#endif
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, PRSPI);
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SPCR = _BV(SPE) | _BV(MSTR) | (spiRate >> 1);
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SPSR = spiRate & 1 || spiRate == 6 ? 0 : _BV(SPI2X);
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}
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/** SPI receive a byte */
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uint8_t spiRec() {
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SPDR = 0xFF;
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while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
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return SPDR;
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}
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/** SPI read data */
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void spiRead(uint8_t* buf, uint16_t nbyte) {
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if (nbyte-- == 0) return;
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SPDR = 0xFF;
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for (uint16_t i = 0; i < nbyte; i++) {
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while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
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buf[i] = SPDR;
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SPDR = 0xFF;
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}
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while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
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buf[nbyte] = SPDR;
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}
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/** SPI send a byte */
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void spiSend(uint8_t b) {
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SPDR = b;
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while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
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}
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/** SPI send block */
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void spiSendBlock(uint8_t token, const uint8_t* buf) {
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SPDR = token;
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for (uint16_t i = 0; i < 512; i += 2) {
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while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
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SPDR = buf[i];
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while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
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SPDR = buf[i + 1];
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}
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while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
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}
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/** begin spi transaction */
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void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode) {
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// Based on Arduino SPI library
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// Clock settings are defined as follows. Note that this shows SPI2X
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// inverted, so the bits form increasing numbers. Also note that
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// fosc/64 appears twice
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// SPR1 SPR0 ~SPI2X Freq
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// 0 0 0 fosc/2
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// 0 0 1 fosc/4
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// 0 1 0 fosc/8
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// 0 1 1 fosc/16
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// 1 0 0 fosc/32
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// 1 0 1 fosc/64
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// 1 1 0 fosc/64
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// 1 1 1 fosc/128
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// We find the fastest clock that is less than or equal to the
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// given clock rate. The clock divider that results in clock_setting
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// is 2 ^^ (clock_div + 1). If nothing is slow enough, we'll use the
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// slowest (128 == 2 ^^ 7, so clock_div = 6).
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uint8_t clockDiv;
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// When the clock is known at compiletime, use this if-then-else
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// cascade, which the compiler knows how to completely optimize
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// away. When clock is not known, use a loop instead, which generates
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// shorter code.
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if (__builtin_constant_p(spiClock)) {
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if (spiClock >= F_CPU / 2) clockDiv = 0;
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else if (spiClock >= F_CPU / 4) clockDiv = 1;
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else if (spiClock >= F_CPU / 8) clockDiv = 2;
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else if (spiClock >= F_CPU / 16) clockDiv = 3;
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else if (spiClock >= F_CPU / 32) clockDiv = 4;
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else if (spiClock >= F_CPU / 64) clockDiv = 5;
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else clockDiv = 6;
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}
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else {
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uint32_t clockSetting = F_CPU / 2;
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clockDiv = 0;
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while (clockDiv < 6 && spiClock < clockSetting) {
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clockSetting /= 2;
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clockDiv++;
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}
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}
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// Compensate for the duplicate fosc/64
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if (clockDiv == 6) clockDiv = 7;
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// Invert the SPI2X bit
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clockDiv ^= 0x1;
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SPCR = _BV(SPE) | _BV(MSTR) | ((bitOrder == LSBFIRST) ? _BV(DORD) : 0) |
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(dataMode << CPHA) | ((clockDiv >> 1) << SPR0);
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SPSR = clockDiv | 0x01;
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}
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#else // SOFTWARE_SPI || FORCE_SOFT_SPI
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// ------------------------
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// Software SPI
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// ------------------------
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// nop to tune soft SPI timing
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#define nop asm volatile ("\tnop\n")
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void spiInit(uint8_t) { /* do nothing */ }
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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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// Soft SPI receive byte
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uint8_t spiRec() {
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uint8_t data = 0;
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// no interrupts during byte receive - about 8µs
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cli();
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// output pin high - like sending 0xFF
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WRITE(MOSI_PIN, HIGH);
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LOOP_L_N(i, 8) {
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WRITE(SCK_PIN, HIGH);
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nop; // adjust so SCK is nice
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nop;
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data <<= 1;
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if (READ(MISO_PIN)) data |= 1;
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WRITE(SCK_PIN, LOW);
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}
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sei();
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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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// no interrupts during byte send - about 8µs
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cli();
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LOOP_L_N(i, 8) {
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WRITE(SCK_PIN, LOW);
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WRITE(MOSI_PIN, data & 0x80);
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data <<= 1;
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WRITE(SCK_PIN, HIGH);
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}
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nop; // hold SCK high for a few ns
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nop;
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nop;
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nop;
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WRITE(SCK_PIN, LOW);
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sei();
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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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#endif // SOFTWARE_SPI || FORCE_SOFT_SPI
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#endif // __AVR__
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