Firmware2/Marlin/src/HAL/HAL_AVR/HAL_spi_AVR.cpp

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/**
* Marlin 3D Printer Firmware
* Copyright (C) 2016 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 <http://www.gnu.org/licenses/>.
*
*/
/**
* Originally from Arduino Sd2Card Library
* Copyright (C) 2009 by William Greiman
*/
/**
* Description: HAL for AVR - SPI functions
*
* For __AVR__
*/
#ifdef __AVR__
// --------------------------------------------------------------------------
// Includes
// --------------------------------------------------------------------------
2017-09-06 13:28:32 +02:00
#include "../../inc/MarlinConfig.h"
// --------------------------------------------------------------------------
// Public Variables
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
// Public functions
// --------------------------------------------------------------------------
void spiBegin (void) {
SET_OUTPUT(SS_PIN);
WRITE(SS_PIN, HIGH);
SET_OUTPUT(SCK_PIN);
SET_INPUT(MISO_PIN);
SET_OUTPUT(MOSI_PIN);
#if DISABLED(SOFTWARE_SPI)
// SS must be in output mode even it is not chip select
SET_OUTPUT(SS_PIN);
// set SS high - may be chip select for another SPI device
#if SET_SPI_SS_HIGH
WRITE(SS_PIN, HIGH);
#endif // SET_SPI_SS_HIGH
// set a default rate
spiInit(1);
#endif // SOFTWARE_SPI
}
//------------------------------------------------------------------------------
#if DISABLED(SOFTWARE_SPI)
// functions for hardware SPI
//------------------------------------------------------------------------------
// make sure SPCR rate is in expected bits
#if (SPR0 != 0 || SPR1 != 1)
#error "unexpected SPCR bits"
#endif
/**
* Initialize hardware SPI
* Set SCK rate to F_CPU/pow(2, 1 + spiRate) for spiRate [0,6]
*/
void spiInit(uint8_t spiRate) {
// See avr processor documentation
CBI(
#ifdef PRR
PRR
#elif defined(PRR0)
PRR0
#endif
, PRSPI);
SPCR = _BV(SPE) | _BV(MSTR) | (spiRate >> 1);
SPSR = spiRate & 1 || spiRate == 6 ? 0 : _BV(SPI2X);
}
//------------------------------------------------------------------------------
/** SPI receive a byte */
uint8_t spiRec(void) {
SPDR = 0XFF;
while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
return SPDR;
}
//------------------------------------------------------------------------------
/** SPI read data */
void spiRead(uint8_t* buf, uint16_t nbyte) {
if (nbyte-- == 0) return;
SPDR = 0XFF;
for (uint16_t i = 0; i < nbyte; i++) {
while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
buf[i] = SPDR;
SPDR = 0XFF;
}
while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
buf[nbyte] = SPDR;
}
//------------------------------------------------------------------------------
/** SPI send a byte */
void spiSend(uint8_t b) {
SPDR = b;
while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
}
//------------------------------------------------------------------------------
/** SPI send block */
void spiSendBlock(uint8_t token, const uint8_t* buf) {
SPDR = token;
for (uint16_t i = 0; i < 512; i += 2) {
while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
SPDR = buf[i];
while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
SPDR = buf[i + 1];
}
while (!TEST(SPSR, SPIF)) { /* Intentionally left empty */ }
}
//------------------------------------------------------------------------------
#else // SOFTWARE_SPI
//------------------------------------------------------------------------------
/** nop to tune soft SPI timing */
#define nop asm volatile ("\tnop\n")
/** Set SPI rate */
void spiInit(uint8_t spiRate) {
// nothing to do
UNUSED(spiRate);
}
//------------------------------------------------------------------------------
/** Soft SPI receive byte */
uint8_t spiRec() {
uint8_t data = 0;
// no interrupts during byte receive - about 8 us
cli();
// output pin high - like sending 0XFF
WRITE(MOSI_PIN, HIGH);
for (uint8_t i = 0; i < 8; i++) {
WRITE(SCK_PIN, HIGH);
// adjust so SCK is nice
nop;
nop;
data <<= 1;
if (READ(MISO_PIN)) data |= 1;
WRITE(SCK_PIN, LOW);
}
// enable interrupts
sei();
return data;
}
//------------------------------------------------------------------------------
/** Soft SPI read data */
void spiRead(uint8_t* buf, uint16_t nbyte) {
for (uint16_t i = 0; i < nbyte; i++)
buf[i] = spiRec();
}
//------------------------------------------------------------------------------
/** Soft SPI send byte */
void spiSend(uint8_t data) {
// no interrupts during byte send - about 8 us
cli();
for (uint8_t i = 0; i < 8; i++) {
WRITE(SCK_PIN, LOW);
WRITE(MOSI_PIN, data & 0X80);
data <<= 1;
WRITE(SCK_PIN, HIGH);
}
// hold SCK high for a few ns
nop;
nop;
nop;
nop;
WRITE(SCK_PIN, LOW);
// enable interrupts
sei();
}
//------------------------------------------------------------------------------
/** Soft SPI send block */
void spiSendBlock(uint8_t token, const uint8_t* buf) {
spiSend(token);
for (uint16_t i = 0; i < 512; i++)
spiSend(buf[i]);
}
#endif // SOFTWARE_SPI
#endif // __AVR__