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Add software spi support for max6675

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This commit is contained in:
Paweł Stawicki
2017-01-08 17:08:50 +01:00
committed by Scott Lahteine
parent 191fec009f
commit 44cdebb8f1
3 changed files with 853 additions and 5 deletions
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20
Marlin/temperature.cpp
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@ -31,6 +31,7 @@
#include "temperature.h"
#include "thermistortables.h"
#include "language.h"
#include "spi.h"
#if ENABLED(BABYSTEPPING)
#include "stepper.h"
#endif
@ -942,6 +943,15 @@ void Temperature::updateTemperaturesFromRawValues() {
#endif
#if ENABLED(HEATER_0_USES_MAX6675)
#ifndef MAX6675_SCK_PIN
#define MAX6675_SCK_PIN SCK_PIN
#endif
#ifndef MAX6675_DO_PIN
#define MAX6675_DO_PIN MISO_PIN
#endif
Spi<MAX6675_DO_PIN, MOSI_PIN, MAX6675_SCK_PIN> max6675_spi;
#endif
/**
* Initialize the temperature manager
@ -1007,11 +1017,13 @@ void Temperature::init() {
OUT_WRITE(SCK_PIN, LOW);
OUT_WRITE(MOSI_PIN, HIGH);
SET_INPUT_PULLUP(MISO_PIN);
OUT_WRITE(SS_PIN, HIGH);
max6675_spi.init();
OUT_WRITE(SS_PIN, HIGH);
OUT_WRITE(MAX6675_SS, HIGH);
#endif //HEATER_0_USES_MAX6675
#endif // HEATER_0_USES_MAX6675
#ifdef DIDR2
#define ANALOG_SELECT(pin) do{ if (pin < 8) SBI(DIDR0, pin); else SBI(DIDR2, pin - 8); }while(0)
@ -1356,9 +1368,7 @@ void Temperature::disable_all_heaters() {
// Read a big-endian temperature value
max6675_temp = 0;
for (uint8_t i = sizeof(max6675_temp); i--;) {
SPDR = 0;
for (;!TEST(SPSR, SPIF););
max6675_temp |= SPDR;
max6675_temp |= max6675_spi.receive();
if (i > 0) max6675_temp <<= 8; // shift left if not the last byte
}