Version 1 (modified by 15 years ago) ( diff ) | ,
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MAX665
MAX6675.pde
#include "SPI.h" #define VCC 8 #define GND 9 #define SLAVE 10 void setup() { pinMode(GND, OUTPUT); pinMode(VCC, OUTPUT); digitalWrite(GND, LOW); digitalWrite(VCC, HIGH); Serial.begin(9600); SPI_Master.begin(SLAVE); } void loop() { int value; delay(500); SPI_Master.enable(SLAVE); value = SPI_Master.read() << 8; value |= SPI_Master.read(); SPI_Master.disable(); if ((value & 0x0004) != 0) Serial.println("Error"); else Serial.println((value >> 3) * 0.25); }
SPI.cpp
#include "SPI.h" boolean SPI_Master_Class::initialized_ = false; int SPI_Master_Class::enabled_ = -1; void SPI_Master_Class::begin(int slaveselecter) { if (!initialized_) { initialized_ = true; enabled_ = -1; pinMode(SS, OUTPUT); // Must be set as OUTPUT before SPE is asserted. pinMode(MOSI, OUTPUT); pinMode(MISO, INPUT); digitalWrite(MISO, HIGH); // Pull-up pinMode(SCK, OUTPUT); SPCR = (1<<SPE)|(1<<MSTR); // SPE: SPI Enable; MSTR: Master byte garbage; garbage = SPSR; garbage = SPDR; } if (slaveselecter != SS) pinMode(slaveselecter, OUTPUT); digitalWrite(slaveselecter, HIGH); // Disable } void SPI_Master_Class::enable(int slaveselecter) { disable(); digitalWrite(slaveselecter, LOW); enabled_ = slaveselecter; } void SPI_Master_Class::disable() { if (enabled_ >= 0) { digitalWrite(enabled_, HIGH); enabled_ = -1; } } byte SPI_Master_Class::write_and_read(byte data) const { SPDR = data; while (!(SPSR & (1<<SPIF))) ; return SPDR; } void SPI_Master_Class::write(byte data) const { write_and_read(data); } byte SPI_Master_Class::read() const { return write_and_read(0x00); } SPI_Master_Class SPI_Master;
SPI.h
#ifndef __SPI_H__ #define __SPI_H__ #include "WProgram.h" class SPI_Master_Class { public: static void begin(int slaveselecter); void enable(int slaveselecter); void disable(); byte write_and_read(byte data) const; void write(byte data) const; byte read() const; private: static boolean initialized_; static const int SS = 10; static const int MOSI = 11; static const int MISO = 12; static const int SCK = 13; static int enabled_; }; extern SPI_Master_Class SPI_Master; #endif //__SPI_H__
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