124 lines
2.5 KiB
C++
124 lines
2.5 KiB
C++
#include <SPI.h>
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#define MODE 8
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#define CONTROL 9
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#define READ 0x08
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#define RESET 7
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byte inline bitchange(byte b)
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{
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byte z=0;
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if(b&0x8)
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{
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z|=0x10;
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}
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if(b&0x4)
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{
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z|=0x20;
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}
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if(b&0x2)
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{
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z|=0x40;
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}
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if(b&0x1)
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{
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z|=0x80;
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}
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z=b<<4;
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return z;
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}
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#define REG_WRITE_CTR bitchange(0x0)
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#define REG_WRITE_CMR bitchange(0x1)
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#define REG_WRITE_UAR1 bitchange(0x2)
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#define REG_WRITE_UAR2 bitchange(0x3)
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#define REG_WRITE_SAR1 bitchange(0x4)
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#define REG_WRITE_SAR2 bitchange(0x5)
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#define REG_WRITE_MCR bitchange(0x6)
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#define REG_WRITE_TBF bitchange(0xe)
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#define REG_READ_STR (bitchange(0x0)|READ)
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#define REG_READ_FLG (bitchange(0x1)|READ)
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#define REG_READ_RDR1 (bitchange(0x2)|READ)
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#define REG_READ_RDR2 (bitchange(0x3)|READ)
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#define REG_READ_LDR1 (bitchange(0x4)|READ)
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#define REG_READ_LDR2 (bitchange(0x5)|READ)
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#define REG_READ_DAR1 (bitchange(0x6)|READ)
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#define REG_READ_DAR2 (bitchange(0x7)|READ)
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#define REG_READ_RCR (bitchange(0x8)|READ)
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#define REG_READ_RBF (bitchange(0xe)|READ)
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void setup (void) {
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Serial.begin(9600); //set baud rate to 115200 for usart
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SPI.begin ();
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SPI.setClockDivider(SPI_CLOCK_DIV128);//divide the clock by 8
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pinMode(MODE,OUTPUT);
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pinMode(CONTROL,OUTPUT);
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pinMode(RESET, OUTPUT);
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digitalWrite(MODE, HIGH);
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digitalWrite(CONTROL, HIGH);
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digitalWrite(RESET, HIGH);
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digitalWrite(SS, LOW);
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}
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void loop (void) {
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byte addr = 0x0;
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byte data;
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SPI.beginTransaction(SPISettings(1000, MSBFIRST, SPI_MODE0));
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// set speed bit format and clock/data polarity while starting SPI transaction
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digitalWrite(CONTROL, HIGH);
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delay(5);
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SPI.transfer(REG_WRITE_CTR); // Register Select
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digitalWrite(CONTROL, LOW);
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delay(5);
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SPI.transfer(0x10); // read second 8 bits
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delay(5);
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// write the LTC CS pin low to initiate ADC sample and data transmit
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digitalWrite(CONTROL, HIGH);
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delay(5);
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SPI.transfer(REG_READ_FLG); // Register Select
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digitalWrite(CONTROL, LOW);
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delay(5);
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data = SPI.transfer(0x0); // read second 8 bits
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Serial.println(data); //0x2
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// wite LTC CS pin high to stop LTC from transmitting zeros.
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SPI.endTransaction();
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// close SPI transaction
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delay(250);
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// Delay that is fast but easy to read.
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// delayMicroseconds(83);
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// Delay that matches 12 khz delay time.
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}
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