some more adc code

ModbusThermometer.cpp

@@ -15,7 +15,7 @@ void setup() {
   
   pinMode(13, OUTPUT);
 
-  ads1210.begin(9);
+  ads1210.begin(9, 8);
   
 }
 
@@ -24,8 +24,7 @@ void loop() {
   delay(1000);              // wait for a second
   digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
   delay(1000);              // wait for a second
-  
-  Serial << "Tick" << endl;
-  ads1210.begin(9);
 
+  uint32_t adcValue = ads1210.get();
+  Serial << "AdcValue: " << adcValue << endl; 
 }

ads1210.cpp

@@ -9,6 +9,9 @@
 #include <SPI.h>
 #include "Streaming.h"
 #include "ads1210.h"
+#include "fatal.h"
+
+
 
 ADS1210::ADS1210() {
 }
@@ -20,68 +23,119 @@ void ADS1210::disableCS() const {
 	digitalWrite(m_csPin, HIGH);
 }
 
-void ADS1210::writeCMR () const {
-	uint8_t instr = INSR_MB1 | INSR_MB0 | ADDR_CMR3;
-	enableCS();
-	SPI.transfer(instr);
-	SPI.transfer(m_cmrWriteShadow[3]);
-	SPI.transfer(m_cmrWriteShadow[2]);
-	SPI.transfer(m_cmrWriteShadow[1]);
-	SPI.transfer(m_cmrWriteShadow[0]);
-	disableCS();
+void ADS1210::waitForDRdy() const {
+  uint32_t timeOut = 100000;
+  while ((0 != digitalRead(m_drdyPin)) && timeOut--) {
+  }
+  if (0 == timeOut) {
+    fatal(1);
+  } 
 }
 
-void ADS1210::readCMR () {
-	uint8_t instr = INSR_MB1 | INSR_MB0 | ADDR_CMR3 | INSR_RW;
-	enableCS();
-	SPI.transfer(instr);
-	m_cmrReadShadow[3] = SPI.transfer(0);
-	m_cmrReadShadow[2] = SPI.transfer(0);
-	m_cmrReadShadow[1] = SPI.transfer(0);
-	m_cmrReadShadow[0] = SPI.transfer(0);
-	disableCS();
+void waitForDRdyWOTimeout() const {
+  while (0 != digitalRead(m_drdyPin)) {
+  }
+}
+
+  
+void ADS1210::writeRegister(const uint8_t regAddr, const uint8_t value) const {
+  waitForDRdy();
+  enableCS();
+  SPI.transfer(regAddr);
+  SPI.transfer(value);
+  disableCS();  
 }
 
 
+uint8_t ADS1210::readRegister(const uint8_t regAddr) const {
+  uint8_t res;
+  
+  waitForDRdy();
+  enableCS();
+  SPI.transfer(regAddr | INSR_RW);
+  res = SPI.transfer(0);
+  disableCS();
+  
+  return res;
+}
 
-void ADS1210::begin(uint8_t csPin) {
+uint32_t ADS1210::readDataOutRegister() const {
+  union {
+    uint8_t in[4];
+    uint32_t out;
+  } res;
+  
+  waitForDRdy();
+  enableCS();
+  SPI.transfer(ADDR_DOR2 | INSR_MB1 | INSR_RW);
+  res.in[2] = SPI.transfer(); 
+  res.in[1] = SPI.transfer(); 
+  res.in[0] = SPI.transfer(); 
+  res.in[3] = 0;
+  disableCS();
+  
+  Serial << "DOR4x8:  " << _HEX(res.in[3]) << " " << _HEX(res.in[2]) << " " << _HEX(res.in[1]) << " " << _HEX(res.in[0]) << endl;
+  Serial << "DOR1x32: " << _HEX(res.out) << endl;
+  
+  return res.out;
+}
+
+
+void ADS1210::disableRefO() const {
+  uint8_t cmr = readRegister(ADDR_CMR3);
+  cmr &= ~CMR_REFO;
+  writeRegister(ADDR_CMR3, cmr);
+}
+
+void ADS1210::enableRefO() const {
+  uint8_t cmr = readRegister(ADDR_CMR3);
+  cmr |= CMR_REFO;
+  writeRegister(ADDR_CMR3, cmr);
+}
+
+void ADS1210::setMode(uint8_t mode) const {
+  uint8_t cmr = readRegister(ADDR_CMR2);
+  cmr &= ~CMR_MD_Mask;
+  cmr |= mode;
+  writeRegister(ADDR_CMR2, cmr);
+}
+
+void ADS1210::setGain(uint8_t gain) const {
+  uint8_t cmr = readRegister(ADDR_CMR2);
+  cmr &= ~CMR_Gain_Mask;
+  cmr |= gain;
+  writeRegister(ADDR_CMR2, cmr);
+}
+
+void ADS1210::begin(uint8_t csPin, uint8_t drdyPin) {
 	static bool onlyOnce = false;
 
 	m_csPin = csPin;
+	m_drdyPin = drdyPin;
 
 	// initialization of SPI
+  Serial << "Start SPI initialization ... ";
 	pinMode(m_csPin, OUTPUT);
 	digitalWrite(m_csPin, HIGH);
 	SPI.begin();
 	SPI.setBitOrder(MSBFIRST);
 	SPI.setClockDivider(SPI_CLOCK_DIV16);
 	SPI.setDataMode(SPI_MODE1);
+	Serial << "done." << endl;
 
-	if (! onlyOnce) {
-		// initialization of the ADS1210
-		m_cmrWriteShadow[3] |= CMR_SDL;
-		m_cmrWriteShadow[2] = 0;
-		m_cmrWriteShadow[1] = 0;
-		m_cmrWriteShadow[0] = 0;
-		writeCMR();
-		// onlyOnce = true;
-	}
-
-//	static bool toggleRefO = false;
-//	if (toggleRefO) {
-//		toggleRefO = false;
-//		m_cmrWriteShadow[3] |= CMR_REFO;
-//	} else {
-//		toggleRefO = true;
-//		m_cmrWriteShadow[3] &= ~CMR_REFO;
-//	}
-//	writeCMR();
-
-	readCMR();
-
-	Serial << "CMR3: " << _HEX(m_cmrReadShadow[3]) <<
-			", CMR2: " << _HEX(m_cmrReadShadow[2]) <<
-			", CMR1: " << _HEX(m_cmrReadShadow[1]) <<
-			", CMR0: " << _HEX(m_cmrReadShadow[0]) << endl;
+  // initialization of ADS1210
+  Serial << "Start ADS1210 initialization ... ";
+  pinMode(m_drdyPin, INPUT);
+  writeRegister(ADDR_CMR3, CMR_SDL | CMR_UB | CMR_REFO);
+  Serial << "done." << endl;
+    
+  Serial << "SelfCalibration ... ";
+  setMode(CMR_MD_SelfCalibration);
+  waitForDRdyWOTimeout();
+  Serial << "done." << endl;  
 }
 
+
+uint32_t ADS1210::get() const {
+  return readDataOutRegister();
+}

ads1210.h

@@ -11,8 +11,9 @@
 class ADS1210 {
 public:
 	ADS1210();
-	void begin(uint8_t csPin);
-	uint32_t get();
+	void begin(uint8_t csPin, uint8_t drdyPin);
+	uint32_t get() const;
+
 private:
 	// register addresses
 	const uint8_t ADDR_DOR2 = 0x00;
@@ -67,14 +68,20 @@ private:
 	const uint8_t INSR_ADDR = 0x0f;
 
 	uint8_t m_csPin;
+	uint8_t m_drdyPin;
 
-	uint8_t m_cmrReadShadow[4];
-	uint8_t m_cmrWriteShadow[4];
 
 	void enableCS() const;
 	void disableCS() const;
-	void writeCMR() const;
-	void readCMR();
+	void writeRegister(const uint8_t regAddr, const uint8_t value) const;
+	uint8_t readRegister(const uint8_t regAddr) const;
+	uint32_t readDataOutRegister() const;
+	void waitForDRdy() const;
+	void waitForDRdyWOTimeout() const;
+	void disableRefO() const;
+	void enableRefO() const;
+	void setMode(uint8_t mode) const;
+	void setGain(uint8_t gain) const;
 };
 
 

fatal.cpp

@@ -0,0 +1,9 @@
+#include "Streaming.h"
+#include "fatal.h"
+
+
+void fatal(uint8_t code) {
+  Serial << "Fatal: " << code << endl;
+  delay(1000);
+  while (true) ;
+}

fatal.h

@@ -0,0 +1,6 @@
+#ifndef _FATAL_H_
+#define _FATAL_H_
+
+void fatal(uint8_t code);
+
+#endif // _FATAL_H_