Revision 1:7e567e0adc6d, committed 2013-10-13

Comitter:

kosik84

Date:

Sun Oct 13 14:54:55 2013 +0000

Parent:

0:1116b0d151fc

Commit message:

It is simple to use PCF8591 Library (ADC / DAC converter) for LPC800MAX

Changed in this revision

--- a/PCF8591.cpp	Sat Sep 21 19:25:09 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,293 +0,0 @@
-/* PCF8591 - I2C 8 bit 4 channel A/D and 8 bit 1 channel D/A converter
- * Copyright (c) 2013 Wim Huiskamp
- *
- * Released under the MIT License: http://mbed.org/license/mit
- *
- * version 0.2 Initial Release
-*/
-#include "mbed.h"
-#include "PCF8591.h"
-
-
-/** Create a PCF8591 AD and DA object using a specified I2C bus and slaveaddress
-  *
-  * @param I2C &i2c the I2C port to connect to 
-  * @param char deviceAddress the address of the PCF8591
-  */  
-PCF8591::PCF8591(I2C *i2c, uint8_t deviceAddress) : _i2c(i2c) {
-    
-  _slaveAddress = deviceAddress;
-  _init(); 
-}
-
-
-#if(0)
-//These methods are disabled since they interfere with normal expected behaviour for mbed type Analog I/O
-//
-  
-/** Set ADC mode
-  *
-  * @param adc_mode      ADC Channel mode, valid Range (PCF8591_4S, PCF8591_3D, PCF8591_2S_1D, PCF8591_2D)
-  */  
-void PCF8591::setADCMode(uint8_t mode){
-  uint8_t data[6];
-  
-  _mode = _mode & ~PCF8591_2D; // Clear ADC mode bits
-  
-  switch (mode) {
-    case PCF8591_4S:
-                _mode = _mode | PCF8591_4S;
-                break; 
-    case PCF8591_3D:
-                _mode = _mode | PCF8591_3D;
-                break;    
-    case PCF8591_2S_1D:
-                _mode = _mode | PCF8591_2S_1D;
-                break;    
-    case PCF8591_2D:
-                _mode = _mode | PCF8591_2D;
-                break;    
-    default:
-                _mode = _mode | PCF8591_4S;    
-                break; 
-  }    
-        
-  data[0] = _mode;             // Control Reg
-  
-  // write data to the device
-  _i2c->write(_slaveAddress, (char*) data, 1);  
-   
-};
-
-/** Set DAC mode
-  *
-  * @param dac_mode      DAC Channel mode, valid Range (false=disable, true=enable)
-  */  
-void PCF8591::setDACMode(bool mode) {
-  uint8_t data[6];
-   
-  if (mode) 
-    _mode = _mode | PCF8591_AOUT;  // Enable DAC output
-  else
-    _mode = _mode & ~PCF8591_AOUT; // Disable DAC output
-
-  data[0] = _mode;             // Control Reg
-  
-  // write data to the device
-  _i2c->write(_slaveAddress, (char*) data, 1);  
-  
-};
-#endif
-
-
-/** Write Analog Output
-  *
-  * @param  analogOut  output value (0..255)
-  */  
-void PCF8591::write(uint8_t analogOut) {
-  uint8_t data[6];
-   
-  data[0] = _mode;             // Control Reg
-  data[1] = analogOut;         // DAC Channel
-  
-  // write data to the device
-  _i2c->write(_slaveAddress, (char*) data, 2);  
-};        
-
-/** Read Analog Channel 
-  *
-  * @param Channel   ADC channel, valid range PCF8591_ADC0, PCF8591_ADC1, PCF8591_ADC2 or PCF8591_ADC3
-  * @return value    uint8_t AD converted value (0..255, representing 0V..Vcc)   
-  */  
-#if(0)
-// I2C block operations test
-// Causes problems with Ticker and printf on LPC812. No issues found on LPC1768
-uint8_t PCF8591::read(uint8_t channel) {
-//  uint8_t data[6];
-  uint8_t data[6] = {123,123,123,123,123,123}; //test to check failed read
-    
-  _mode   = _mode & ~PCF8591_CHMSK;            // Clear ADC Channel bits
-  _mode   = _mode | (channel & PCF8591_CHMSK); // Set ADC Channel bits
-    
-  data[0] = _mode;             // Init Control Reg
-  
-  // write data to the device to select the ADC channel
-  _i2c->write(_slaveAddress, (char*) data, 1);  
- 
-  // read selected ADC channel
-  // note that first byte is a 'dummy' and should be ignored
-  _i2c->read(_slaveAddress, (char*) data, 2);  
-  return data[1];
-};
-
-#else
-// I2C single byte operations test
-// No issues found on LPC812
-uint8_t PCF8591::read(uint8_t channel) {
-  uint8_t data[6];
-//  uint8_t data[6] = {123,123,123,123,123,123}; //test to check failed read
-    
-  _mode   = _mode & ~PCF8591_CHMSK;            // Clear ADC Channel bits
-  _mode   = _mode | (channel & PCF8591_CHMSK); // Set ADC Channel bits
-    
-  data[0] = _mode;             // Init Control Reg
-  
-  // write data to the device to select the ADC channel
-  _i2c->start();  
-  _i2c->write(_slaveAddress);        // Slave write address 
-  _i2c->write(data[0]);  
-  _i2c->stop();  
-   
-  // read selected ADC channel
-  // note that first byte is a 'dummy' and should be ignored
-  _i2c->start();  
-  _i2c->write(_slaveAddress | 0x01); // Slave read address 
-  data[0]=_i2c->read(1);  //ack
-  data[1]=_i2c->read(0);  //nack  
-  _i2c->stop();  
-  
-  return data[1];
-};
-
-#endif
-
-
-/** Initialise AD and DA driver 
-  *
-  */  
-void PCF8591::_init() {
-  uint8_t data[6];
-  
-  _mode   = PCF8591_CTRL_DEF;  // Init mode
-  
-  data[0] = _mode;             // Init Control Reg
-  data[1] = 0x00;              // Init DAC Channel to 0
-  
-  // write data to the device
-  _i2c->write(_slaveAddress, (char*) data, 2);  
-}; 
-
-
-
-
-
-/** Create a PCF8591 AnalogOut object connected to the specified I2C bus and deviceAddress
- *
- */
-PCF8591_AnalogOut::PCF8591_AnalogOut(I2C *i2c, uint8_t deviceAddress) : _i2c(i2c) {
-    
-  _slaveAddress = deviceAddress;
-  _init(); 
-}
- 
-
-/** Write Analog Output
-  *
-  * @param  analogOut value (0 .. 1.0)
-  */  
-void PCF8591_AnalogOut::write(float analogOut) {
-  uint8_t data[6];
-
-  data[0] = _mode;             // Control Reg
-
-  // DAC Channel
-  if (analogOut < 0.0) data[1] = 0;
-  else if (analogOut >= 1.0) data[1] = 255;
-       else data[1] = uint8_t (analogOut * 255.0);      
-   
-  // write data to the device
-  _i2c->write(_slaveAddress, (char*) data, 2);  
-};        
-
-/** Operator = Analog Output
-  *
-  * @param  analogOut value (0.0f .. 1.0f)
-  */  
-PCF8591_AnalogOut& PCF8591_AnalogOut::operator= (float value){  
-  write(value);     
-  return *this;   
-}
- 
-
-/** Initialise DAC driver 
-  *
-  */  
-void PCF8591_AnalogOut::_init() {
-  uint8_t data[6];
-  
-  _mode   = PCF8591_CTRL_DEF;  // Init mode
-  
-  data[0] = _mode;             // Init Control Reg
-  data[1] = 0x00;              // Init DAC Channel to 0
-  
-  // write data to the device
-  _i2c->write(_slaveAddress, (char*) data, 2);  
-}; 
-
-
-
-/** Create a PCF8591 AnalogIn object connected to the specified I2C bus and deviceAddress
- *
- */
-PCF8591_AnalogIn::PCF8591_AnalogIn(I2C *i2c, uint8_t channel, uint8_t deviceAddress) : _i2c(i2c) {
-    
-  _slaveAddress = deviceAddress;
-  _channel = channel;  
-  _init(); 
-}
- 
-
-/** Read Analog input
-  *
-  * @return analogIn value (0 .. 1.0)
-  */  
-float PCF8591_AnalogIn::read() {
-  uint8_t data[6];
-    
-  data[0] = _mode;             // Init Control Reg
-  
-  // write data to the device to select the ADC channel
-  _i2c->start();  
-  _i2c->write(_slaveAddress);        // Slave write address 
-  _i2c->write(data[0]);  
-  _i2c->stop();  
-   
-  // read selected ADC channel
-  // note that first byte is a 'dummy' and should be ignored
-  _i2c->start();  
-  _i2c->write(_slaveAddress | 0x01); // Slave read address 
-  data[0]=_i2c->read(1);  //ack
-  data[1]=_i2c->read(0);  //nack  
-  _i2c->stop();  
-  
- 
-  // ADC Channel
-  return ((float) data[1] / 255.0);       
-  
-};
-
-
-/** Operator float Analog Input
-  *
-  * @return analogIn value (0 .. 1.0)
-  */  
-PCF8591_AnalogIn::operator float(){
-  return (read());    
-}
- 
-
-/** Initialise ADC driver 
-  *
-  */  
-void PCF8591_AnalogIn::_init() {
-  uint8_t data[6];
-  
-  _mode   = PCF8591_CTRL_DEF;  // Init mode
-  _mode   = _mode & ~PCF8591_CHMSK;             // Clear ADC Channel bits
-  _mode   = _mode | (_channel & PCF8591_CHMSK); // Set ADC Channel bits
-      
-  data[0] = _mode;             // Init Control Reg
-  
-  // write data to the device
-  _i2c->write(_slaveAddress, (char*) data, 1);  
-}; 

--- a/PCF8591.h	Sat Sep 21 19:25:09 2013 +0000
+++ b/PCF8591.h	Sun Oct 13 14:54:55 2013 +0000
@@ -1,221 +1,22 @@
-/* PCF8591 - I2C 8 bit, 4 channel A/D and 8 bit, 1 channel D/A converter
- * Copyright (c) 2013 Wim Huiskamp
- *
- * Released under the MIT License: http://mbed.org/license/mit
- *
- * version 0.2 Initial Release
-*/
-#ifndef _PCF8591_H
-#define _PCF8591_H
-
-/** Driver for PCF8591 I2C I2C A/D and D/A converter
- *
- * @code
- * #include "mbed.h"
- * #include "PCF8591.h"
- * 
- * // I2C Communication
- * I2C i2c_adcdac(p28,p27); // SDA, SCL for LPC1768
- * //I2C i2c_adcdac(P0_10,P0_11); // SDA, SCL for LPC812
- *
- * //Declare a composite ADC and DAC device that may be used through public methods
- * PCF8591 adc_dac(&i2c_adcdac); // I2C bus, Default PCF8591 Slaveaddress
- *
- * //Declare independent ADC and DAC objects that may be used similar to mbed AnalogIn and AnalogOut pins
- * //PCF8591_AnalogOut anaOut(&i2c_bus);
- * //
- * //PCF8591_AnalogIn anaIn(&i2c_bus, PCF8591_ADC0);
- *
- * 
- * int main() {
- *   uint8_t count = 0; 
- *   uint8_t analog;  
- *
- *   while(1) {
- *     wait(0.2);    
- *     count++;       
- *
- *     // Composite device methods    
- *     adc_dac.write(count);                 // write D/A value
- *     analog = adc_dac.read(PCF8591_ADC0);  // read A/D value for Channel 0
- * 
- *     // mbed pin type methods    
- *     //anaOut = (float)count / 255.0;        // write D/A value using range 0.0f .. 1.0f
- *     //analog = anaIn * 33.0;                // read A/D value for Channel 0 in (Volts*10)
- *   }
- *  
- * }
- * @endcode
- */
-
-
-//Address Defines for PCF8591
-#define PCF8591_SA0 0x90
-#define PCF8591_SA1 0x92
-#define PCF8591_SA2 0x94
-#define PCF8591_SA3 0x96
-#define PCF8591_SA4 0x98
-#define PCF8591_SA5 0x9A
-#define PCF8591_SA6 0x9C
-#define PCF8591_SA7 0x9E
-
-//Register Defines for PCF8591
-#define PCF8591_CTRL 0x00
-#define PCF8591_ADR0 0x01
-#define PCF8591_ADR1 0x02
-#define PCF8591_ADR2 0x03
-#define PCF8591_ADR3 0x04
-#define PCF8591_DAR  0x01
-
-//Control Register Defines for PCF8591
-//AD Channels
-#define PCF8591_ADC0 0x00
-#define PCF8591_ADC1 0x01
-#define PCF8591_ADC2 0x02
-#define PCF8591_ADC3 0x03
-//AD Channel Mask
-#define PCF8591_CHMSK   0x03
-
-//Auto Increment flag (0=disable, 1=enable)
-#define PCF8591_AIF  0x04
-
-//AD Channels Input modes
-//4 Single Channels (Chan0=AIN0, Chan1=AIN0, Chan2=AIN0, Chan3=AIN0)
-#define PCF8591_4S   0x00
-//3 Diff Channels (Chan0=AIN0-AIN3, Chan1=AIN1-AIN3, Chan2=AIN2-AIN3)
-#define PCF8591_3D   0x10
-//2 Single Channels (Chan0=AIN0, Chan1=AIN1)
-//1 Diff Channel    (Chan2=AIN2-AIN3)
-#define PCF8591_2S_1D 0x20
-//2 Diff Channels (Chan0=AIN0-AIN1, Chan1=AIN2-AIN3)
-#define PCF8591_2D   0x30
-//ChannelMode Mask
-#define PCF8591_CHMDMSK  0x30
-
-//Analog Output enable flag (0=disable, 1=enable)
-#define PCF8591_AOUT 0x40
-
-//Default Mode: ADC0, AutoIncr Off, 4 Single Chan, AnalogOut On
-#define PCF8591_CTRL_DEF (PCF8591_ADC0 | PCF8591_4S | PCF8591_AOUT)
+#include "mbed.h"
+#include "stdio.h"
 
 
-/** Create a PCF8591 object connected to the specified I2C bus and deviceAddress
- *
-*/
-class PCF8591 {
-public:
-  /** Create a PCF8591 AD and DA object using a specified I2C bus and slaveaddress
-   *
-   * @param I2C &i2c the I2C port to connect to 
-   * @param char deviceAddress the address of the PCF8591
-  */  
-  PCF8591(I2C *i2c, uint8_t deviceAddress = PCF8591_SA0);
-  
-#if(0)
-//These methods are disabled since they interfere with normal expected behaviour for mbed type Analog I/O
-//
-  /** Set ADC mode
-   *
-   * @param adc_mode      ADC Channel mode, valid Range (PCF8591_4S, PCF8591_3D, PCF8591_2S_1D, PCF8591_2D)
-  */  
-  void setADCMode(uint8_t mode);
+//init_adc(pin sda, pin scl, address, ADC mux, DAC value) return 1/0 (1-transmission ok)
 
-  /** Set DAC mode
-   *
-   * @param dac_mode      DAC Channel mode, valid Range (false=disable, true=enable)
-  */  
-  void setDACMode(bool mode);
-#endif
-
-/** Write Analog Output
-  *
-  * @param  analogOut  output value (0..255)
-  */  
-  void write(uint8_t analogOut);        
-
-/** Read Analog Channel 
-  *
-  * @param Channel   ADC channel, valid range PCF8591_ADC0, PCF8591_ADC1, PCF8591_ADC2 or PCF8591_ADC3
-  * @return value    uint8_t AD converted value (0..255, representing 0V..Vcc)   
-  */  
-  uint8_t read(uint8_t channel);
-
-
-  
-protected:
-  I2C *_i2c;                    //I2C bus reference
-  uint8_t _slaveAddress;        //I2C Slave address of device
-  uint8_t _mode;                //Device mode  
-
-/** Initialise AD and DA driver 
-  *
-  */  
-  void _init(); 
-};
-
+// adc(pin sda, pin scl, address, ADC mux) return ADC value
 
-/** Create a PCF8591 AnalogOut object connected to the specified I2C bus and deviceAddress
- *
-*/
-class PCF8591_AnalogOut {
-public:
-  /** Create a PCF8591 Analogout object using a specified I2C bus and slaveaddress
-   *
-   * @param I2C &i2c the I2C port to connect to 
-   * @param char deviceAddress the address of the PCF8591
-  */  
-  PCF8591_AnalogOut(I2C *i2c, uint8_t deviceAddress = PCF8591_SA0);
-
-  void write(float value);
-  #ifdef MBED_OPERATORS
-  /** An operator shorthand for write()
-   */ 
-  PCF8591_AnalogOut& operator= (float value);
-  #endif
-
-protected:
-  I2C *_i2c;                    //I2C bus reference
-  uint8_t _slaveAddress;        //I2C Slave address of device
-  uint8_t _mode;                //Device mode  
-
-/** Initialise DAC driver 
-  *
-  */  
-  void _init(); 
-};
-
+int init_adc (PinName sda, PinName scl,unsigned char addr, char mux,char dac_)
+{
+const char comm[] = {0x40+mux,dac_};
+I2C p_i2c(sda,scl);
+return(p_i2c.write(addr,comm,2));
+}
 
-/** Create a PCF8591 AnalogIn object connected to the specified I2C bus and deviceAddress
- *
-*/
-class PCF8591_AnalogIn {
-public:
-  /** Create a PCF8591 AnalogIn object using a specified I2C bus and slaveaddress
-   *
-   * @param I2C &i2c the I2C port to connect to 
-   * @param channel ADC channel of the PCF8591   
-   * @param char deviceAddress the address of the PCF8591
-  */  
-  PCF8591_AnalogIn(I2C *i2c, uint8_t channel, uint8_t deviceAddress = PCF8591_SA0);
-
-  float read();
-  #ifdef MBED_OPERATORS
-  /** An operator shorthand for read()
-   */ 
-  operator float();
-  #endif
-
-protected:
-  I2C *_i2c;                    //I2C bus reference
-  uint8_t _slaveAddress;        //I2C Slave address of device
-  uint8_t _mode;                //Device mode  
-  uint8_t _channel;             //Channel    
-
-/** Initialise DAC driver 
-  *
-  */  
-  void _init(); 
-};
-
-
-#endif
\ No newline at end of file
+int adc (PinName sda, PinName scl,char addr)
+{
+char response[1];
+I2C p_i2c(sda,scl);
+p_i2c.read((addr+0x01), response, 1);
+return(response[0]);
+}
\ No newline at end of file