Changeset 10109 for firmware/FSC/src/ad7719_adc.h

Timestamp:

01/19/11 15:44:25 (14 years ago)

Author:

lutz

Message:

niculin & dom debugged quite some stuff

File:

• firmware/FSC/src/ad7719_adc.h (modified) (2 diffs)

firmware/FSC/src/ad7719_adc.h

@@ -10 +10 @@
 #define ADC_RDY PD6
 #define ADC_RST PD7
-#define ADC_IS_READY() !(PIND & (1<<PD6)) // TRUE if PD6=0 AD_RDY is inverted logic.
+#define AD7719_IS_READY() (!(PIND & (1<<PD6))) // TRUE if PD6=0 AD_RDY is inverted logic.
 
 // Port Definitions
@@ -17 +17 @@
 #define ADC_PIN PIND
 
-void adc_init(void);
-void startconv(void);
+
+// ON CHIP REGISTER ADDRESSES
+#define STATUS_RD 0x40
+
+#define MODE_WR 0x01
+#define MODE_RD 0x41
+
+#define AD0CON_WR 0x02
+#define AD0CON_RD 0x42
+
+#define AD1CON_WR 0x03
+#define AD1CON_RD 0x43
+
+#define FILTER_WR 0x04
+#define FILTER_RD 0x44
+
+#define AD0DAT_RD 0x45
+#define AD1DAT_RD 0x46
+
+#define IOCON_WR 0x07
+#define IOCON_RD 0x47
+
+#define AD0OFS_WR 0x08
+#define AD0OFS_RD 0x48
+
+#define AD1OFS_WR 0x09
+#define AD1OFS_RD 0x49
+
+#define AD0GAIN_WR 0x0A
+#define AD0GAIN_RD 0x4A
+
+#define AD1GAIN_WR 0x0B
+#define AD1GAIN_RD 0x4B
+
+#define ID_RD 0x4F
+
+// REGISTER INIT VALUES
+
+        //Init Configure and Initialize AD7719
+        //http://designtools.analog.com/dt/adc/codegen/ad7719.html 
+
+#define IOCON_INIT_HIGH 0x03    //0000.0011 // I-sources I1 and I2 are switched on, thats all
+#define IOCON_INIT_LOWBYTE 0x00
+
+#define FILTER_INIT 0x52        //0x52 euro use 50Hz = -171dB and 60Hz = -58dB Rejectjon Updaterate = 4Hz
+                                                                                        // 0x52=82 decimal. f_ADC=16.6Hz; t_ADC=60ms; t_settle = 120ms
+
+#define AD1CON_INIT 0x31        //0011.0001     
+        // AD1EN is set --> AUX ADc is used for Temp measurement.
+        // ACH = 011 --> Tempsensor
+        // U/#B = 0 --> bipolar, but i'm not entirely sure if this is correct.
+        // ARN = 1 --> input range is REFIN2 , but when tempsensor is chosen, internal ref is used ... 
+
+#define AD0CON_INIT 0x8E // 1000.1110
+        // AD0EN is set
+        // WL is cleared --> 24bit
+        // CH = 00 --> AIN1 , AIN2 used 
+        // U/#B = 1 --> unipolar
+        // RN=110 --> input range = +-1.28V --> whatever this means in ratiometric measurements.
+
+
+#define MODE_IDLE 0x01
+#define MODE_SINGLE 0x02
+#define MODE_CONT 0x03
+#define MODE_INTERNAL_ZERO_CAL 0x04             // not tested
+#define MODE_INTERNAL_FULL_CAL 0x05             // not tested
+
+// since the ADC is chopped, one should wait 3 conversions
+// after the muxer was switched, until the reading is okay.
+#define READINGS_UNTIL_AD7719_SETTLED 3
+
+void ad7719_init(void);
+void startconv(U08 continuous);
+void stopconv(void);
 U32 read_adc(void);
 //-----------------------------------------------------------------------------