Revision 3:b3fbff9ab12e, committed 2017-08-21

Comitter:

coreyharris

Date:

Mon Aug 21 14:18:36 2017 +0000

Parent:

2:5362460b01ef

Child:

4:4899e8165b98

Commit message:

New version with potentiometer. PORT0=+5V, PORT1=-5V, PORT9=ADC

Changed in this revision

--- a/main.cpp	Thu Aug 17 20:04:52 2017 +0000
+++ b/main.cpp	Mon Aug 21 14:18:36 2017 +0000
@@ -14,21 +14,18 @@
 
     MAX113XX_I2C * pixi;
     pixi = new MAX113XX_I2C(i2cBus, MAX113XX_I2C::MAX11301, 0x38, P5_5);
-    
+        
+    pixi->dacWrite(MAX113XX_Pixi::PORT0, 0x000);    // Pixi PORT0 is -5V
+    pixi->dacWrite(MAX113XX_Pixi::PORT1, 0xFFF);    // Pixi PORT1 is +5V
     
     uint16_t adcData, idx;
     float adcVoltage;
     while(1) {
-    
-        for(idx = 0; idx <= 0xFFF; idx++) {
-            pixi->dacWrite(MAX113XX_Pixi::PORT0, idx);                  // Write idx to PORT0          
-            pixi->singleEndedADCRead(MAX113XX_Pixi::PORT9, adcData);    // Read value from PORT9
-            adcVoltage = -5 + 2.442e-3  * adcData;                      // Convert ADC val to a voltage
-            pc.printf("ADC Voltage is %1.3f V, Count is 0x%x \r\n", adcVoltage, idx);  
-        }
         
-        pc.printf("\r\n\r\nSweep complete, starting new sweep\r\n\r\n");
-        wait(2.0);       
+        pixi->singleEndedADCRead(MAX113XX_Pixi::PORT9, adcData);    // Read value from PORT9
+        adcVoltage = -5 + 2.442e-3  * adcData;                      // Convert ADC val to a voltage
+        pc.printf("ADC Voltage is %1.3f V, Count is 0x%x \r\n", adcVoltage, idx);
+        wait(0.05);   
     }
 }