saves config to flash

m4/src/Peripherals/DAC/DACChannel.h

@@ -5,6 +5,9 @@
 
 #include "Config.h"
 
+#include "KVStore.h"
+#include "kvstore_global_api.h"
+
 class DACChannel {
  private:
   float gain_error;
@@ -36,6 +39,18 @@ class DACChannel {
     digitalWrite(cs_pin, HIGH);
     commsController.endSingleTransaction();
     setVoltage(0.0);
+
+    char offsetKey[14];
+    char gainKey[12];
+    sprintf(offsetKey, "offsetError%d", cs_pin);
+    sprintf(gainKey, "gainError%d", cs_pin);
+    float offset;
+    kv_get(offsetKey, (uint8_t*)&offset, sizeof(offsetKey) , 0);
+    float gain;
+    kv_get(gainKey, (uint8_t*)&gain, sizeof(gain) , 0);
+
+    this->offset_error = offset;
+    this->gain_error = gain;
   }
 
   // initialize is the command INITIALIZE, setup is called in main::setup
@@ -86,8 +101,16 @@ class DACChannel {
   }
 
   void setCalibration(float offset, float gain) {
+    char offsetKey[14];
+    char gainKey[12];
+    sprintf(offsetKey, "offsetError%d", cs_pin);
+    sprintf(gainKey, "gainError%d", cs_pin);
+    kv_set(offsetKey, (uint8_t*)&offset_error, sizeof(offset), 0);
+    kv_set(gainKey, (uint8_t*)&gain_error, sizeof(gain), 0);
     this->offset_error = offset;
     this->gain_error = gain;
+    voltage_upper_bound = full_scale * gain_error + offset_error;
+    voltage_lower_bound = -full_scale * gain_error + offset_error;
   }
 
   void setFullScale(float full_scale) {