Merge pull request #14 from cdagneta/feature/arcVoffset

Apply arc voltage offset to ADC readings

Author: terjeio

thc.c

@@ -187,7 +187,7 @@ static void set_target_voltage (float v)
 
 static void state_idle (void)
 {
- arc_voltage = (float)port.wait_on_input(Port_Analog, port_arc_voltage, WaitMode_Immediate, 0.0f) * plasma.arc_voltage_scale;
+ arc_voltage = ((float)port.wait_on_input(Port_Analog, port_arc_voltage, WaitMode_Immediate, 0.0f) * plasma.arc_voltage_scale) - plasma.arc_voltage_offset;
 }
 
 static void state_thc_delay (void)
@@ -198,7 +198,7 @@ static void state_thc_delay (void)
  stateHandler = state_thc_adjust;
  else {
  pidf_reset(&pid);
- set_target_voltage((float)port.wait_on_input(Port_Analog, port_arc_voltage, WaitMode_Immediate, 0.0f) * plasma.arc_voltage_scale);
+ set_target_voltage(((float)port.wait_on_input(Port_Analog, port_arc_voltage, WaitMode_Immediate, 0.0f) * plasma.arc_voltage_scale) - plasma.arc_voltage_offset);
  stateHandler = state_vad_lock;
  stateHandler();
  }
@@ -220,7 +220,7 @@ static void state_thc_adjust (void)
 
 static void state_vad_lock (void)
 {
- arc_voltage = (float)port.wait_on_input(Port_Analog, port_arc_voltage, WaitMode_Immediate, 0.0f) * plasma.arc_voltage_scale;
+ arc_voltage = ((float)port.wait_on_input(Port_Analog, port_arc_voltage, WaitMode_Immediate, 0.0f) * plasma.arc_voltage_scale) - plasma.arc_voltage_offset;
 
  if((thc.active = fr_actual >= fr_thr_99))
  stateHandler = state_thc_pid;
@@ -240,7 +240,7 @@ static void state_thc_pid (void)
  if(v_count == 0)
  v = 0.0f;
 
- arc_voltage = (float)port.wait_on_input(Port_Analog, port_arc_voltage, WaitMode_Immediate, 0.0f) * plasma.arc_voltage_scale;
+ arc_voltage = ((float)port.wait_on_input(Port_Analog, port_arc_voltage, WaitMode_Immediate, 0.0f) * plasma.arc_voltage_scale) - plasma.arc_voltage_offset;
  v += arc_voltage;
  if(++v_count == THC_SAMPLE_AVG) {