Diff: Heater.cpp

Revision:

0:4e33cc8171f4

Child:

1:4435d407d827

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Heater.cpp	Wed Jul 17 07:54:07 2019 +0000
@@ -0,0 +1,50 @@
+/*------------------------------------------------------------------------------
+Library code file for interface to Heater
+Date: 16/07/2018
+
+
+------------------------------------------------------------------------------*/
+
+#include "Heater.h"
+#include "ADS8568_ADC.h"
+
+extern ADS8568_ADC adc;
+extern float scale_factors[8];
+extern Timer timer;
+extern int MEAS_DELAY;
+extern int N_ROLL_AVG;
+
+    
+Heater::Heater(int i_port, int v_port, DigitalOut drive, float R_set)
+    :i_port(i_port),v_port(v_port),drive(drive), R_set(R_set){}
+
+
+void Heater::read_R()
+{
+    adc.read_channels();
+    i = adc.read_channel_result(i_port)/scale_factors[i_port];
+    v = adc.read_channel_result(v_port)/scale_factors[v_port];
+    if (i != 0) R = v/i;
+}
+
+void Heater::hold(int hold_time)
+{
+    int end_time = timer.read_ms() + hold_time;
+    while (int time = timer.read_ms() < end_time)
+    {
+        drive = 1;
+        wait_us(MEAS_DELAY);
+        read_R();
+        while (float R_avg = ((N_ROLL_AVG-1)*R_avg + R)/N_ROLL_AVG > R_set)
+        {
+            drive = 0;
+            wait_us(MEAS_DELAY);
+            read_R();
+        }
+    }
+}    
+
+void Heater::Set_R_set(float R) {R_set = R;}
+
+float Heater::Get_R() {return R;}
+