File content as of revision 161:efd949e8d536:

#include "Device.h"

extern Device device;

void InitISACSOutputWithDefaults(void){
  device.isacs.output.settings.points = 2;
  //Control point 1.5 volt
  device.isacs.output.settings.voltage[0] = 0x00017fff;
  device.isacs.output.settings.code[0] = 800;
  //Control point 12.5 volt
  device.isacs.output.settings.voltage[1] = 0x000c7fff;
  device.isacs.output.settings.code[1] = 2048;
}

void InitISACSOutput(void){
  device.isacs.output.state.voltage = 0x000c7fff;
  isacsOutputCode();
}

void InitISACSRegulatorWithDefaults(void){
  device.isacs.regulator.settings.enabled = 1;
  //Startup settings
  device.isacs.regulator.settings.start.reference = 0x00020000; //Reference voltage 2V in 16.16 signed fixed point format
  device.isacs.regulator.settings.start.scale = 1; //Scale factor
  //Regular operation settings
  device.isacs.regulator.settings.regular.reference = 0x00020000; //Reference voltage 2V in 16.16 signed fixed point format
  device.isacs.regulator.settings.regular.scale = 1; //Scale factor
  //Reset operation settings
  device.isacs.regulator.settings.reset.reference = 0x00020000; //Reference voltage 2V in 16.16 signed fixed point format
  device.isacs.regulator.settings.reset.scale = 1; //Scale factor
  //Amplifier settings
  //device.isacs.amplifier.settings.reference = 0x00040000; //Reference voltage 4V in 16.16 signed fixed point format
  //device.isacs.amplifier.settings.gain = 1; //Scale factor
}

void InitISACSRegulator(void){
  device.isacs.regulator.state.enabled = device.isacs.regulator.settings.enabled;
  device.isacs.regulator.state.reference = device.isacs.regulator.settings.start.reference;
  device.isacs.regulator.state.scale = device.isacs.regulator.settings.start.scale;
}

void InitISACSWithDefaults(void){
  InitISACSOutputWithDefaults();
  InitISACSRegulatorWithDefaults();
  InitISACSPotentiometersWithDefaults();
}

void InitISACS(void){
  InitISACSOutput();
  InitISACSRegulator();
  InitISACSPotentiometers();
}

void StartISACS(void){
}

void isacsOutputCode(void) {
  uint32_t v1, v2;
  for (uint8_t i = 1; i < device.isacs.output.settings.points; i++) {
    v1 = device.isacs.output.settings.voltage[i - 1];
    if (device.isacs.output.state.voltage < v1) {
      device.isacs.output.state.code = device.isacs.output.settings.code[i - 1];
      device.isacs.output.state.voltage = v1;
      return;
    }

    v2 = device.isacs.output.settings.voltage[i];
    if (device.isacs.output.state.voltage < v2) {
      //max(c2 - c1) = 4096
      //max(v - v1) = 25V = 0x00190000;
      //max((c2 - c1) * (v - v1)) = 0x190000000
      //0x190000000 >> 2 = 0x64000000 < 0x80000000: ok
      uint32_t dv = (device.isacs.output.state.voltage - v1);
      uint32_t dvi = (v2 - v1);
      uint32_t c1 = device.isacs.output.settings.code[i - 1];
      uint32_t c2 = device.isacs.output.settings.code[i];
      uint32_t dc = c2 - c1;
      uint32_t m = 1;
      if (device.dac.settings.resolution > 16) {
        dv >>= 7; dc >>= 7; dvi >>= 7; m <<= 7;//For 24 bit: (21 - 7) + (24 - 7) - (21 - 7) + 7 = 24
      } else if (device.dac.settings.resolution > 12) {
        dv >>= 3; dc >>= 3; dvi >>= 3; m <<= 3;//For 16 bit: (21 - 3) + (16 - 3) - (21 - 3) + 3 = 16
      } else {
        dv >>= 1; dc >>= 1; dvi >>= 1; m <<= 1;//For 12 bit: (21 - 1) + (12 - 1) - (21 - 1) + 1 = 12
      }
      device.isacs.output.state.code = c1 + dv * dc / dvi * m;
      return;
    }
  }
  device.isacs.output.state.code = device.isacs.output.settings.code[device.isacs.output.settings.points - 1];
  device.isacs.output.state.voltage = device.isacs.output.settings.voltage[device.isacs.output.settings.points - 1];
}