HV PSU Control algo

HV set and ramp.ino

//upwards voltage ramp from 40V to 68.8V, takes approx 60 seconds to reach
//03 10 15 Jdevine
#include <SPI.h>
const int slaveAPin = 52;


void setup() {
pinMode (slaveAPin, OUTPUT);
digitalWrite(slaveAPin, LOW);
SPI.begin();

ramp(0x69);
}

void loop()
{
  

Serial.print("Looper");
stepset(0x60);
Serial.print("up");
stepset(0x70);
Serial.print("down");


}


void ramp(int target)
{
  //wait 100ms before ramp up
int currentval=0xFF;  
int difference = currentval - target;

for(int i = 0; i < difference; i++)
{
digitalWrite(slaveAPin, LOW);
SPI.beginTransaction(SPISettings(2000000, MSBFIRST, SPI_MODE0));
//digitalWrite(slaveAPin, LOW);
delay(200);
SPI.transfer(currentval);
delay(200);
//digitalWrite(slaveAPin, HIGH);
SPI.endTransaction();
digitalWrite(slaveAPin, HIGH);
currentval = currentval -1;
}
}

void stepset(int target)
{
  digitalWrite(slaveAPin, LOW);
SPI.beginTransaction(SPISettings(2000000, MSBFIRST, SPI_MODE0));
//digitalWrite(slaveAPin, LOW);
delay(300);
SPI.transfer(target);
delay(300);
//digitalWrite(slaveAPin, HIGH);
SPI.endTransaction();
digitalWrite(slaveAPin, HIGH);
}