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/*
* Utils.cpp
*
* Created on: 28 Apr 2021
* Author: Ralim
*/
#include "BSP_Power.h"
#include "configuration.h"
#include <Utils.h>
int32_t Utils::InterpolateLookupTable(const int32_t *lookupTable, const int noItems, const int32_t value) {
for (int i = 1; i < (noItems - 1); i++) {
// If current tip temp is less than current lookup, then this current lookup is the higher point to interpolate
if (value < lookupTable[i * 2]) {
return LinearInterpolate(lookupTable[(i - 1) * 2], lookupTable[((i - 1) * 2) + 1], lookupTable[i * 2], lookupTable[(i * 2) + 1], value);
}
}
return LinearInterpolate(lookupTable[(noItems - 2) * 2], lookupTable[((noItems - 2) * 2) + 1], lookupTable[(noItems - 1) * 2], lookupTable[((noItems - 1) * 2) + 1], value);
}
int32_t Utils::LinearInterpolate(int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t x) { return y1 + (((((x - x1) * 1000) / (x2 - x1)) * (y2 - y1))) / 1000; }
uint16_t Utils::RequiredCurrentForTipAtVoltage(uint16_t voltageX10) {
uint8_t tipResistancex10 = getTipResistanceX10();
if (getSettingValue(SettingsOptions::USBPDMode) == usbpdMode_t::DEFAULT) {
tipResistancex10 += 5;
}
#ifdef MODEL_HAS_DCDC
// If this device has step down DC/DC inductor to smooth out current spikes
// We can instead ignore resistance and go for max voltage we can accept; and rely on the DC/DC regulation to keep under current limit
tipResistancex10 = 255; // (Push to 25.5 ohms to effectively disable this check)
#endif
// V/R = I
uint16_t currentX10 = (voltageX10 * 10) / tipResistancex10;
return currentX10;
}
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