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Scratch out resistance awareness of the tip

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This commit is contained in:
Ben V. Brown
2022-05-23 22:25:00 +10:00
parent 75b3f09438
commit 9decdcc89c
3 changed files with 27 additions and 7 deletions
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29
source/Core/BSP/Magic/BSP.cpp
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@@ -6,10 +6,12 @@
#include "Pins.h"
#include "Setup.h"
#include "TipThermoModel.h"
#include "USBPD.h"
#include "configuration.h"
#include "history.hpp"
#include "main.hpp"
// These control the period's of time used for the PWM
const uint16_t powerPWM = 255;
const uint8_t holdoffTicks = 5; // This is the tick delay
@@ -224,7 +226,7 @@ void setStatusLED(const enum StatusLED state) {
// Dont have one
}
uint8_t lastTipResistance = 75; // default safe
uint8_t lastTipResistance = 80; // default safe
uint32_t lastTipReadinguV = 0;
uint8_t getTipResitanceX10() {
// Return tip resistance in x10 ohms
@@ -241,9 +243,10 @@ void startMeasureTipResistance() {
// If tip is connected, and the tip is cold and the tip is not being heated
// We can use the GPIO to inject a small current into the tip and measure this
// The gpio is 5.1k -> diode -> tip -> gnd
// Which is around 0.65mA this will induce:
// 6 ohm tip -> 3.9mV (Real world ~= 3320)
// 8 ohm tip -> 5.2mV (Real world ~= 4500)
// Source is 3.3V-0.5V
// Which is around 0.54mA this will induce:
// 6 ohm tip -> 3.24mV (Real world ~= 3320)
// 8 ohm tip -> 4.32mV (Real world ~= 4500)
// Which is definitely measureable
// Taking shortcuts here as we know we only really have to pick apart 6 and 8 ohm tips
// These are reported as 60 and 75 respectively
@@ -263,7 +266,21 @@ void FinishMeasureTipResistance() {
return;
}
// newReading -= lastTipReadinguV;
MSG("Tip Delta %lu, %lu %lu \r\n", newReading - lastTipReadinguV, newReading, lastTipReadinguV);
// MSG("Tip Delta %lu, %lu %lu \r\n", newReading - lastTipReadinguV, newReading, lastTipReadinguV);
newReading -= lastTipReadinguV;
lastTipReadinguV = newReading;
// As we are only detecting two resistances; we can split the difference for now
uint8_t newRes = 0;
if (newReading > 5000) {
return; // Change nothing as probably disconnected tip
} else if (newReading < 4000) {
newRes = 60;
} else {
newRes = 80;
}
if (lastTipResistance != newRes) {
#ifdef POW_PD
USBPowerDelivery::triggerRenegotiation();
#endif
}
lastTipResistance = newRes;
}