Hold PD negotiation until detection is done for tip res

source/Core/BSP/BSP.h

@@ -98,6 +98,7 @@ void setStatusLED(const enum StatusLED state);
 // By the PID, after each ADC sample comes in
 // For example, on the MHP30 this is used to figure out the resistance of the hotplate
 uint8_t preStartChecks();
+uint8_t preStartChecksDone();
 #ifdef __cplusplus
 }
 #endif

source/Core/BSP/Magic/BSP.cpp

@@ -226,7 +226,7 @@ void setStatusLED(const enum StatusLED state) {
   // Dont have one
 }
 
-uint8_t  lastTipResistance = 85; // default safe
+uint8_t  lastTipResistance = 0; // default to unknown
 uint32_t lastTipReadinguV  = 0;
 uint8_t  getTipResitanceX10() {
   // Return tip resistance in x10 ohms
@@ -270,7 +270,6 @@ void FinishMeasureTipResistance() {
   lastTipResistance = newRes;
 }
 volatile bool tipMeasurementOccuring = false;
-volatile uint8_t tipSenseResistancex10Ohms = 0;
 
 void performTipMeasurementStep(bool start) {
   static TickType_t lastMeas = 0;
@@ -280,13 +279,13 @@ void performTipMeasurementStep(bool start) {
   // We want to perform our startup measurements of the tip resistance until we detect one fitted
 
   // Step 1; if not setup, we turn on pullup and then wait
-  if (tipMeasurementOccuring == false && (start || tipSenseResistancex10Ohms == 0 || lastMeas == 0)) {
+  if (tipMeasurementOccuring == false && (start || lastTipResistance == 0 || lastMeas == 0)) {
     // Block starting if tip removed
     if (isTipDisconnected()) {
       return;
     }
     tipMeasurementOccuring = true;
-    tipSenseResistancex10Ohms = 0;
+    lastTipResistance      = 0;
     lastMeas               = xTaskGetTickCount();
     startMeasureTipResistance();
     return;
@@ -308,6 +307,7 @@ uint8_t preStartChecks() {
   performTipMeasurementStep(false);
   return tipMeasurementOccuring ? 1 : 0;
 }
+uint8_t preStartChecksDone() { return (lastTipResistance == 0 || tipMeasurementOccuring) ? 0 : 1; }
 
 // Return hardware unique ID if possible
 uint64_t getDeviceID() {

source/Core/Threads/POWThread.cpp

@@ -21,6 +21,9 @@
 void startPOWTask(void const *argument __unused) {
   // Init any other misc sensors
   postRToSInit();
+  while (preStartChecksDone() == 0) {
+    osDelay(3);
+  }
   // You have to run this once we are willing to answer PD messages
   // Setting up too early can mean that we miss the ~20ms window to respond on some chargers
 #if POW_PD