add some gpio retries

Adafruit_TestBed.cpp

@@ -218,6 +218,7 @@ bool Adafruit_TestBed::testAnalogVoltage(uint16_t pin, const char *name,
 /**************************************************************************/
 bool Adafruit_TestBed::testpins(uint8_t a, uint8_t b, uint8_t *allpins,
                                 uint8_t num_allpins) {
+  bool ok = false;
 
   theSerial->print(F("\tTesting "));
   theSerial->print(a, DEC);
@@ -237,6 +238,7 @@ bool Adafruit_TestBed::testpins(uint8_t a, uint8_t b, uint8_t *allpins,
     return false;
   }
 
+  for (int retry=0; retry<3 && !ok; retry++) {
     // turn off both pullups
     pinMode(a, INPUT);
     pinMode(b, INPUT);
@@ -248,17 +250,23 @@ bool Adafruit_TestBed::testpins(uint8_t a, uint8_t b, uint8_t *allpins,
     
     int ar = digitalRead(a);
     int br = digitalRead(b);
+    delay(5);
     
     // make sure both are low
     if (ar || br) {
-    theSerial->print(F("Low test fail on "));
+      theSerial->print(F("Low test fail on pin #"));
       if (br)
 	theSerial->println(b, DEC);
       if (ar)
 	theSerial->println(a, DEC);
-    return false;
+      ok = false;
+    }
+    ok = true;
   }
 
+  ok = false;
+  for (int retry=0; retry<3 && !ok; retry++) {
+    //theSerial->println("OK!");
     // a is an input, b is an output
     pinMode(a, INPUT);
     pinMode(b, OUTPUT);
@@ -271,10 +279,11 @@ bool Adafruit_TestBed::testpins(uint8_t a, uint8_t b, uint8_t *allpins,
 	|| !digitalRead(b)
 #endif
 	) {
-    theSerial->println(
-        F("Ground test 2 fail: both pins should not be grounded"));
+      theSerial->println(F("Ground test 2 fail: both pins should not be grounded"));
       delay(100);
-    return false;
+      ok = false;
+    }
+    ok = true;
   }
 
   // make sure no pins are shorted to pin a or b

Adafruit_TestBed_Brains.cpp

@@ -157,12 +157,12 @@ void Adafruit_TestBed_Brains::rp2040_targetResetBootRom(int bootsel_pin,
   pinMode(bootsel_pin, OUTPUT);
 
   digitalWrite(bootsel_pin, LOW);
+  delay(reset_ms);
 
   targetReset(reset_ms);
   delay(reset_ms);
 
   // change bootsel to input since it is muxed with Flash ChipSelect
-  digitalWrite(bootsel_pin, HIGH);
   pinMode(bootsel_pin, INPUT);
 }