 #define Log         Serial
 #define Target      Serial1
 #endif
+
+// adjust as needed to blink an LED and to adjust target ISP & RESET modes
+//#define LED_PIN     ...
+//#define RESET_PIN   ...
+//#define ISP_PIN     ...
 
 static void targetInit () { Target.begin(9600, SERIAL_8E1); }
 


// main sketch logic
void setup () {
    Log.begin(115200);
    Log.print("[stm32f1init] ");
    Log.println(BOOT_LOADER);

    Log.print(" FAILED - got 0x");
    Log.println(b, HEX);

    controlPins(false, false);
    while (true) { // halt, blinking rapidly
        toggleLed();
        delay(100);
