testprobe

pcb/readme.md

@@ -10,7 +10,7 @@ The current design of the *dw-link probe* is more ambitious, but far from an ind
 * reasonable loads on the SPI lines, e.g., an LED and a 1 kΩ series resistor (but no stronger resistor),
 * no capactive load on the RESET line of the target,
 * no loads higher than a 10 kΩ resistance on the RESET line,
-* minimum target MCU clock frequency of 16 kHz.
+* minimum target MCU clock frequency of 4 kHz.
 
 If these constraints are met, the dw-link probe should work.  Otherwise, one might encounter strange behavior and/or error messages. 
 

testprobe/testprobe.ino

@@ -20,10 +20,12 @@ void setup()
   Serial.println(F("\nTesting dw-link-probe " VERSION));
   pinMode(SYSLED, OUTPUT);
   pinMode(TMISO, OUTPUT);
-  // initially switch the two SPI lines to GND in order to discharge any stry capacitance
+  // initially switch the two SPI lines and the RESET line to GND in order to discharge any stray capacitance
   pinMode(TARMOSI, OUTPUT);
   pinMode(TARSCK, OUTPUT);
+  pinMode(DWLINE, OUTPUT);
   delay(100);
+  pinMode(DWLINE, INPUT);
   pinMode(TARMOSI,INPUT);
   pinMode(TARSCK,INPUT);
   printHelp();