Stap 1: Schets voor hoogspanning programmering
Een schets voor Uno is hier beschikbaar voor ontgrendelen ATtiny85:
http://www.rickety.us/wp-content/uploads/2010/03/hv_serial_prog.pde
Code is door Paul Willoughby en originele artikel voor ontgrendelen blote ATtiny85 ICs hier:
http://www.rickety.US/2010/03/Arduino-AVR-High-Voltage-Serial-Programmer/
Schets:
// AVR High-voltage Serial Programmer// Originally created by Paul Willoughby 03/20/2010 // www.rickety.us slash 2010/03/arduino-avr-high-voltage-serial-programmer/ // Inspired by Jeff Keyzer mightyohm.com // Serial Programming routines from ATtiny25/45/85 datasheet// Desired fuse configuration #define HFUSE 0xDF // Defaults for ATtiny25/45/85 #define LFUSE 0x62 #define RST 13 // Output to level shifter for !RESET from transistor to Pin 1 #define CLKOUT 12 // Connect to Serial Clock Input (SCI) Pin 2 #define DATAIN 11 // Connect to Serial Data Output (SDO) Pin 7 #define INSTOUT 10 // Connect to Serial Instruction Input (SII) Pin 6 #define DATAOUT 9 // Connect to Serial Data Input (SDI) Pin 5 #define VCC 8 // Connect to VCC Pin 8int inByte = 0; // incoming serial byte Computer int inData = 0; // incoming serial byte AVRvoid setup() { // Set up control lines for HV parallel programming pinMode(VCC, OUTPUT); pinMode(RST, OUTPUT); pinMode(DATAOUT, OUTPUT); pinMode(INSTOUT, OUTPUT); pinMode(CLKOUT, OUTPUT); pinMode(DATAIN, OUTPUT); // configured as input when in programming mode // Initialize output pins as needed digitalWrite(RST, HIGH); // Level shifter is inverting, this shuts off 12V // start serial port at 9600 bps: Serial.begin(9600); establishContact(); // send a byte to establish contact until receiver responds }void loop() { // if we get a valid byte, run: if (Serial.available() > 0) { // get incoming byte: inByte = Serial.read(); Serial.println(byte(inByte)); Serial.println("Entering programming Mode\n"); // Initialize pins to enter programming mode pinMode(DATAIN, OUTPUT); //Temporary digitalWrite(DATAOUT, LOW); digitalWrite(INSTOUT, LOW); digitalWrite(DATAIN, LOW); digitalWrite(RST, HIGH); // Level shifter is inverting, this shuts off 12V // Enter High-voltage Serial programming mode digitalWrite(VCC, HIGH); // Apply VCC to start programming process delayMicroseconds(20); digitalWrite(RST, LOW); //Turn on 12v delayMicroseconds(10); pinMode(DATAIN, INPUT); //Release DATAIN delayMicroseconds(300); //Programming mode readFuses(); //Write hfuse Serial.println("Writing hfuse"); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x40, 0x4C); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, HFUSE, 0x2C); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x74); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x7C); //Write lfuse Serial.println("Writing lfuse\n"); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x40, 0x4C); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, LFUSE, 0x2C); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x64); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x6C); readFuses(); Serial.println("Exiting programming Mode\n"); digitalWrite(CLKOUT, LOW); digitalWrite(VCC, LOW); digitalWrite(RST, HIGH); //Turn off 12v } }void establishContact() { while (Serial.available() <= 0) { Serial.println("Enter a character to continue"); // send an initial string delay(1000); } }int shiftOut2(uint8_t dataPin, uint8_t dataPin1, uint8_t clockPin, uint8_t bitOrder, byte val, byte val1) { int i; int inBits = 0; //Wait until DATAIN goes high while (!digitalRead(DATAIN)); //Start bit digitalWrite(DATAOUT, LOW); digitalWrite(INSTOUT, LOW); digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW); for (i = 0; i < 8; i++) { if (bitOrder == LSBFIRST) { digitalWrite(dataPin, !!(val & (1 << i))); digitalWrite(dataPin1, !!(val1 & (1 << i))); } else { digitalWrite(dataPin, !!(val & (1 << (7 - i)))); digitalWrite(dataPin1, !!(val1 & (1 << (7 - i)))); } inBits <<=1; inBits |= digitalRead(DATAIN); digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW); } //End bits digitalWrite(DATAOUT, LOW); digitalWrite(INSTOUT, LOW); digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW); digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW); return inBits; }void readFuses(){ //Read lfuse shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x04, 0x4C); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x68); inData = shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x6C); Serial.print("lfuse reads as "); Serial.println(inData, HEX); //Read hfuse shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x04, 0x4C); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x7A); inData = shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x7E); Serial.print("hfuse reads as "); Serial.println(inData, HEX); //Read efuse shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x04, 0x4C); shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x6A); inData = shiftOut2(DATAOUT, INSTOUT, CLKOUT, MSBFIRST, 0x00, 0x6E); Serial.print("efuse reads as "); Serial.println(inData, HEX); Serial.println(); }
