Apple-2-HW/afterburner
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ensure GPIOs are set to Input when not active

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This should prevent accidental damage of the GAL chip
during insertion into the socket.
This commit is contained in:
ole00 2023-01-24 20:17:49 +00:00
parent ed14f825a5
commit ae955a8b6b
1 changed files with 26 additions and 18 deletions
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44
afterburner.ino
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@ -250,6 +250,24 @@ void printHelp(char full) {
Serial.println(F(" t - test VPP"));
}
static void setupGpios(uint8_t pm) {
// Serial input of the GAL chip, output from Arduino
pinMode(PIN_SDIN, pm);
pinMode(PIN_STROBE, pm);
pinMode(PIN_PV, pm);
pinMode(PIN_RA0, pm);
pinMode(PIN_RA1, pm);
pinMode(PIN_RA2, pm);
pinMode(PIN_RA3, pm);
pinMode(PIN_RA4, pm);
pinMode(PIN_RA5, pm);
pinMode(PIN_SCLK, pm);
pinMode(PIN_VPP, pm);
}
// setup the Arduino board
void setup() {
// initialize serial:
@ -259,27 +277,13 @@ void setup() {
echoEnabled = 0;
mapUploaded = 0;
typeCheck = 1; //do type check
lineIndex = 0;
// Serial output from the GAL chip, input for Arduino
pinMode(PIN_SDOUT, INPUT);
// Serial input of the GAL chip, output from Arduino
pinMode(PIN_SDIN, OUTPUT);
pinMode(PIN_STROBE, OUTPUT);
pinMode(PIN_PV, OUTPUT);
pinMode(PIN_RA0, OUTPUT);
pinMode(PIN_RA1, OUTPUT);
pinMode(PIN_RA2, OUTPUT);
pinMode(PIN_RA3, OUTPUT);
pinMode(PIN_RA4, OUTPUT);
pinMode(PIN_RA5, OUTPUT);
pinMode(PIN_SCLK, OUTPUT);
pinMode(PIN_VPP, OUTPUT);
// Important - the output pins should be kept high.
// TurnOff function does that (keeps pin high).
turnOff();
// Set all GPIO pins to Input to prevent accidents when
// inserting the GAL IC into socket.
setupGpios(INPUT);
printHelp(0);
Serial.println(">");
@ -539,11 +543,12 @@ static void turnOff(void)
delay(2);
setVCC(0); // turn off VCC (if controlled)
setupGpios(INPUT);
}
// GAL init sequence
static void turnOn(char mode) {
setupGpios(OUTPUT);
if (
mode == WRITEGAL ||
@ -1443,11 +1448,14 @@ static void printNoFusesError() {
static void testVoltage(int seconds) {
int i;
pinMode(PIN_VPP, OUTPUT);
setVPP(1);
for (i = 0 ; i < seconds; i++) {
delay(1000);
}
setVPP(0);
pinMode(PIN_VPP, INPUT);
}