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Support at89sx mcu's by adding the possibility to specify the polarity of the target reset signal.

This commit is contained in:
Peter Van Hoyweghen 2015-02-25 21:52:30 +01:00
parent 56e09109df
commit 15da182399
1 changed files with 19 additions and 3 deletions
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22
build/shared/examples/11.ArduinoISP/ArduinoISP/ArduinoISP.ino
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@ -123,6 +123,13 @@ void heartbeat() {
analogWrite(LED_HB, hbval);
}
static bool rst_active_high;
void reset_target(bool reset)
{
digitalWrite(RESET, ((reset && rst_active_high) || (!reset && !rst_active_high)) ? HIGH : LOW);
}
void loop(void) {
// is pmode active?
if (pmode) {
@ -242,15 +249,24 @@ void set_parameters() {
+ buff[18] * 0x00000100
+ buff[19];
// avr devices have active low reset, at89sx are active high
rst_active_high = (param.devicecode >= 0xe0);
}
void start_pmode() {
SPI.begin();
digitalWrite(RESET, HIGH);
// SPI.begin() has configured SS as output,
// so SPI master mode is selected.
// We have defined RESET as pin 10,
// which for many arduino's is not the SS pin.
// So we have to configure RESET as output here,
// (reset_target() first sets the level correct)
reset_target(false);
pinMode(RESET, OUTPUT);
digitalWrite(SCK, LOW);
delay(20);
digitalWrite(RESET, LOW);
reset_target(true);
delay(50);
spi_transaction(0xAC, 0x53, 0x00, 0x00);
pmode = 1;
@ -258,7 +274,7 @@ void start_pmode() {
void end_pmode() {
SPI.end();
digitalWrite(RESET, HIGH);
reset_target(false);
pinMode(RESET, INPUT);
pmode = 0;
}