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Code Issues Releases Activity

Rework pin configuration.

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This commit is contained in:
Peter Van Hoyweghen 2015-09-05 20:43:44 +02:00
parent bfffb17e40
commit d2a38f23a8
1 changed files with 50 additions and 30 deletions
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80
build/shared/examples/11.ArduinoISP/ArduinoISP/ArduinoISP.ino
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@ -8,8 +8,9 @@
//
// Pin 10 is used to reset the target microcontroller.
//
// The MISO, MOSI and SCK pins are used to communicate with the target,
// on all Arduinos, these pins can be found on the ICSP header:
// By default, the hardware SPI pins MISO, MOSI and SCK pins are used
// to communicate with the target. On all Arduinos, these pins can be found
// on the ICSP/SPI header:
//
// MISO °. . 5V (!) Avoid this pin on Due, Zero...
// SCK . . MOSI
@ -20,6 +21,9 @@
// instruct you to hook up the target to these pins. If you find this wiring
// more practical, have a define USE_OLD_STYLE_WIRING. This will work even
// even when not using an Uno. (On an Uno this is not needed).
//
// Alternatively you can use any other digital pin by configuring software ('BitBanged')
// SPI and having appropriate defines for PIN_MOSI, PIN_MISO and PIN_SCK.
//
// IMPORTANT: When using an Arduino that is not 5V tolerant (Due, Zero, ...)
// as the programmer, make sure to not expose any of the programmer's pins to 5V.
@ -61,7 +65,7 @@
#endif
// Configure which pins to use
// Configure which pins to use:
// The standard pin configuration.
#ifndef ARDUINO_HOODLOADER2
@ -71,19 +75,17 @@
#define LED_ERR 8
#define LED_PMODE 7
// Uncomment following line to use the old uno style wiring
// Uncomment following line to use the old Uno style wiring
// (using pin 11, 12 and 13 instead of the SPI header) on Leonardo, Due...
// #define USE_OLD_STYLE_WIRING
#ifdef USE_OLD_STYLE_WIRING
#undef USE_HARDWARE_SPI
#undef MOSI
#undef MISO
#undef SCK
#define MOSI 11
#define MISO 12
#define SCK 13
#define PIN_MOSI 11
#define PIN_MISO 12
#define PIN_SCK 13
#endif
// HOODLOADER2 means running sketches on the atmega16u2
@ -91,13 +93,31 @@
// We must use pins that are broken out:
#else
#define RESET 4
#define LED_HB 7
#define LED_ERR 6
#define LED_PMODE 5
#define RESET 4
#define LED_HB 7
#define LED_ERR 6
#define LED_PMODE 5
#endif
// By default, use hardware SPI pins:
#ifndef PIN_MOSI
#define PIN_MOSI MOSI
#endif
#ifndef PIN_MISO
#define PIN_MISO MISO
#endif
#ifndef PIN_SCK
#define PIN_SCK SCK
#endif
// Force bitbanged SPI if not using the hardware SPI pins:
#if (PIN_MISO != MISO) || (PIN_MOSI != MOSI) || (PIN_SCK != SCK)
#undef USE_HARDWARE_SPI
#endif
// Configure the serial port to use.
//
@ -155,11 +175,11 @@ friend class BitBangedSPI;
class BitBangedSPI {
public:
void begin() {
digitalWrite(SCK, LOW);
digitalWrite(MOSI, LOW);
pinMode(SCK, OUTPUT);
pinMode(MOSI, OUTPUT);
pinMode(MISO, INPUT);
digitalWrite(PIN_SCK, LOW);
digitalWrite(PIN_MOSI, LOW);
pinMode(PIN_SCK, OUTPUT);
pinMode(PIN_MOSI, OUTPUT);
pinMode(PIN_MISO, INPUT);
}
void beginTransaction(SPISettings settings) {
@ -172,11 +192,11 @@ public:
uint8_t transfer (uint8_t b) {
for (unsigned int i = 0; i < 8; ++i) {
digitalWrite(MOSI, (b & 0x80) ? HIGH : LOW);
digitalWrite(SCK, HIGH);
digitalWrite(PIN_MOSI, (b & 0x80) ? HIGH : LOW);
digitalWrite(PIN_SCK, HIGH);
delayMicroseconds(pulseWidth);
b = (b << 1) | digitalRead(MISO);
digitalWrite(SCK, LOW); // slow pulse
b = (b << 1) | digitalRead(PIN_MISO);
digitalWrite(PIN_SCK, LOW); // slow pulse
delayMicroseconds(pulseWidth);
}
return b;
@ -372,7 +392,7 @@ void set_parameters() {
void start_pmode() {
// Reset target before driving SCK or MOSI
// Reset target before driving PIN_SCK or PIN_MOSI
// SPI.begin() will configure SS as output,
// so SPI master mode is selected.
@ -387,9 +407,9 @@ void start_pmode() {
// See avr datasheets, chapter "SERIAL_PRG Programming Algorithm":
// Pulse RESET after SCK is low:
digitalWrite(SCK, LOW);
delay(20); // discharge SCK, value arbitrally chosen
// Pulse RESET after PIN_SCK is low:
digitalWrite(PIN_SCK, LOW);
delay(20); // discharge PIN_SCK, value arbitrally chosen
reset_target(false);
// Pulse must be minimum 2 target CPU clock cycles
// so 100 usec is ok for CPU speeds above 20KHz
@ -406,8 +426,8 @@ void end_pmode() {
SPI.end();
// We're about to take the target out of reset
// so configure SPI pins as input
pinMode(MOSI, INPUT);
pinMode(SCK, INPUT);
pinMode(PIN_MOSI, INPUT);
pinMode(PIN_SCK, INPUT);
reset_target(false);
pinMode(RESET, INPUT);
pmode = 0;