rooty/Arduino
1
0
Fork 0
mirror of https://github.com/arduino/Arduino.git synced 2025-01-29 18:52:13 +01:00
Code Issues Releases Activity

Moving SPI pin definitions into core (from SPI library): SS, MISO, MOSI, and SCK.

Browse Source
This commit is contained in:
David A. Mellis 2010-08-02 22:33:11 +00:00
parent 94045e292a
commit 0aec45afbc
2 changed files with 21 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
hardware/arduino/cores/arduino/pins_arduino.h
View File

@ -49,6 +49,18 @@
#define TIMER5B 15
#define TIMER5C 16
#if defined(__AVR_ATmega1280__)
const static uint8_t SS = 53;
const static uint8_t MOSI = 51;
const static uint8_t MISO = 50;
const static uint8_t SCK = 52;
#else
const static uint8_t SS = 10;
const static uint8_t MOSI = 11;
const static uint8_t MISO = 12;
const static uint8_t SCK = 13;
#endif
// On the ATmega1280, the addresses of some of the port registers are
// greater than 255, so we can't store them in uint8_t's.
extern const uint16_t PROGMEM port_to_mode_PGM[];

25
libraries/SPI/SPI.cpp
View File

@ -8,34 +8,27 @@
* published by the Free Software Foundation.
*/
#include "pins_arduino.h"
#include "SPI.h"
SPIClass SPI;
SPIClass::SPIClass()
{
#if defined(__AVR_ATmega1280__)
// PBx
const static byte SS = 0;
const static byte MOSI = 2;
const static byte MISO = 3;
const static byte SCK = 1;
#else
// PBx
const static byte SS = 2;
const static byte MOSI = 3;
const static byte MISO = 4;
const static byte SCK = 5;
#endif
// Set direction register for SCK and MOSI pin.
// MISO pin automatically overrides to INPUT.
// When the SS pin is set as OUTPUT, it can be used as
// a general purpose output port (it doesn't influence
// SPI operations).
DDRB |= _BV(SCK) | _BV(MOSI) | _BV(SS);
PORTB &= ~(_BV(SCK) | _BV(MOSI) | _BV(SS));
pinMode(SCK, OUTPUT);
pinMode(MOSI, OUTPUT);
pinMode(SS, OUTPUT);
digitalWrite(SCK, LOW);
digitalWrite(MOSI, LOW);
digitalWrite(SS, LOW);
SPCR = _BV(SPE) | _BV(MSTR);
// Warning: if the SS pin ever becomes a LOW INPUT then SPI