├── .gitignore
├── README.md
├── SoftwareSPI.cpp
├── SoftwareSPI.h
└── library.json


/.gitignore:
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1 | *.swp
2 | 


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/README.md:
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 1 | SoftwareSPI
 2 | -----------
 3 | 
 4 | This is a simple library to simplify bit-banging SPI on an Arduino. It accepts any arduino pins and uses only digitalWrites and digitalReads to handle the data.
 5 | 
 6 | First include the library:
 7 | 
 8 |     #include <SoftwareSPI.h>
 9 | 
10 | Then initialize it with the correct pins:
11 | 
12 |     SoftwareSPI spi(SPI_SCK,SPI_MOSI,SPI_MISO,SPI_CS);
13 | 
14 | **Note: You can use 0 for the CS pin if you don't plan on using spi.select() or spi.deselect()**
15 | 
16 | Before using it, configure the pins by calling begin:
17 | 
18 |     spi.begin();
19 | 
20 | Transfer data by using select, transfer, and deselect:
21 | 
22 |     spi.select();
23 |     byte value = spi.transfer(5);
24 |     spi.deselect();
25 | 
26 | 


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/SoftwareSPI.cpp:
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 1 | #include "SoftwareSPI.h"
 2 | 
 3 | SoftwareSPI::SoftwareSPI(byte pin_sck, byte pin_mosi, byte pin_miso, byte pin_cs) {
 4 |     _pin_sck = pin_sck;
 5 |     _pin_mosi = pin_mosi;
 6 |     _pin_miso = pin_miso;
 7 |     _pin_cs = pin_cs;
 8 | }
 9 | 
10 | void SoftwareSPI::begin() {
11 |     deselect();
12 |     pinMode(_pin_cs, OUTPUT);
13 | 
14 |     pinMode(_pin_sck, OUTPUT);
15 |     pinMode(_pin_mosi, OUTPUT);
16 |     pinMode(_pin_miso, INPUT);
17 | }
18 | 
19 | byte SoftwareSPI::transfer(byte b) {
20 |     byte rec = 0;
21 | 
22 |     for (int i = 0; i < 8; i++) {
23 |         digitalWrite(_pin_mosi, bitRead(b, 7-i)); //MSB first
24 |         digitalWrite(_pin_sck, HIGH);
25 |         bitWrite(rec, 7-i, digitalRead(_pin_miso));
26 |         digitalWrite(_pin_sck, LOW);
27 |     }
28 | 
29 |     return rec;
30 | }
31 | 
32 | void SoftwareSPI::select() {
33 |     digitalWrite(_pin_cs,LOW);
34 | }
35 | 
36 | void SoftwareSPI::deselect() {
37 |     digitalWrite(_pin_cs,HIGH);
38 | }
39 | 
40 | 


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/SoftwareSPI.h:
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 1 | #ifndef SoftwareSPI_h
 2 | #define SoftwareSPI_h
 3 | 
 4 | #if defined(ARDUINO) && ARDUINO >= 100
 5 | #include "Arduino.h"
 6 | #else
 7 | #include "WProgram.h"
 8 | #endif
 9 | 
10 | class SoftwareSPI {
11 | public:
12 |     SoftwareSPI(byte, byte, byte, byte);
13 |     void begin();
14 |     byte transfer(byte);
15 |     void select();
16 |     void deselect();
17 | 
18 | private:
19 |     byte _pin_sck;
20 |     byte _pin_mosi;
21 |     byte _pin_miso;
22 |     byte _pin_cs;
23 | };
24 | 
25 | #endif
26 | 


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/library.json:
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 1 | {
 2 |     "name": "SoftwareSPI",
 3 |     "keywords": "spi",
 4 |     "description": "A barebones library for bitbanging SPI",
 5 |     "repository":
 6 |     {
 7 |         "type": "git",
 8 |         "url": "https://github.com/Flickerstrip/SoftwareSPI.git"
 9 |     },
10 |     "frameworks": "arduino",
11 |     "platforms": "*"
12 | }
13 | 


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