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MarlinFirmware/Marlin/softspi.h
Paweł Stawicki 44cdebb8f1 Add software spi support for max6675
2017-04-09 06:44:53 -05:00

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27 KiB
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//https://github.com/niteris/ArduinoSoftSpi
#include <Arduino.h>
#ifdef __arm__
#ifdef CORE_TEENSY
//------------------------------------------------------------------------------
/** read pin value
* @param[in] pin Arduino pin number
* @return value read
*/
static inline __attribute__((always_inline))
bool fastDigitalRead(uint8_t pin) {
return *portInputRegister(pin);
}
//------------------------------------------------------------------------------
/** Set pin value
* @param[in] pin Arduino pin number
* @param[in] level value to write
*/
static inline __attribute__((always_inline))
void fastDigitalWrite(uint8_t pin, bool value) {
if (value) {
*portSetRegister(pin) = 1;
} else {
*portClearRegister(pin) = 1;
}
}
#else // CORE_TEENSY
//------------------------------------------------------------------------------
/** read pin value
* @param[in] pin Arduino pin number
* @return value read
*/
static inline __attribute__((always_inline))
bool fastDigitalRead(uint8_t pin){
return g_APinDescription[pin].pPort->PIO_PDSR & g_APinDescription[pin].ulPin;
}
//------------------------------------------------------------------------------
/** Set pin value
* @param[in] pin Arduino pin number
* @param[in] level value to write
*/
static inline __attribute__((always_inline))
void fastDigitalWrite(uint8_t pin, bool value){
if(value) {
g_APinDescription[pin].pPort->PIO_SODR = g_APinDescription[pin].ulPin;
} else {
g_APinDescription[pin].pPort->PIO_CODR = g_APinDescription[pin].ulPin;
}
}
#endif // CORE_TEENSY
//------------------------------------------------------------------------------
inline void fastDigitalToggle(uint8_t pin) {
fastDigitalWrite(pin, !fastDigitalRead(pin));
}
//------------------------------------------------------------------------------
inline void fastPinMode(uint8_t pin, bool mode) {pinMode(pin, mode);}
#else // __arm__
#include <avr/io.h>
#include <util/atomic.h>
//------------------------------------------------------------------------------
/**
* @class pin_map_t
* @brief struct for mapping digital pins
*/
struct pin_map_t {
volatile uint8_t* ddr; /**< address of DDR for this pin */
volatile uint8_t* pin; /**< address of PIN for this pin */
volatile uint8_t* port; /**< address of PORT for this pin */
uint8_t bit; /**< bit number for this pin */
};
//------------------------------------------------------------------------------
#if defined(__AVR_ATmega168__)\
||defined(__AVR_ATmega168P__)\
||defined(__AVR_ATmega328P__)
// 168 and 328 Arduinos
const static pin_map_t pinMap[] = {
{&DDRD, &PIND, &PORTD, 0}, // D0 0
{&DDRD, &PIND, &PORTD, 1}, // D1 1
{&DDRD, &PIND, &PORTD, 2}, // D2 2
{&DDRD, &PIND, &PORTD, 3}, // D3 3
{&DDRD, &PIND, &PORTD, 4}, // D4 4
{&DDRD, &PIND, &PORTD, 5}, // D5 5
{&DDRD, &PIND, &PORTD, 6}, // D6 6
{&DDRD, &PIND, &PORTD, 7}, // D7 7
{&DDRB, &PINB, &PORTB, 0}, // B0 8
{&DDRB, &PINB, &PORTB, 1}, // B1 9
{&DDRB, &PINB, &PORTB, 2}, // B2 10
{&DDRB, &PINB, &PORTB, 3}, // B3 11
{&DDRB, &PINB, &PORTB, 4}, // B4 12
{&DDRB, &PINB, &PORTB, 5}, // B5 13
{&DDRC, &PINC, &PORTC, 0}, // C0 14
{&DDRC, &PINC, &PORTC, 1}, // C1 15
{&DDRC, &PINC, &PORTC, 2}, // C2 16
{&DDRC, &PINC, &PORTC, 3}, // C3 17
{&DDRC, &PINC, &PORTC, 4}, // C4 18
{&DDRC, &PINC, &PORTC, 5} // C5 19
};
//------------------------------------------------------------------------------
#elif defined(__AVR_ATmega1280__)\
|| defined(__AVR_ATmega2560__)
// Mega
static const pin_map_t pinMap[] = {
{&DDRE, &PINE, &PORTE, 0}, // E0 0
{&DDRE, &PINE, &PORTE, 1}, // E1 1
{&DDRE, &PINE, &PORTE, 4}, // E4 2
{&DDRE, &PINE, &PORTE, 5}, // E5 3
{&DDRG, &PING, &PORTG, 5}, // G5 4
{&DDRE, &PINE, &PORTE, 3}, // E3 5
{&DDRH, &PINH, &PORTH, 3}, // H3 6
{&DDRH, &PINH, &PORTH, 4}, // H4 7
{&DDRH, &PINH, &PORTH, 5}, // H5 8
{&DDRH, &PINH, &PORTH, 6}, // H6 9
{&DDRB, &PINB, &PORTB, 4}, // B4 10
{&DDRB, &PINB, &PORTB, 5}, // B5 11
{&DDRB, &PINB, &PORTB, 6}, // B6 12
{&DDRB, &PINB, &PORTB, 7}, // B7 13
{&DDRJ, &PINJ, &PORTJ, 1}, // J1 14
{&DDRJ, &PINJ, &PORTJ, 0}, // J0 15
{&DDRH, &PINH, &PORTH, 1}, // H1 16
{&DDRH, &PINH, &PORTH, 0}, // H0 17
{&DDRD, &PIND, &PORTD, 3}, // D3 18
{&DDRD, &PIND, &PORTD, 2}, // D2 19
{&DDRD, &PIND, &PORTD, 1}, // D1 20
{&DDRD, &PIND, &PORTD, 0}, // D0 21
{&DDRA, &PINA, &PORTA, 0}, // A0 22
{&DDRA, &PINA, &PORTA, 1}, // A1 23
{&DDRA, &PINA, &PORTA, 2}, // A2 24
{&DDRA, &PINA, &PORTA, 3}, // A3 25
{&DDRA, &PINA, &PORTA, 4}, // A4 26
{&DDRA, &PINA, &PORTA, 5}, // A5 27
{&DDRA, &PINA, &PORTA, 6}, // A6 28
{&DDRA, &PINA, &PORTA, 7}, // A7 29
{&DDRC, &PINC, &PORTC, 7}, // C7 30
{&DDRC, &PINC, &PORTC, 6}, // C6 31
{&DDRC, &PINC, &PORTC, 5}, // C5 32
{&DDRC, &PINC, &PORTC, 4}, // C4 33
{&DDRC, &PINC, &PORTC, 3}, // C3 34
{&DDRC, &PINC, &PORTC, 2}, // C2 35
{&DDRC, &PINC, &PORTC, 1}, // C1 36
{&DDRC, &PINC, &PORTC, 0}, // C0 37
{&DDRD, &PIND, &PORTD, 7}, // D7 38
{&DDRG, &PING, &PORTG, 2}, // G2 39
{&DDRG, &PING, &PORTG, 1}, // G1 40
{&DDRG, &PING, &PORTG, 0}, // G0 41
{&DDRL, &PINL, &PORTL, 7}, // L7 42
{&DDRL, &PINL, &PORTL, 6}, // L6 43
{&DDRL, &PINL, &PORTL, 5}, // L5 44
{&DDRL, &PINL, &PORTL, 4}, // L4 45
{&DDRL, &PINL, &PORTL, 3}, // L3 46
{&DDRL, &PINL, &PORTL, 2}, // L2 47
{&DDRL, &PINL, &PORTL, 1}, // L1 48
{&DDRL, &PINL, &PORTL, 0}, // L0 49
{&DDRB, &PINB, &PORTB, 3}, // B3 50
{&DDRB, &PINB, &PORTB, 2}, // B2 51
{&DDRB, &PINB, &PORTB, 1}, // B1 52
{&DDRB, &PINB, &PORTB, 0}, // B0 53
{&DDRF, &PINF, &PORTF, 0}, // F0 54
{&DDRF, &PINF, &PORTF, 1}, // F1 55
{&DDRF, &PINF, &PORTF, 2}, // F2 56
{&DDRF, &PINF, &PORTF, 3}, // F3 57
{&DDRF, &PINF, &PORTF, 4}, // F4 58
{&DDRF, &PINF, &PORTF, 5}, // F5 59
{&DDRF, &PINF, &PORTF, 6}, // F6 60
{&DDRF, &PINF, &PORTF, 7}, // F7 61
{&DDRK, &PINK, &PORTK, 0}, // K0 62
{&DDRK, &PINK, &PORTK, 1}, // K1 63
{&DDRK, &PINK, &PORTK, 2}, // K2 64
{&DDRK, &PINK, &PORTK, 3}, // K3 65
{&DDRK, &PINK, &PORTK, 4}, // K4 66
{&DDRK, &PINK, &PORTK, 5}, // K5 67
{&DDRK, &PINK, &PORTK, 6}, // K6 68
{&DDRK, &PINK, &PORTK, 7}, // K7 69
//pins_MIGHTYBOARD_REVE.h
{&DDRG, &PING, &PORTG, 4}, // G4 70
{&DDRG, &PING, &PORTG, 3}, // G3 71
{&DDRJ, &PINJ, &PORTJ, 2}, // J2 72
{&DDRJ, &PINJ, &PORTJ, 3}, // J3 73
{&DDRJ, &PINJ, &PORTJ, 7}, // J7 74
{&DDRJ, &PINJ, &PORTJ, 4}, // J4 75
{&DDRJ, &PINJ, &PORTJ, 5}, // J5 76
{&DDRJ, &PINJ, &PORTJ, 6}, // J6 77
{&DDRE, &PINE, &PORTE, 2}, // E2 78
{&DDRE, &PINE, &PORTE, 6} // E6 79
};
//------------------------------------------------------------------------------
#elif defined(__AVR_ATmega1284P__)\
|| defined(__AVR_ATmega1284__)\
|| defined(__AVR_ATmega644P__)\
|| defined(__AVR_ATmega644__)\
|| defined(__AVR_ATmega64__)\
|| defined(__AVR_ATmega32__)\
|| defined(__AVR_ATmega324__)\
|| defined(__AVR_ATmega16__)
#ifdef defined(VARIANT_MIGHTY)
// Mighty Layout
static const pin_map_t pinMap[] = {
{&DDRB, &PINB, &PORTB, 0}, // B0 0
{&DDRB, &PINB, &PORTB, 1}, // B1 1
{&DDRB, &PINB, &PORTB, 2}, // B2 2
{&DDRB, &PINB, &PORTB, 3}, // B3 3
{&DDRB, &PINB, &PORTB, 4}, // B4 4
{&DDRB, &PINB, &PORTB, 5}, // B5 5
{&DDRB, &PINB, &PORTB, 6}, // B6 6
{&DDRB, &PINB, &PORTB, 7}, // B7 7
{&DDRD, &PIND, &PORTD, 0}, // D0 8
{&DDRD, &PIND, &PORTD, 1}, // D1 9
{&DDRD, &PIND, &PORTD, 2}, // D2 10
{&DDRD, &PIND, &PORTD, 3}, // D3 11
{&DDRD, &PIND, &PORTD, 4}, // D4 12
{&DDRD, &PIND, &PORTD, 5}, // D5 13
{&DDRD, &PIND, &PORTD, 6}, // D6 14
{&DDRD, &PIND, &PORTD, 7}, // D7 15
{&DDRC, &PINC, &PORTC, 0}, // C0 16
{&DDRC, &PINC, &PORTC, 1}, // C1 17
{&DDRC, &PINC, &PORTC, 2}, // C2 18
{&DDRC, &PINC, &PORTC, 3}, // C3 19
{&DDRC, &PINC, &PORTC, 4}, // C4 20
{&DDRC, &PINC, &PORTC, 5}, // C5 21
{&DDRC, &PINC, &PORTC, 6}, // C6 22
{&DDRC, &PINC, &PORTC, 7}, // C7 23
{&DDRA, &PINA, &PORTA, 0}, // A0 24
{&DDRA, &PINA, &PORTA, 1}, // A1 25
{&DDRA, &PINA, &PORTA, 2}, // A2 26
{&DDRA, &PINA, &PORTA, 3}, // A3 27
{&DDRA, &PINA, &PORTA, 4}, // A4 28
{&DDRA, &PINA, &PORTA, 5}, // A5 29
{&DDRA, &PINA, &PORTA, 6}, // A6 30
{&DDRA, &PINA, &PORTA, 7} // A7 31
};
#elif defined(VARIANT_BOBUINO)
// Bobuino Layout
static const pin_map_t pinMap[] = {
{&DDRD, &PIND, &PORTD, 0}, // D0 0
{&DDRD, &PIND, &PORTD, 1}, // D1 1
{&DDRD, &PIND, &PORTD, 2}, // D2 2
{&DDRD, &PIND, &PORTD, 3}, // D3 3
{&DDRB, &PINB, &PORTB, 0}, // B0 4
{&DDRB, &PINB, &PORTB, 1}, // B1 5
{&DDRB, &PINB, &PORTB, 2}, // B2 6
{&DDRB, &PINB, &PORTB, 3}, // B3 7
{&DDRD, &PIND, &PORTD, 5}, // D5 8
{&DDRD, &PIND, &PORTD, 6}, // D6 9
{&DDRB, &PINB, &PORTB, 4}, // B4 10
{&DDRB, &PINB, &PORTB, 5}, // B5 11
{&DDRB, &PINB, &PORTB, 6}, // B6 12
{&DDRB, &PINB, &PORTB, 7}, // B7 13
{&DDRA, &PINA, &PORTA, 7}, // A7 14
{&DDRA, &PINA, &PORTA, 6}, // A6 15
{&DDRA, &PINA, &PORTA, 5}, // A5 16
{&DDRA, &PINA, &PORTA, 4}, // A4 17
{&DDRA, &PINA, &PORTA, 3}, // A3 18
{&DDRA, &PINA, &PORTA, 2}, // A2 19
{&DDRA, &PINA, &PORTA, 1}, // A1 20
{&DDRA, &PINA, &PORTA, 0}, // A0 21
{&DDRC, &PINC, &PORTC, 0}, // C0 22
{&DDRC, &PINC, &PORTC, 1}, // C1 23
{&DDRC, &PINC, &PORTC, 2}, // C2 24
{&DDRC, &PINC, &PORTC, 3}, // C3 25
{&DDRC, &PINC, &PORTC, 4}, // C4 26
{&DDRC, &PINC, &PORTC, 5}, // C5 27
{&DDRC, &PINC, &PORTC, 6}, // C6 28
{&DDRC, &PINC, &PORTC, 7}, // C7 29
{&DDRD, &PIND, &PORTD, 4}, // D4 30
{&DDRD, &PIND, &PORTD, 7} // D7 31
};
#elif defined(VARIANT_STANDARD)
// Standard Layout
static const pin_map_t pinMap[] = {
{&DDRB, &PINB, &PORTB, 0}, // B0 0
{&DDRB, &PINB, &PORTB, 1}, // B1 1
{&DDRB, &PINB, &PORTB, 2}, // B2 2
{&DDRB, &PINB, &PORTB, 3}, // B3 3
{&DDRB, &PINB, &PORTB, 4}, // B4 4
{&DDRB, &PINB, &PORTB, 5}, // B5 5
{&DDRB, &PINB, &PORTB, 6}, // B6 6
{&DDRB, &PINB, &PORTB, 7}, // B7 7
{&DDRD, &PIND, &PORTD, 0}, // D0 8
{&DDRD, &PIND, &PORTD, 1}, // D1 9
{&DDRD, &PIND, &PORTD, 2}, // D2 10
{&DDRD, &PIND, &PORTD, 3}, // D3 11
{&DDRD, &PIND, &PORTD, 4}, // D4 12
{&DDRD, &PIND, &PORTD, 5}, // D5 13
{&DDRD, &PIND, &PORTD, 6}, // D6 14
{&DDRD, &PIND, &PORTD, 7}, // D7 15
{&DDRC, &PINC, &PORTC, 0}, // C0 16
{&DDRC, &PINC, &PORTC, 1}, // C1 17
{&DDRC, &PINC, &PORTC, 2}, // C2 18
{&DDRC, &PINC, &PORTC, 3}, // C3 19
{&DDRC, &PINC, &PORTC, 4}, // C4 20
{&DDRC, &PINC, &PORTC, 5}, // C5 21
{&DDRC, &PINC, &PORTC, 6}, // C6 22
{&DDRC, &PINC, &PORTC, 7}, // C7 23
{&DDRA, &PINA, &PORTA, 7}, // A7 24
{&DDRA, &PINA, &PORTA, 6}, // A6 25
{&DDRA, &PINA, &PORTA, 5}, // A5 26
{&DDRA, &PINA, &PORTA, 4}, // A4 27
{&DDRA, &PINA, &PORTA, 3}, // A3 28
{&DDRA, &PINA, &PORTA, 2}, // A2 29
{&DDRA, &PINA, &PORTA, 1}, // A1 30
{&DDRA, &PINA, &PORTA, 0} // A0 31
};
#else // VARIANT_MIGHTY
#error Undefined variant 1284, 644, 324, 64, 32
#endif // VARIANT_MIGHTY
//------------------------------------------------------------------------------
#elif defined(__AVR_ATmega32U4__)
#ifdef CORE_TEENSY
// Teensy 2.0
static const pin_map_t pinMap[] = {
{&DDRB, &PINB, &PORTB, 0}, // B0 0
{&DDRB, &PINB, &PORTB, 1}, // B1 1
{&DDRB, &PINB, &PORTB, 2}, // B2 2
{&DDRB, &PINB, &PORTB, 3}, // B3 3
{&DDRB, &PINB, &PORTB, 7}, // B7 4
{&DDRD, &PIND, &PORTD, 0}, // D0 5
{&DDRD, &PIND, &PORTD, 1}, // D1 6
{&DDRD, &PIND, &PORTD, 2}, // D2 7
{&DDRD, &PIND, &PORTD, 3}, // D3 8
{&DDRC, &PINC, &PORTC, 6}, // C6 9
{&DDRC, &PINC, &PORTC, 7}, // C7 10
{&DDRD, &PIND, &PORTD, 6}, // D6 11
{&DDRD, &PIND, &PORTD, 7}, // D7 12
{&DDRB, &PINB, &PORTB, 4}, // B4 13
{&DDRB, &PINB, &PORTB, 5}, // B5 14
{&DDRB, &PINB, &PORTB, 6}, // B6 15
{&DDRF, &PINF, &PORTF, 7}, // F7 16
{&DDRF, &PINF, &PORTF, 6}, // F6 17
{&DDRF, &PINF, &PORTF, 5}, // F5 18
{&DDRF, &PINF, &PORTF, 4}, // F4 19
{&DDRF, &PINF, &PORTF, 1}, // F1 20
{&DDRF, &PINF, &PORTF, 0}, // F0 21
{&DDRD, &PIND, &PORTD, 4}, // D4 22
{&DDRD, &PIND, &PORTD, 5}, // D5 23
{&DDRE, &PINE, &PORTE, 6} // E6 24
};
//------------------------------------------------------------------------------
#else // CORE_TEENSY
// Leonardo
static const pin_map_t pinMap[] = {
{&DDRD, &PIND, &PORTD, 2}, // D2 0
{&DDRD, &PIND, &PORTD, 3}, // D3 1
{&DDRD, &PIND, &PORTD, 1}, // D1 2
{&DDRD, &PIND, &PORTD, 0}, // D0 3
{&DDRD, &PIND, &PORTD, 4}, // D4 4
{&DDRC, &PINC, &PORTC, 6}, // C6 5
{&DDRD, &PIND, &PORTD, 7}, // D7 6
{&DDRE, &PINE, &PORTE, 6}, // E6 7
{&DDRB, &PINB, &PORTB, 4}, // B4 8
{&DDRB, &PINB, &PORTB, 5}, // B5 9
{&DDRB, &PINB, &PORTB, 6}, // B6 10
{&DDRB, &PINB, &PORTB, 7}, // B7 11
{&DDRD, &PIND, &PORTD, 6}, // D6 12
{&DDRC, &PINC, &PORTC, 7}, // C7 13
{&DDRB, &PINB, &PORTB, 3}, // B3 14
{&DDRB, &PINB, &PORTB, 1}, // B1 15
{&DDRB, &PINB, &PORTB, 2}, // B2 16
{&DDRB, &PINB, &PORTB, 0}, // B0 17
{&DDRF, &PINF, &PORTF, 7}, // F7 18
{&DDRF, &PINF, &PORTF, 6}, // F6 19
{&DDRF, &PINF, &PORTF, 5}, // F5 20
{&DDRF, &PINF, &PORTF, 4}, // F4 21
{&DDRF, &PINF, &PORTF, 1}, // F1 22
{&DDRF, &PINF, &PORTF, 0}, // F0 23
{&DDRD, &PIND, &PORTD, 4}, // D4 24
{&DDRD, &PIND, &PORTD, 7}, // D7 25
{&DDRB, &PINB, &PORTB, 4}, // B4 26
{&DDRB, &PINB, &PORTB, 5}, // B5 27
{&DDRB, &PINB, &PORTB, 6}, // B6 28
{&DDRD, &PIND, &PORTD, 6} // D6 29
};
#endif // CORE_TEENSY
//------------------------------------------------------------------------------
#elif defined(__AVR_AT90USB646__)\
|| defined(__AVR_AT90USB1286__)
// Teensy++ 1.0 & 2.0
static const pin_map_t pinMap[] = {
{&DDRD, &PIND, &PORTD, 0}, // D0 0
{&DDRD, &PIND, &PORTD, 1}, // D1 1
{&DDRD, &PIND, &PORTD, 2}, // D2 2
{&DDRD, &PIND, &PORTD, 3}, // D3 3
{&DDRD, &PIND, &PORTD, 4}, // D4 4
{&DDRD, &PIND, &PORTD, 5}, // D5 5
{&DDRD, &PIND, &PORTD, 6}, // D6 6
{&DDRD, &PIND, &PORTD, 7}, // D7 7
{&DDRE, &PINE, &PORTE, 0}, // E0 8
{&DDRE, &PINE, &PORTE, 1}, // E1 9
{&DDRC, &PINC, &PORTC, 0}, // C0 10
{&DDRC, &PINC, &PORTC, 1}, // C1 11
{&DDRC, &PINC, &PORTC, 2}, // C2 12
{&DDRC, &PINC, &PORTC, 3}, // C3 13
{&DDRC, &PINC, &PORTC, 4}, // C4 14
{&DDRC, &PINC, &PORTC, 5}, // C5 15
{&DDRC, &PINC, &PORTC, 6}, // C6 16
{&DDRC, &PINC, &PORTC, 7}, // C7 17
{&DDRE, &PINE, &PORTE, 6}, // E6 18
{&DDRE, &PINE, &PORTE, 7}, // E7 19
{&DDRB, &PINB, &PORTB, 0}, // B0 20
{&DDRB, &PINB, &PORTB, 1}, // B1 21
{&DDRB, &PINB, &PORTB, 2}, // B2 22
{&DDRB, &PINB, &PORTB, 3}, // B3 23
{&DDRB, &PINB, &PORTB, 4}, // B4 24
{&DDRB, &PINB, &PORTB, 5}, // B5 25
{&DDRB, &PINB, &PORTB, 6}, // B6 26
{&DDRB, &PINB, &PORTB, 7}, // B7 27
{&DDRA, &PINA, &PORTA, 0}, // A0 28
{&DDRA, &PINA, &PORTA, 1}, // A1 29
{&DDRA, &PINA, &PORTA, 2}, // A2 30
{&DDRA, &PINA, &PORTA, 3}, // A3 31
{&DDRA, &PINA, &PORTA, 4}, // A4 32
{&DDRA, &PINA, &PORTA, 5}, // A5 33
{&DDRA, &PINA, &PORTA, 6}, // A6 34
{&DDRA, &PINA, &PORTA, 7}, // A7 35
{&DDRE, &PINE, &PORTE, 4}, // E4 36
{&DDRE, &PINE, &PORTE, 5}, // E5 37
{&DDRF, &PINF, &PORTF, 0}, // F0 38
{&DDRF, &PINF, &PORTF, 1}, // F1 39
{&DDRF, &PINF, &PORTF, 2}, // F2 40
{&DDRF, &PINF, &PORTF, 3}, // F3 41
{&DDRF, &PINF, &PORTF, 4}, // F4 42
{&DDRF, &PINF, &PORTF, 5}, // F5 43
{&DDRF, &PINF, &PORTF, 6}, // F6 44
{&DDRF, &PINF, &PORTF, 7} // F7 45
};
//------------------------------------------------------------------------------
#else // CPU type
#error unknown CPU type
#endif // CPU type
//------------------------------------------------------------------------------
/** count of pins */
static const uint8_t digitalPinCount = sizeof(pinMap)/sizeof(pin_map_t);
//==============================================================================
/** generate bad pin number error */
void badPinNumber(void)
__attribute__((error("Pin number is too large or not a constant")));
//------------------------------------------------------------------------------
/** Check for valid pin number
* @param[in] pin Number of pin to be checked.
*/
static inline __attribute__((always_inline))
void badPinCheck(uint8_t pin) {
if (!__builtin_constant_p(pin) || pin >= digitalPinCount) {
badPinNumber();
}
}
//------------------------------------------------------------------------------
/** fast write helper
* @param[in] address I/O register address
* @param[in] bit bit number to write
* @param[in] level value for bit
*/
static inline __attribute__((always_inline))
void fastBitWriteSafe(volatile uint8_t* address, uint8_t bit, bool level) {
uint8_t oldSREG;
if (address > (uint8_t*)0X5F) {
oldSREG = SREG;
cli();
}
if (level) {
*address |= 1 << bit;
} else {
*address &= ~(1 << bit);
}
if (address > (uint8_t*)0X5F) {
SREG = oldSREG;
}
}
//------------------------------------------------------------------------------
/** read pin value
* @param[in] pin Arduino pin number
* @return value read
*/
static inline __attribute__((always_inline))
bool fastDigitalRead(uint8_t pin) {
badPinCheck(pin);
return (*pinMap[pin].pin >> pinMap[pin].bit) & 1;
}
//------------------------------------------------------------------------------
/** toggle a pin
* @param[in] pin Arduino pin number
*
* If the pin is in output mode toggle the pin level.
* If the pin is in input mode toggle the state of the 20K pullup.
*/
static inline __attribute__((always_inline))
void fastDigitalToggle(uint8_t pin) {
badPinCheck(pin);
if (pinMap[pin].pin > (uint8_t*)0X5F) {
// must write bit to high address port
*pinMap[pin].pin = 1 << pinMap[pin].bit;
} else {
// will compile to sbi and PIN register will not be read.
*pinMap[pin].pin |= 1 << pinMap[pin].bit;
}
}
//------------------------------------------------------------------------------
/** Set pin value
* @param[in] pin Arduino pin number
* @param[in] level value to write
*/
static inline __attribute__((always_inline))
void fastDigitalWrite(uint8_t pin, bool level) {
badPinCheck(pin);
fastBitWriteSafe(pinMap[pin].port, pinMap[pin].bit, level);
}
//------------------------------------------------------------------------------
/** set pin mode
* @param[in] pin Arduino pin number
* @param[in] mode if true set output mode else input mode
*
* fastPinMode does not enable or disable the 20K pullup for input mode.
*/
static inline __attribute__((always_inline))
void fastPinMode(uint8_t pin, bool mode) {
badPinCheck(pin);
fastBitWriteSafe(pinMap[pin].ddr, pinMap[pin].bit, mode);
}
#endif // __arm__
//------------------------------------------------------------------------------
/** set pin configuration
* @param[in] pin Arduino pin number
* @param[in] mode If true set output mode else input mode
* @param[in] level If mode is output, set level high/low.
* If mode is input, enable or disable the pin's 20K pullup.
*/
static inline __attribute__((always_inline))
void fastPinConfig(uint8_t pin, bool mode, bool level) {
fastPinMode(pin, mode);
fastDigitalWrite(pin, level);
}
//==============================================================================
/**
* @class DigitalPin
* @brief Fast digital port I/O
*/
template<uint8_t PinNumber>
class DigitalPin {
public:
//----------------------------------------------------------------------------
/** Constructor */
DigitalPin() {}
//----------------------------------------------------------------------------
/** Constructor
* @param[in] pinMode if true set output mode else input mode.
*/
explicit DigitalPin(bool pinMode) {
mode(pinMode);
}
//----------------------------------------------------------------------------
/** Constructor
* @param[in] mode If true set output mode else input mode
* @param[in] level If mode is output, set level high/low.
* If mode is input, enable or disable the pin's 20K pullup.
*/
DigitalPin(bool mode, bool level) {
config(mode, level);
}
//----------------------------------------------------------------------------
/** Asignment operator
* @param[in] value If true set the pin's level high else set the
* pin's level low.
*
* @return This DigitalPin instance.
*/
inline DigitalPin & operator = (bool value) __attribute__((always_inline)) {
write(value);
return *this;
}
//----------------------------------------------------------------------------
/** Parenthesis operator
* @return Pin's level
*/
inline operator bool () const __attribute__((always_inline)) {
return read();
}
//----------------------------------------------------------------------------
/** set pin configuration
* @param[in] mode If true set output mode else input mode
* @param[in] level If mode is output, set level high/low.
* If mode is input, enable or disable the pin's 20K pullup.
*/
inline __attribute__((always_inline))
void config(bool mode, bool level) {
fastPinConfig(PinNumber, mode, level);
}
//----------------------------------------------------------------------------
/**
* Set pin level high if output mode or enable 20K pullup if input mode.
*/
inline __attribute__((always_inline))
void high() {write(true);}
//----------------------------------------------------------------------------
/**
* Set pin level low if output mode or disable 20K pullup if input mode.
*/
inline __attribute__((always_inline))
void low() {write(false);}
//----------------------------------------------------------------------------
/**
* Set pin mode
* @param[in] pinMode if true set output mode else input mode.
*
* mode() does not enable or disable the 20K pullup for input mode.
*/
inline __attribute__((always_inline))
void mode(bool pinMode) {
fastPinMode(PinNumber, pinMode);
}
//----------------------------------------------------------------------------
/** @return Pin's level */
inline __attribute__((always_inline))
bool read() const {
return fastDigitalRead(PinNumber);
}
//----------------------------------------------------------------------------
/** toggle a pin
*
* If the pin is in output mode toggle the pin's level.
* If the pin is in input mode toggle the state of the 20K pullup.
*/
inline __attribute__((always_inline))
void toggle() {
fastDigitalToggle(PinNumber);
}
//----------------------------------------------------------------------------
/** Write the pin's level.
* @param[in] value If true set the pin's level high else set the
* pin's level low.
*/
inline __attribute__((always_inline))
void write(bool value) {
fastDigitalWrite(PinNumber, value);
}
};
//------------------------------------------------------------------------------
/** Nop for timing. */
#define nop asm volatile ("nop\n\t")
//------------------------------------------------------------------------------
/** Pin Mode for MISO is input.*/
const bool MISO_MODE = false;
/** Pullups disabled for MISO are disabled. */
const bool MISO_LEVEL = false;
/** Pin Mode for MOSI is output.*/
const bool MOSI_MODE = true;
/** Pin Mode for SCK is output. */
const bool SCK_MODE = true;
//------------------------------------------------------------------------------
/**
* @class SoftSPI
* @brief Fast software SPI.
*/
template<uint8_t MisoPin, uint8_t MosiPin, uint8_t SckPin, uint8_t Mode = 0>
class SoftSPI {
public:
//----------------------------------------------------------------------------
/** Initialize SoftSPI pins. */
void begin() {
fastPinConfig(MisoPin, MISO_MODE, MISO_LEVEL);
fastPinConfig(MosiPin, MOSI_MODE, !MODE_CPHA(Mode));
fastPinConfig(SckPin, SCK_MODE, MODE_CPOL(Mode));
}
//----------------------------------------------------------------------------
/** Soft SPI receive byte.
* @return Data byte received.
*/
inline __attribute__((always_inline))
uint8_t receive() {
uint8_t data = 0;
receiveBit(7, &data);
receiveBit(6, &data);
receiveBit(5, &data);
receiveBit(4, &data);
receiveBit(3, &data);
receiveBit(2, &data);
receiveBit(1, &data);
receiveBit(0, &data);
return data;
}
//----------------------------------------------------------------------------
/** Soft SPI send byte.
* @param[in] data Data byte to send.
*/
inline __attribute__((always_inline))
void send(uint8_t data) {
sendBit(7, data);
sendBit(6, data);
sendBit(5, data);
sendBit(4, data);
sendBit(3, data);
sendBit(2, data);
sendBit(1, data);
sendBit(0, data);
}
//----------------------------------------------------------------------------
/** Soft SPI transfer byte.
* @param[in] txData Data byte to send.
* @return Data byte received.
*/
inline __attribute__((always_inline))
uint8_t transfer(uint8_t txData) {
uint8_t rxData = 0;
transferBit(7, &rxData, txData);
transferBit(6, &rxData, txData);
transferBit(5, &rxData, txData);
transferBit(4, &rxData, txData);
transferBit(3, &rxData, txData);
transferBit(2, &rxData, txData);
transferBit(1, &rxData, txData);
transferBit(0, &rxData, txData);
return rxData;
}
private:
//----------------------------------------------------------------------------
inline __attribute__((always_inline))
bool MODE_CPHA(uint8_t mode) {return (mode & 1) != 0;}
inline __attribute__((always_inline))
bool MODE_CPOL(uint8_t mode) {return (mode & 2) != 0;}
inline __attribute__((always_inline))
void receiveBit(uint8_t bit, uint8_t* data) {
if (MODE_CPHA(Mode)) {
fastDigitalWrite(SckPin, !MODE_CPOL(Mode));
}
nop;
nop;
fastDigitalWrite(SckPin,
MODE_CPHA(Mode) ? MODE_CPOL(Mode) : !MODE_CPOL(Mode));
if (fastDigitalRead(MisoPin)) *data |= 1 << bit;
if (!MODE_CPHA(Mode)) {
fastDigitalWrite(SckPin, MODE_CPOL(Mode));
}
}
//----------------------------------------------------------------------------
inline __attribute__((always_inline))
void sendBit(uint8_t bit, uint8_t data) {
if (MODE_CPHA(Mode)) {
fastDigitalWrite(SckPin, !MODE_CPOL(Mode));
}
fastDigitalWrite(MosiPin, data & (1 << bit));
fastDigitalWrite(SckPin,
MODE_CPHA(Mode) ? MODE_CPOL(Mode) : !MODE_CPOL(Mode));
nop;
nop;
if (!MODE_CPHA(Mode)) {
fastDigitalWrite(SckPin, MODE_CPOL(Mode));
}
}
//----------------------------------------------------------------------------
inline __attribute__((always_inline))
void transferBit(uint8_t bit, uint8_t* rxData, uint8_t txData) {
if (MODE_CPHA(Mode)) {
fastDigitalWrite(SckPin, !MODE_CPOL(Mode));
}
fastDigitalWrite(MosiPin, txData & (1 << bit));
fastDigitalWrite(SckPin,
MODE_CPHA(Mode) ? MODE_CPOL(Mode) : !MODE_CPOL(Mode));
if (fastDigitalRead(MisoPin)) *rxData |= 1 << bit;
if (!MODE_CPHA(Mode)) {
fastDigitalWrite(SckPin, MODE_CPOL(Mode));
}
}
//----------------------------------------------------------------------------
};
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