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Optimized digitalWrite(), etc. from Alvaro Lopez.

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commit 9dccd634c5ff1fed88459e39b277794dbba039fb 1 parent 80bb16d
David A. Mellis damellis authored
452 hardware/arduino/cores/arduino/pins_arduino.h
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@@ -49,6 +49,10 @@
#define TIMER5B 15
#define TIMER5C 16
+#ifndef INLINED
+#define INLINED static __attribute__((always_inline)) inline
+#endif
+
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
const static uint8_t SS = 53;
const static uint8_t MOSI = 51;
@@ -72,17 +76,447 @@ extern const uint8_t PROGMEM digital_pin_to_port_PGM[];
extern const uint8_t PROGMEM digital_pin_to_bit_mask_PGM[];
extern const uint8_t PROGMEM digital_pin_to_timer_PGM[];
+// inlined versions of lookup-table-based pin mappings. Don't use directly.
+
+// Don't use PA, so on, might clash with sketch
+
+#define PORT_INDEX_PA 1
+#define PORT_INDEX_PB 2
+#define PORT_INDEX_PC 3
+#define PORT_INDEX_PD 4
+#define PORT_INDEX_PE 5
+#define PORT_INDEX_PF 6
+#define PORT_INDEX_PG 7
+#define PORT_INDEX_PH 8
+#define PORT_INDEX_PJ 10
+#define PORT_INDEX_PK 11
+#define PORT_INDEX_PL 12
+
+__attribute__((error("Invalid pin specified. This pin does not map to any I/O port"))) static void invalidPinSpecified(void);
+
+
+#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+
+INLINED volatile uint8_t *inlined_portModeRegister(uint8_t port_index)
+{
+ switch (port_index) {
+ case 1: return &DDRA;
+ case 2: return &DDRB;
+ case 3: return &DDRC;
+ case 4: return &DDRD;
+ case 5: return &DDRE;
+ case 6: return &DDRF;
+ case 7: return &DDRG;
+ case 8: return &DDRH;
+ case 10: return &DDRJ;
+ case 11: return &DDRK;
+ case 12: return &DDRL;
+ default: return NOT_A_PORT;
+ }
+}
+
+INLINED volatile uint8_t *inlined_portOutputRegister(uint8_t port_index)
+{
+ switch (port_index) {
+ case 1: return &PORTA;
+ case 2: return &PORTB;
+ case 3: return &PORTC;
+ case 4: return &PORTD;
+ case 5: return &PORTE;
+ case 6: return &PORTF;
+ case 7: return &PORTG;
+ case 8: return &PORTH;
+ case 10: return &PORTJ;
+ case 11: return &PORTK;
+ case 12: return &PORTL;
+ default: return NOT_A_PORT;
+ }
+}
+
+INLINED volatile uint8_t *inlined_portInputRegister(uint8_t port_index)
+{
+ switch (port_index) {
+ case 1: return &PINA;
+ case 2: return &PINB;
+ case 3: return &PINC;
+ case 4: return &PIND;
+ case 5: return &PINE;
+ case 6: return &PINF;
+ case 7: return &PING;
+ case 8: return &PINH;
+ case 10: return &PINJ;
+ case 11: return &PINK;
+ case 12: return &PINL;
+ default: return NOT_A_PIN;
+ }
+};
+
+INLINED uint8_t inlined_digitalPinToPort(uint8_t pin)
+{
+ switch (pin) {
+ case 0: // PE 0 ** 0 ** USART0_RX
+ case 1: // PE 1 ** 1 ** USART0_TX
+ case 2: // PE 4 ** 2 ** PWM2
+ case 3: // PE 5 ** 3 ** PWM3
+ return PORT_INDEX_PE;
+
+ case 4: // PG 5 ** 4 ** PWM4
+ return PORT_INDEX_PG;
+
+ case 5: // PE 3 ** 5 ** PWM5
+ return PORT_INDEX_PE;
+
+ case 6: // PH 3 ** 6 ** PWM6
+ case 7: // PH 4 ** 7 ** PWM7
+ case 8: // PH 5 ** 8 ** PWM8
+ case 9: // PH 6 ** 9 ** PWM9
+ return PORT_INDEX_PH;
+
+ case 10: // PB 4 ** 10 ** PWM10
+ case 11: // PB 5 ** 11 ** PWM11
+ case 12: // PB 6 ** 12 ** PWM12
+ case 13: // PB 7 ** 13 ** PWM13
+ return PORT_INDEX_PB;
+
+ case 14: // PJ 1 ** 14 ** USART3_TX
+ case 15: // PJ 0 ** 15 ** USART3_RX
+ return PORT_INDEX_PJ;
+
+ case 16: // PH 1 ** 16 ** USART2_TX
+ case 17: // PH 0 ** 17 ** USART2_RX
+ return PORT_INDEX_PH;
+
+ case 18: // PD 3 ** 18 ** USART1_TX
+ case 19: // PD 2 ** 19 ** USART1_RX
+ case 20: // PD 1 ** 20 ** I2C_SDA
+ case 21: // PD 0 ** 21 ** I2C_SCL
+ return PORT_INDEX_PD;
+
+ case 22: // PA 0 ** 22 ** D22
+ case 23: // PA 1 ** 23 ** D23
+ case 24: // PA 2 ** 24 ** D24
+ case 25: // PA 3 ** 25 ** D25
+ case 26: // PA 4 ** 26 ** D26
+ case 27: // PA 5 ** 27 ** D27
+ case 28: // PA 6 ** 28 ** D28
+ case 29: // PA 7 ** 29 ** D29
+ return PORT_INDEX_PA;
+
+ case 30: // PC 7 ** 30 ** D30
+ case 31: // PC 6 ** 31 ** D31
+ case 32: // PC 5 ** 32 ** D32
+ case 33: // PC 4 ** 33 ** D33
+ case 34: // PC 3 ** 34 ** D34
+ case 35: // PC 2 ** 35 ** D35
+ case 36: // PC 1 ** 36 ** D36
+ case 37: // PC 0 ** 37 ** D37
+ return PORT_INDEX_PC;
+
+ case 38: // PD 7 ** 38 ** D38
+ return PORT_INDEX_PD;
+
+ case 39: // PG 2 ** 39 ** D39
+ case 40: // PG 1 ** 40 ** D40
+ case 41: // PG 0 ** 41 ** D41
+ return PORT_INDEX_PG;
+
+ case 42: // PL 7 ** 42 ** D42
+ case 43: // PL 6 ** 43 ** D43
+ case 44: // PL 5 ** 44 ** D44
+ case 45: // PL 4 ** 45 ** D45
+ case 46: // PL 3 ** 46 ** D46
+ case 47: // PL 2 ** 47 ** D47
+ case 48: // PL 1 ** 48 ** D48
+ case 49: // PL 0 ** 49 ** D49
+ return PORT_INDEX_PL;
+
+ case 50: // PB 3 ** 50 ** SPI_MISO
+ case 51: // PB 2 ** 51 ** SPI_MOSI
+ case 52: // PB 1 ** 52 ** SPI_SCK
+ case 53: // PB 0 ** 53 ** SPI_SS
+ return PORT_INDEX_PB;
+
+ case 54: // PF 0 ** 54 ** A0
+ case 55: // PF 1 ** 55 ** A1
+ case 56: // PF 2 ** 56 ** A2
+ case 57: // PF 3 ** 57 ** A3
+ case 58: // PF 4 ** 58 ** A4
+ case 59: // PF 5 ** 59 ** A5
+ case 60: // PF 6 ** 60 ** A6
+ case 61: // PF 7 ** 61 ** A7
+ return PORT_INDEX_PF;
+
+ case 62: // PK 0 ** 62 ** A8
+ case 63: // PK 1 ** 63 ** A9
+ case 64: // PK 2 ** 64 ** A10
+ case 65: // PK 3 ** 65 ** A11
+ case 66: // PK 4 ** 66 ** A12
+ case 67: // PK 5 ** 67 ** A13
+ case 68: // PK 6 ** 68 ** A14
+ case 69: // PK 7 ** 69 ** A15
+ return PORT_INDEX_PK;
+ default:
+ invalidPinSpecified();
+ }
+}
+
+INLINED uint8_t inlined_digitalPinToBitMask(uint8_t pin)
+{
+ switch(pin) {
+ case 0: return _BV( 0 ); // PE 0 ** 0 ** USART0_RX
+ case 1: return _BV( 1 ); // PE 1 ** 1 ** USART0_TX
+ case 2: return _BV( 4 ); // PE 4 ** 2 ** PWM2
+ case 3: return _BV( 5 ); // PE 5 ** 3 ** PWM3
+ case 4: return _BV( 5 ); // PG 5 ** 4 ** PWM4
+ case 5: return _BV( 3 ); // PE 3 ** 5 ** PWM5
+ case 6: return _BV( 3 ); // PH 3 ** 6 ** PWM6
+ case 7: return _BV( 4 ); // PH 4 ** 7 ** PWM7
+ case 8: return _BV( 5 ); // PH 5 ** 8 ** PWM8
+ case 9: return _BV( 6 ); // PH 6 ** 9 ** PWM9
+ case 10: return _BV( 4 ); // PB 4 ** 10 ** PWM10
+ case 11: return _BV( 5 ); // PB 5 ** 11 ** PWM11
+ case 12: return _BV( 6 ); // PB 6 ** 12 ** PWM12
+ case 13: return _BV( 7 ); // PB 7 ** 13 ** PWM13
+ case 14: return _BV( 1 ); // PJ 1 ** 14 ** USART3_TX
+ case 15: return _BV( 0 ); // PJ 0 ** 15 ** USART3_RX
+ case 16: return _BV( 1 ); // PH 1 ** 16 ** USART2_TX
+ case 17: return _BV( 0 ); // PH 0 ** 17 ** USART2_RX
+ case 18: return _BV( 3 ); // PD 3 ** 18 ** USART1_TX
+ case 19: return _BV( 2 ); // PD 2 ** 19 ** USART1_RX
+ case 20: return _BV( 1 ); // PD 1 ** 20 ** I2C_SDA
+ case 21: return _BV( 0 ); // PD 0 ** 21 ** I2C_SCL
+ case 22: return _BV( 0 ); // PA 0 ** 22 ** D22
+ case 23: return _BV( 1 ); // PA 1 ** 23 ** D23
+ case 24: return _BV( 2 ); // PA 2 ** 24 ** D24
+ case 25: return _BV( 3 ); // PA 3 ** 25 ** D25
+ case 26: return _BV( 4 ); // PA 4 ** 26 ** D26
+ case 27: return _BV( 5 ); // PA 5 ** 27 ** D27
+ case 28: return _BV( 6 ); // PA 6 ** 28 ** D28
+ case 29: return _BV( 7 ); // PA 7 ** 29 ** D29
+ case 30: return _BV( 7 ); // PC 7 ** 30 ** D30
+ case 31: return _BV( 6 ); // PC 6 ** 31 ** D31
+ case 32: return _BV( 5 ); // PC 5 ** 32 ** D32
+ case 33: return _BV( 4 ); // PC 4 ** 33 ** D33
+ case 34: return _BV( 3 ); // PC 3 ** 34 ** D34
+ case 35: return _BV( 2 ); // PC 2 ** 35 ** D35
+ case 36: return _BV( 1 ); // PC 1 ** 36 ** D36
+ case 37: return _BV( 0 ); // PC 0 ** 37 ** D37
+ case 38: return _BV( 7 ); // PD 7 ** 38 ** D38
+ case 39: return _BV( 2 ); // PG 2 ** 39 ** D39
+ case 40: return _BV( 1 ); // PG 1 ** 40 ** D40
+ case 41: return _BV( 0 ); // PG 0 ** 41 ** D41
+ case 42: return _BV( 7 ); // PL 7 ** 42 ** D42
+ case 43: return _BV( 6 ); // PL 6 ** 43 ** D43
+ case 44: return _BV( 5 ); // PL 5 ** 44 ** D44
+ case 45: return _BV( 4 ); // PL 4 ** 45 ** D45
+ case 46: return _BV( 3 ); // PL 3 ** 46 ** D46
+ case 47: return _BV( 2 ); // PL 2 ** 47 ** D47
+ case 48: return _BV( 1 ); // PL 1 ** 48 ** D48
+ case 49: return _BV( 0 ); // PL 0 ** 49 ** D49
+ case 50: return _BV( 3 ); // PB 3 ** 50 ** SPI_MISO
+ case 51: return _BV( 2 ); // PB 2 ** 51 ** SPI_MOSI
+ case 52: return _BV( 1 ); // PB 1 ** 52 ** SPI_SCK
+ case 53: return _BV( 0 ); // PB 0 ** 53 ** SPI_SS
+ case 54: return _BV( 0 ); // PF 0 ** 54 ** A0
+ case 55: return _BV( 1 ); // PF 1 ** 55 ** A1
+ case 56: return _BV( 2 ); // PF 2 ** 56 ** A2
+ case 57: return _BV( 3 ); // PF 3 ** 57 ** A3
+ case 58: return _BV( 4 ); // PF 4 ** 58 ** A4
+ case 59: return _BV( 5 ); // PF 5 ** 59 ** A5
+ case 60: return _BV( 6 ); // PF 6 ** 60 ** A6
+ case 61: return _BV( 7 ); // PF 7 ** 61 ** A7
+ case 62: return _BV( 0 ); // PK 0 ** 62 ** A8
+ case 63: return _BV( 1 ); // PK 1 ** 63 ** A9
+ case 64: return _BV( 2 ); // PK 2 ** 64 ** A10
+ case 65: return _BV( 3 ); // PK 3 ** 65 ** A11
+ case 66: return _BV( 4 ); // PK 4 ** 66 ** A12
+ case 67: return _BV( 5 ); // PK 5 ** 67 ** A13
+ case 68: return _BV( 6 ); // PK 6 ** 68 ** A14
+ case 69: return _BV( 7 ); // PK 7 ** 69 ** A15
+ default:
+ // TODO: add error here
+ invalidPinSpecified();
+ }
+}
+
+INLINED uint8_t inlined_digitalPinToTimer(uint8_t pin)
+{
+ switch(pin) {
+ case 2: return TIMER3B; // PE 4 ** 2 ** PWM2
+ case 3: return TIMER3C; // PE 5 ** 3 ** PWM3
+ case 4: return TIMER0B; // PG 5 ** 4 ** PWM4
+ case 5: return TIMER3A; // PE 3 ** 5 ** PWM5
+ case 6: return TIMER4A; // PH 3 ** 6 ** PWM6
+ case 7: return TIMER4B; // PH 4 ** 7 ** PWM7
+ case 8: return TIMER4C; // PH 5 ** 8 ** PWM8
+ case 9: return TIMER2B; // PH 6 ** 9 ** PWM9
+ case 10: return TIMER2A; // PB 4 ** 10 ** PWM10
+ case 11: return TIMER1A; // PB 5 ** 11 ** PWM11
+ case 12: return TIMER1B; // PB 6 ** 12 ** PWM12
+ case 13: return TIMER0A; // PB 7 ** 13 ** PWM13
+ case 44: return TIMER5C; // PL 5 ** 44 ** D44
+ case 45: return TIMER5B; // PL 4 ** 45 ** D45
+ case 46: return TIMER5A; // PL 3 ** 46 ** D46
+ default: invalidPinSpecified();
+ }
+}
+
+#else // defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+
+INLINED volatile uint8_t *inlined_portModeRegister(uint8_t port_index)
+{
+ switch (port_index) {
+ case 2: return &DDRB;
+ case 3: return &DDRC;
+ case 4: return &DDRD;
+ default: invalidPinSpecified();
+ }
+}
+
+INLINED volatile uint8_t *inlined_portOutputRegister(uint8_t port_index)
+{
+ switch (port_index) {
+ case 2: return &PORTB;
+ case 3: return &PORTC;
+ case 4: return &PORTD;
+ default: invalidPinSpecified();
+ }
+}
+
+INLINED volatile uint8_t *inlined_portInputRegister(uint8_t port_index)
+{
+ switch (port_index) {
+ case 2: return &PINB;
+ case 3: return &PINC;
+ case 4: return &PIND;
+ default: invalidPinSpecified();
+ }
+}
+
+INLINED uint8_t inlined_digitalPinToPort(uint8_t pin)
+{
+ switch(pin) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ case 6:
+ case 7:
+ return PORT_INDEX_PD;
+ case 8:
+ case 9:
+ case 10:
+ case 11:
+ case 12:
+ case 13:
+ return PORT_INDEX_PB;
+ case 14:
+ case 15:
+ case 16:
+ case 17:
+ case 18:
+ case 19:
+ return PORT_INDEX_PC;
+ default:
+ invalidPinSpecified();
+ }
+}
+
+INLINED uint8_t inlined_digitalPinToBitMask(uint8_t pin)
+{
+ switch(pin) {
+ case 0: return _BV(0); /* 0, port D */
+ case 1: return _BV(1);
+ case 2: return _BV(2);
+ case 3: return _BV(3);
+ case 4: return _BV(4);
+ case 5: return _BV(5);
+ case 6: return _BV(6);
+ case 7: return _BV(7);
+ case 8: return _BV(0); /* 8, port B */
+ case 9: return _BV(1);
+ case 10: return _BV(2);
+ case 11: return _BV(3);
+ case 12: return _BV(4);
+ case 13: return _BV(5);
+ case 14: return _BV(0); /* 14, port C */
+ case 15: return _BV(1);
+ case 16: return _BV(2);
+ case 17: return _BV(3);
+ case 18: return _BV(4);
+ case 19: return _BV(5);
+ default:
+ // TODO: throw error here
+ invalidPinSpecified();
+ }
+}
+
+INLINED uint8_t inlined_digitalPinToTimer(uint8_t pin)
+{
+ switch(pin) {
+#if defined(__AVR_ATmega8__)
+ case 11: return TIMER2;
+#else
+ case 3: return TIMER2B;
+ case 5: return TIMER0B;
+ case 6: return TIMER0A;
+ case 11: return TIMER2A;
+#endif
+ case 9: return TIMER1A;
+ case 10: return TIMER1B;
+ default: invalidPinSpecified();
+ }
+}
+
+#endif // defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+
// Get the bit location within the hardware port of the given virtual pin.
// This comes from the pins_*.c file for the active board configuration.
-//
-// These perform slightly better as macros compared to inline functions
-//
-#define digitalPinToPort(P) ( pgm_read_byte( digital_pin_to_port_PGM + (P) ) )
-#define digitalPinToBitMask(P) ( pgm_read_byte( digital_pin_to_bit_mask_PGM + (P) ) )
-#define digitalPinToTimer(P) ( pgm_read_byte( digital_pin_to_timer_PGM + (P) ) )
+
#define analogInPinToBit(P) (P)
-#define portOutputRegister(P) ( (volatile uint8_t *)( pgm_read_word( port_to_output_PGM + (P))) )
-#define portInputRegister(P) ( (volatile uint8_t *)( pgm_read_word( port_to_input_PGM + (P))) )
-#define portModeRegister(P) ( (volatile uint8_t *)( pgm_read_word( port_to_mode_PGM + (P))) )
+
+INLINED uint8_t digitalPinToPort(uint8_t pin) {
+ if (__builtin_constant_p(pin))
+ return inlined_digitalPinToPort(pin);
+ else
+ return pgm_read_byte( digital_pin_to_port_PGM + pin );
+}
+
+INLINED uint8_t digitalPinToBitMask(uint8_t pin) {
+ if (__builtin_constant_p(pin))
+ return inlined_digitalPinToBitMask(pin);
+ else
+ return pgm_read_byte( digital_pin_to_bit_mask_PGM + pin );
+}
+
+INLINED uint8_t digitalPinToTimer(uint8_t pin) {
+ if (__builtin_constant_p(pin))
+ return inlined_digitalPinToTimer(pin);
+ else
+ return pgm_read_byte( digital_pin_to_timer_PGM + pin );
+}
+
+INLINED volatile uint8_t *portOutputRegister(uint8_t index) {
+ if (__builtin_constant_p(index))
+ return inlined_portOutputRegister(index);
+ else
+ return (volatile uint8_t *)( pgm_read_word( port_to_output_PGM + index ) );
+}
+
+INLINED volatile uint8_t* portInputRegister(uint8_t index) {
+ if (__builtin_constant_p(index))
+ return inlined_portInputRegister(index);
+ else
+ return (volatile uint8_t *)( pgm_read_word( port_to_input_PGM + index) );
+}
+
+INLINED volatile uint8_t* portModeRegister(uint8_t index) {
+ if (__builtin_constant_p(index))
+ return inlined_portModeRegister(index);
+ else
+ return (volatile uint8_t *)( pgm_read_word( port_to_mode_PGM + index) );
+}
#endif
73 hardware/arduino/cores/arduino/wiring.h
View
@@ -26,8 +26,10 @@
#define Wiring_h
#include <avr/io.h>
+#include <avr/interrupt.h>
#include <stdlib.h>
#include "binary.h"
+#include "pins_arduino.h"
#ifdef __cplusplus
extern "C"{
@@ -106,9 +108,9 @@ typedef uint8_t byte;
void init(void);
-void pinMode(uint8_t, uint8_t);
-void digitalWrite(uint8_t, uint8_t);
-int digitalRead(uint8_t);
+void pinMode_lookup(uint8_t, uint8_t);
+void digitalWrite_lookup(uint8_t, uint8_t);
+int digitalRead_lookup(uint8_t);
int analogRead(uint8_t);
void analogReference(uint8_t mode);
void analogWrite(uint8_t, int);
@@ -128,6 +130,71 @@ void detachInterrupt(uint8_t);
void setup(void);
void loop(void);
+/*
+ * Check if a given pin requires locking.
+ * When accessing lower 32 IO ports we can use SBI/CBI instructions, which are atomic. However
+ * other IO ports require load+modify+store and we need to make them atomic by disabling
+ * interrupts.
+ */
+INLINED int portWriteNeedsLocking(uint8_t pin)
+{
+ /* SBI/CBI instructions only work on lower 32 IO ports */
+ if (inlined_portOutputRegister(inlined_digitalPinToPort(pin)) > (volatile uint8_t*)&_SFR_IO8(0x1F)) {
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * These functions will perform OR/AND on a given register, and are atomic.
+ */
+extern void __digitalWriteOR_locked(volatile uint8_t*out, uint8_t bit);
+extern void __digitalWriteAND_locked(volatile uint8_t*out, uint8_t bit);
+
+INLINED void digitalWrite(uint8_t pin, uint8_t value)
+{
+ if (__builtin_constant_p(pin)) {
+ if (portWriteNeedsLocking(pin)) {
+ if (value==LOW) {
+ __digitalWriteAND_locked(inlined_portOutputRegister(inlined_digitalPinToPort(pin)),~inlined_digitalPinToBitMask(pin));
+ } else {
+ __digitalWriteOR_locked(inlined_portOutputRegister(inlined_digitalPinToPort(pin)),inlined_digitalPinToBitMask(pin));
+ }
+ } else {
+ if (value==LOW) {
+ *inlined_portOutputRegister(inlined_digitalPinToPort(pin)) &= ~(inlined_digitalPinToBitMask(pin));
+ } else {
+ *inlined_portOutputRegister(inlined_digitalPinToPort(pin)) |= inlined_digitalPinToBitMask(pin);
+ }
+ }
+ } else {
+ digitalWrite_lookup(pin,value);
+ }
+}
+
+INLINED void pinMode(uint8_t pin, uint8_t mode)
+{
+ if (__builtin_constant_p(pin)) {
+ if (mode==INPUT) {
+ *inlined_portModeRegister(inlined_digitalPinToPort(pin)) &= ~(inlined_digitalPinToBitMask(pin));
+ } else {
+ *inlined_portModeRegister(inlined_digitalPinToPort(pin)) |= inlined_digitalPinToBitMask(pin);
+ }
+ } else {
+ pinMode_lookup(pin,mode);
+ }
+}
+
+INLINED int digitalRead(uint8_t pin)
+{
+ if (__builtin_constant_p(pin)) {
+ return !! *inlined_portInputRegister(inlined_digitalPinToPort(pin));
+ } else {
+ return digitalRead_lookup(pin);
+ }
+}
+
+
#ifdef __cplusplus
} // extern "C"
#endif
33 hardware/arduino/cores/arduino/wiring_digital.c
View
@@ -27,7 +27,7 @@
#include "wiring_private.h"
#include "pins_arduino.h"
-void pinMode(uint8_t pin, uint8_t mode)
+void pinMode_lookup(uint8_t pin, uint8_t mode)
{
uint8_t bit = digitalPinToBitMask(pin);
uint8_t port = digitalPinToPort(pin);
@@ -121,7 +121,23 @@ static void turnOffPWM(uint8_t timer)
}
}
-void digitalWrite(uint8_t pin, uint8_t val)
+void __digitalWriteOR_locked(volatile uint8_t*out, uint8_t bit)
+{
+ uint8_t oldSREG = SREG;
+ cli();
+ *out |= bit;
+ SREG=oldSREG;
+}
+
+void __digitalWriteAND_locked(volatile uint8_t*out, uint8_t bit)
+{
+ uint8_t oldSREG = SREG;
+ cli();
+ *out &= bit; // NOTE - no inversion here, invert before calling!!!
+ SREG=oldSREG;
+}
+
+void digitalWrite_lookup(uint8_t pin, uint8_t val)
{
uint8_t timer = digitalPinToTimer(pin);
uint8_t bit = digitalPinToBitMask(pin);
@@ -136,20 +152,19 @@ void digitalWrite(uint8_t pin, uint8_t val)
out = portOutputRegister(port);
+ uint8_t oldSREG = SREG;
+ cli();
+
if (val == LOW) {
- uint8_t oldSREG = SREG;
- cli();
*out &= ~bit;
- SREG = oldSREG;
} else {
- uint8_t oldSREG = SREG;
- cli();
*out |= bit;
- SREG = oldSREG;
}
+
+ SREG = oldSREG;
}
-int digitalRead(uint8_t pin)
+int digitalRead_lookup(uint8_t pin)
{
uint8_t timer = digitalPinToTimer(pin);
uint8_t bit = digitalPinToBitMask(pin);
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