diff options
Diffstat (limited to 'libraries/SPI/SPI.cpp')
| -rw-r--r-- | libraries/SPI/SPI.cpp | 201 |
1 files changed, 0 insertions, 201 deletions
diff --git a/libraries/SPI/SPI.cpp b/libraries/SPI/SPI.cpp deleted file mode 100644 index af14e07..0000000 --- a/libraries/SPI/SPI.cpp +++ /dev/null @@ -1,201 +0,0 @@ -/* - * Copyright (c) 2010 by Cristian Maglie <c.maglie@arduino.cc> - * Copyright (c) 2014 by Paul Stoffregen <paul@pjrc.com> (Transaction API) - * Copyright (c) 2014 by Matthijs Kooijman <matthijs@stdin.nl> (SPISettings AVR) - * Copyright (c) 2014 by Andrew J. Kroll <xxxajk@gmail.com> (atomicity fixes) - * SPI Master library for arduino. - * - * This file is free software; you can redistribute it and/or modify - * it under the terms of either the GNU General Public License version 2 - * or the GNU Lesser General Public License version 2.1, both as - * published by the Free Software Foundation. - */ - -#include "SPI.h" - -SPIClass SPI; - -uint8_t SPIClass::initialized = 0; -uint8_t SPIClass::interruptMode = 0; -uint8_t SPIClass::interruptMask = 0; -uint8_t SPIClass::interruptSave = 0; -#ifdef SPI_TRANSACTION_MISMATCH_LED -uint8_t SPIClass::inTransactionFlag = 0; -#endif - -void SPIClass::begin() -{ - uint8_t sreg = SREG; - noInterrupts(); // Protect from a scheduler and prevent transactionBegin - if (!initialized) { - // Set SS to high so a connected chip will be "deselected" by default - uint8_t port = digitalPinToPort(SS); - uint8_t bit = digitalPinToBitMask(SS); - volatile uint8_t *reg = portModeRegister(port); - - // if the SS pin is not already configured as an output - // then set it high (to enable the internal pull-up resistor) - if(!(*reg & bit)){ - digitalWrite(SS, HIGH); - } - - // When the SS pin is set as OUTPUT, it can be used as - // a general purpose output port (it doesn't influence - // SPI operations). - pinMode(SS, OUTPUT); - - // Warning: if the SS pin ever becomes a LOW INPUT then SPI - // automatically switches to Slave, so the data direction of - // the SS pin MUST be kept as OUTPUT. - SPCR |= _BV(MSTR); - SPCR |= _BV(SPE); - - // Set direction register for SCK and MOSI pin. - // MISO pin automatically overrides to INPUT. - // By doing this AFTER enabling SPI, we avoid accidentally - // clocking in a single bit since the lines go directly - // from "input" to SPI control. - // http://code.google.com/p/arduino/issues/detail?id=888 - pinMode(SCK, OUTPUT); - pinMode(MOSI, OUTPUT); - } - initialized++; // reference count - SREG = sreg; -} - -void SPIClass::end() { - uint8_t sreg = SREG; - noInterrupts(); // Protect from a scheduler and prevent transactionBegin - // Decrease the reference counter - if (initialized) - initialized--; - // If there are no more references disable SPI - if (!initialized) { - SPCR &= ~_BV(SPE); - interruptMode = 0; - #ifdef SPI_TRANSACTION_MISMATCH_LED - inTransactionFlag = 0; - #endif - } - SREG = sreg; -} - -// mapping of interrupt numbers to bits within SPI_AVR_EIMSK -#if defined(__AVR_ATmega32U4__) - #define SPI_INT0_MASK (1<<INT0) - #define SPI_INT1_MASK (1<<INT1) - #define SPI_INT2_MASK (1<<INT2) - #define SPI_INT3_MASK (1<<INT3) - #define SPI_INT4_MASK (1<<INT6) -#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__) - #define SPI_INT0_MASK (1<<INT0) - #define SPI_INT1_MASK (1<<INT1) - #define SPI_INT2_MASK (1<<INT2) - #define SPI_INT3_MASK (1<<INT3) - #define SPI_INT4_MASK (1<<INT4) - #define SPI_INT5_MASK (1<<INT5) - #define SPI_INT6_MASK (1<<INT6) - #define SPI_INT7_MASK (1<<INT7) -#elif defined(EICRA) && defined(EICRB) && defined(EIMSK) - #define SPI_INT0_MASK (1<<INT4) - #define SPI_INT1_MASK (1<<INT5) - #define SPI_INT2_MASK (1<<INT0) - #define SPI_INT3_MASK (1<<INT1) - #define SPI_INT4_MASK (1<<INT2) - #define SPI_INT5_MASK (1<<INT3) - #define SPI_INT6_MASK (1<<INT6) - #define SPI_INT7_MASK (1<<INT7) -#else - #ifdef INT0 - #define SPI_INT0_MASK (1<<INT0) - #endif - #ifdef INT1 - #define SPI_INT1_MASK (1<<INT1) - #endif - #ifdef INT2 - #define SPI_INT2_MASK (1<<INT2) - #endif -#endif - -void SPIClass::usingInterrupt(uint8_t interruptNumber) -{ - uint8_t mask = 0; - uint8_t sreg = SREG; - noInterrupts(); // Protect from a scheduler and prevent transactionBegin - switch (interruptNumber) { - #ifdef SPI_INT0_MASK - case 0: mask = SPI_INT0_MASK; break; - #endif - #ifdef SPI_INT1_MASK - case 1: mask = SPI_INT1_MASK; break; - #endif - #ifdef SPI_INT2_MASK - case 2: mask = SPI_INT2_MASK; break; - #endif - #ifdef SPI_INT3_MASK - case 3: mask = SPI_INT3_MASK; break; - #endif - #ifdef SPI_INT4_MASK - case 4: mask = SPI_INT4_MASK; break; - #endif - #ifdef SPI_INT5_MASK - case 5: mask = SPI_INT5_MASK; break; - #endif - #ifdef SPI_INT6_MASK - case 6: mask = SPI_INT6_MASK; break; - #endif - #ifdef SPI_INT7_MASK - case 7: mask = SPI_INT7_MASK; break; - #endif - default: - interruptMode = 2; - break; - } - interruptMask |= mask; - if (!interruptMode) - interruptMode = 1; - SREG = sreg; -} - -void SPIClass::notUsingInterrupt(uint8_t interruptNumber) -{ - // Once in mode 2 we can't go back to 0 without a proper reference count - if (interruptMode == 2) - return; - uint8_t mask = 0; - uint8_t sreg = SREG; - noInterrupts(); // Protect from a scheduler and prevent transactionBegin - switch (interruptNumber) { - #ifdef SPI_INT0_MASK - case 0: mask = SPI_INT0_MASK; break; - #endif - #ifdef SPI_INT1_MASK - case 1: mask = SPI_INT1_MASK; break; - #endif - #ifdef SPI_INT2_MASK - case 2: mask = SPI_INT2_MASK; break; - #endif - #ifdef SPI_INT3_MASK - case 3: mask = SPI_INT3_MASK; break; - #endif - #ifdef SPI_INT4_MASK - case 4: mask = SPI_INT4_MASK; break; - #endif - #ifdef SPI_INT5_MASK - case 5: mask = SPI_INT5_MASK; break; - #endif - #ifdef SPI_INT6_MASK - case 6: mask = SPI_INT6_MASK; break; - #endif - #ifdef SPI_INT7_MASK - case 7: mask = SPI_INT7_MASK; break; - #endif - default: - break; - // this case can't be reached - } - interruptMask &= ~mask; - if (!interruptMask) - interruptMode = 0; - SREG = sreg; -} |