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Diffstat (limited to 'lib/msp430/wiring_digital.c')
| -rw-r--r-- | lib/msp430/wiring_digital.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/lib/msp430/wiring_digital.c b/lib/msp430/wiring_digital.c new file mode 100644 index 0000000..cf851b3 --- /dev/null +++ b/lib/msp430/wiring_digital.c @@ -0,0 +1,181 @@ +/* + ************************************************************************ + * HardwareSerial.cpp + * + * Arduino core files for MSP430 + * Copyright (c) 2012 Robert Wessels. All right reserved. + * + * + *********************************************************************** + Derived from: + wiring_digital.c - digital input and output functions + Part of Arduino - http://www.arduino.cc/ + + Copyright (c) 2005-2006 David A. Mellis + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General + Public License along with this library; if not, write to the + Free Software Foundation, Inc., 59 Temple Place, Suite 330, + Boston, MA 02111-1307 USA +*/ + +#define ARDUINO_MAIN +#include "wiring_private.h" +#include "pins_energia.h" + +void pinMode(uint8_t pin, uint8_t mode) +{ + uint8_t bit = digitalPinToBitMask(pin); + uint8_t port = digitalPinToPort(pin); + + volatile uint8_t *dir; + volatile uint8_t *ren; + volatile uint8_t *out; + + if (port == NOT_A_PORT) return; + + dir = portDirRegister(port); + ren = portRenRegister(port); + out = portOutputRegister(port); + + if (mode == INPUT) { + *dir &= ~bit; + } else if (mode == INPUT_PULLUP) { + *dir &= ~bit; + *out |= bit; + *ren |= bit; + } else if (mode == INPUT_PULLDOWN) { + *dir &= ~bit; + *out &= ~bit; + *ren |= bit; + } else { + *dir |= bit; + } +} + +void pinMode_int(uint8_t pin, uint8_t mode) +{ + uint8_t bit = digitalPinToBitMask(pin); + uint8_t port = digitalPinToPort(pin); + + volatile uint8_t *dir; + volatile uint8_t *ren; + volatile uint8_t *out; + volatile uint8_t *sel; + + if (port == NOT_A_PORT) return; + + dir = portDirRegister(port); + ren = portRenRegister(port); + out = portOutputRegister(port); + + if (mode & OUTPUT) { + *dir |= bit; + } else { + *dir &= ~bit; + if (mode & INPUT_PULLUP) { + *out |= bit; + *ren |= bit; + } else if (mode & INPUT_PULLDOWN) { + *out &= ~bit; + *ren |= bit; + } + } + + #if (defined(P1SEL_) || defined(P1SEL)) + sel = portSel0Register(port); /* get the port function select register address */ + if (mode & PORT_SELECTION0) { + *sel |= bit; + } else { + *sel &= ~bit; + } + #if (defined(P1SEL2_) || defined(P1SEL2)) + sel = portSel2Register(port); /* get the port function select register address */ + if (mode & PORT_SELECTION1) { + *sel |= bit; + } else { + *sel &= ~bit; + } + #endif + #endif + + #if (defined(P1SEL0_) || defined(P1SEL0)) + sel = portSel0Register(port); /* get the port function select register address */ + if (mode & PORT_SELECTION0) { + *sel |= bit; + } else { + *sel &= ~bit; + } + #if (defined(P1SEL1_) || defined(P1SEL1)) + sel = portSel1Register(port); /* get the port function select register address */ + if (mode & PORT_SELECTION1) { + *sel |= bit; + } else { + *sel &= ~bit; + } + #endif + #endif + +} + +int digitalRead(uint8_t pin) +{ + uint8_t bit = digitalPinToBitMask(pin); + uint8_t port = digitalPinToPort(pin); + + if (port == NOT_A_PORT) return LOW; + + if (*portInputRegister(port) & bit) return HIGH; + return LOW; +} + +void digitalWrite(uint8_t pin, uint8_t val) +{ + uint8_t bit = digitalPinToBitMask(pin); + uint8_t port = digitalPinToPort(pin); + volatile uint8_t *out; + volatile uint8_t *sel; + + if (port == NOT_A_PORT) return; + + /* + * Clear bit in PxSEL register to select GPIO function. Other functions like analogWrite(...) + * will set this bit so need to clear it. + */ + #if (defined(P1SEL_) || defined(P1SEL)) + sel = portSel0Register(port); /* get the port function select register address */ + *sel &= ~bit; /* clear bit in pin function select register */ + #if (defined(P1SEL2_) || defined(P1SEL2)) + sel = portSel2Register(port); /* get the port function select register address */ + *sel &= ~bit; /* clear bit in pin function select register */ + #endif + #endif + + #if (defined(P1SEL0_) || defined(P1SEL0)) + sel = portSel0Register(port); /* get the port function select register address */ + *sel &= ~bit; /* clear bit in pin function select register */ + #if (defined(P1SEL1_) || defined(P1SEL1)) + sel = portSel1Register(port); /* get the port function select register address */ + *sel &= ~bit; /* clear bit in pin function select register */ + #endif + #endif + + + out = portOutputRegister(port); + + if (val == LOW) { + *out &= ~bit; + } else { + *out |= bit; + } +} |