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author | Perry Hung <iperry@alum.mit.edu> | 2010-04-25 18:14:43 -0400 |
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committer | Perry Hung <iperry@alum.mit.edu> | 2010-04-25 18:14:43 -0400 |
commit | 4ccbeb08e64b6bc7cee1f54a04001eff778b4282 (patch) | |
tree | 05f71e01c98ac341c029b2a050b796f1be3de8b5 /wirish/ext_interrupts.c | |
parent | b41eb846ca60559cff242d0c550699eb8f309909 (diff) | |
parent | 62552a6f3f93223682f9df2df2614411f7e3d54c (diff) | |
download | librambutan-4ccbeb08e64b6bc7cee1f54a04001eff778b4282.tar.gz librambutan-4ccbeb08e64b6bc7cee1f54a04001eff778b4282.zip |
Merge branch 'master' into spi
Diffstat (limited to 'wirish/ext_interrupts.c')
-rw-r--r-- | wirish/ext_interrupts.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/wirish/ext_interrupts.c b/wirish/ext_interrupts.c new file mode 100644 index 0000000..54b8be9 --- /dev/null +++ b/wirish/ext_interrupts.c @@ -0,0 +1,109 @@ +/* ***************************************************************************** + * The MIT License + * + * Copyright (c) 2010 Perry Hung. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * ****************************************************************************/ + +/** + * @file ext_interrupts.c + * + * @brief Wiring-like interface for external interrupts + */ + +#include "wirish.h" +#include "exti.h" +#include "ext_interrupts.h" + +typedef struct ExtiInfo { + uint8 channel; + uint8 port; +} ExtiInfo; + +static ExtiInfo PIN_TO_EXTI_CHANNEL[NR_MAPLE_PINS] = { + {EXTI3, EXTI_CONFIG_PORTA}, // D0/PA3 + {EXTI2, EXTI_CONFIG_PORTA}, // D1/PA2 + {EXTI0, EXTI_CONFIG_PORTA}, // D2/PA0 + {EXTI1, EXTI_CONFIG_PORTA}, // D3/PA1 + {EXTI5, EXTI_CONFIG_PORTB}, // D4/PB5 + {EXTI6, EXTI_CONFIG_PORTB}, // D5/PB6 + {EXTI8, EXTI_CONFIG_PORTA}, // D6/PA8 + {EXTI9, EXTI_CONFIG_PORTA}, // D7/PA9 + {EXTI10, EXTI_CONFIG_PORTA}, // D8/PA10 + {EXTI7, EXTI_CONFIG_PORTB}, // D9/PB7 + {EXTI4, EXTI_CONFIG_PORTA}, // D10/PA4 + {EXTI7, EXTI_CONFIG_PORTA}, // D11/PA7 + {EXTI6, EXTI_CONFIG_PORTA}, // D12/PA6 + {EXTI5, EXTI_CONFIG_PORTA}, // D13/PA5 +}; + + +/** + * @brief Attach an interrupt handler to be triggered on a given + * transition on the pin. Runs in interrupt context + * + * @param[in] pin Maple pin number + * @param[in] handler Function to run upon external interrupt trigger. + * @param[in] mode Type of transition to trigger on, eg falling, rising, etc. + * + * @sideeffect Registers a handler + */ +int attachInterrupt(uint8 pin, voidFuncPtr handler, ExtInterruptTriggerMode mode) { + uint8 outMode; + /* Parameter checking */ + if (pin >= NR_MAPLE_PINS) { + return EXT_INTERRUPT_INVALID_PIN; + } + + if (!handler) { + ASSERT(0); + return EXT_INTERRUPT_INVALID_FUNCTION; + } + + switch (mode) { + case RISING: + outMode = EXTI_RISING; + break; + case FALLING: + outMode = EXTI_FALLING; + break; + case CHANGE: + outMode = EXTI_RISING_FALLING; + break; + default: + ASSERT(0); + return EXT_INTERRUPT_INVALID_MODE;; + } + + exti_attach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel, + PIN_TO_EXTI_CHANNEL[pin].port, + handler, mode); + + return 0; +} + +int detachInterrupt(uint8 pin) { + if (!(pin < NR_MAPLE_PINS)) { + return EXT_INTERRUPT_INVALID_PIN; + } + + exti_detach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel); +} + |