mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
Diff: cpp/CAN.cpp
- Revision:
- 0:fd0d7bdfcdc2
- Child:
- 2:143cac498751
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/cpp/CAN.cpp Tue Nov 20 17:24:08 2012 +0000 @@ -0,0 +1,125 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2012 ARM Limited + * + * 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. + */ +#include "CAN.h" + +#if DEVICE_CAN + +#include "cmsis.h" + +namespace mbed { + +CAN::CAN(PinName rd, PinName td) { + can_init(&_can, rd, td); +} + +CAN::~CAN() { + can_free(&_can); +} + +int CAN::frequency(int f) { + return can_frequency(&_can, f); +} + +int CAN::write(CANMessage msg) { + return can_write(&_can, msg, 0); +} + +int CAN::read(CANMessage &msg) { + return can_read(&_can, &msg); +} + +void CAN::reset() { + can_reset(&_can); +} + +unsigned char CAN::rderror() { + return can_rderror(&_can); +} + +unsigned char CAN::tderror() { + return can_tderror(&_can); +} + +void CAN::monitor(bool silent) { + can_monitor(&_can, (silent) ? 1 : 0); +} + +static FunctionPointer* can_obj[2] = { NULL }; + +// Have to check that the CAN block is active before reading the Interrupt +// Control Register, or the mbed hangs +void can_irq(void) { + uint32_t icr; + + if(LPC_SC->PCONP & (1 << 13)) { + icr = LPC_CAN1->ICR; + + if(icr && (can_obj[0] != NULL)) { + can_obj[0]->call(); + } + } + + if(LPC_SC->PCONP & (1 << 14)) { + icr = LPC_CAN2->ICR; + if(icr && (can_obj[1] != NULL)) { + can_obj[1]->call(); + } + } + +} + +void CAN::setup_interrupt(void) { + switch ((int)_can.dev) { + case CAN_1: can_obj[0] = &_rxirq; break; + case CAN_2: can_obj[1] = &_rxirq; break; + } + _can.dev->MOD |= 1; + _can.dev->IER |= 1; + _can.dev->MOD &= ~1; + NVIC_SetVector(CAN_IRQn, (uint32_t) &can_irq); + NVIC_EnableIRQ(CAN_IRQn); +} + +void CAN::remove_interrupt(void) { + switch ((int)_can.dev) { + case CAN_1: can_obj[0] = NULL; break; + case CAN_2: can_obj[1] = NULL; break; + } + + _can.dev->IER &= ~(1); + if ((can_obj[0] == NULL) && (can_obj[1] == NULL)) { + NVIC_DisableIRQ(CAN_IRQn); + } +} + +void CAN::attach(void (*fptr)(void)) { + if (fptr != NULL) { + _rxirq.attach(fptr); + setup_interrupt(); + } else { + remove_interrupt(); + } +} + +} // namespace mbed + +#endif