Dependencies: mbed NetServicesMin
Diff: MODDMA/INIT.cpp
- Revision:
- 0:aa9ebbd3715f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MODDMA/INIT.cpp Mon Jun 18 03:59:39 2012 +0000 @@ -0,0 +1,69 @@ +/* + Copyright (c) 2010 Andy Kirkham + + 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 "MODDMA.h" + +namespace AjK { + +extern uint32_t oldDMAHandler; +extern "C" void MODDMA_IRQHandler(void); +extern class MODDMA *moddma_p; + +void +MODDMA::init(bool isConstructorCalling, int Channels, int Tc, int Err) +{ + if (isConstructorCalling) { + if (LPC_SC->PCONP & (1UL << 29)) { + if (LPC_GPDMA->DMACConfig & 1) { + error("Only one instance of MODDMA can exist."); + } + } + LPC_SC->PCONP |= (1UL << 29); + LPC_GPDMA->DMACConfig = 1; + moddma_p = this; + for (int i = 0; i < 8; i++) { + setups[i] = (MODDMA_Config *)NULL; + } + } + + // Reset channel configuration register(s) + if (Channels & 0x01) LPC_GPDMACH0->DMACCConfig = 0; + if (Channels & 0x02) LPC_GPDMACH1->DMACCConfig = 0; + if (Channels & 0x04) LPC_GPDMACH2->DMACCConfig = 0; + if (Channels & 0x08) LPC_GPDMACH3->DMACCConfig = 0; + if (Channels & 0x10) LPC_GPDMACH4->DMACCConfig = 0; + if (Channels & 0x20) LPC_GPDMACH5->DMACCConfig = 0; + if (Channels & 0x40) LPC_GPDMACH6->DMACCConfig = 0; + if (Channels & 0x80) LPC_GPDMACH7->DMACCConfig = 0; + + /* Clear DMA interrupt and error flag */ + LPC_GPDMA->DMACIntTCClear = Tc; + LPC_GPDMA->DMACIntErrClr = Err; + + if (isConstructorCalling) { + oldDMAHandler = NVIC_GetVector(DMA_IRQn); + NVIC_SetVector(DMA_IRQn, (uint32_t)MODDMA_IRQHandler); + NVIC_EnableIRQ(DMA_IRQn); + } +} + +}; // namespace AjK ends