Andy K / MODDMA

MODDMA GPDMA Controller New features: transfer pins to memory buffer under periodic timer control and send double buffers to DAC

Dependents:   FirstTest WaveSim IO-dma-memmem DACDMAfuncgenlib ... more

MODDMA.cpp@0:c409efd8df78, 2010-11-23 (annotated)

Committer:
AjK
Date:
Tue Nov 23 14:50:39 2010 +0000
Revision:
0:c409efd8df78
Child:
6:40d38be4bb59
0.1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AjK 0:c409efd8df78 1 /*
AjK 0:c409efd8df78 2 Copyright (c) 2010 Andy Kirkham
AjK 0:c409efd8df78 3
AjK 0:c409efd8df78 4 Permission is hereby granted, free of charge, to any person obtaining a copy
AjK 0:c409efd8df78 5 of this software and associated documentation files (the "Software"), to deal
AjK 0:c409efd8df78 6 in the Software without restriction, including without limitation the rights
AjK 0:c409efd8df78 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
AjK 0:c409efd8df78 8 copies of the Software, and to permit persons to whom the Software is
AjK 0:c409efd8df78 9 furnished to do so, subject to the following conditions:
AjK 0:c409efd8df78 10
AjK 0:c409efd8df78 11 The above copyright notice and this permission notice shall be included in
AjK 0:c409efd8df78 12 all copies or substantial portions of the Software.
AjK 0:c409efd8df78 13
AjK 0:c409efd8df78 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
AjK 0:c409efd8df78 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
AjK 0:c409efd8df78 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AjK 0:c409efd8df78 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
AjK 0:c409efd8df78 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
AjK 0:c409efd8df78 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
AjK 0:c409efd8df78 20 THE SOFTWARE.
AjK 0:c409efd8df78 21 */
AjK 0:c409efd8df78 22
AjK 0:c409efd8df78 23 #include "MODDMA.h"
AjK 0:c409efd8df78 24
AjK 0:c409efd8df78 25 namespace AjK {
AjK 0:c409efd8df78 26
AjK 0:c409efd8df78 27 // Create a "hook" for our ISR to make callbacks. Set by init()
AjK 0:c409efd8df78 28 class MODDMA *moddma_p = (class MODDMA *)NULL;
AjK 0:c409efd8df78 29
AjK 0:c409efd8df78 30 void
AjK 0:c409efd8df78 31 MODDMA::Enable(CHANNELS ChannelNumber)
AjK 0:c409efd8df78 32 {
AjK 0:c409efd8df78 33 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
AjK 0:c409efd8df78 34 pChannel->DMACCConfig |= _E;
AjK 0:c409efd8df78 35 }
AjK 0:c409efd8df78 36
AjK 0:c409efd8df78 37 bool
AjK 0:c409efd8df78 38 MODDMA::Enabled(CHANNELS ChannelNumber)
AjK 0:c409efd8df78 39 {
AjK 0:c409efd8df78 40 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
AjK 0:c409efd8df78 41 return (bool)(pChannel->DMACCConfig & _E);
AjK 0:c409efd8df78 42 }
AjK 0:c409efd8df78 43
AjK 0:c409efd8df78 44 void
AjK 0:c409efd8df78 45 MODDMA::Disable(CHANNELS ChannelNumber)
AjK 0:c409efd8df78 46 {
AjK 0:c409efd8df78 47 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
AjK 0:c409efd8df78 48 pChannel->DMACCConfig &= ~(_E);
AjK 0:c409efd8df78 49 }
AjK 0:c409efd8df78 50
AjK 0:c409efd8df78 51 bool
AjK 0:c409efd8df78 52 MODDMA::isActive(CHANNELS ChannelNumber)
AjK 0:c409efd8df78 53 {
AjK 0:c409efd8df78 54 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
AjK 0:c409efd8df78 55 return (bool)( pChannel->DMACCConfig & CxConfig_A() ) ;
AjK 0:c409efd8df78 56 }
AjK 0:c409efd8df78 57
AjK 0:c409efd8df78 58 void
AjK 0:c409efd8df78 59 MODDMA::haltChannel(CHANNELS ChannelNumber)
AjK 0:c409efd8df78 60 {
AjK 0:c409efd8df78 61 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
AjK 0:c409efd8df78 62 pChannel->DMACCConfig |= CxConfig_H();
AjK 0:c409efd8df78 63 }
AjK 0:c409efd8df78 64
AjK 0:c409efd8df78 65 uint32_t oldDMAHandler = 0;
AjK 0:c409efd8df78 66 typedef void (*MODDMA_FN)(void);
AjK 0:c409efd8df78 67
AjK 0:c409efd8df78 68 extern "C" void MODDMA_IRQHandler(void) {
AjK 0:c409efd8df78 69 uint32_t channel_mask;
AjK 0:c409efd8df78 70
AjK 0:c409efd8df78 71 if (moddma_p == (class MODDMA *)NULL) {
AjK 0:c409efd8df78 72 if (oldDMAHandler) {
AjK 0:c409efd8df78 73 ((MODDMA_FN)oldDMAHandler)();
AjK 0:c409efd8df78 74 return;
AjK 0:c409efd8df78 75 }
AjK 0:c409efd8df78 76 else {
AjK 0:c409efd8df78 77 error("Interrupt without instance");
AjK 0:c409efd8df78 78 }
AjK 0:c409efd8df78 79 }
AjK 0:c409efd8df78 80
AjK 0:c409efd8df78 81 for (int channel_number = 0; channel_number < 8; channel_number++) {
AjK 0:c409efd8df78 82 channel_mask = (1UL << channel_number);
AjK 0:c409efd8df78 83 if (LPC_GPDMA->DMACIntStat & channel_mask) {
AjK 0:c409efd8df78 84 if (LPC_GPDMA->DMACIntTCStat & channel_mask) {
AjK 0:c409efd8df78 85 if (moddma_p->setups[channel_number] != (MODDMA_Config *)NULL) {
AjK 0:c409efd8df78 86 moddma_p->setIrqProcessingChannel((MODDMA::CHANNELS)channel_number);
AjK 0:c409efd8df78 87 moddma_p->setIrqType(MODDMA::TcIrq);
AjK 0:c409efd8df78 88 moddma_p->setups[channel_number]->isrIntTCStat->call();
AjK 0:c409efd8df78 89 moddma_p->isrIntTCStat.call();
AjK 0:c409efd8df78 90 // The user callback should clear the IRQ. But if they forget
AjK 0:c409efd8df78 91 // then the Mbed will lockup. So, check to see if the IRQ has
AjK 0:c409efd8df78 92 // been dismissed, if not, we will dismiss it here.
AjK 0:c409efd8df78 93 if (LPC_GPDMA->DMACIntTCStat & channel_mask) {
AjK 0:c409efd8df78 94 LPC_GPDMA->DMACIntTCClear = channel_mask;
AjK 0:c409efd8df78 95 }
AjK 0:c409efd8df78 96 // If the user has left the channel enabled, disable it.
AjK 0:c409efd8df78 97 // Not, we don't check Active here as it may block inside
AjK 0:c409efd8df78 98 // an ISR, we just shut it down immediately. If the user
AjK 0:c409efd8df78 99 // must wait for completion they should implement their
AjK 0:c409efd8df78 100 // own ISR.
AjK 0:c409efd8df78 101 if (moddma_p->Enabled( (MODDMA::CHANNELS)channel_number )) {
AjK 0:c409efd8df78 102 moddma_p->Disable( (MODDMA::CHANNELS)channel_number );
AjK 0:c409efd8df78 103 }
AjK 0:c409efd8df78 104 }
AjK 0:c409efd8df78 105 }
AjK 0:c409efd8df78 106
AjK 0:c409efd8df78 107 if (LPC_GPDMA->DMACIntErrStat & channel_mask) {
AjK 0:c409efd8df78 108 if (moddma_p->setups[channel_number] != (MODDMA_Config *)NULL) {
AjK 0:c409efd8df78 109 moddma_p->setIrqProcessingChannel((MODDMA::CHANNELS)channel_number);
AjK 0:c409efd8df78 110 moddma_p->setIrqType(MODDMA::ErrIrq);
AjK 0:c409efd8df78 111 moddma_p->setups[channel_number]->isrIntErrStat->call();
AjK 0:c409efd8df78 112 moddma_p->isrIntErrStat.call();
AjK 0:c409efd8df78 113 // The user callback should clear the IRQ. But if they forget
AjK 0:c409efd8df78 114 // then the Mbed will lockup. So, check to see if the IRQ has
AjK 0:c409efd8df78 115 // been dismissed, if not, we will dismiss it here.
AjK 0:c409efd8df78 116 if (LPC_GPDMA->DMACIntErrStat & channel_mask) {
AjK 0:c409efd8df78 117 LPC_GPDMA->DMACIntErrClr = channel_mask;
AjK 0:c409efd8df78 118 }
AjK 0:c409efd8df78 119 // If the user has left the channel enabled, disable it.
AjK 0:c409efd8df78 120 // Not, we don't check Active here as it may block inside
AjK 0:c409efd8df78 121 // an ISR, we just shut it down immediately. If the user
AjK 0:c409efd8df78 122 // must wait for completion they should implement their
AjK 0:c409efd8df78 123 // own ISR.
AjK 0:c409efd8df78 124 if (moddma_p->Enabled( (MODDMA::CHANNELS)channel_number )) {
AjK 0:c409efd8df78 125 moddma_p->Disable( (MODDMA::CHANNELS)channel_number );
AjK 0:c409efd8df78 126 }
AjK 0:c409efd8df78 127 }
AjK 0:c409efd8df78 128 }
AjK 0:c409efd8df78 129 }
AjK 0:c409efd8df78 130 }
AjK 0:c409efd8df78 131
AjK 0:c409efd8df78 132 /* IRQ should be handled by now, check to make sure. */
AjK 0:c409efd8df78 133 if (LPC_GPDMA->DMACIntStat) {
AjK 0:c409efd8df78 134 ((MODDMA_FN)oldDMAHandler)();
AjK 0:c409efd8df78 135 LPC_GPDMA->DMACIntTCClear = (uint32_t)0xFF; /* If not, clear anyway! */
AjK 0:c409efd8df78 136 }
AjK 0:c409efd8df78 137 if (LPC_GPDMA->DMACIntErrStat) {
AjK 0:c409efd8df78 138 ((MODDMA_FN)oldDMAHandler)();
AjK 0:c409efd8df78 139 LPC_GPDMA->DMACIntErrClr = (uint32_t)0xFF; /* If not, clear anyway! */
AjK 0:c409efd8df78 140 }
AjK 0:c409efd8df78 141 }
AjK 0:c409efd8df78 142
AjK 0:c409efd8df78 143 }; // namespace AjK ends
AjK 0:c409efd8df78 144