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MODDMA/MODDMA.cpp@0:08a4d61cd84c, 2011-09-20 (annotated)

Committer:
mark2r2
Date:
Tue Sep 20 12:46:26 2011 +0000
Revision:
0:08a4d61cd84c
V1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mark2r2 0:08a4d61cd84c 1 /*
mark2r2 0:08a4d61cd84c 2 Copyright (c) 2010 Andy Kirkham
mark2r2 0:08a4d61cd84c 3
mark2r2 0:08a4d61cd84c 4 Permission is hereby granted, free of charge, to any person obtaining a copy
mark2r2 0:08a4d61cd84c 5 of this software and associated documentation files (the "Software"), to deal
mark2r2 0:08a4d61cd84c 6 in the Software without restriction, including without limitation the rights
mark2r2 0:08a4d61cd84c 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mark2r2 0:08a4d61cd84c 8 copies of the Software, and to permit persons to whom the Software is
mark2r2 0:08a4d61cd84c 9 furnished to do so, subject to the following conditions:
mark2r2 0:08a4d61cd84c 10
mark2r2 0:08a4d61cd84c 11 The above copyright notice and this permission notice shall be included in
mark2r2 0:08a4d61cd84c 12 all copies or substantial portions of the Software.
mark2r2 0:08a4d61cd84c 13
mark2r2 0:08a4d61cd84c 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mark2r2 0:08a4d61cd84c 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mark2r2 0:08a4d61cd84c 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mark2r2 0:08a4d61cd84c 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mark2r2 0:08a4d61cd84c 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mark2r2 0:08a4d61cd84c 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
mark2r2 0:08a4d61cd84c 20 THE SOFTWARE.
mark2r2 0:08a4d61cd84c 21 */
mark2r2 0:08a4d61cd84c 22 #include "iomacros.h"
mark2r2 0:08a4d61cd84c 23 #include "MODDMA.h"
mark2r2 0:08a4d61cd84c 24
mark2r2 0:08a4d61cd84c 25 namespace AjK {
mark2r2 0:08a4d61cd84c 26
mark2r2 0:08a4d61cd84c 27 // Create a "hook" for our ISR to make callbacks. Set by init()
mark2r2 0:08a4d61cd84c 28 class MODDMA *moddma_p = (class MODDMA *)NULL;
mark2r2 0:08a4d61cd84c 29
mark2r2 0:08a4d61cd84c 30 void
mark2r2 0:08a4d61cd84c 31 MODDMA::Enable(CHANNELS ChannelNumber)
mark2r2 0:08a4d61cd84c 32 {
mark2r2 0:08a4d61cd84c 33 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
mark2r2 0:08a4d61cd84c 34 pChannel->DMACCConfig |= _E;
mark2r2 0:08a4d61cd84c 35 }
mark2r2 0:08a4d61cd84c 36
mark2r2 0:08a4d61cd84c 37 bool
mark2r2 0:08a4d61cd84c 38 MODDMA::Enabled(CHANNELS ChannelNumber)
mark2r2 0:08a4d61cd84c 39 {
mark2r2 0:08a4d61cd84c 40 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
mark2r2 0:08a4d61cd84c 41 return (bool)(pChannel->DMACCConfig & _E);
mark2r2 0:08a4d61cd84c 42 }
mark2r2 0:08a4d61cd84c 43
mark2r2 0:08a4d61cd84c 44 void
mark2r2 0:08a4d61cd84c 45 MODDMA::Disable(CHANNELS ChannelNumber)
mark2r2 0:08a4d61cd84c 46 {
mark2r2 0:08a4d61cd84c 47 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
mark2r2 0:08a4d61cd84c 48 pChannel->DMACCConfig &= ~(_E);
mark2r2 0:08a4d61cd84c 49 }
mark2r2 0:08a4d61cd84c 50
mark2r2 0:08a4d61cd84c 51 bool
mark2r2 0:08a4d61cd84c 52 MODDMA::isActive(CHANNELS ChannelNumber)
mark2r2 0:08a4d61cd84c 53 {
mark2r2 0:08a4d61cd84c 54 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
mark2r2 0:08a4d61cd84c 55 return (bool)( pChannel->DMACCConfig & CxConfig_A() ) ;
mark2r2 0:08a4d61cd84c 56 }
mark2r2 0:08a4d61cd84c 57
mark2r2 0:08a4d61cd84c 58 void
mark2r2 0:08a4d61cd84c 59 MODDMA::haltChannel(CHANNELS ChannelNumber)
mark2r2 0:08a4d61cd84c 60 {
mark2r2 0:08a4d61cd84c 61 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
mark2r2 0:08a4d61cd84c 62 pChannel->DMACCConfig |= CxConfig_H();
mark2r2 0:08a4d61cd84c 63 }
mark2r2 0:08a4d61cd84c 64
mark2r2 0:08a4d61cd84c 65 uint32_t
mark2r2 0:08a4d61cd84c 66 MODDMA::getControl(CHANNELS ChannelNumber)
mark2r2 0:08a4d61cd84c 67 {
mark2r2 0:08a4d61cd84c 68 LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber );
mark2r2 0:08a4d61cd84c 69 return pChannel->DMACCControl;
mark2r2 0:08a4d61cd84c 70 }
mark2r2 0:08a4d61cd84c 71
mark2r2 0:08a4d61cd84c 72 uint32_t oldDMAHandler = 0;
mark2r2 0:08a4d61cd84c 73 typedef void (*MODDMA_FN)(void);
mark2r2 0:08a4d61cd84c 74
mark2r2 0:08a4d61cd84c 75 extern "C" void MODDMA_IRQHandler(void) {
mark2r2 0:08a4d61cd84c 76 uint32_t channel_mask;
mark2r2 0:08a4d61cd84c 77
mark2r2 0:08a4d61cd84c 78 if (moddma_p == (class MODDMA *)NULL) {
mark2r2 0:08a4d61cd84c 79 if (oldDMAHandler) {
mark2r2 0:08a4d61cd84c 80 ((MODDMA_FN)oldDMAHandler)();
mark2r2 0:08a4d61cd84c 81 return;
mark2r2 0:08a4d61cd84c 82 }
mark2r2 0:08a4d61cd84c 83 else {
mark2r2 0:08a4d61cd84c 84 error("Interrupt without instance");
mark2r2 0:08a4d61cd84c 85 }
mark2r2 0:08a4d61cd84c 86 }
mark2r2 0:08a4d61cd84c 87
mark2r2 0:08a4d61cd84c 88 for (int channel_number = 0; channel_number < 8; channel_number++) {
mark2r2 0:08a4d61cd84c 89 channel_mask = (1UL << channel_number);
mark2r2 0:08a4d61cd84c 90 if (LPC_GPDMA->DMACIntStat & channel_mask) {
mark2r2 0:08a4d61cd84c 91 if (LPC_GPDMA->DMACIntTCStat & channel_mask) {
mark2r2 0:08a4d61cd84c 92 if (moddma_p->setups[channel_number] != (MODDMA_Config *)NULL) {
mark2r2 0:08a4d61cd84c 93 moddma_p->setIrqProcessingChannel((MODDMA::CHANNELS)channel_number);
mark2r2 0:08a4d61cd84c 94 moddma_p->setIrqType(MODDMA::TcIrq);
mark2r2 0:08a4d61cd84c 95 moddma_p->setups[channel_number]->isrIntTCStat->call();
mark2r2 0:08a4d61cd84c 96 moddma_p->isrIntTCStat.call();
mark2r2 0:08a4d61cd84c 97 // The user callback should clear the IRQ. But if they forget
mark2r2 0:08a4d61cd84c 98 // then the Mbed will lockup. So, check to see if the IRQ has
mark2r2 0:08a4d61cd84c 99 // been dismissed, if not, we will dismiss it here.
mark2r2 0:08a4d61cd84c 100 if (LPC_GPDMA->DMACIntTCStat & channel_mask) {
mark2r2 0:08a4d61cd84c 101 LPC_GPDMA->DMACIntTCClear = channel_mask;
mark2r2 0:08a4d61cd84c 102 }
mark2r2 0:08a4d61cd84c 103 // If the user has left the channel enabled, disable it.
mark2r2 0:08a4d61cd84c 104 // Note, we don't check Active here as it may block inside
mark2r2 0:08a4d61cd84c 105 // an ISR, we just shut it down immediately. If the user
mark2r2 0:08a4d61cd84c 106 // must wait for completion they should implement their
mark2r2 0:08a4d61cd84c 107 // own ISR. But only disable if the LLI linked list register
mark2r2 0:08a4d61cd84c 108 // is null otherwise we can crap out a series of transfers.
mark2r2 0:08a4d61cd84c 109 if (moddma_p->Enabled( (MODDMA::CHANNELS)channel_number )) {
mark2r2 0:08a4d61cd84c 110 if (moddma_p->lli( (MODDMA::CHANNELS)channel_number ) == 0 ) {
mark2r2 0:08a4d61cd84c 111 moddma_p->Disable( (MODDMA::CHANNELS)channel_number );
mark2r2 0:08a4d61cd84c 112 }
mark2r2 0:08a4d61cd84c 113 }
mark2r2 0:08a4d61cd84c 114 }
mark2r2 0:08a4d61cd84c 115 }
mark2r2 0:08a4d61cd84c 116
mark2r2 0:08a4d61cd84c 117 if (LPC_GPDMA->DMACIntErrStat & channel_mask) {
mark2r2 0:08a4d61cd84c 118 if (moddma_p->setups[channel_number] != (MODDMA_Config *)NULL) {
mark2r2 0:08a4d61cd84c 119 moddma_p->setIrqProcessingChannel((MODDMA::CHANNELS)channel_number);
mark2r2 0:08a4d61cd84c 120 moddma_p->setIrqType(MODDMA::ErrIrq);
mark2r2 0:08a4d61cd84c 121 moddma_p->setups[channel_number]->isrIntErrStat->call();
mark2r2 0:08a4d61cd84c 122 moddma_p->isrIntErrStat.call();
mark2r2 0:08a4d61cd84c 123 // The user callback should clear the IRQ. But if they forget
mark2r2 0:08a4d61cd84c 124 // then the Mbed will lockup. So, check to see if the IRQ has
mark2r2 0:08a4d61cd84c 125 // been dismissed, if not, we will dismiss it here.
mark2r2 0:08a4d61cd84c 126 if (LPC_GPDMA->DMACIntErrStat & channel_mask) {
mark2r2 0:08a4d61cd84c 127 LPC_GPDMA->DMACIntErrClr = channel_mask;
mark2r2 0:08a4d61cd84c 128 }
mark2r2 0:08a4d61cd84c 129 // If the user has left the channel enabled, disable it.
mark2r2 0:08a4d61cd84c 130 // Not, we don't check Active here as it may block inside
mark2r2 0:08a4d61cd84c 131 // an ISR, we just shut it down immediately. If the user
mark2r2 0:08a4d61cd84c 132 // must wait for completion they should implement their
mark2r2 0:08a4d61cd84c 133 // own ISR. But only disable if the LLI linked list register
mark2r2 0:08a4d61cd84c 134 // is null otherwise we can crap out a series of transfers.
mark2r2 0:08a4d61cd84c 135 if (moddma_p->Enabled( (MODDMA::CHANNELS)channel_number )) {
mark2r2 0:08a4d61cd84c 136 if (moddma_p->lli( (MODDMA::CHANNELS)channel_number ) == 0 ) {
mark2r2 0:08a4d61cd84c 137 moddma_p->Disable( (MODDMA::CHANNELS)channel_number );
mark2r2 0:08a4d61cd84c 138 }
mark2r2 0:08a4d61cd84c 139 }
mark2r2 0:08a4d61cd84c 140 }
mark2r2 0:08a4d61cd84c 141 }
mark2r2 0:08a4d61cd84c 142 }
mark2r2 0:08a4d61cd84c 143 }
mark2r2 0:08a4d61cd84c 144
mark2r2 0:08a4d61cd84c 145 /* IRQ should be handled by now, check to make sure. */
mark2r2 0:08a4d61cd84c 146 if (LPC_GPDMA->DMACIntStat) {
mark2r2 0:08a4d61cd84c 147 ((MODDMA_FN)oldDMAHandler)();
mark2r2 0:08a4d61cd84c 148 LPC_GPDMA->DMACIntTCClear = (uint32_t)0xFF; /* If not, clear anyway! */
mark2r2 0:08a4d61cd84c 149 }
mark2r2 0:08a4d61cd84c 150 if (LPC_GPDMA->DMACIntErrStat) {
mark2r2 0:08a4d61cd84c 151 ((MODDMA_FN)oldDMAHandler)();
mark2r2 0:08a4d61cd84c 152 LPC_GPDMA->DMACIntErrClr = (uint32_t)0xFF; /* If not, clear anyway! */
mark2r2 0:08a4d61cd84c 153 }
mark2r2 0:08a4d61cd84c 154 }
mark2r2 0:08a4d61cd84c 155
mark2r2 0:08a4d61cd84c 156 }; // namespace AjK ends
mark2r2 0:08a4d61cd84c 157