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Dependents: Bootcamp-dma-serial
Fork of MODDMA by
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?
User | Revision | Line number | New 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 |