ok
Dependents: Bootcamp-dma-serial
Fork of MODDMA by
MODDMA.cpp@12:1dfee7208043, 2011-03-13 (annotated)
- Committer:
- AjK
- Date:
- Sun Mar 13 23:28:21 2011 +0000
- Revision:
- 12:1dfee7208043
- Parent:
- 8:cb4d323ce6fd
1.8 See ChangeLog.c
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
AjK | 8:cb4d323ce6fd | 1 | /* |
AjK | 8:cb4d323ce6fd | 2 | Copyright (c) 2010 Andy Kirkham |
AjK | 8:cb4d323ce6fd | 3 | |
AjK | 8:cb4d323ce6fd | 4 | Permission is hereby granted, free of charge, to any person obtaining a copy |
AjK | 8:cb4d323ce6fd | 5 | of this software and associated documentation files (the "Software"), to deal |
AjK | 8:cb4d323ce6fd | 6 | in the Software without restriction, including without limitation the rights |
AjK | 8:cb4d323ce6fd | 7 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
AjK | 8:cb4d323ce6fd | 8 | copies of the Software, and to permit persons to whom the Software is |
AjK | 8:cb4d323ce6fd | 9 | furnished to do so, subject to the following conditions: |
AjK | 8:cb4d323ce6fd | 10 | |
AjK | 8:cb4d323ce6fd | 11 | The above copyright notice and this permission notice shall be included in |
AjK | 8:cb4d323ce6fd | 12 | all copies or substantial portions of the Software. |
AjK | 8:cb4d323ce6fd | 13 | |
AjK | 8:cb4d323ce6fd | 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
AjK | 8:cb4d323ce6fd | 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
AjK | 8:cb4d323ce6fd | 16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
AjK | 8:cb4d323ce6fd | 17 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
AjK | 8:cb4d323ce6fd | 18 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
AjK | 8:cb4d323ce6fd | 19 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
AjK | 8:cb4d323ce6fd | 20 | THE SOFTWARE. |
AjK | 8:cb4d323ce6fd | 21 | */ |
AjK | 8:cb4d323ce6fd | 22 | #include "iomacros.h" |
AjK | 8:cb4d323ce6fd | 23 | #include "MODDMA.h" |
AjK | 8:cb4d323ce6fd | 24 | |
AjK | 8:cb4d323ce6fd | 25 | namespace AjK { |
AjK | 8:cb4d323ce6fd | 26 | |
AjK | 8:cb4d323ce6fd | 27 | // Create a "hook" for our ISR to make callbacks. Set by init() |
AjK | 8:cb4d323ce6fd | 28 | class MODDMA *moddma_p = (class MODDMA *)NULL; |
AjK | 8:cb4d323ce6fd | 29 | |
AjK | 8:cb4d323ce6fd | 30 | void |
AjK | 8:cb4d323ce6fd | 31 | MODDMA::Enable(CHANNELS ChannelNumber) |
AjK | 8:cb4d323ce6fd | 32 | { |
AjK | 8:cb4d323ce6fd | 33 | LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber ); |
AjK | 8:cb4d323ce6fd | 34 | pChannel->DMACCConfig |= _E; |
AjK | 8:cb4d323ce6fd | 35 | } |
AjK | 8:cb4d323ce6fd | 36 | |
AjK | 8:cb4d323ce6fd | 37 | bool |
AjK | 8:cb4d323ce6fd | 38 | MODDMA::Enabled(CHANNELS ChannelNumber) |
AjK | 8:cb4d323ce6fd | 39 | { |
AjK | 12:1dfee7208043 | 40 | LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber ); |
AjK | 8:cb4d323ce6fd | 41 | return (bool)(pChannel->DMACCConfig & _E); |
AjK | 8:cb4d323ce6fd | 42 | } |
AjK | 8:cb4d323ce6fd | 43 | |
AjK | 8:cb4d323ce6fd | 44 | void |
AjK | 8:cb4d323ce6fd | 45 | MODDMA::Disable(CHANNELS ChannelNumber) |
AjK | 8:cb4d323ce6fd | 46 | { |
AjK | 8:cb4d323ce6fd | 47 | LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber ); |
AjK | 8:cb4d323ce6fd | 48 | pChannel->DMACCConfig &= ~(_E); |
AjK | 8:cb4d323ce6fd | 49 | } |
AjK | 8:cb4d323ce6fd | 50 | |
AjK | 8:cb4d323ce6fd | 51 | bool |
AjK | 8:cb4d323ce6fd | 52 | MODDMA::isActive(CHANNELS ChannelNumber) |
AjK | 8:cb4d323ce6fd | 53 | { |
AjK | 8:cb4d323ce6fd | 54 | LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber ); |
AjK | 8:cb4d323ce6fd | 55 | return (bool)( pChannel->DMACCConfig & CxConfig_A() ) ; |
AjK | 8:cb4d323ce6fd | 56 | } |
AjK | 8:cb4d323ce6fd | 57 | |
AjK | 8:cb4d323ce6fd | 58 | void |
AjK | 8:cb4d323ce6fd | 59 | MODDMA::haltChannel(CHANNELS ChannelNumber) |
AjK | 8:cb4d323ce6fd | 60 | { |
AjK | 8:cb4d323ce6fd | 61 | LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber ); |
AjK | 8:cb4d323ce6fd | 62 | pChannel->DMACCConfig |= CxConfig_H(); |
AjK | 8:cb4d323ce6fd | 63 | } |
AjK | 8:cb4d323ce6fd | 64 | |
AjK | 8:cb4d323ce6fd | 65 | uint32_t |
AjK | 8:cb4d323ce6fd | 66 | MODDMA::getControl(CHANNELS ChannelNumber) |
AjK | 8:cb4d323ce6fd | 67 | { |
AjK | 8:cb4d323ce6fd | 68 | LPC_GPDMACH_TypeDef *pChannel = (LPC_GPDMACH_TypeDef *)Channel_p( ChannelNumber ); |
AjK | 8:cb4d323ce6fd | 69 | return pChannel->DMACCControl; |
AjK | 8:cb4d323ce6fd | 70 | } |
AjK | 8:cb4d323ce6fd | 71 | |
AjK | 8:cb4d323ce6fd | 72 | uint32_t oldDMAHandler = 0; |
AjK | 8:cb4d323ce6fd | 73 | typedef void (*MODDMA_FN)(void); |
AjK | 8:cb4d323ce6fd | 74 | |
AjK | 8:cb4d323ce6fd | 75 | extern "C" void MODDMA_IRQHandler(void) { |
AjK | 8:cb4d323ce6fd | 76 | uint32_t channel_mask; |
AjK | 8:cb4d323ce6fd | 77 | |
AjK | 8:cb4d323ce6fd | 78 | if (moddma_p == (class MODDMA *)NULL) { |
AjK | 8:cb4d323ce6fd | 79 | if (oldDMAHandler) { |
AjK | 8:cb4d323ce6fd | 80 | ((MODDMA_FN)oldDMAHandler)(); |
AjK | 8:cb4d323ce6fd | 81 | return; |
AjK | 8:cb4d323ce6fd | 82 | } |
AjK | 8:cb4d323ce6fd | 83 | else { |
AjK | 8:cb4d323ce6fd | 84 | error("Interrupt without instance"); |
AjK | 8:cb4d323ce6fd | 85 | } |
AjK | 8:cb4d323ce6fd | 86 | } |
AjK | 8:cb4d323ce6fd | 87 | |
AjK | 8:cb4d323ce6fd | 88 | for (int channel_number = 0; channel_number < 8; channel_number++) { |
AjK | 8:cb4d323ce6fd | 89 | channel_mask = (1UL << channel_number); |
AjK | 8:cb4d323ce6fd | 90 | if (LPC_GPDMA->DMACIntStat & channel_mask) { |
AjK | 8:cb4d323ce6fd | 91 | if (LPC_GPDMA->DMACIntTCStat & channel_mask) { |
AjK | 8:cb4d323ce6fd | 92 | if (moddma_p->setups[channel_number] != (MODDMA_Config *)NULL) { |
AjK | 8:cb4d323ce6fd | 93 | moddma_p->setIrqProcessingChannel((MODDMA::CHANNELS)channel_number); |
AjK | 8:cb4d323ce6fd | 94 | moddma_p->setIrqType(MODDMA::TcIrq); |
AjK | 8:cb4d323ce6fd | 95 | moddma_p->setups[channel_number]->isrIntTCStat->call(); |
AjK | 8:cb4d323ce6fd | 96 | moddma_p->isrIntTCStat.call(); |
AjK | 8:cb4d323ce6fd | 97 | // The user callback should clear the IRQ. But if they forget |
AjK | 8:cb4d323ce6fd | 98 | // then the Mbed will lockup. So, check to see if the IRQ has |
AjK | 8:cb4d323ce6fd | 99 | // been dismissed, if not, we will dismiss it here. |
AjK | 8:cb4d323ce6fd | 100 | if (LPC_GPDMA->DMACIntTCStat & channel_mask) { |
AjK | 8:cb4d323ce6fd | 101 | LPC_GPDMA->DMACIntTCClear = channel_mask; |
AjK | 8:cb4d323ce6fd | 102 | } |
AjK | 8:cb4d323ce6fd | 103 | // If the user has left the channel enabled, disable it. |
AjK | 8:cb4d323ce6fd | 104 | // Note, we don't check Active here as it may block inside |
AjK | 8:cb4d323ce6fd | 105 | // an ISR, we just shut it down immediately. If the user |
AjK | 8:cb4d323ce6fd | 106 | // must wait for completion they should implement their |
AjK | 8:cb4d323ce6fd | 107 | // own ISR. But only disable if the LLI linked list register |
AjK | 8:cb4d323ce6fd | 108 | // is null otherwise we can crap out a series of transfers. |
AjK | 8:cb4d323ce6fd | 109 | if (moddma_p->Enabled( (MODDMA::CHANNELS)channel_number )) { |
AjK | 8:cb4d323ce6fd | 110 | if (moddma_p->lli( (MODDMA::CHANNELS)channel_number ) == 0 ) { |
AjK | 8:cb4d323ce6fd | 111 | moddma_p->Disable( (MODDMA::CHANNELS)channel_number ); |
AjK | 8:cb4d323ce6fd | 112 | } |
AjK | 8:cb4d323ce6fd | 113 | } |
AjK | 8:cb4d323ce6fd | 114 | } |
AjK | 8:cb4d323ce6fd | 115 | } |
AjK | 8:cb4d323ce6fd | 116 | |
AjK | 8:cb4d323ce6fd | 117 | if (LPC_GPDMA->DMACIntErrStat & channel_mask) { |
AjK | 8:cb4d323ce6fd | 118 | if (moddma_p->setups[channel_number] != (MODDMA_Config *)NULL) { |
AjK | 8:cb4d323ce6fd | 119 | moddma_p->setIrqProcessingChannel((MODDMA::CHANNELS)channel_number); |
AjK | 8:cb4d323ce6fd | 120 | moddma_p->setIrqType(MODDMA::ErrIrq); |
AjK | 8:cb4d323ce6fd | 121 | moddma_p->setups[channel_number]->isrIntErrStat->call(); |
AjK | 8:cb4d323ce6fd | 122 | moddma_p->isrIntErrStat.call(); |
AjK | 8:cb4d323ce6fd | 123 | // The user callback should clear the IRQ. But if they forget |
AjK | 8:cb4d323ce6fd | 124 | // then the Mbed will lockup. So, check to see if the IRQ has |
AjK | 8:cb4d323ce6fd | 125 | // been dismissed, if not, we will dismiss it here. |
AjK | 8:cb4d323ce6fd | 126 | if (LPC_GPDMA->DMACIntErrStat & channel_mask) { |
AjK | 8:cb4d323ce6fd | 127 | LPC_GPDMA->DMACIntErrClr = channel_mask; |
AjK | 8:cb4d323ce6fd | 128 | } |
AjK | 8:cb4d323ce6fd | 129 | // If the user has left the channel enabled, disable it. |
AjK | 8:cb4d323ce6fd | 130 | // Not, we don't check Active here as it may block inside |
AjK | 8:cb4d323ce6fd | 131 | // an ISR, we just shut it down immediately. If the user |
AjK | 8:cb4d323ce6fd | 132 | // must wait for completion they should implement their |
AjK | 8:cb4d323ce6fd | 133 | // own ISR. But only disable if the LLI linked list register |
AjK | 8:cb4d323ce6fd | 134 | // is null otherwise we can crap out a series of transfers. |
AjK | 8:cb4d323ce6fd | 135 | if (moddma_p->Enabled( (MODDMA::CHANNELS)channel_number )) { |
AjK | 8:cb4d323ce6fd | 136 | if (moddma_p->lli( (MODDMA::CHANNELS)channel_number ) == 0 ) { |
AjK | 8:cb4d323ce6fd | 137 | moddma_p->Disable( (MODDMA::CHANNELS)channel_number ); |
AjK | 8:cb4d323ce6fd | 138 | } |
AjK | 8:cb4d323ce6fd | 139 | } |
AjK | 8:cb4d323ce6fd | 140 | } |
AjK | 8:cb4d323ce6fd | 141 | } |
AjK | 8:cb4d323ce6fd | 142 | } |
AjK | 8:cb4d323ce6fd | 143 | } |
AjK | 8:cb4d323ce6fd | 144 | |
AjK | 8:cb4d323ce6fd | 145 | /* IRQ should be handled by now, check to make sure. */ |
AjK | 8:cb4d323ce6fd | 146 | if (LPC_GPDMA->DMACIntStat) { |
AjK | 8:cb4d323ce6fd | 147 | ((MODDMA_FN)oldDMAHandler)(); |
AjK | 8:cb4d323ce6fd | 148 | LPC_GPDMA->DMACIntTCClear = (uint32_t)0xFF; /* If not, clear anyway! */ |
AjK | 8:cb4d323ce6fd | 149 | } |
AjK | 8:cb4d323ce6fd | 150 | if (LPC_GPDMA->DMACIntErrStat) { |
AjK | 8:cb4d323ce6fd | 151 | ((MODDMA_FN)oldDMAHandler)(); |
AjK | 8:cb4d323ce6fd | 152 | LPC_GPDMA->DMACIntErrClr = (uint32_t)0xFF; /* If not, clear anyway! */ |
AjK | 8:cb4d323ce6fd | 153 | } |
AjK | 8:cb4d323ce6fd | 154 | } |
AjK | 8:cb4d323ce6fd | 155 | |
AjK | 8:cb4d323ce6fd | 156 | }; // namespace AjK ends |
AjK | 8:cb4d323ce6fd | 157 |