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targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/dma_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)
- Committer:
- bogdanm
- Date:
- Thu Oct 01 15:25:22 2015 +0300
- Revision:
- 0:9b334a45a8ff
- Child:
- 50:a417edff4437
Initial commit on mbed-dev
Replaces mbed-src (now inactive)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 0:9b334a45a8ff | 1 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 2 | * @file dma_api.c |
bogdanm | 0:9b334a45a8ff | 3 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 4 | * @section License |
bogdanm | 0:9b334a45a8ff | 5 | * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> |
bogdanm | 0:9b334a45a8ff | 6 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 7 | * |
bogdanm | 0:9b334a45a8ff | 8 | * Permission is granted to anyone to use this software for any purpose, |
bogdanm | 0:9b334a45a8ff | 9 | * including commercial applications, and to alter it and redistribute it |
bogdanm | 0:9b334a45a8ff | 10 | * freely, subject to the following restrictions: |
bogdanm | 0:9b334a45a8ff | 11 | * |
bogdanm | 0:9b334a45a8ff | 12 | * 1. The origin of this software must not be misrepresented; you must not |
bogdanm | 0:9b334a45a8ff | 13 | * claim that you wrote the original software. |
bogdanm | 0:9b334a45a8ff | 14 | * 2. Altered source versions must be plainly marked as such, and must not be |
bogdanm | 0:9b334a45a8ff | 15 | * misrepresented as being the original software. |
bogdanm | 0:9b334a45a8ff | 16 | * 3. This notice may not be removed or altered from any source distribution. |
bogdanm | 0:9b334a45a8ff | 17 | * |
bogdanm | 0:9b334a45a8ff | 18 | * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no |
bogdanm | 0:9b334a45a8ff | 19 | * obligation to support this Software. Silicon Labs is providing the |
bogdanm | 0:9b334a45a8ff | 20 | * Software "AS IS", with no express or implied warranties of any kind, |
bogdanm | 0:9b334a45a8ff | 21 | * including, but not limited to, any implied warranties of merchantability |
bogdanm | 0:9b334a45a8ff | 22 | * or fitness for any particular purpose or warranties against infringement |
bogdanm | 0:9b334a45a8ff | 23 | * of any proprietary rights of a third party. |
bogdanm | 0:9b334a45a8ff | 24 | * |
bogdanm | 0:9b334a45a8ff | 25 | * Silicon Labs will not be liable for any consequential, incidental, or |
bogdanm | 0:9b334a45a8ff | 26 | * special damages, or any other relief, or for any claim by any third party, |
bogdanm | 0:9b334a45a8ff | 27 | * arising from your use of this Software. |
bogdanm | 0:9b334a45a8ff | 28 | * |
bogdanm | 0:9b334a45a8ff | 29 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 30 | |
bogdanm | 0:9b334a45a8ff | 31 | #include <stdint.h> |
bogdanm | 0:9b334a45a8ff | 32 | #include "dma_api_HAL.h" |
bogdanm | 0:9b334a45a8ff | 33 | #include "em_dma.h" |
bogdanm | 0:9b334a45a8ff | 34 | #include "em_cmu.h" |
bogdanm | 0:9b334a45a8ff | 35 | |
bogdanm | 0:9b334a45a8ff | 36 | /** DMA control block array, requires proper alignment. */ |
bogdanm | 0:9b334a45a8ff | 37 | #if defined (__ICCARM__) |
bogdanm | 0:9b334a45a8ff | 38 | #pragma data_alignment=DMACTRL_ALIGNMENT |
bogdanm | 0:9b334a45a8ff | 39 | DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMACTRL_CH_CNT * 2]; |
bogdanm | 0:9b334a45a8ff | 40 | |
bogdanm | 0:9b334a45a8ff | 41 | #elif defined (__CC_ARM) |
bogdanm | 0:9b334a45a8ff | 42 | DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMACTRL_CH_CNT * 2] __attribute__ ((aligned(DMACTRL_ALIGNMENT))); |
bogdanm | 0:9b334a45a8ff | 43 | |
bogdanm | 0:9b334a45a8ff | 44 | #elif defined (__GNUC__) |
bogdanm | 0:9b334a45a8ff | 45 | DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMACTRL_CH_CNT * 2] __attribute__ ((aligned(DMACTRL_ALIGNMENT), section("dma"))); |
bogdanm | 0:9b334a45a8ff | 46 | |
bogdanm | 0:9b334a45a8ff | 47 | #else |
bogdanm | 0:9b334a45a8ff | 48 | #error Undefined toolkit, need to define alignment |
bogdanm | 0:9b334a45a8ff | 49 | #endif |
bogdanm | 0:9b334a45a8ff | 50 | |
bogdanm | 0:9b334a45a8ff | 51 | uint32_t channels = 0; // Bit vector of taken channels |
bogdanm | 0:9b334a45a8ff | 52 | bool enabled = false; |
bogdanm | 0:9b334a45a8ff | 53 | |
bogdanm | 0:9b334a45a8ff | 54 | void dma_init(void) |
bogdanm | 0:9b334a45a8ff | 55 | { |
bogdanm | 0:9b334a45a8ff | 56 | if (enabled) return; |
bogdanm | 0:9b334a45a8ff | 57 | DMA_Init_TypeDef dmaInit; |
bogdanm | 0:9b334a45a8ff | 58 | |
bogdanm | 0:9b334a45a8ff | 59 | CMU_ClockEnable(cmuClock_DMA, true); |
bogdanm | 0:9b334a45a8ff | 60 | CMU_ClockEnable(cmuClock_HFPER, true); |
bogdanm | 0:9b334a45a8ff | 61 | |
bogdanm | 0:9b334a45a8ff | 62 | /* Configure general DMA issues */ |
bogdanm | 0:9b334a45a8ff | 63 | dmaInit.hprot = 0; |
bogdanm | 0:9b334a45a8ff | 64 | dmaInit.controlBlock = dmaControlBlock; |
bogdanm | 0:9b334a45a8ff | 65 | DMA_Init(&dmaInit); |
bogdanm | 0:9b334a45a8ff | 66 | enabled = true; |
bogdanm | 0:9b334a45a8ff | 67 | } |
bogdanm | 0:9b334a45a8ff | 68 | |
bogdanm | 0:9b334a45a8ff | 69 | int dma_channel_allocate(uint32_t capabilities) |
bogdanm | 0:9b334a45a8ff | 70 | { |
bogdanm | 0:9b334a45a8ff | 71 | int i; |
bogdanm | 0:9b334a45a8ff | 72 | // Check if 2d copy is required |
bogdanm | 0:9b334a45a8ff | 73 | if (DMA_CAP_2DCOPY & capabilities) { |
bogdanm | 0:9b334a45a8ff | 74 | if (channels & 1) { |
bogdanm | 0:9b334a45a8ff | 75 | // Channel already in use |
bogdanm | 0:9b334a45a8ff | 76 | return DMA_ERROR_OUT_OF_CHANNELS; |
bogdanm | 0:9b334a45a8ff | 77 | } else { |
bogdanm | 0:9b334a45a8ff | 78 | channels |= 1 << 0; |
bogdanm | 0:9b334a45a8ff | 79 | return 0; |
bogdanm | 0:9b334a45a8ff | 80 | } |
bogdanm | 0:9b334a45a8ff | 81 | } |
bogdanm | 0:9b334a45a8ff | 82 | for (i = 1; i < DMA_CHAN_COUNT; i++) { |
bogdanm | 0:9b334a45a8ff | 83 | if ((channels & (1 << i)) == 0) { |
bogdanm | 0:9b334a45a8ff | 84 | // Channel available |
bogdanm | 0:9b334a45a8ff | 85 | channels |= 1 << i; |
bogdanm | 0:9b334a45a8ff | 86 | return i; |
bogdanm | 0:9b334a45a8ff | 87 | } |
bogdanm | 0:9b334a45a8ff | 88 | } |
bogdanm | 0:9b334a45a8ff | 89 | // Check if channel 0 is available |
bogdanm | 0:9b334a45a8ff | 90 | if ((channels & 1 ) == 0) { |
bogdanm | 0:9b334a45a8ff | 91 | channels |= 1 << 0; |
bogdanm | 0:9b334a45a8ff | 92 | return 0; |
bogdanm | 0:9b334a45a8ff | 93 | } |
bogdanm | 0:9b334a45a8ff | 94 | // Couldn't find a channel. |
bogdanm | 0:9b334a45a8ff | 95 | return DMA_ERROR_OUT_OF_CHANNELS; |
bogdanm | 0:9b334a45a8ff | 96 | } |
bogdanm | 0:9b334a45a8ff | 97 | |
bogdanm | 0:9b334a45a8ff | 98 | int dma_channel_free(int channelid) |
bogdanm | 0:9b334a45a8ff | 99 | { |
bogdanm | 0:9b334a45a8ff | 100 | channels &= ~(1 << channelid); |
bogdanm | 0:9b334a45a8ff | 101 | return 0; |
bogdanm | 0:9b334a45a8ff | 102 | } |
bogdanm | 0:9b334a45a8ff | 103 |