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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/dma_api.c@548:1abac31e188e, 2015-05-22 (annotated)

Committer:
mbed_official
Date:
Fri May 22 10:45:46 2015 +0100
Revision:
548:1abac31e188e
Parent:
525:c320967f86b9
Child:
627:4fa1328d9c60
Synchronized with git revision 88d158e43b54f97c5e94da305ea9a096889cc81b



Full URL: https://github.com/mbedmicro/mbed/commit/88d158e43b54f97c5e94da305ea9a096889cc81b/



Silicon Labs - Cosmetic: apply mbed coding style to HAL

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 525:c320967f86b9 1 /* mbed Microcontroller Library
mbed_official 525:c320967f86b9 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 525:c320967f86b9 3 *
mbed_official 525:c320967f86b9 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 525:c320967f86b9 5 * you may not use this file except in compliance with the License.
mbed_official 525:c320967f86b9 6 * You may obtain a copy of the License at
mbed_official 525:c320967f86b9 7 *
mbed_official 525:c320967f86b9 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 525:c320967f86b9 9 *
mbed_official 525:c320967f86b9 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 525:c320967f86b9 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 525:c320967f86b9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 525:c320967f86b9 13 * See the License for the specific language governing permissions and
mbed_official 525:c320967f86b9 14 * limitations under the License.
mbed_official 525:c320967f86b9 15 */
mbed_official 525:c320967f86b9 16
mbed_official 525:c320967f86b9 17 #include <stdint.h>
mbed_official 525:c320967f86b9 18 #include "dma_api_HAL.h"
mbed_official 525:c320967f86b9 19 #include "em_dma.h"
mbed_official 525:c320967f86b9 20 #include "em_cmu.h"
mbed_official 525:c320967f86b9 21
mbed_official 525:c320967f86b9 22 /** DMA control block array, requires proper alignment. */
mbed_official 525:c320967f86b9 23 #if defined (__ICCARM__)
mbed_official 525:c320967f86b9 24 #pragma data_alignment=DMACTRL_ALIGNMENT
mbed_official 525:c320967f86b9 25 DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMACTRL_CH_CNT * 2];
mbed_official 525:c320967f86b9 26
mbed_official 525:c320967f86b9 27 #elif defined (__CC_ARM)
mbed_official 525:c320967f86b9 28 DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMACTRL_CH_CNT * 2] __attribute__ ((aligned(DMACTRL_ALIGNMENT)));
mbed_official 525:c320967f86b9 29
mbed_official 525:c320967f86b9 30 #elif defined (__GNUC__)
mbed_official 525:c320967f86b9 31 DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMACTRL_CH_CNT * 2] __attribute__ ((aligned(DMACTRL_ALIGNMENT), section("dma")));
mbed_official 525:c320967f86b9 32
mbed_official 525:c320967f86b9 33 #else
mbed_official 525:c320967f86b9 34 #error Undefined toolkit, need to define alignment
mbed_official 525:c320967f86b9 35 #endif
mbed_official 525:c320967f86b9 36
mbed_official 525:c320967f86b9 37 uint32_t channels = 0; // Bit vector of taken channels
mbed_official 525:c320967f86b9 38 bool enabled = false;
mbed_official 525:c320967f86b9 39
mbed_official 525:c320967f86b9 40 void dma_init(void)
mbed_official 525:c320967f86b9 41 {
mbed_official 548:1abac31e188e 42 if (enabled) return;
mbed_official 548:1abac31e188e 43 DMA_Init_TypeDef dmaInit;
mbed_official 525:c320967f86b9 44
mbed_official 548:1abac31e188e 45 CMU_ClockEnable(cmuClock_DMA, true);
mbed_official 548:1abac31e188e 46 CMU_ClockEnable(cmuClock_HFPER, true);
mbed_official 525:c320967f86b9 47
mbed_official 548:1abac31e188e 48 /* Configure general DMA issues */
mbed_official 548:1abac31e188e 49 dmaInit.hprot = 0;
mbed_official 548:1abac31e188e 50 dmaInit.controlBlock = dmaControlBlock;
mbed_official 548:1abac31e188e 51 DMA_Init(&dmaInit);
mbed_official 548:1abac31e188e 52 enabled = true;
mbed_official 525:c320967f86b9 53 }
mbed_official 525:c320967f86b9 54
mbed_official 525:c320967f86b9 55 int dma_channel_allocate(uint32_t capabilities)
mbed_official 525:c320967f86b9 56 {
mbed_official 548:1abac31e188e 57 int i;
mbed_official 548:1abac31e188e 58 // Check if 2d copy is required
mbed_official 548:1abac31e188e 59 if (DMA_CAP_2DCOPY & capabilities) {
mbed_official 548:1abac31e188e 60 if (channels & 1) {
mbed_official 548:1abac31e188e 61 // Channel already in use
mbed_official 548:1abac31e188e 62 return DMA_ERROR_OUT_OF_CHANNELS;
mbed_official 548:1abac31e188e 63 } else {
mbed_official 548:1abac31e188e 64 channels |= 1 << 0;
mbed_official 548:1abac31e188e 65 return 0;
mbed_official 548:1abac31e188e 66 }
mbed_official 525:c320967f86b9 67 }
mbed_official 548:1abac31e188e 68 for (i = 1; i < DMA_CHAN_COUNT; i++) {
mbed_official 548:1abac31e188e 69 if ((channels & (1 << i)) == 0) {
mbed_official 548:1abac31e188e 70 // Channel available
mbed_official 548:1abac31e188e 71 channels |= 1 << i;
mbed_official 548:1abac31e188e 72 return i;
mbed_official 548:1abac31e188e 73 }
mbed_official 525:c320967f86b9 74 }
mbed_official 548:1abac31e188e 75 // Check if channel 0 is available
mbed_official 548:1abac31e188e 76 if ((channels & 1 ) == 0) {
mbed_official 548:1abac31e188e 77 channels |= 1 << 0;
mbed_official 548:1abac31e188e 78 return 0;
mbed_official 548:1abac31e188e 79 }
mbed_official 548:1abac31e188e 80 // Couldn't find a channel.
mbed_official 548:1abac31e188e 81 return DMA_ERROR_OUT_OF_CHANNELS;
mbed_official 525:c320967f86b9 82 }
mbed_official 525:c320967f86b9 83
mbed_official 548:1abac31e188e 84 int dma_channel_free(int channelid)
mbed_official 525:c320967f86b9 85 {
mbed_official 548:1abac31e188e 86 channels &= ~(1 << channelid);
mbed_official 548:1abac31e188e 87 return 0;
mbed_official 525:c320967f86b9 88 }
mbed_official 525:c320967f86b9 89