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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

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Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/dma_api.c@627:4fa1328d9c60, 2015-09-25 (annotated)

Committer:
mbed_official
Date:
Fri Sep 25 14:15:10 2015 +0100
Revision:
627:4fa1328d9c60
Parent:
548:1abac31e188e 
Synchronized with git revision fe238a91ab7a4d1d72c4cab9da04967c619d54ad



Full URL: https://github.com/mbedmicro/mbed/commit/fe238a91ab7a4d1d72c4cab9da04967c619d54ad/



Silicon Labs - Add support for low-power async Serial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 627:4fa1328d9c60 1 /***************************************************************************//**
mbed_official 627:4fa1328d9c60 2 * @file dma_api.c
mbed_official 627:4fa1328d9c60 3 *******************************************************************************
mbed_official 627:4fa1328d9c60 4 * @section License
mbed_official 627:4fa1328d9c60 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
mbed_official 627:4fa1328d9c60 6 *******************************************************************************
mbed_official 525:c320967f86b9 7 *
mbed_official 627:4fa1328d9c60 8 * Permission is granted to anyone to use this software for any purpose,
mbed_official 627:4fa1328d9c60 9 * including commercial applications, and to alter it and redistribute it
mbed_official 627:4fa1328d9c60 10 * freely, subject to the following restrictions:
mbed_official 525:c320967f86b9 11 *
mbed_official 627:4fa1328d9c60 12 * 1. The origin of this software must not be misrepresented; you must not
mbed_official 627:4fa1328d9c60 13 * claim that you wrote the original software.
mbed_official 627:4fa1328d9c60 14 * 2. Altered source versions must be plainly marked as such, and must not be
mbed_official 627:4fa1328d9c60 15 * misrepresented as being the original software.
mbed_official 627:4fa1328d9c60 16 * 3. This notice may not be removed or altered from any source distribution.
mbed_official 525:c320967f86b9 17 *
mbed_official 627:4fa1328d9c60 18 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
mbed_official 627:4fa1328d9c60 19 * obligation to support this Software. Silicon Labs is providing the
mbed_official 627:4fa1328d9c60 20 * Software "AS IS", with no express or implied warranties of any kind,
mbed_official 627:4fa1328d9c60 21 * including, but not limited to, any implied warranties of merchantability
mbed_official 627:4fa1328d9c60 22 * or fitness for any particular purpose or warranties against infringement
mbed_official 627:4fa1328d9c60 23 * of any proprietary rights of a third party.
mbed_official 627:4fa1328d9c60 24 *
mbed_official 627:4fa1328d9c60 25 * Silicon Labs will not be liable for any consequential, incidental, or
mbed_official 627:4fa1328d9c60 26 * special damages, or any other relief, or for any claim by any third party,
mbed_official 627:4fa1328d9c60 27 * arising from your use of this Software.
mbed_official 627:4fa1328d9c60 28 *
mbed_official 627:4fa1328d9c60 29 ******************************************************************************/
mbed_official 525:c320967f86b9 30
mbed_official 525:c320967f86b9 31 #include <stdint.h>
mbed_official 525:c320967f86b9 32 #include "dma_api_HAL.h"
mbed_official 525:c320967f86b9 33 #include "em_dma.h"
mbed_official 525:c320967f86b9 34 #include "em_cmu.h"
mbed_official 525:c320967f86b9 35
mbed_official 525:c320967f86b9 36 /** DMA control block array, requires proper alignment. */
mbed_official 525:c320967f86b9 37 #if defined (__ICCARM__)
mbed_official 525:c320967f86b9 38 #pragma data_alignment=DMACTRL_ALIGNMENT
mbed_official 525:c320967f86b9 39 DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMACTRL_CH_CNT * 2];
mbed_official 525:c320967f86b9 40
mbed_official 525:c320967f86b9 41 #elif defined (__CC_ARM)
mbed_official 525:c320967f86b9 42 DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMACTRL_CH_CNT * 2] __attribute__ ((aligned(DMACTRL_ALIGNMENT)));
mbed_official 525:c320967f86b9 43
mbed_official 525:c320967f86b9 44 #elif defined (__GNUC__)
mbed_official 525:c320967f86b9 45 DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMACTRL_CH_CNT * 2] __attribute__ ((aligned(DMACTRL_ALIGNMENT), section("dma")));
mbed_official 525:c320967f86b9 46
mbed_official 525:c320967f86b9 47 #else
mbed_official 525:c320967f86b9 48 #error Undefined toolkit, need to define alignment
mbed_official 525:c320967f86b9 49 #endif
mbed_official 525:c320967f86b9 50
mbed_official 525:c320967f86b9 51 uint32_t channels = 0; // Bit vector of taken channels
mbed_official 525:c320967f86b9 52 bool enabled = false;
mbed_official 525:c320967f86b9 53
mbed_official 525:c320967f86b9 54 void dma_init(void)
mbed_official 525:c320967f86b9 55 {
mbed_official 548:1abac31e188e 56 if (enabled) return;
mbed_official 548:1abac31e188e 57 DMA_Init_TypeDef dmaInit;
mbed_official 525:c320967f86b9 58
mbed_official 548:1abac31e188e 59 CMU_ClockEnable(cmuClock_DMA, true);
mbed_official 548:1abac31e188e 60 CMU_ClockEnable(cmuClock_HFPER, true);
mbed_official 525:c320967f86b9 61
mbed_official 548:1abac31e188e 62 /* Configure general DMA issues */
mbed_official 548:1abac31e188e 63 dmaInit.hprot = 0;
mbed_official 548:1abac31e188e 64 dmaInit.controlBlock = dmaControlBlock;
mbed_official 548:1abac31e188e 65 DMA_Init(&dmaInit);
mbed_official 548:1abac31e188e 66 enabled = true;
mbed_official 525:c320967f86b9 67 }
mbed_official 525:c320967f86b9 68
mbed_official 525:c320967f86b9 69 int dma_channel_allocate(uint32_t capabilities)
mbed_official 525:c320967f86b9 70 {
mbed_official 548:1abac31e188e 71 int i;
mbed_official 548:1abac31e188e 72 // Check if 2d copy is required
mbed_official 548:1abac31e188e 73 if (DMA_CAP_2DCOPY & capabilities) {
mbed_official 548:1abac31e188e 74 if (channels & 1) {
mbed_official 548:1abac31e188e 75 // Channel already in use
mbed_official 548:1abac31e188e 76 return DMA_ERROR_OUT_OF_CHANNELS;
mbed_official 548:1abac31e188e 77 } else {
mbed_official 548:1abac31e188e 78 channels |= 1 << 0;
mbed_official 548:1abac31e188e 79 return 0;
mbed_official 548:1abac31e188e 80 }
mbed_official 525:c320967f86b9 81 }
mbed_official 548:1abac31e188e 82 for (i = 1; i < DMA_CHAN_COUNT; i++) {
mbed_official 548:1abac31e188e 83 if ((channels & (1 << i)) == 0) {
mbed_official 548:1abac31e188e 84 // Channel available
mbed_official 548:1abac31e188e 85 channels |= 1 << i;
mbed_official 548:1abac31e188e 86 return i;
mbed_official 548:1abac31e188e 87 }
mbed_official 525:c320967f86b9 88 }
mbed_official 548:1abac31e188e 89 // Check if channel 0 is available
mbed_official 548:1abac31e188e 90 if ((channels & 1 ) == 0) {
mbed_official 548:1abac31e188e 91 channels |= 1 << 0;
mbed_official 548:1abac31e188e 92 return 0;
mbed_official 548:1abac31e188e 93 }
mbed_official 548:1abac31e188e 94 // Couldn't find a channel.
mbed_official 548:1abac31e188e 95 return DMA_ERROR_OUT_OF_CHANNELS;
mbed_official 525:c320967f86b9 96 }
mbed_official 525:c320967f86b9 97
mbed_official 548:1abac31e188e 98 int dma_channel_free(int channelid)
mbed_official 525:c320967f86b9 99 {
mbed_official 548:1abac31e188e 100 channels &= ~(1 << channelid);
mbed_official 548:1abac31e188e 101 return 0;
mbed_official 525:c320967f86b9 102 }
mbed_official 525:c320967f86b9 103