127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file stm32_dma.c
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* @brief STM32 DMA helper driver code.
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*
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* @addtogroup STM32_DMA
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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static cnt_t dmacnt1;
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#if STM32_HAS_DMA2
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static cnt_t dmacnt2;
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#endif
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief STM32 DMA helper initialization.
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*
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* @init
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*/
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void dmaInit(void) {
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int i;
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dmacnt1 = 0;
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for (i = STM32_DMA_CHANNEL_7; i >= STM32_DMA_CHANNEL_1; i--)
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dmaDisableChannel(STM32_DMA1, i);
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STM32_DMA1->IFCR = 0xFFFFFFFF;
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#if STM32_HAS_DMA2
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dmacnt2 = 0;
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for (i = STM32_DMA_CHANNEL_5; i >= STM32_DMA_CHANNEL_1; i--)
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dmaDisableChannel(STM32_DMA2, i);
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STM32_DMA1->IFCR = 0xFFFFFFFF;
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#endif
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}
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/**
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* @brief Enables the specified DMA controller clock.
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*
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* @param[in] dma the DMA controller id
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*
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* @api
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*/
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void dmaEnable(uint32_t dma) {
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switch (dma) {
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case DMA1_ID:
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if (dmacnt1++ == 0) {
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RCC->AHBENR |= RCC_AHBENR_DMA1EN;
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DMA1->IFCR = 0x0FFFFFFF;
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}
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break;
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#if STM32_HAS_DMA2
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case DMA2_ID:
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if (dmacnt2++ == 0) {
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RCC->AHBENR |= RCC_AHBENR_DMA2EN;
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DMA2->IFCR = 0x0FFFFFFF;
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}
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break;
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#endif
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}
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}
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/**
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* @brief Disables the specified DMA controller clock.
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*
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* @param[in] dma the DMA controller id
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*
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* @api
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*/
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void dmaDisable(uint32_t dma) {
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switch (dma) {
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case DMA1_ID:
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if (--dmacnt1 == 0)
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RCC->AHBENR &= ~RCC_AHBENR_DMA1EN;
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break;
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#if STM32_HAS_DMA2
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case DMA2_ID:
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if (--dmacnt2 == 0)
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RCC->AHBENR &= ~RCC_AHBENR_DMA2EN;
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break;
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#endif
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}
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}
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/** @} */
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