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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file stm32_dma.c
* @brief STM32 DMA helper driver code.
*
* @addtogroup STM32_DMA
* @{
*/
#include "ch.h"
#include "hal.h"
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
static cnt_t dmacnt1;
#if STM32_HAS_DMA2
static cnt_t dmacnt2;
#endif
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief STM32 DMA helper initialization.
*
* @init
*/
void dmaInit(void) {
int i;
dmacnt1 = 0;
for (i = STM32_DMA_CHANNEL_7; i >= STM32_DMA_CHANNEL_1; i--)
dmaDisableChannel(STM32_DMA1, i);
STM32_DMA1->IFCR = 0xFFFFFFFF;
#if STM32_HAS_DMA2
dmacnt2 = 0;
for (i = STM32_DMA_CHANNEL_5; i >= STM32_DMA_CHANNEL_1; i--)
dmaDisableChannel(STM32_DMA2, i);
STM32_DMA1->IFCR = 0xFFFFFFFF;
#endif
}
/**
* @brief Enables the specified DMA controller clock.
*
* @param[in] dma the DMA controller id
*
* @api
*/
void dmaEnable(uint32_t dma) {
switch (dma) {
case DMA1_ID:
if (dmacnt1++ == 0) {
RCC->AHBENR |= RCC_AHBENR_DMA1EN;
DMA1->IFCR = 0x0FFFFFFF;
}
break;
#if STM32_HAS_DMA2
case DMA2_ID:
if (dmacnt2++ == 0) {
RCC->AHBENR |= RCC_AHBENR_DMA2EN;
DMA2->IFCR = 0x0FFFFFFF;
}
break;
#endif
}
}
/**
* @brief Disables the specified DMA controller clock.
*
* @param[in] dma the DMA controller id
*
* @api
*/
void dmaDisable(uint32_t dma) {
switch (dma) {
case DMA1_ID:
if (--dmacnt1 == 0)
RCC->AHBENR &= ~RCC_AHBENR_DMA1EN;
break;
#if STM32_HAS_DMA2
case DMA2_ID:
if (--dmacnt2 == 0)
RCC->AHBENR &= ~RCC_AHBENR_DMA2EN;
break;
#endif
}
}
/** @} */
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