diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/lpc24xx/misc/dma.c')
| -rw-r--r-- | c/src/lib/libbsp/arm/lpc24xx/misc/dma.c | 67 |
1 files changed, 22 insertions, 45 deletions
diff --git a/c/src/lib/libbsp/arm/lpc24xx/misc/dma.c b/c/src/lib/libbsp/arm/lpc24xx/misc/dma.c index 5b3ba6fa0b..96b04d761c 100644 --- a/c/src/lib/libbsp/arm/lpc24xx/misc/dma.c +++ b/c/src/lib/libbsp/arm/lpc24xx/misc/dma.c @@ -1,9 +1,9 @@ /** * @file * - * @ingroup lpc24xx + * @ingroup lpc24xx_dma * - * @brief DMA support. + * @brief Direct memory access (DMA) support. */ /* @@ -12,10 +12,11 @@ * Obere Lagerstr. 30 * D-82178 Puchheim * Germany - * rtems@embedded-brains.de + * <rtems@embedded-brains.de> * - * The license and distribution terms for this file may be found in the file - * LICENSE in this distribution or at http://www.rtems.com/license/LICENSE. + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.com/license/LICENSE. */ #include <rtems/endian.h> @@ -29,9 +30,6 @@ */ static bool lpc24xx_dma_channel_occupation [GPDMA_CH_NUMBER]; -/** - * @brief Initializes the general purpose DMA. - */ void lpc24xx_dma_initialize(void) { rtems_interrupt_level level; @@ -57,13 +55,6 @@ void lpc24xx_dma_initialize(void) GPDMA_SYNC = 0; } -/** - * @brief Tries to obtain the channel @a channel. - * - * @retval RTEMS_SUCCESSFUL Successful operation. - * @retval RTEMS_INVALID_ID Invalid channel number. - * @retval RTEMS_RESOURCE_IN_USE Channel already occupied. - */ rtems_status_code lpc24xx_dma_channel_obtain(unsigned channel) { if (channel < GPDMA_CH_NUMBER) { @@ -81,14 +72,6 @@ rtems_status_code lpc24xx_dma_channel_obtain(unsigned channel) } } -/** - * @brief Releases the channel @a channel. - * - * You must have obtained this channel with lpc24xx_dma_channel_obtain() - * previously. - * - * If the channel number @a channel is out of range nothing will happen. - */ void lpc24xx_dma_channel_release(unsigned channel) { if (channel < GPDMA_CH_NUMBER) { @@ -96,29 +79,23 @@ void lpc24xx_dma_channel_release(unsigned channel) } } -/** - * @brief Disables the channel @a channel. - * - * If @a force is false the channel will be halted and disabled when the - * channel is inactive. - * - * If the channel number @a channel is out of range the behaviour is undefined. - */ void lpc24xx_dma_channel_disable(unsigned channel, bool force) { - volatile lpc24xx_dma_channel *ch = GPDMA_CH_BASE_ADDR(channel); - uint32_t cfg = ch->cfg; - - if (!force) { - /* Halt */ - ch->cfg = SET_FLAG(cfg, GPDMA_CH_CFG_HALT); - - /* Wait for inactive */ - do { - cfg = ch->cfg; - } while (IS_FLAG_SET(cfg, GPDMA_CH_CFG_ACTIVE)); + if (channel < GPDMA_CH_NUMBER) { + volatile lpc24xx_dma_channel *ch = GPDMA_CH_BASE_ADDR(channel); + uint32_t cfg = ch->cfg; + + if (!force) { + /* Halt */ + ch->cfg = SET_FLAG(cfg, GPDMA_CH_CFG_HALT); + + /* Wait for inactive */ + do { + cfg = ch->cfg; + } while (IS_FLAG_SET(cfg, GPDMA_CH_CFG_ACTIVE)); + } + + /* Disable */ + ch->cfg = CLEAR_FLAG(cfg, GPDMA_CH_CFG_EN); } - - /* Disable */ - ch->cfg = CLEAR_FLAG(cfg, GPDMA_CH_CFG_EN); } |