twr_dma

Driver for DMA. More...

Data Structures
struct	twr_dma_channel_config_t
	DMA channel configuration. More...

Enumerations
enum	twr_dma_channel_t {   TWR_DMA_CHANNEL_1 = 0,   TWR_DMA_CHANNEL_2 = 1,   TWR_DMA_CHANNEL_3 = 2,   TWR_DMA_CHANNEL_4 = 3,   TWR_DMA_CHANNEL_5 = 4,   TWR_DMA_CHANNEL_6 = 5,   TWR_DMA_CHANNEL_7 = 6 }
	DMA channels. More...
enum	twr_dma_request_t {   TWR_DMA_REQUEST_0 = 0,   TWR_DMA_REQUEST_1 = 1,   TWR_DMA_REQUEST_2 = 2,   TWR_DMA_REQUEST_3 = 3,   TWR_DMA_REQUEST_4 = 4,   TWR_DMA_REQUEST_5 = 5,   TWR_DMA_REQUEST_6 = 6,   TWR_DMA_REQUEST_7 = 7,   TWR_DMA_REQUEST_8 = 8,   TWR_DMA_REQUEST_9 = 9,   TWR_DMA_REQUEST_10 = 10,   TWR_DMA_REQUEST_11 = 11,   TWR_DMA_REQUEST_12 = 12,   TWR_DMA_REQUEST_13 = 13,   TWR_DMA_REQUEST_14 = 14,   TWR_DMA_REQUEST_15 = 15 }
	DMA requests. More...
enum	twr_dma_direction_t {   TWR_DMA_DIRECTION_TO_PERIPHERAL = 0,   TWR_DMA_DIRECTION_TO_RAM = 1 }
	DMA channel directions. More...
enum	twr_dma_size_t {   TWR_DMA_SIZE_1 = 0,   TWR_DMA_SIZE_2 = 1,   TWR_DMA_SIZE_4 = 2 }
	DMA channel data size. More...
enum	twr_dma_mode_t {   TWR_DMA_MODE_STANDARD = 0,   TWR_DMA_MODE_CIRCULAR = 1 }
	DMA channel mode. More...
enum	twr_dma_event_t {   TWR_DMA_EVENT_ERROR = 0,   TWR_DMA_EVENT_HALF_DONE = 1,   TWR_DMA_EVENT_DONE = 2 }
	DMA channel event. More...
enum	twr_dma_priority_t {   TWR_DMA_PRIORITY_LOW = 0,   TWR_DMA_PRIORITY_MEDIUM = 1,   TWR_DMA_PRIORITY_HIGH = 2,   TWR_DMA_PRIORITY_VERY_HIGH = 3 }
	DMA channel priority. More...

Functions
void	twr_dma_init (void)
	Initialize DMA.
void	twr_dma_channel_config (twr_dma_channel_t channel, twr_dma_channel_config_t *config)
	Configure DMA channel. More...
void	twr_dma_set_event_handler (twr_dma_channel_t channel, void(*event_handler)(twr_dma_channel_t, twr_dma_event_t, void *), void *event_param)
	Set callback function. More...
void	twr_dma_channel_run (twr_dma_channel_t channel)
	Start DMA channel. More...
void	twr_dma_channel_stop (twr_dma_channel_t channel)
	Stop DMA channel. More...
size_t	twr_dma_channel_get_length (twr_dma_channel_t channel)

Detailed Description

Driver for DMA.

Enumeration Type Documentation

twr_dma_channel_t

enum twr_dma_channel_t

DMA channels.

Enumerator
TWR_DMA_CHANNEL_1	DMA channel 1.
TWR_DMA_CHANNEL_2	DMA channel 2.
TWR_DMA_CHANNEL_3	DMA channel 3.
TWR_DMA_CHANNEL_4	DMA channel 4.
TWR_DMA_CHANNEL_5	DMA channel 5, used for SPI.
TWR_DMA_CHANNEL_6	DMA channel 6.
TWR_DMA_CHANNEL_7	DMA channel 7.

Definition at line 12 of file twr_dma.h.

twr_dma_direction_t

enum twr_dma_direction_t

DMA channel directions.

Enumerator
TWR_DMA_DIRECTION_TO_PERIPHERAL	DMA channel direction from RAM to peripheral.
TWR_DMA_DIRECTION_TO_RAM	DMA channel direction from peripheral to RAM.

Definition at line 93 of file twr_dma.h.

twr_dma_event_t

enum twr_dma_event_t

DMA channel event.

Enumerator
TWR_DMA_EVENT_ERROR	DMA channel event error.
TWR_DMA_EVENT_HALF_DONE	DMA channel event half done.
TWR_DMA_EVENT_DONE	DMA channel event done.

Definition at line 132 of file twr_dma.h.

twr_dma_mode_t

enum twr_dma_mode_t

DMA channel mode.

Enumerator
TWR_DMA_MODE_STANDARD	DMA channel mode standard.
TWR_DMA_MODE_CIRCULAR	DMA channel mode circular.

Definition at line 120 of file twr_dma.h.

twr_dma_priority_t

enum twr_dma_priority_t

DMA channel priority.

Enumerator
TWR_DMA_PRIORITY_LOW	DMA channel priority is low.
TWR_DMA_PRIORITY_MEDIUM	DMA channel priority is medium.
TWR_DMA_PRIORITY_HIGH	DMA channel priority is high.
TWR_DMA_PRIORITY_VERY_HIGH	DMA channel priority is very high.

Definition at line 147 of file twr_dma.h.

twr_dma_request_t

enum twr_dma_request_t

DMA requests.

Enumerator
TWR_DMA_REQUEST_0	DMA request 0.
TWR_DMA_REQUEST_1	DMA request 1.
TWR_DMA_REQUEST_2	DMA request 2.
TWR_DMA_REQUEST_3	DMA request 3.
TWR_DMA_REQUEST_4	DMA request 4.
TWR_DMA_REQUEST_5	DMA request 5.
TWR_DMA_REQUEST_6	DMA request 6.
TWR_DMA_REQUEST_7	DMA request 7.
TWR_DMA_REQUEST_8	DMA request 8.
TWR_DMA_REQUEST_9	DMA request 9.
TWR_DMA_REQUEST_10	DMA request 10.
TWR_DMA_REQUEST_11	DMA request 11.
TWR_DMA_REQUEST_12	DMA request 12.
TWR_DMA_REQUEST_13	DMA request 13.
TWR_DMA_REQUEST_14	DMA request 14.
TWR_DMA_REQUEST_15	DMA request 15.

Definition at line 39 of file twr_dma.h.

twr_dma_size_t

enum twr_dma_size_t

DMA channel data size.

Enumerator
TWR_DMA_SIZE_1	DMA channel data size 1B.
TWR_DMA_SIZE_2	DMA channel data size 2B.
TWR_DMA_SIZE_4	DMA channel data size 4B.

Definition at line 105 of file twr_dma.h.

Function Documentation

twr_dma_channel_config()

void twr_dma_channel_config	(	twr_dma_channel_t	channel,
		twr_dma_channel_config_t *	config
	)

Configure DMA channel.

Parameters

[in]	channel	DMA channel
[in]	config	Pointer to DMA channel configuration

Definition at line 95 of file twr_dma.c.

Referenced by twr_dac_async_run(), twr_spi_async_transfer(), and twr_uart_async_read_start().

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twr_dma_channel_run()

void twr_dma_channel_run

(

twr_dma_channel_t

channel

)

Start DMA channel.

Parameters

[in]

channel

DMA channel

Definition at line 179 of file twr_dma.c.

Referenced by twr_dac_async_run(), twr_spi_async_transfer(), and twr_uart_async_read_start().

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twr_dma_channel_stop()

void twr_dma_channel_stop

(

twr_dma_channel_t

channel

)

Stop DMA channel.

Parameters

[in]

channel

DMA channel

Definition at line 184 of file twr_dma.c.

Referenced by twr_dac_async_stop(), and twr_uart_async_read_cancel().

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twr_dma_set_event_handler()

void twr_dma_set_event_handler	(	twr_dma_channel_t	channel,
		void(*)(twr_dma_channel_t, twr_dma_event_t, void *)	event_handler,
		void *	event_param
	)

Set callback function.

Parameters

[in]	channel	DMA channel
[in]	event_handler	Function address
[in]	event_param	Optional event parameter (can be NULL)

Definition at line 173 of file twr_dma.c.

Referenced by twr_dac_async_run(), and twr_spi_init().

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