libopencm3
A free/libre/open-source firmware library for various ARM Cortex-M3 microcontrollers.
DMA peripheral API
Collaboration diagram for DMA peripheral API:

Macros

#define CHANNEL_SUPPORT_LOOP(ch)   (((ch) == DMA_CH0) || ((ch) == DMA_CH1))
 

Functions

void dma_enable_with_privileged_access (void)
 Enable DMA with privileged access. More...
 
void dma_enable_with_unprivileged_access (void)
 Enable DMA with un-privileged access. More...
 
void dma_enable (void)
 same as dma_enable_with_unprivileged_access() More...
 
void dma_disable (void)
 Disable DMA. More...
 
void dma_set_desc_address (uint32_t desc_base)
 Set channel's descriptor address. More...
 
bool dma_get_wait_on_request_flag (enum dma_ch ch)
 Get channel wait on request status flag. More...
 
void dma_generate_software_request (enum dma_ch ch)
 Generate a software request on channel. More...
 
void dma_enable_burst_only (enum dma_ch ch)
 Enable channel burst only. More...
 
void dma_enable_single_and_burst (enum dma_ch ch)
 Enable channel single and burst. More...
 
void dma_enable_periph_request (enum dma_ch ch)
 Enable channel peripherial request. More...
 
void dma_disable_periph_request (enum dma_ch ch)
 Disable channel peripherial request. More...
 
void dma_enable_channel (enum dma_ch ch)
 Enable channel. More...
 
void dma_disable_channel (enum dma_ch ch)
 Disable channel. More...
 
void dma_disable_alternate_structure (enum dma_ch ch)
 Disable channel alternate structure. More...
 
void dma_enable_alternate_structure (enum dma_ch ch)
 Enable channel alternate structure. More...
 
void dma_enable_priority (enum dma_ch ch)
 Enable channel high priority. More...
 
void dma_disable_priority (enum dma_ch ch)
 Disable channel high priority. More...
 
bool dma_get_bus_error_flag (void)
 Get bus error flag. More...
 
void dma_clear_bus_error_flag (void)
 Clear bus error flag. More...
 
bool dma_get_request_flag (enum dma_ch ch)
 Get channel request flag. More...
 
bool dma_get_bus_error_interrupt_flag (void)
 Get bus error interrupt flag. More...
 
bool dma_get_done_interrupt_flag (enum dma_ch ch)
 Get channel done interrupt flag. More...
 
void dma_set_bus_error_interrupt_flag (void)
 Set bus error interrupt flag. More...
 
void dma_set_done_interrupt_flag (enum dma_ch ch)
 Set channel done interrupt flag. More...
 
void dma_clear_bus_error_interrupt_flag (void)
 Clear bus error interrupt flag. More...
 
void dma_clear_done_interrupt_flag (enum dma_ch ch)
 Clear channel done interrupt flag. More...
 
void dma_enable_bus_error_interrupt (void)
 Enable bus error interrupt. More...
 
void dma_disable_bus_error_interrupt (void)
 Disable bus error interrupt. More...
 
void dma_enable_done_interrupt (enum dma_ch ch)
 Enable channel done interrupt. More...
 
void dma_disable_done_interrupt (enum dma_ch ch)
 Disable channel done interrupt. More...
 
void dma_set_source (enum dma_ch ch, uint32_t source)
 Set channel source. More...
 
void dma_set_signal (enum dma_ch ch, uint32_t signal)
 Set channel source signal. More...
 
void dma_channel_reset (enum dma_ch ch)
 Reset channel. More...
 
void dma_set_loop_count (enum dma_ch ch, uint16_t count)
 Set channel loop width to ( count + 1) More...
 
void dma_enable_loop (enum dma_ch ch)
 Enable channel loop. More...
 
void dma_disable_loop (enum dma_ch ch)
 Disable channel loop. More...
 
void dma_desc_set_dest_size (uint32_t desc_base, enum dma_ch ch, enum dma_mem size)
 Set desination size. More...
 
void dma_desc_set_dest_inc (uint32_t desc_base, enum dma_ch ch, enum dma_mem inc)
 Set destination increment. More...
 
void dma_desc_set_src_size (uint32_t desc_base, enum dma_ch ch, enum dma_mem size)
 Set source size. More...
 
void dma_desc_set_src_inc (uint32_t desc_base, enum dma_ch ch, enum dma_mem inc)
 Set source increment. More...
 
void dma_desc_set_r_power (uint32_t desc_base, enum dma_ch ch, enum dma_r_power r_power)
 Set R Power. More...
 
void dma_desc_enable_next_useburst (uint32_t desc_base, enum dma_ch ch)
 Enable next useburst. More...
 
void dma_desc_disable_next_useburst (uint32_t desc_base, enum dma_ch ch)
 Disable next useburst. More...
 
void dma_desc_set_count (uint32_t desc_base, enum dma_ch ch, uint16_t count)
 Set number (count) of transfer to be performed. More...
 
void dma_desc_set_user_data (uint32_t desc_base, enum dma_ch ch, uint32_t user_data)
 Store user data field in channel descriptor. More...
 
uint32_t dma_desc_get_user_data (uint32_t desc_base, enum dma_ch ch)
 Extract user data field from channel descriptor. More...
 
static uint32_t dma_calc_end_from_start (uint32_t start, uint8_t inc, uint16_t n_minus_1)
 Calculate end from start address. More...
 
void dma_desc_set_src_address (uint32_t desc_base, enum dma_ch ch, uint32_t src_start)
 Assign Source address to DMA Channel. More...
 
void dma_desc_set_dest_address (uint32_t desc_base, enum dma_ch ch, uint32_t dest_start)
 Assign Destination address to DMA Channel. More...
 
void dma_desc_set_mode (uint32_t desc_base, enum dma_ch ch, enum dma_mode mode)
 Set the channel mode ("Cycle control") More...
 

Detailed Description

Macro Definition Documentation

◆ CHANNEL_SUPPORT_LOOP

#define CHANNEL_SUPPORT_LOOP (   ch)    (((ch) == DMA_CH0) || ((ch) == DMA_CH1))

Definition at line 27 of file dma_common.c.

Function Documentation

◆ dma_calc_end_from_start()

static uint32_t dma_calc_end_from_start ( uint32_t  start,
uint8_t  inc,
uint16_t  n_minus_1 
)
inlinestatic

Calculate end from start address.

See "8.4.3.4 Address calculation" p68, EFM32LG-RM "d0183_Rev1.10"

Parameters
[in]startaddress to start of memory
[in]incIncrement (use DMA_MEM_*)
[in]n_minus_1the number of transfers minus 1 (ie count - 1)
Returns
the calculate end address
Note
can be used to calculate {source, destination} end address

Definition at line 548 of file dma_common.c.

References DMA_MEM_BYTE, DMA_MEM_HALF_WORD, DMA_MEM_NONE, and DMA_MEM_WORD.

Referenced by dma_desc_set_dest_address(), and dma_desc_set_src_address().

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◆ dma_channel_reset()

void dma_channel_reset ( enum dma_ch  ch)

Reset channel.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 334 of file dma_common.c.

References CHANNEL_SUPPORT_LOOP, DMA_CHALTC, DMA_CHALTC_CHxSALTC, DMA_CHENC, DMA_CHENC_CHxSENC, DMA_CHPRIC, DMA_CHPRIC_CHxSPRIC, DMA_CHx_CTRL, DMA_IFC, DMA_IFC_CHxDONE, and DMA_LOOPx.

◆ dma_clear_bus_error_flag()

void dma_clear_bus_error_flag ( void  )

Clear bus error flag.

Definition at line 201 of file dma_common.c.

References DMA_ERRORC, and DMA_ERRORC_ERRORC.

◆ dma_clear_bus_error_interrupt_flag()

void dma_clear_bus_error_interrupt_flag ( void  )

Clear bus error interrupt flag.

Definition at line 260 of file dma_common.c.

References DMA_IFC, and DMA_IFC_ERR.

◆ dma_clear_done_interrupt_flag()

void dma_clear_done_interrupt_flag ( enum dma_ch  ch)

Clear channel done interrupt flag.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 269 of file dma_common.c.

References DMA_IFC, and DMA_IFC_CHxDONE.

◆ dma_desc_disable_next_useburst()

void dma_desc_disable_next_useburst ( uint32_t  desc_base,
enum dma_ch  ch 
)

Disable next useburst.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)

Definition at line 491 of file dma_common.c.

References DMA_DESC_CH_CFG_NEXT_USEBURST, and DMA_DESC_CHx_CFG.

◆ dma_desc_enable_next_useburst()

void dma_desc_enable_next_useburst ( uint32_t  desc_base,
enum dma_ch  ch 
)

Enable next useburst.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)

Definition at line 480 of file dma_common.c.

References DMA_DESC_CHx_CFG.

◆ dma_desc_get_user_data()

uint32_t dma_desc_get_user_data ( uint32_t  desc_base,
enum dma_ch  ch 
)

Extract user data field from channel descriptor.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
Returns
user data

Definition at line 531 of file dma_common.c.

References DMA_DESC_CHx_USER_DATA.

◆ dma_desc_set_count()

void dma_desc_set_count ( uint32_t  desc_base,
enum dma_ch  ch,
uint16_t  count 
)

Set number (count) of transfer to be performed.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]countCount

Definition at line 503 of file dma_common.c.

References DMA_DESC_CH_CFG_N_MINUS_1, and DMA_DESC_CHx_CFG.

◆ dma_desc_set_dest_address()

void dma_desc_set_dest_address ( uint32_t  desc_base,
enum dma_ch  ch,
uint32_t  dest_start 
)

Assign Destination address to DMA Channel.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]dest_startDestination data start address this function uses dma_calc_end_from_start to calculate the dest data end address from dest_start
Note
dma_desc_set_count() should be called first.
dma_desc_set_dest_inc() should be called first.

Definition at line 599 of file dma_common.c.

References dma_calc_end_from_start(), DMA_DESC_CH_CFG_DEST_INC_MASK, DMA_DESC_CH_CFG_DEST_INC_SHIFT, DMA_DESC_CH_CFG_N_MINUS_1_MASK, DMA_DESC_CH_CFG_N_MINUS_1_SHIFT, DMA_DESC_CHx_CFG, and DMA_DESC_CHx_DEST_DATA_END_PTR.

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◆ dma_desc_set_dest_inc()

void dma_desc_set_dest_inc ( uint32_t  desc_base,
enum dma_ch  ch,
enum dma_mem  inc 
)

Set destination increment.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]incIncrement (use DMA_MEM_*)

Definition at line 417 of file dma_common.c.

References DMA_DESC_CH_CFG_DEST_INC, and DMA_DESC_CHx_CFG.

◆ dma_desc_set_dest_size()

void dma_desc_set_dest_size ( uint32_t  desc_base,
enum dma_ch  ch,
enum dma_mem  size 
)

Set desination size.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]sizeSize (use DMA_MEM_*)

Definition at line 401 of file dma_common.c.

References DMA_DESC_CH_CFG_DEST_SIZE, and DMA_DESC_CHx_CFG.

◆ dma_desc_set_mode()

void dma_desc_set_mode ( uint32_t  desc_base,
enum dma_ch  ch,
enum dma_mode  mode 
)

Set the channel mode ("Cycle control")

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]modeMode (use DMA_MODE_*)

Definition at line 619 of file dma_common.c.

References DMA_DESC_CH_CFG_CYCLE_CTRL, and DMA_DESC_CHx_CFG.

◆ dma_desc_set_r_power()

void dma_desc_set_r_power ( uint32_t  desc_base,
enum dma_ch  ch,
enum dma_r_power  r_power 
)

Set R Power.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]r_powerR Power (Use DMA_R_POWER_*)

Definition at line 465 of file dma_common.c.

References DMA_DESC_CH_CFG_R_POWER, and DMA_DESC_CHx_CFG.

◆ dma_desc_set_src_address()

void dma_desc_set_src_address ( uint32_t  desc_base,
enum dma_ch  ch,
uint32_t  src_start 
)

Assign Source address to DMA Channel.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]src_startSource data start address this function uses dma_calc_end_from_start to calculate the src data end address from src_start
Note
dma_desc_set_count() should be called first.
dma_desc_set_src_inc() should be called first.

Definition at line 576 of file dma_common.c.

References dma_calc_end_from_start(), DMA_DESC_CH_CFG_N_MINUS_1_MASK, DMA_DESC_CH_CFG_N_MINUS_1_SHIFT, DMA_DESC_CH_CFG_SRC_INC_MASK, DMA_DESC_CH_CFG_SRC_INC_SHIFT, DMA_DESC_CHx_CFG, and DMA_DESC_CHx_SRC_DATA_END_PTR.

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◆ dma_desc_set_src_inc()

void dma_desc_set_src_inc ( uint32_t  desc_base,
enum dma_ch  ch,
enum dma_mem  inc 
)

Set source increment.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]incIncrement (use DMA_MEM_*)

Definition at line 449 of file dma_common.c.

References DMA_DESC_CH_CFG_SRC_INC, and DMA_DESC_CHx_CFG.

◆ dma_desc_set_src_size()

void dma_desc_set_src_size ( uint32_t  desc_base,
enum dma_ch  ch,
enum dma_mem  size 
)

Set source size.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]sizeSize (use DMA_MEM_*)

Definition at line 433 of file dma_common.c.

References DMA_DESC_CH_CFG_SRC_SIZE, and DMA_DESC_CHx_CFG.

◆ dma_desc_set_user_data()

void dma_desc_set_user_data ( uint32_t  desc_base,
enum dma_ch  ch,
uint32_t  user_data 
)

Store user data field in channel descriptor.

Parameters
[in]desc_basestart of memory location that contain channel descriptor
[in]chChannel (use DMA_CHx)
[in]user_dataUser data

Definition at line 518 of file dma_common.c.

References DMA_DESC_CHx_USER_DATA.

◆ dma_disable()

void dma_disable ( void  )

Disable DMA.

Definition at line 59 of file dma_common.c.

References DMA_CONFIG.

◆ dma_disable_alternate_structure()

void dma_disable_alternate_structure ( enum dma_ch  ch)

Disable channel alternate structure.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 156 of file dma_common.c.

References DMA_CHALTC, and DMA_CHALTC_CHxSALTC.

◆ dma_disable_bus_error_interrupt()

void dma_disable_bus_error_interrupt ( void  )

Disable bus error interrupt.

Definition at line 285 of file dma_common.c.

References DMA_IEN.

◆ dma_disable_channel()

void dma_disable_channel ( enum dma_ch  ch)

Disable channel.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 147 of file dma_common.c.

References DMA_CHENC, and DMA_CHENC_CHxSENC.

◆ dma_disable_done_interrupt()

void dma_disable_done_interrupt ( enum dma_ch  ch)

Disable channel done interrupt.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 303 of file dma_common.c.

References DMA_IEN.

◆ dma_disable_loop()

void dma_disable_loop ( enum dma_ch  ch)

Disable channel loop.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 385 of file dma_common.c.

References CHANNEL_SUPPORT_LOOP, and DMA_LOOPx.

◆ dma_disable_periph_request()

void dma_disable_periph_request ( enum dma_ch  ch)

Disable channel peripherial request.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 129 of file dma_common.c.

References DMA_CHREQMASKS, and DMA_CHREQMASKS_CHxSREQMASKS.

◆ dma_disable_priority()

void dma_disable_priority ( enum dma_ch  ch)

Disable channel high priority.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 183 of file dma_common.c.

References DMA_CHPRIC, and DMA_CHPRIC_CHxSPRIC.

◆ dma_enable()

void dma_enable ( void  )

same as dma_enable_with_unprivileged_access()

See also
dma_enable_with_unprivileged_access()

Definition at line 51 of file dma_common.c.

References dma_enable_with_unprivileged_access().

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◆ dma_enable_alternate_structure()

void dma_enable_alternate_structure ( enum dma_ch  ch)

Enable channel alternate structure.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 165 of file dma_common.c.

References DMA_CHALTS, and DMA_CHALTS_CHxSALTS.

◆ dma_enable_burst_only()

void dma_enable_burst_only ( enum dma_ch  ch)

Enable channel burst only.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 102 of file dma_common.c.

References DMA_CHUSEBURSTS, and DMA_CHUSEBURSTS_CHxSUSEBURSTS.

◆ dma_enable_bus_error_interrupt()

void dma_enable_bus_error_interrupt ( void  )

Enable bus error interrupt.

Definition at line 277 of file dma_common.c.

References DMA_IEN, and DMA_IEN_ERR.

◆ dma_enable_channel()

void dma_enable_channel ( enum dma_ch  ch)

Enable channel.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 138 of file dma_common.c.

References DMA_CHENS, and DMA_CHENS_CHxSENS.

◆ dma_enable_done_interrupt()

void dma_enable_done_interrupt ( enum dma_ch  ch)

Enable channel done interrupt.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 294 of file dma_common.c.

References DMA_IEN, and DMA_IEN_CHxDONE.

◆ dma_enable_loop()

void dma_enable_loop ( enum dma_ch  ch)

Enable channel loop.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 372 of file dma_common.c.

References CHANNEL_SUPPORT_LOOP, DMA_LOOP_EN, and DMA_LOOPx.

◆ dma_enable_periph_request()

void dma_enable_periph_request ( enum dma_ch  ch)

Enable channel peripherial request.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 120 of file dma_common.c.

References DMA_CHREQMASKC, and DMA_CHREQMASKC_CHxSREQMASKC.

◆ dma_enable_priority()

void dma_enable_priority ( enum dma_ch  ch)

Enable channel high priority.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 174 of file dma_common.c.

References DMA_CHPRIS, and DMA_CHPRIS_CHxSPRIC.

◆ dma_enable_single_and_burst()

void dma_enable_single_and_burst ( enum dma_ch  ch)

Enable channel single and burst.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 111 of file dma_common.c.

References DMA_CHUSEBURSTC, and DMA_CHUSEBURSTC_CHxSUSEBURSTC.

◆ dma_enable_with_privileged_access()

void dma_enable_with_privileged_access ( void  )

Enable DMA with privileged access.

See also
dma_enable_with_unprivileged_access()

Definition at line 33 of file dma_common.c.

References DMA_CONFIG, DMA_CONFIG_CHPROT, and DMA_CONFIG_EN.

◆ dma_enable_with_unprivileged_access()

void dma_enable_with_unprivileged_access ( void  )

Enable DMA with un-privileged access.

See also
dma_enable_with_privileged_access()

Definition at line 42 of file dma_common.c.

References DMA_CONFIG, and DMA_CONFIG_EN.

Referenced by dma_enable().

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◆ dma_generate_software_request()

void dma_generate_software_request ( enum dma_ch  ch)

Generate a software request on channel.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 93 of file dma_common.c.

References DMA_CHSWREQ, and DMA_CHSWREQ_CHxSWREQ.

◆ dma_get_bus_error_flag()

bool dma_get_bus_error_flag ( void  )

Get bus error flag.

Return values
trueif flag is set
falseif flag is not set

Definition at line 193 of file dma_common.c.

References DMA_ERRORC, and DMA_ERRORC_ERRORC.

◆ dma_get_bus_error_interrupt_flag()

bool dma_get_bus_error_interrupt_flag ( void  )

Get bus error interrupt flag.

Return values
trueif flag is set
falseif flag is not set

Definition at line 223 of file dma_common.c.

References DMA_IF, and DMA_IF_ERR.

◆ dma_get_done_interrupt_flag()

bool dma_get_done_interrupt_flag ( enum dma_ch  ch)

Get channel done interrupt flag.

Parameters
[in]chChannel (use DMA_CHx)
Return values
trueif flag is set
falseif flag is not set

Definition at line 235 of file dma_common.c.

References DMA_IF, and DMA_IF_CHxDONE.

◆ dma_get_request_flag()

bool dma_get_request_flag ( enum dma_ch  ch)

Get channel request flag.

Parameters
[in]chChannel (use DMA_CHx)
Return values
trueif flag is set
falseif flag is not set

Definition at line 212 of file dma_common.c.

References DMA_CHREQSTATUS, and DMA_CHREQSTATUS_CHxSREQSTATUS.

◆ dma_get_wait_on_request_flag()

bool dma_get_wait_on_request_flag ( enum dma_ch  ch)

Get channel wait on request status flag.

Return values
trueif flag is set
falseif flag is not set

Definition at line 83 of file dma_common.c.

References DMA_CHWAITSTATUS, and DMA_CHWAITSTATUS_CHxWAITSTATUS.

◆ dma_set_bus_error_interrupt_flag()

void dma_set_bus_error_interrupt_flag ( void  )

Set bus error interrupt flag.

Definition at line 243 of file dma_common.c.

References DMA_IFS, and DMA_IFS_ERR.

◆ dma_set_desc_address()

void dma_set_desc_address ( uint32_t  desc_base)

Set channel's descriptor address.

Parameters
[in]desc_baseAddress of channel's descriptor address
Note
desc_base 8LSB's should be 0x00

Definition at line 69 of file dma_common.c.

References DMA_CTRLBASE.

◆ dma_set_done_interrupt_flag()

void dma_set_done_interrupt_flag ( enum dma_ch  ch)

Set channel done interrupt flag.

Parameters
[in]chChannel (use DMA_CHx)

Definition at line 252 of file dma_common.c.

References DMA_IFS, and DMA_IFS_CHxDONE.

◆ dma_set_loop_count()

void dma_set_loop_count ( enum dma_ch  ch,
uint16_t  count 
)

Set channel loop width to ( count + 1)

Parameters
[in]chChannel (use DMA_CHx)
[in]countCount
Note
count is expected to be equal to (n_minus_1 + 1)

Definition at line 358 of file dma_common.c.

References CHANNEL_SUPPORT_LOOP, DMA_LOOP_WIDTH, and DMA_LOOPx.

◆ dma_set_signal()

void dma_set_signal ( enum dma_ch  ch,
uint32_t  signal 
)

Set channel source signal.

Parameters
[in]chChannel (use DMA_CHx)
[in]signalSignal (use DMA_CH_CTRL_SIGSEL_*)

Definition at line 324 of file dma_common.c.

References DMA_CHx_CTRL.

◆ dma_set_source()

void dma_set_source ( enum dma_ch  ch,
uint32_t  source 
)

Set channel source.

Parameters
[in]chChannel (use DMA_CHx)
[in]sourceSource (use DMA_CH_CTRL_SOURCESEL_*)

Definition at line 313 of file dma_common.c.

References DMA_CHx_CTRL.