Renesas Single-Chip Microcomputer M38C89T-ADF Manual do Utilizador descarregar pdf (Página 78)

Rev.1.00 May 22 2012

REJ09B0566

4-58

3BLibrary Reference

4.2.6 37BDMA Controller R_DMAC_Create

4.2.6. DMA Controller

Note: The current RPDL demo sample code does not include RPDL API for DMAC.

1) R_DMAC_Create

Synopsis

Configure the DMA controller.

Prototype bool R_DMAC_Create(

uint8_t data1, // Channel selection

uint32_t data2, // Configuration selection

uint32_t data3, // Configuration selection

uint16_t data4, // Trigger selection

void * data5, // Source start address

void * data6, // Destination start address

uint32_t data7, // Transfer byte count

void * data8, // Source reload address

void * data9, // Destination reload address

uint32_t data10, // Transfer byte count reload value

void * func, // Callback function

uint8_t data11

// Interrupt priority level

);

Description (1/3)

Set up a DMA channel.

[data1]

The channel number n (where n = 0 to 15).

[data2]

Configure the operation of channel DMAn.

If multiple selections are required, use “|” to separate each selection.

The default settings are shown in bold.

• Transfer system selection

PDL_DMAC_SINGLE_REQUEST or

PDL_DMAC_CONSECUTIVE_REQUEST

Single-operand,

consecutive-operand

• Transfer Bus Mode

PDL_DMAC_CYCLE_STEAL_MODE or

PDL_DMAC_BURST_MODE

Bus operates in cycle steal mode,

Bus operates in burst mode

• Address addition direction selection

PDL_DMAC_SOURCE_ADDRESS_FIXED or Leave the address unchanged.

PDL_DMAC_SOURCE_ADDRESS_PLUS or Increment the address by the data size.

PDL_DMAC_SOURCE_ADDRESS_MINUS or Decrement the address by the data size.

PDL_DMAC_DESTINATION_ADDRESS_FIXED or Leave the address unchanged.

PDL_DMAC_DESTINATION_ADDRESS_PLUS or Increment the address by the data size.

PDL_DMAC_DESTINATION_ADDRESS_MINUS or Decrement the address by the data size.

• Transfer data size

PDL_DMAC_SIZE_8 or

PDL_DMAC_SIZE_16 or

PDL_DMAC_SIZE_32 or

PDL_DMAC_SIZE_32

Select 8, 16, 32 or 64 bits for the data to be transferred.

• Half End Interrupt control

PDL_DMAC_HALF_END_INTERRUPT_DISABLE or

PDL_DMAC_HALF_END_INTERRUPT_ENABLE

Disable or enable generation of interrupt

on transfer of half of total data.

• end-of-transfer reload control

PDL_DMAC_SOURCE_ADDRESS_RELOAD_DISABLE or

PDL_DMAC_SOURCE_ADDRESS_RELOAD_ENABLE

Disable or enable reloading

of source address.

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