UM0290 datasheet(13/76 Pages) STMICROELECTRONICS

13 / 76 page

UM0290

STR7/STR9 USB firmware library

13/76

chains) before enabling the DMA and, on termination of the DMA transfer (terminal

count interrupt from the DMAC).

–

IN Endpoint:

void DMALinkedModeTxConfig(u8 bEpNum): Configure a IN endpoint to

trigger DMA Tx linked mode request.

bEpNum = Endpoint number: 0 to 9.

void DMALinkedModeTxEnable(void): Enable a IN endpoint to trigger

DMA Tx linked

mode.

void DMALinkedModeTxDisable(void): Disable the trigger Tx DMA

Linked request for the IN Endpoint.

void SetDMALLITxLength(u8 length): set the DMA linked list length

for IN Endpoint.

length = length of the linked list. This value can be up to 255.

–

OUT Endpoint:

void DMALinkedModeRxConfig(u8 bEpNum): Configure a OUT endpoint to

trigger DMA Rx linked mode request.

bEpNum = Endpoint number: 0 to 9.

void DMALinkedModeRxEnable(void):Enable a OUT endpoint to trigger

DMA Rx linked

mode.

void DMALinkedModeRxDisable(void):Disable the trigger Rx DMA Linked

request for the OUT Endpoint.

void SetDMALLIRxLength(u8 length):set the DMA linked list length

for OUT Endpoint.

length = length of the linked list. This value can be up to 255.

void SetDMALLIRxPacketNum(u8 PacketNum): Set the number of packets

to be received for each single descriptor of the Linked List.

PacketNum = number of packet. It can be up to 127 packets.

u8 GetDMALLIRxPacketNum(void): Get the number of packets to be

received for each single descriptor of the Linked List.

DMA common functions:

To configure the DMA in both unlinked and linked modes the USB library provides

some common functions used to synchronize the USB and the DMAC IPs and to

configure the burst size for IN or OUT endpoints.

void SetDMABurstTxSize(u8 DestBsize): Set the burst size for IN

endpoint (destination burst size)

DestBsize = Destination burst size.

void SetDMABurstRxSize(u8 SrcBsize):Set the burst size for OUT

endpoint (source burst size)

SrcBsize = Source burst size.

void DMASynchEnable(void): Enable the Synchronisation between the

DMAC and the USB IP.

void DMASynchDisable(void): Disable the Synchronisation between the

DMAC and the USB IP.

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