Cypress Semiconductor FX2LP Informacje Techniczne Pobierz pdf (Strona 187)

100

101

Chapter 9. Slave FIFOs Page 9-31

Figure 9-43. TD_Poll Example, AUTOIN=0, Editing a Packet via EPxBCH:L

9.3.9 Auto-In / Auto-Out Initialization

Enabling Auto-In transfers between slave FIFO and endpoint

Typically, a FIFO is configured for Auto-In mode as follows:

1. Configure bits IFCONFIG[7:4] to define the behavior of the interface clock.

2. Set bits IFCFG1:0=11.

3. Reset the FIFOs.

4. Set bit EPxFIFOCFG.3=1.

5. Set the size via the EPxAUTOINLENH:L registers.

Enabling Auto-Out transfers between endpoint and slave FIFO

Typically, a FIFO is configured for Auto-Out mode as follows:

1. Configure bits IFCONFIG[7:4] to define the behavior of the interface clock.

2. Set bits IFCFG1:0=11.

3. Reset the FIFOs.

4. Set bit EPxFIFOCFG.4=1.

TD_Poll():

… … … … …

if( master_finished_xfr( ) )

{ // modify the data

EP8FIFOBUF[ 0 ] = 0x02; // <STX>, packet start of text msg

EP8FIFOBUF[ 7 ] = 0x03; // <ETX>, packet end of text msg

SYNCDELAY;

EP8BCH = 0x00;

SYNCDELAY;

EP8BCL = 0x08; // pass buffer on to host

}

… … … … …

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 459 460

Komentarze do niniejszej Instrukcji

Brak uwag

Cypress Semiconductor FX2LP Informacje Techniczne Strona 187

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Networking Cypress Semiconductor FX2LP