Cypress Semiconductor FX2LP Technické informace stáhnout pdf (Strana 247)

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Chapter 10. General Programmable Interface (GPIF) Page 10-57

10.4.9 Firmware access to OUT packets, (AUTOOUT = 0)

Figure 10-48. Firmware can Skip or Commit, AUTOOUT = 0

Figure 10-49. Initialization Code for AUTOOUT = 0

In manual OUT mode (AUTOOUT = 0), the firmware has the following options:

1. It can commit (“pass-on”) packet(s) sent from the host to the master when a buffer is available,

by writing the OUTPKTEND register with the SKIP bit (OUTPKTEND.7) cleared to 0 (see

Figure 10-50).

Figure 10-50. Committing an OUT Packet by Writing OUTPKTEND w/SKIP=0

TD_Init():

… … … … …

EP2CFG = 0xA2; // EP2 is DIR=OUT, TYPE=BULK, SIZE=512, BUF=2x

SYNCDELAY;

EP2FIFOCFG = 0x00; // EP2 is AUTOOUT=0, AUTOIN=0, ZEROLEN=0, WORDWIDE=0

SYNCDELAY;

// OUT endpoints do NOT come up armed

EP2BCL = 0x80; // arm first buffer by writing BC w/skip=1

SYNCDELAY;

EP2BCL = 0x80; // arm second buffer by writing BC w/skip=1

… … … … …

TD_Poll():

… … … … …

if( !( EP24FIFOFLGS & 0x02 ) )

{ // EP2EF=0 when FIFO “not” empty, host sent pkt.

OUTPKTEND = 0x02; // SKIP=0, pass buffer on to master

}

… … … … …

Data

8051

USB

Host Peripheral

AUTOOUT=0

skip=0

skip=1

Slave GPIF

1 2 ... 242 243 244 245 246 247 248 249 250 251 252 ... 459 460

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