Hi,
I am trying to read the HPIC register on the 6713 (dsk board). \
Here is what I am doing on the host side:
1. Setting HCNTL1:0 to 00; HRW' to 1 (read); HHWIL to 0 (1st read)
2. HCS' goes low and stays that way for both reads
2. HDS1' Tied High, HDS2' used as strobe
I am reading off an 8 bit port on the host, as only the bottom 4 bits of the HPIC register are relevant.
My scope shows HRDY going High when HDS2' goes high, and HHWIL = 1( for the second read )
Scope values for the HD0:7 pins shows values 0xEF; which is the same value the pins have when unconnected at startup
CCS shows HPIC = 0x00000008.
Does not the HPIC register value get sent to the HD pins?
Also, HRDY' going high after rising edge of HDS2' (strobe) is exactly the opposite of the waveform in Figure 7, case 2 of the HPI user's guide.
Anybody have any suggestions?
Thanks,
Mike J.