Problems using HPI8 port as general purpose I/O | TMS320C54x

Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).

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Hello. I have a problem using the HPI8 port as GPIO in the c5409 DSP. With the Spectrum Digital EVB sd5409 I had no problems using this port. When I made my board, with a microcontroller connected to this port, I'm not able to write anything, and the logic level of this 8 bit I/O port is low. The pin configuration is: CLKOUT, R/W#, MSTRB#, MSC#, HOLD#, HOLDA#, IAQ# left open MP/MC# and HPIENA tied low HCNTL0, HCNTL1, HBIL, HCS#, HDS1, HDS2#, HAS#, HR/W#, HRDY, HINT#, HPI16 left open When used as output, I set the GPIOCR as output (0x00ff) and put data to GPIOSR, but I don't see anything to this port, just 0. When used as input, I set the GPIOCR as input (0x0000) and read data to GPIOSR, but I don't see anything to this port, just 0. Where is the mistake? Somebody had the same problem, solved? Another strange thing is related to the pin MP/MC#: when tied to 0, I can dowload the SW via JTAG and run the program, whereas when MP/MC# = 1 I see many error messages such as "data verification failed at address 0x80" and other addresses, and the program is jammed. with the evaluation module the download I never had this kind of problem. Somebody else had the same behaviour? Thanks. Mario

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Problems using HPI8 port as general purpose I/O - zektronix - Jan 21 9:00:00 2003