2008-10-20 10:34:29 bfin_sport and continuous write/read?

N.C. van Leeuwen (NETHERLANDS)

Message: 63950

Is it possible to configure the sport (using bfin_sport character device driver) to use continuous read and write operations while the TFS/RFS remains active?

I've tried several things but none of them work. Telling the driver to use unframed messages gives me more then one byte, but the TFS is only active during the first byte. Telling the driver to use framed messages gives me just one byte, altough I gave as parameters for the write operation for example: write(sport, BufPtr, 2). With the intention to write 2 words.

I've read the hardware reference manual of the BF-537. I use the BF-537 stamp.

On page 12-31 of that manual there is mentioned that when TFSR = 1 or RFSR = 1, a frame

sync signal is required for every data word (size 8 in my case). To allow continuous transmitting (TFS remains active) each new dataword must be loaded into the SPORT_TX hold register before the previous word is shifted out and transmitted.

Is this implemented in the driver, and if it is, how can I use it?

My config so far:

mode = NORM_MODE

lsb_first = 0

data_indep = 0

fsync = 1

act_low = 1

late_fsync = 1

tckfe = 0

sec_en = 0

int_clk = 1

serial_clk = 2000000