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Hello, I am trying to connect up a BF533 (EZ_KIT) to an image sensor. The digital image sensor has two sync signals, HSYNC and VSYNC. My problem is this: when I try to configure the PPI_CONTROL register for two external syncs nothing happens, i.e it dosent work. It works with one sync signal. For example with PPI_CONTROL: (PORT_CFG, XFR_TYPE, POL=0, DLEN=8 bits, PORT_DIR=0, FLD_SEL=0) then data is received into the PPI through DMA correctly.However when I try to use two syncs, or even three with PFS3 tied to ground, i.e PORT_CFG = 01, 10, no information is recieved into the PPI. Is there some anomaly with the PPI_CONTROL register which hasnt been noted by ADI, or do the actuall sync signals arriving at the DSP pins have to be in a special format (HIGH-to-LOW, LOW-to-HIGH), or need special timing requirments. I hope I have explained my problem well enough for anyone who reads this to understand it, and I would appreciate anyones help with this matter, regards Stephen. __________________________________ |
BF533, PPI_CONTROL errors
Started by ●September 1, 2004
Reply by ●March 4, 20052005-03-04
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Hello, Could you told me how you do with one sync signal, because i have to make this for a dsp bf533 stamp, and i try some program but i have some problem. Regards. Mike. > Hello, > >I am trying to connect up a BF533 (EZ_KIT) to an image >sensor. The digital image sensor has two sync signals, >HSYNC and VSYNC. My problem is this: > >when I try to configure the PPI_CONTROL register for >two external syncs nothing happens, i.e it dosent >work. It works with one sync signal. For example with > >PPI_CONTROL: (PORT_CFG, XFR_TYPE, POL=0, >DLEN=8 bits, PORT_DIR=0, FLD_SEL=0) > >then data is received into the PPI through DMA >correctly.However when I try to use two syncs, or even >three with PFS3 tied to ground, i.e PORT_CFG = 01, 10, >no information is recieved into the PPI. > >Is there some anomaly with the PPI_CONTROL register >which hasnt been noted by ADI, or do the actuall sync >signals arriving at the DSP pins have to be in a >special format (HIGH-to-LOW, LOW-to-HIGH), or need >special timing requirments. > >I hope I have explained my problem well enough for >anyone who reads this to understand it, and I would >appreciate anyones help with this matter, > >regards > >Stephen. > >__________________________________ |
