Hi everyone! I'm a newcomer on using TI DSP. Now I'm working on a
project that uses Tms320c6713 as argrithom computing unit, one ADC for acquiring
signals, two DAC for outputing DSP's results. The ADC and DACs are on one
piece of circuit we designed. Tms320c6713 collets data from ADC and sends data
to DAC all through EMIF interface. EMIF is mapped into CE2 space and it is
configued 16-bit asynchronous interface.
We 've configured two Mcbsps as GPIOs to send out ADC and DAC's
control signals, the control signals meet our demands. They can be high or low
level where we need.
Because I am not familiar with DSP, when we designed our circuit board,
EMIF's CEn. AWE.ARE pins are all not conneted. So my first quesiton is: can
our design work? These EMIF's three pins MUST be conneted? I'm not
sure about it.
Today when I debug DAC ( 12 bit), I use this method:
Firstly, write 0x100 16-bit data( each value is 0x0FFF) in program. These data
are in L2 RAM.
Secondly, send these data to DAC through EMIF in CE2 space, the first address is
0xA0000000. Because DAC is 12-bit, the LSB 12 bit is only needed. If DAC is
disconneted to DSP, I can observe 12 high leves about 3V using scope.
Thirdly, running program to send out signlas to control DAC. Unfornately, when
control signals and data are sent out, I watch memory in address 0xA0000000, the
values are all 0x06600660. It's so strange!! The right values should be
0x0FFF0FFF. So the second question is : where does the wrong value come from? Is
it related to EMIF's /AWE and /CEn pin?
I hope anyone can shed some light on this or point me in the right direction
todebug this problem.
With kind regards,
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=?x-unknown?B?Q2Fu4oCZdA==?= get right data when using 6713 interface with DAC
Started by ●July 23, 2009
