Hello, Mariana:
There is a problem in the same category with McBSP of Experimenter board of OMAP-L138/TMS320C6748.
The FSR1 and FSR0 (Receive frame synchronization) signals don't work. The FSR1 signal can be brought
out through the GP0[4] pin of the general I/O Port under the control of register PINMUX1, according to
document SPRUGJ6A.pdf, User's Guide of TMS320C674x/OMAP-L1x Processor McBSP Interface. But the
FSR0 and FSR1 signals can not be brought out. To verify this problem, I first let PINMUX1 = 0x00808080 and
send a logic-one signal (3.3V DC) to GP0[4]. But this GP0[4] pin does not output 3.3V DC when I measure it
with my multimeter (volt/ohm meter), its output is always a constant 0.145V DC. But the pins of GP0[2] and
GP[6] can output 3.3V DC correctly. This makes me suspect that there may be some silicon error with FRS0
and FSR1 inside DSP OMAP-L138/TMS320C6748.
Could you please send a logic-one signal to the GP0[4] pin and see if you are able to measure 3.3V DC
at this pin out?
I need to change my DSP from OMAP-L138/TMS320C6748 to OMAP-L137/TMS320C6747 if this is indeed
a silicon problem of the DSP chip. I need the McBSP to interface a 4-channel sigma-delta ADC (TI's ADS1274).
But, OMAP-L137/MTS320C6747 only has McASP but not McBSP. Is it possible to interface ADS1274 with McASP
of OMAP-L137/MTS320C6747?
Thank you in advance.
WL
