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Discussion Groups | TMS320C54x | McBSP as GPIO
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).
McBSP as GPIO - lfouilhac - Sep 30 17:54:00 2002
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Hi all, I have configured the McBSP #1 as GPIO (RRST_ = 0 RIOEN = 1). When I read the voltage on that pin (the pin is not connected, working with 5509 EVM from Spectrum Digital), I read 0 but the DSP read a logical 1 If I link the pin to the ground, the DSP sees a 0. Looks like I need a Pull down. Here is my problem : what is the recommended value for the resistor? Thanks in advance Laurent |
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McBSP as GPIO - czarlee - Mar 31 4:06:00 2004
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Hi..... Im using TMS320VC5416 DSP and i want to use the McBSP as general purpose IO. I want to use one of the pin to control a modem and I choose to use pin DX. I followed the instructions in the spru302.pdf document but the Output pin value is not correct. The PIN that I check my Output value is Pin 7 of connector P3. Here is my program, could you please advise on what i did wrong. Thank you volatile int *McBSP0_SPSA=(volatile int *)0x0038; volatile int *McBSP0_SPSD=(volatile int *)0x0039; #define SPCR1 0x0000 // address SPCR1 #define SPCR2 0x0001 // address SPCR2 #define PCR 0x000E // address PCR #define N 7 void main() { int value=0; *McBSP0_SPSA = SPCR1; value = *McBSP0_SPSD; value = value & 0xFFFE; // value & 1111 1111 1111 1110 *McBSP0_SPSD = value; printf("\n SPCR1 value %x\n",value); *McBSP0_SPSA = SPCR2; value = *McBSP0_SPSD; value = value & 0xFFFE; // value & 1111 1111 1111 1110 *McBSP0_SPSD = value; printf("\n SPCR2 value %x\n",value); *McBSP0_SPSA = PCR; value = *McBSP0_SPSD; value = value | 0x3020; // value | 0011 0000 0010 0000 //value = value | 0x3000; *McBSP0_SPSD = value; printf("\n PCR value %x\n",value); } Sazali Senawi, DSP Lab, UTM. ________________________________________________________________________ Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now http://uk.messenger.yahoo.com/download/index.html |
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