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| Software Overview |
nop |
| ; wait for some sampling time | ||||
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XF | = 1 | ; reset CSTART | ||||
repeat(#34) |
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nop |
| ; wait for 34 cycles until conversion has been finished | ||||
@TEMP = port(ADC) | ; read the sample but don’t care about the content | |||||
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IFR | = #1 | ; reset any old interrupt on pin INT0 | ||||
*********************************
*set back ADC register CR0/CR1
*********************************
*write CR1 (to reset old CSTART mode initialization, because otherwise, the ADC never sets
*back its int– pin to show a sample is available:
@CR_PROBLEM = #(SW_PWDNNO_AUTO_PWDNNO_2COMPLEMENTNO_DEBUGRES_10_BITRD_CONV_START);
port(ADC) = @CR_PROBLEM | ; Address decoder sets CS low, | ||||||
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| ; WR low and send CR_PROBLEM value to the ADC | ||||||
NOP | ; wait for tW(CSH)=50nS | ||||||
* write CR1: |
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port(ADC) = @CR1_SEND | ; Address decoder sets CS low, | ||||||
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| ; WR low and send CR1 value to the ADC | ||||||
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port(DEACTIVE) = @ZERO | ; deselect ADC (CS high) | ||||||
NOP | ; wait for tW(CSH)=50ns | ||||||
* write CR0 |
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port(ADC) = @CR0_SEND | ; send CR0 value to the ADC | ||||||
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port(DEACTIVE) = @ZERO | ; deselect ADC (CS high) | ||||||
NOP | ; wait for tW(CSH)=50ns | ||||||
return | ; return from call | ||||||
.endif |
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.endif |
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Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP | 57 |
