Software Overview
CR0_SEND | .usect ”.variabl”, 1 | ; the last value, sent to register CR0 | |||||||||||
CR1_SEND | .usect ”.variabl”, 1 | ; the last value, sent to register CR1 | |||||||||||
CR_PROBLEM .usect ”.variabl”, 1 | ; problem with initialization of this mode | ||||||||||||
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| when repeated (reset) | ||||||||
ZERO | .usect ”.variabl”, 1 | ; the value zero to send | |||||||||||
TEMP | .usect ”.variabl”, 1 | ; temporary variable | |||||||||||
isr_save | .usect ”.variabl”, 1 | ; memory location to save AR7 during | |||||||||||
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CH1_ADSAMPLE | .usect ”.variabl”,1 | ; last read sample of channel 1 | |||||||||||
CH2_ADSAMPLE | .usect ”.variabl”,1 | ; last read sample of channel 2 | |||||||||||
* Address Decoder constants: |
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ADC | .set | 00002h | ; activate A0 when TLV1562 is choosen | ||||||||||
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CSTART | .set 00001h | ; activate A1 when CSTART is choosen | |||||||||||
DAC1 | .set | 00003h | ; activate A2 when DAC1 is choosen | ||||||||||
DEACTIVE | .set | 00000h | ; deactivate the address lines A0, A1 and A2 | ||||||||||
* set timing mode (use od IRQ, or timer) | |||||||||||||
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POLLING_DRV | .set | 00001h | ; software polls the INT0 pin to wait, until | ||||||||||
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INT0_DRIVEN | .set | 00000h | ; software uses Interrupt INT0 to wait for end of | ||||||||||
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NO_INT0_SIG | .set | 00000h | ; INT0 signal not in use, timing solution | ||||||||||
SAVE_INTO_MEMORY.set 00001h | ; store the samples into DSP memory | ||||||||||||
SEND_OUT_SERIAL .set | 00000h | ; store the last sample allways into serial buffer memory | |||||||||||
SEND_OUT_PARALLEL.set 00001h | ; store the last sample allways into DAC1 | ||||||||||||
R10BIT_RESOLUT .set | 00001h | ; use maximum resolution of 10 bit | |||||||||||
R8BIT_RESOLUT .set 00000h | ; use 8 Bit resolution | ||||||||||||
R4BIT_RESOLUT .set 00000h | ; use fastest mode (4 Bit resolution) | ||||||||||||
INTERNAL_CLOCK .set | 00001h | ; use the internal clock of the ADC | |||||||||||
EXTERNAL_CLOCK .set | 00000h | ; use the external clock of the ADC | |||||||||||
AUTO_PWDN_ENABLE.set 00000h | ; ADC goes into power reduced state after conversion | ||||||||||||
DIFF_INPUT_MODE .set | 00000h | ; use differential mode instead of single ended inputs | |||||||||||
IME_CALIBRATION .set | 00000h | ; do an Internal Midscale Error Calibration | |||||||||||
SME_CALIBRATION .set | 00000h | ; do a System Midscale Error Calibration | |||||||||||
.sect ”.text” |
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_MAIN:
START:
INITIALIZATION:
* disable IRQ, sign extension mode, ini Stack
Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP | 67 |
