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#include "hardware.h"
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#include "hardware.h"
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;variables
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;variables
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.data
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.data
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.comm rxdata,1,1 ;char var
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; .comm rxdata,1,1 ;char var
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.comm rxshift,1,1 ;char var
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.comm rxshift,1,1 ;char var
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.comm rxbit,2,2 ;short var, aligned
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.comm rxbit,2,2 ;short var, aligned
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.text
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.text
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vector_0x0012:
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;interrupt(TIMERA0_VECTOR) ;register interrupt vector
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;interrupt(TIMERA0_VECTOR) ;register interrupt vector
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;interrupt handler to receive as Timer_A UART
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;interrupt handler to receive as Timer_A UART
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.global ccr0 ;place a label afterwards so
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.global ccr0 ;place a label afterwards so
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ccr0: ;that it is used in the listing
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ccr0: ;that it is used in the listing
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add &rxbit, r0
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add &rxbit, r0
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.Lrxlastbit: ;last bit, handle byte
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.Lrxlastbit: ;last bit, handle byte
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bit #SCCI, &CCTL0 ;read last bit
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bit #SCCI, &CCTL0 ;read last bit
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rrc.b &rxshift ;and save it
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rrc.b &rxshift ;and save it
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clr &rxbit ;reset state
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clr &rxbit ;reset state
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mov #CCIE|CAP|CM_2|CCIS_1|SCS, &CCTL0 ;restore capture mode
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mov #CCIE|CAP|CM_2|CCIS_1|SCS, &CCTL0 ;restore capture mode
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mov.b &rxshift, &rxdata ;copy received data
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; mov.b &rxshift, &rxdata ;copy received data
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bic #CPUOFF|OSCOFF|SCG0|SCG1, 0(r1) ;exit all lowpower modes
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; bic #CPUOFF|OSCOFF|SCG0|SCG1, 0(r1) ;exit all lowpower modes
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;here you might do other things too, like setting a flag
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;here you might do other things too, like setting a flag
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;that the wakeup comes from the Timer_A UART. however
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;that the wakeup comes from the Timer_A UART. however
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;it should not take longer than one bit time, otherwise
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;it should not take longer than one bit time, otherwise
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;charcetrs will be lost.
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;charcetrs will be lost.
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reti
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; reti
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mov.b &rxshift, r15 ;return received data
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ret
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.Lrxstart: ;startbit, init
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.Lrxstart: ;startbit, init
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clr &rxshift ;clear input buffer
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clr &rxshift ;clear input buffer
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add #(BAUD/2), &CCR0 ;startbit + 1.5 bits -> first bit
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add #(BAUD/2), &CCR0 ;startbit + 1.5 bits -> first bit
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mov #CCIE|CCIS_1|SCS, &CCTL0;set compare mode, sample bits
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mov #CCIE|CCIS_1|SCS, &CCTL0;set compare mode, sample bits
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bit #SCCI, &CCTL0 ;measure databit
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bit #SCCI, &CCTL0 ;measure databit
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rrc.b &rxshift ;rotate in databit
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rrc.b &rxshift ;rotate in databit
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.Lrxex: add #BAUD, &CCR0 ;one bit delay
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.Lrxex: add #BAUD, &CCR0 ;one bit delay
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incd &rxbit ;setup next state
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incd &rxbit ;setup next state
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reti
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; reti
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mov #0xffff, r15 ;return 0xffff
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ret
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; void serPutc(char)
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; void serPutc(char)
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;use an other Capture/Compare than for receiving (full duplex).
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;use an other Capture/Compare than for receiving (full duplex).
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;this one is without interrupts and OUTMOD, because only
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;this one is without interrupts and OUTMOD, because only
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;this way P1.1 can be used. P1.1 is prefered because the
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;this way P1.1 can be used. P1.1 is prefered because the
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