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comparison src/i2c.asm @ 467:6ca155fc1509

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battery gauge handling
author heinrichsweikamp
date Sun, 20 Nov 2016 12:54:36 +0100
parents 7f4c3b2e6bb7
children e8351dd7bb90
comparison
equal deleted inserted replaced
466:7f4c3b2e6bb7 467:6ca155fc1509
640 640
641 global lt2942_init 641 global lt2942_init
642 lt2942_init: ; Setup Control register B 642 lt2942_init: ; Setup Control register B
643 clrf i2c_temp 643 clrf i2c_temp
644 movlw 0x01 ; Point to control reg B 644 movlw 0x01 ; Point to control reg B
645 call I2C_TX_GAUGE 645 rcall I2C_TX_GAUGE
646 movlw b'11111000' ; Automatic conversion every two seconds 646 movlw b'11111000' ; Automatic conversion every two seconds
647 movff WREG, SSP1BUF ; Data Byte 647 movff WREG, SSP1BUF ; Data Byte
648 rcall WaitMSSP 648 rcall WaitMSSP
649 rcall I2C_WaitforACK 649 rcall I2C_WaitforACK
650 bsf SSP1CON2,PEN ; Stop condition 650 bsf SSP1CON2,PEN ; Stop condition
651 rcall WaitMSSP 651 bra WaitMSSP ; (And return)
652 return
653 652
654 global lt2942_get_status 653 global lt2942_get_status
655 lt2942_get_status: ; Read status register 654 lt2942_get_status: ; Read status register
656 bcf battery_gauge_available ; Clear flag 655 bcf battery_gauge_available ; Clear flag
657 clrf i2c_temp 656 clrf i2c_temp
658 movlw 0x00 ; Point to Status reg 657 movlw 0x00 ; Point to Status reg
659 call I2C_TX_GAUGE 658 rcall I2C_TX_GAUGE
660 call I2C_RX_GAUGE 659 rcall I2C_RX_GAUGE
661 movff SSP1BUF,WREG 660 movff SSP1BUF,WREG
662 btfss WREG,7 ; 2942 found? 661 btfss WREG,7 ; 2942 found?
663 bsf battery_gauge_available ; Yes, set flag 662 bsf battery_gauge_available ; Yes, set flag
664 bsf SSP1CON2,PEN ; Stop condition 663 bsf SSP1CON2,PEN ; Stop condition
665 rcall WaitMSSP 664 bra WaitMSSP ; (And return)
666 return
667 665
668 666
669 global lt2942_get_voltage 667 global lt2942_get_voltage
670 lt2942_get_voltage: ; Read battery voltage registers 668 lt2942_get_voltage: ; Read battery voltage registers
671 clrf i2c_temp 669 clrf i2c_temp
761 759
762 global lt2942_get_accumulated_charge 760 global lt2942_get_accumulated_charge
763 lt2942_get_accumulated_charge: ; Read accumulated charge and compute percent 761 lt2942_get_accumulated_charge: ; Read accumulated charge and compute percent
764 clrf i2c_temp 762 clrf i2c_temp
765 movlw 0x00 ; Point to status register 763 movlw 0x00 ; Point to status register
766 call I2C_TX_GAUGE 764 rcall I2C_TX_GAUGE
767 call I2C_RX_GAUGE 765 rcall I2C_RX_GAUGE
768 bsf SSP1CON2,ACKEN ; Master acknowlegde 766 bsf SSP1CON2,ACKEN ; Master acknowlegde
769 rcall WaitMSSP 767 rcall WaitMSSP
770 movff SSP1BUF,gauge_status_byte 768 movff SSP1BUF,gauge_status_byte
771 769
772 bsf SSP1CON2, RCEN ; Enable recieve mode 770 bsf SSP1CON2, RCEN ; Enable recieve mode
773 rcall WaitMSSP ; Dummy read (Control byte) 771 rcall WaitMSSP ; Dummy read (Control byte)
772 movf SSP1BUF,W
773 bsf SSP1CON2,ACKEN ; Master acknowlegde
774 rcall WaitMSSP
774 775
775 bsf SSP1CON2, RCEN ; Enable recieve mode 776 bsf SSP1CON2, RCEN ; Enable recieve mode
776 rcall WaitMSSP 777 rcall WaitMSSP
777 movff SSP1BUF,sub_a+1 778 movff SSP1BUF,sub_a+1
779 bsf SSP1CON2,ACKEN ; Master acknowlegde
780 rcall WaitMSSP
778 781
779 bsf SSP1CON2, RCEN ; Enable recieve mode 782 bsf SSP1CON2, RCEN ; Enable recieve mode
780 rcall WaitMSSP 783 rcall WaitMSSP
781 movff SSP1BUF,sub_a+0 784 movff SSP1BUF,sub_a+0
782 bsf SSP1CON2,PEN ; Stop condition 785 bsf SSP1CON2,PEN ; Stop condition
852 rcall WaitMSSP 855 rcall WaitMSSP
853 movlw b'11001001' ; Address byte + Read bit 856 movlw b'11001001' ; Address byte + Read bit
854 movwf SSP1BUF ; control byte 857 movwf SSP1BUF ; control byte
855 rcall WaitMSSP 858 rcall WaitMSSP
856 rcall I2C_WaitforACK 859 rcall I2C_WaitforACK
857 bsf SSP1CON2, RCEN ; Enable recieve mode 860 bsf SSP1CON2, RCEN ; Enable recieve mode
858 bra WaitMSSP; (and return) 861 bra WaitMSSP; (and return)
859 862
860 END 863 END