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[/] [socgen/] [trunk/] [Projects/] [opencores.org/] [Mos6502/] [sw/] [io_irq/] [io_irq.asm] - Rev 131

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  include ../io_module/io_module.asm









        * = $c000  ; assemble start
               code

                   jmp  .nmi_vec               ;
                   jmp  .irq_vec               ;        
.start             nop
                   ldx #00
                   ldy #00
                   lda io_base+io_gpio_0        
                   sec
                   adc #00
                   sta io_base+io_gpio_0
                   lda io_base+io_gpio_0        
                   sec
                   adc #00
                   sta io_base+io_gpio_0        


                   lda #$01
                                ;
                   sta io_base+io_pic_irq_en
        
                   lda #$04
                   sta io_base+io_pic_nmi_en
        


                   lda #$c0
                   sta io_base+io_uart_cnt      
                   lda #$42
                   sta io_base+io_uart_xmt  
                   cli          ; was cli
                   lda #$fe
                   sta io_base+io_tim0_start

                   ldx #$00
                   inx
                   inx
                   inx
                   inx
                   inx
                   inx
                   inx
                   inx
                   inx
                   inx
                   inx
                   inx 
                   inx
                   inx
                   inx
                   inx


.lab_80            lda $05
                   jmp .lab_80



        


.irq_vec           pha
                   txa
                   pha 
                   tya
                   pha
                   lda io_base+io_gpio_0        
                   sec
                   adc #00
                   sta io_base+io_gpio_0
                   lda #$fe
                   sta io_base+io_tim0_end      
                   sta io_base+io_tim0_start   
                   pla
                   tay
                   pla
                   tax 
                   pla
                   rti

.nmi_vec           pha
                   lda io_base+io_uart_rcv
                   sec
                   adc #01
                   sta io_base+io_uart_xmt
                   lda io_base+io_gpio_1        
                   sec
                   adc #00
                   sta io_base+io_gpio_1
                   pla
                   rti

        
             * = $c0fa         ; vectors
     dw .nmi_vec               ;
     dw .start                 ;
     dw .irq_vec               ;

 code
    





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