Subversion Repositories copyblaze

; project       : copyBlaze 8 bit processor
; file name     : wb_uart.asm
; author        : abdAllah Meziti
; licence       : LGPL

; this programm test the wishbone copyBlaze instruction.
; it use this module : 
;                       wb_uart_08.vhd

                WB_UART_STATUS          .EQU    0x00
                WB_UART_DIV_LOW         .EQU    0x04
                WB_UART_DIV_HIGH        .EQU    0x05
                WB_UART_DATA            .EQU    0x08
                
                wb_data_to_wb           .EQU   s0
                wb_data_from_wb         .EQU   s1
                ;

                ; ==========================================================
start:
                ; ==========================================================

                ; initialize the wb_uart registers
                LOAD            wb_data_to_wb,          0x02                            ; 
                WBWRSING        wb_data_to_wb,          WB_UART_DIV_LOW         ; DIV_LOW = 0x02

                LOAD            wb_data_to_wb,          0x00                            ; 
                WBWRSING        wb_data_to_wb,          WB_UART_DIV_HIGH        ; DIV_HIGH = 0x00

;               LOAD            wb_data_to_wb,          0x04                            ; 
;               WBWRSING        wb_data_to_wb,          WB_UART_STATUS          ; STATUS = 0x04 : rx_irqen=1
                
                LOAD            wb_data_to_wb,          0x08                            ; 
                WBWRSING        wb_data_to_wb,          WB_UART_STATUS          ; STATUS = 0x08 : tx_irqen=1
                
                ; write a data to the UART
                LOAD            wb_data_to_wb,          0x55                            ; 
                WBWRSING        wb_data_to_wb,          WB_UART_DATA            ;
                
                ; enable interrupts
                EINT
end:            
                JUMP    end
                ;

;       *************************
;       Interrupt Service Routine
;       *************************
ISR:
                WBRDSING        wb_data_from_wb,        WB_UART_STATUS          ; read the status
                
                ADD                     wb_data_to_wb,          0x01
                
                WBWRSING        wb_data_to_wb,          WB_UART_DATA            ;
                
                
                RETI      ENABLE
;               RETI      DISABLE
;       *************************
;       End ISR Interrupt Handler
;       *************************

                .ORG    0x3FF
VECTOR:
                JUMP    ISR