URL
https://opencores.org/ocsvn/open8_urisc/open8_urisc/trunk
Subversion Repositories open8_urisc
[/] [open8_urisc/] [trunk/] [taskmgr/] [sys_const.s] - Rev 321
Go to most recent revision | Compare with Previous | Blame | View Log
; Copyright (c)2022 Jeremy Seth Henry ; All rights reserved. ; ; Redistribution and use in source and binary forms, with or without ; modification, are permitted provided that the following conditions are met: ; * Redistributions of source code must retain the above copyright ; notice, this list of conditions and the following disclaimer. ; * Redistributions in binary form must reproduce the above copyright ; notice, this list of conditions and the following disclaimer in the ; documentation and/or other materials provided with the distribution, ; where applicable (as part of a user interface, debugging port, etc.) ; ; THIS SOFTWARE IS PROVIDED BY JEREMY SETH HENRY ``AS IS'' AND ANY ; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED ; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE ; DISCLAIMED. IN NO EVENT SHALL JEREMY SETH HENRY BE LIABLE FOR ANY ; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; ; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF ; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ; ;------------------------------------------------------------------------------ ; sys_const.s ; ; Common constants & macros for generic hardware or structures used by several ; tasks ; ; Revision History ; Author Date Change ;---------------- -------- --------------------------------------------------- ; Seth Henry 7/15/22 Initial Release ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ;-- Serial Port Constants & Macros ;------------------------------------------------------------------------------ .DEFINE UART_DATA 0 .DEFINE UART_STATUS 1 .DEFINE UART_RX_PERR 3 .DEFINE UART_RX_EMPTY 4 .DEFINE UART_RX_FULL 5 .DEFINE UART_TX_EMPTY 6 .DEFINE UART_TX_FULL 7 .DEFINE UART_RX_PERR_BIT 2^UART_RX_PERR .DEFINE UART_RX_PERR_MASK UART_RX_PERR_BIT ~ $FF .DEFINE UART_RX_EMPTY_BIT 2^UART_RX_EMPTY .DEFINE UART_RX_EMPTY_MASK UART_RX_EMPTY_BIT ~ $FF .DEFINE UART_RX_FULL_BIT 2^UART_RX_FULL .DEFINE UART_RX_FULL_MASK UART_RX_FULL_BIT ~ $FF .DEFINE UART_TX_EMPTY_BIT 2^UART_TX_EMPTY .DEFINE UART_TX_EMPTY_MASK UART_TX_EMPTY_BIT ~ $FF .DEFINE UART_TX_FULL_BIT 2^UART_TX_FULL .DEFINE UART_TX_FULL_MASK UART_TX_FULL_BIT ~ $FF ; Checking the UART flags involves testing bits in the status register ; The assembler isn't bright enough to use the defined constant, so this macro ; does the test on the correct bit .MACRO CHECK_UART_RX_PERR BTT 3 .ENDM .MACRO CHECK_UART_RX_EMPTY BTT 4 .ENDM .MACRO CHECK_UART_RX_FULL BTT 5 .ENDM .MACRO CHECK_UART_TX_EMPTY BTT 6 .ENDM .MACRO CHECK_UART_TX_FULL BTT 7 .ENDM ; Register Map: ; Offset Bitfield Description Read/Write ; 0x00 AAAAAAAA TX Data (WR) RX Data (RD) (RW) ; 0x01 EDCBA--- FIFO Status (RO*) ; A: RX Parity Error (write to clear) ; B: RX FIFO Empty ; C: RX FIFO almost full (922/1024) ; D: TX FIFO Empty ; E: TX FIFO almost full (922/1024) ; ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; Macros for setting the return value in Cmd_Error ;------------------------------------------------------------------------------ .DEFINE RX_CERR $FB .DEFINE RX_TERR $FC .DEFINE RX_LERR $FD .DEFINE RX_PERR $FE .DEFINE RX_OKAY $FF .MACRO RETURN_RX_CMD_OKAY LDI R0, #RX_OKAY .ENDM .MACRO RETURN_RX_CMD_ERROR LDI R0, #RX_CERR .ENDM .MACRO RETURN_RX_TIMEOUT_ERROR LDI R0, #RX_TERR .ENDM .MACRO RETURN_RX_LENGTH_ERROR LDI R0, #RX_LERR .ENDM .MACRO RETURN_RX_PARITY_ERROR LDI R0, #RX_PERR .ENDM ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; Common buffer/memory copy ; Uses R3:R2 as source, R5:R4 as destination, and R1 as the counter variable ;------------------------------------------------------------------------------ .MACRO MEM_COPY __MEM_CP_LP\@:LDX R2++ STX R4++ DBNZ R1, __MEM_CP_LP\@ .ENDM ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; Common buffer/memory fill/flush ; Uses R5:R4 as destination, and R1 as the counter variable ;------------------------------------------------------------------------------ .MACRO MEM_FILL __MEM_FL_LP\@:STX R4++ DBNZ R1, __MEM_FL_LP\@ .ENDM .MACRO MEM_FLUSH CLR R0 MEM_FILL .ENDM ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; Compute 16-bit Checksum ; ; Uses R3:R2 as source, R5:R4 as destination, and R1 as the counter variable ; Adds all of the memory locations specified to a 16-bit accumulator, returning ; the result in R5:R4 (destination) ;------------------------------------------------------------------------------ .MACRO CALC_CHECKSUM16 CLR R0 T0X R4 ; Initialize accumulator R5:R0 to 0 T0X R5 T0X R7 ; Initialize R7 to 0 __CHK_SM_LP\@:LDX R2++ ADD R4 T0X R4 TX0 R5 ADC R7 T0X R5 DBNZ R1, __CHK_SM_LP\@ .ENDM ; These macros assume that the pointer in R3:R2 has been left pointing to the ; end of the receive buffer by the CALC_CHECKSUM16 macro. Do NOT repoint ; R3:R2, and be sure to use these macros in the order that the checksum bytes ; appear in the packet. (THESE ARE ORDER DEPENDENT) .MACRO CHECK_SUM_LB LDX R2++ XOR R4 .ENDM .MACRO CHECK_SUM_UB LDX R2++ XOR R5 .ENDM ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; Convert ASCII to HEX ; ; Converts an ASCII value into an integer value from 0x0 to 0xF ; Assumes incoming data is in R0. Returns a value in R0 ; Returns a value of 0x00 to 0x0F for valid characters, or ; 0xFF (-1) for invalid characters ;------------------------------------------------------------------------------ .MACRO CONVERT_ASC2HEX PSH R1 ; Preserve R1 and R2 PSH R2 T0X R2 ; Make a copy of R0 to R2 for backup LDI R1, #$F0 ; Mask off the lower bits to figure out the range AND R1 T0X R1 ; Copy the upper 4-bits to R1 for branching tests LDI R0, #$30 ; Is it a decimal char 0-9? XOR R1 BRZ _CNV_AH_09_\@ LDI R0, #$40 ; Is it a hex char A-F? XOR R1 BRZ _CNV_AH_AF_\@ LDI R0, #$60 ; Is it a hex char a-f? XOR R1 BRZ _CNV_AH_AF_\@ BNI _CNV_AH_NV_\@ ; Valid HEX characters 0-9 are ASCII codes 0x30 to 0x39. Codes 0x3A to 0x3F are ; invalid, so check that the value in R0 is LESS than $3A. _CNV_AH_09_\@:TX0 R2 ; Restore R0 from backup LDI R1, #$0F ; Mask off the upper bits to check validity AND R1 T0X R2 ; Backup the lower 4-bits to R2 ; Check for 0x0A to 0x0F LDI R1, #$0A ; Load R1 with 0x0A (:) CMP R1 ; Compare R0 to R1 BNN _CNV_AH_NV_\@ ; Branch if not negative (R0 > 9) TX0 R2 ; Restore the lower 4-bits to R0 BNI _CNV_AH_EX_\@ ; Valid HEX characters A-F are 0x41 to 0x46 OR 0x61 to $66. The upper 4-bits ; have already been checked, so just verify that the lower 4-bits are between ; 0x01 and 0x06. 0x00 and 0x07 to 0x0F are invalid, ; so check that the value in R0 is LESS than $3A _CNV_AH_AF_\@:TX0 R2 ; Restore R0 from backup LDI R1, #$0F ; Mask off the upper bits to check validity AND R1 T0X R2 ; Backup the lower 4-bits to R2 ; Check for 0x00 BRZ _CNV_AH_NV_\@ ; 0x0 is an invalid code ; Check for 0x07 to 0x0F LDI R1, #$07 ; Load R1 with 0x7 (G or g) CMP R1 ; Compare R0 to R1 BNN _CNV_AH_NV_\@ ; Branch of not negative (R0 > 6) ; If this is a valid character, add 9 to the lower 4-bits for the result ; (0x01 to 0x06 -> 0x0A to 0x0F) TX0 R2 ; Restore lower 4-bits to R0 LDI R1, #$09 ; Load R1 with 0x9 ADD R1 ; Added 9 to R0 to convert to A-F BNI _CNV_AH_EX_\@ _CNV_AH_NV_\@:LDI R0, #$FF ; Return 0xFF on an invalid character _CNV_AH_EX_\@:POP R2 ; Restore R1 and R2 POP R1 .ENDM ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; Convert the lower nibble of R0 into a valid ASCII character ; Accepts data in R0 and returns the ASCII code in R0 ;------------------------------------------------------------------------------ .MACRO CONVERT_NIB2ASC PSH R1 ; Preserve R1 LDI R1, #$0F ; Mask away the upper 4-bits AND R1 T0X R1 ; Copy to R1 LDI R0, #$09 ; Load R0 with 0x09 CMP R1 ; Compare R0 to R1 BNN _CNV_NA_09_\@ ; Fall into _MC_FM_CHA_AF _CNV_NA_AF_\@:LDI R0, #$37 ; Add 0x37 to the nibble to get the ASCII value ADD R1 BNI _CNV_NA_EX_\@ _CNV_NA_09_\@:LDI R0, #$30 ; Add 0x30 to the nibble to get the ASCII value OR R1 ; Fall into _MC_FM_CHA_EX _CNV_NA_EX_\@:POP R1 .ENDM ;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------ ; Convert the packed BCD value in R0 to its ASCII equivalent in R3:R2 ; $59 -> $35, $39 ;------------------------------------------------------------------------------ .MACRO CONV_PBCD_TO_ASCII T0X R2 ; Copy R0 -> R2 for re-use LDI R0, #$F0 ; Set the upper nibble mask. BCD is only 3-bit AND R2 ; Mask off the upper 3-bits of value -> R0 CLP PSR_C ; Clear the carry (in case CPU options not set) ROR R0 ; Shift the upper nibble down ROR R0 ROR R0 ROR R0 LDI R1, #$30 ; Set the ASCII upper nibble mask of $30 OR R1 ; Create an ASCII character T0X R3 ; Transfer the upper character to R3 LDI R0, #$0F ; Set the lower nibble mask AND R2 ; Mask off the lower bits OR R1 ; Create an ASCII character T0X R2 ; Store the lower character to R1 RTS .ENDM ;------------------------------------------------------------------------------
Go to most recent revision | Compare with Previous | Blame | View Log