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|
;;
;; spreadspace pic utils
;;
;;
;; Copyright (C) 2011 Christian Pointner <equinox@spreadspace.org>
;;
;; This file is part of spreadspace pic utils.
;;
;; spreadspace pic utils is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; any later version.
;;
;; spreadspace pic utils is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with spreadspace pic utils. If not, see <http://www.gnu.org/licenses/>.
;;
wait_new_cmd
movlw combuff
movwf FSR
clrf combuff
clrf current_cmdlen
clrf flags
wait_cmd
call com_rx_byte
movwf INDF ; process received byte
incf FSR,f
btfss F_CMD_STARTED
goto wait_cmd_len
movf current_cmdlen,f
btfsc STATUS,Z
goto new_cmd
decfsz current_cmdlen,f
goto wait_cmd
goto exec_cmd
wait_cmd_len ; command code received, now wait for length
bsf F_CMD_STARTED
goto wait_cmd
new_cmd ; got new command code and length -> check it
movf combuff,w
sublw CMD_MAX
btfss STATUS,C
goto invalid_cmd
movlw CMD_MIN_LEN ; check for minimum command len
subwf combuff + .1,w
btfss STATUS,C
goto invalid_cmd
movlw .2 ; 2 bytes already received
subwf combuff + .1,w
movwf current_cmdlen
goto wait_cmd
exec_cmd ; command is complete -> check csum
movlw combuff
movwf FSR
movf combuff + .1,w
movwf cnt
clrf csum
exec_cmd_check_csum
movf INDF,w
xorwf csum,f
incf FSR,f
decfsz cnt,f
goto exec_cmd_check_csum
movf csum,f
btfss STATUS,Z
goto csum_error
movf combuff,w ; command is correct and complete -> dispatch
addwf PCL,f
goto wait_new_cmd
goto cmd_identify ; identify
goto cmd_boot ; boot
goto HOOK_CMD_RESET ; reset
goto HOOK_CMD_R_FLASH ; read flash segment
goto HOOK_CMD_W_FLASH ; write flash segment
goto HOOK_CMD_R_EEPROM ; read eeprom
goto HOOK_CMD_W_EEPROM ; write eeprom
goto HOOK_CMD_R_CONFIG ; read config
goto HOOK_CMD_R_CONFIG ; write config
;; ** generic error messages *******
invalid_cmd ; received command code is not known or len is bogus
movlw E_INV_CMD
call ack_cmd
goto wait_new_cmd
csum_error ; received command has an invalid check sum
movlw E_BAD_CSUM
call ack_cmd
goto wait_new_cmd
address_invalid ; received command uses invalid address (i.e. not aligned to 16bytes)
movlw E_ADDR_INVALID
call ack_cmd
goto wait_new_cmd
address_prohibited ; received command uses prohibited address (i.e. FLASH < 0x100)
movlw E_ADDR_PROHIB
call ack_cmd
goto wait_new_cmd
;; ** generic command handlers ************
;; ** identify *******
cmd_identify
clrf csum
movf combuff,w
call com_tx_byte
movlw .19
call com_tx_byte
movlw E_OK
call com_tx_byte
movlw VERSION_MIN
call com_tx_byte
movlw VERSION_MAJ
call com_tx_byte
movlw NAME_0
call com_tx_byte
movlw NAME_1
call com_tx_byte
movlw NAME_2
call com_tx_byte
movlw DEVID_L
call com_tx_byte
movlw DEVID_H
call com_tx_byte
movlw FLASH_SIZE_L
call com_tx_byte
movlw FLASH_SIZE_H
call com_tx_byte
movlw FSS
call com_tx_byte
movlw EEPROM_SIZE_L
call com_tx_byte
movlw EEPROM_SIZE_H
call com_tx_byte
movlw MESS
call com_tx_byte
movlw SUPPORTED_L
call com_tx_byte
movlw SUPPORTED_H
call com_tx_byte
movf csum,w
call com_tx_byte
goto wait_new_cmd
;; ** boot *******
cmd_boot
movlw E_OK
call ack_cmd
goto USERVECT
;; ** not implemented commands *******
cmd_not_impl
movlw E_NOT_IMPL
call ack_cmd
goto wait_new_cmd
|
