;; ;; spreadspace pic utils ;; ;; ;; Copyright (C) 2011 Christian Pointner ;; ;; 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 . ;; ;; ------------------------------------- ;; PREAMBLE LIST p=16F887 include "p16f887.inc" __config _CONFIG1, _DEBUG_OFF & _LVP_OFF & _FCMEN_OFF & _IESO_OFF & _BOR_OFF & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_OFF & _WDT_OFF & _INTOSC __config _CONFIG2, _BOR21V & _WRT_256 ;; ------------------------------------- ;; DEFINES #define BOOTPIN PORTC,7 USERVECT EQU H'100' ISRVECT EQU USERVECT + H'4' VERSION_MAJ EQU .0 VERSION_MIN EQU .1 DEVID_H EQU H'20' DEVID_L EQU H'82' FSS EQU .8 MESS_H EQU 0 MESS_L EQU .64 SUPPORTED_H EQU 0 SUPPORTED_L EQU b'00011111' ; reset, read/write flash, read/write eeprom ;; ERROR codes E_OK EQU .0 E_INV_CMD EQU .1 E_BAD_CSUM EQU .2 E_NOT_IMPL EQU .3 E_FLASH_WERR EQU .4 E_ADDR_INVALID EQU .5 E_ADDR_PROHIB EQU .6 ;; CMD codes CCMD_IDENTIFY EQU 'i' CMD_IDENTIFY EQU .0 CCMD_BOOT EQU 'b' CMD_BOOT EQU .1 CCMD_RESET EQU 'r' CMD_RESET EQU .2 CCMD_R_FLASH EQU 'f' CMD_R_FLASH EQU .3 CCMD_W_FLASH EQU 'F' CMD_W_FLASH EQU .4 CCMD_R_EEPROM EQU 'e' CMD_R_EEPROM EQU .5 CCMD_W_EEPROM EQU 'E' CMD_W_EEPROM EQU .6 CCMD_R_CONFIG EQU 'c' CMD_R_CONFIG EQU .7 CCMD_W_CONFIG EQU 'C' CMD_W_CONFIG EQU .8 CMD_INVALID EQU H'FF' ;; Variables inbuff EQU H'0020' inbuff_end EQU H'006F' current_cmd EQU H'0070' current_cmdlen EQU H'0071' csum EQU H'0072' cnt1 EQU H'0070' cnt2 EQU H'0071' ;; ------------------------------------- ;; Boot test org .0 ;; btfsc BOOTPIN ;; goto USERVECT goto boot ;; ------------------------------------- ;; goto user ISR org .4 isr goto ISRVECT ;; ------------------------------------- ;; Bootloader (Subroutines) uart_tx_byte btfss PIR1,TXIF goto uart_tx_byte movwf TXREG xorwf csum,f return translate_cmd_codes xorlw CCMD_IDENTIFY btfsc STATUS,Z retlw CMD_IDENTIFY xorlw CCMD_BOOT ^ CCMD_IDENTIFY btfsc STATUS,Z retlw CMD_BOOT xorlw CCMD_RESET ^ CCMD_BOOT btfsc STATUS,Z retlw CMD_RESET xorlw CCMD_R_FLASH ^ CCMD_RESET btfsc STATUS,Z retlw CMD_R_FLASH xorlw CCMD_W_FLASH ^ CCMD_R_FLASH btfsc STATUS,Z retlw CMD_W_FLASH xorlw CCMD_R_EEPROM ^ CCMD_W_FLASH btfsc STATUS,Z retlw CMD_R_EEPROM xorlw CCMD_W_EEPROM ^ CCMD_R_EEPROM btfsc STATUS,Z retlw CMD_W_EEPROM xorlw CCMD_R_CONFIG ^ CCMD_W_EEPROM btfsc STATUS,Z retlw CMD_R_CONFIG xorlw CCMD_W_CONFIG ^ CCMD_R_CONFIG btfsc STATUS,Z retlw CMD_W_CONFIG retlw CMD_INVALID get_cmdlen addwf PCL,f retlw .1 ; identify: retlw .1 ; boot: retlw .1 ; reset: retlw .3 ; read flash: addr | retlw .3 + .2*FSS ; write flash: addr | data | retlw .5 ; read eeprom: addr | len | retlw .5 ; write eeprom: addr | len | data | (minimal) retlw .2 ; read config: nr | retlw .4 ; write config: nr | word | get_name addwf PCL,f nop retlw 'c' retlw 'i' retlw 'p' retlw 'x' retlw 'o' retlw 'n' retlw 'i' retlw 'u' retlw 'q' retlw 'e' ;; ------------------------------------- ;; Bootloader (init) boot ;; bank 3 bsf STATUS,RP0 bsf STATUS,RP1 movlw b'00001000' ; TX non-inverted, 16bit Baudrate, no auto baud detect ;; movlw b'00011000' ; TX inverted, 16bit Baudrate, no auto baud detect movwf BAUDCTL ;; bank 1 bcf STATUS,RP1 movlw b'01110000' ; set internal OSC to 8MHz movwf OSCCON movlw b'00100100' ; Baudrate = High Speed, async mode, transmit enabled, 8bit movwf TXSTA movlw .34 ; Baudrate = 57600 (@ 8MHz) -> -0,79 % Error ;; movlw .51 ; Baudrate = 38400 (@ 8MHz) -> -0,002 % Error ;; movlw .103 ; Baudrate = 19200 (@ 8MHz) -> 0,16 % Error movwf SPBRG clrf SPBRGH bcf TRISD,0 ; DEBUG!!!! ;; bank 0 bcf STATUS,RP0 movlw b'10010000' ; enable Serial Port, 8bit, enable continues receive, disable address detection movwf RCSTA bsf PORTD,0 ; DEBUG!!!! wait_new_cmd movlw inbuff movwf FSR movlw CMD_INVALID movwf current_cmd clrf current_cmdlen wait_cmd btfsc PIR1,RCIF goto uart_rx_byte btfsc RCSTA,OERR goto uart_rx_oe goto wait_cmd uart_rx_oe bcf RCSTA,CREN bsf RCSTA,CREN goto wait_new_cmd uart_rx_byte btfsc RCSTA,FERR goto uart_rx_fe movf RCREG,w ; TODO: check parity?? movwf INDF incf FSR,f movf current_cmdlen,f btfsc STATUS,Z goto new_cmd decfsz current_cmdlen,f goto wait_cmd goto exec_cmd uart_rx_fe movf RCREG,w goto wait_new_cmd new_cmd call translate_cmd_codes movwf current_cmd xorlw CMD_INVALID btfsc STATUS,Z goto invalid_cmd movf current_cmd,w call get_cmdlen movwf current_cmdlen goto wait_cmd invalid_cmd clrf csum movf inbuff,w call uart_tx_byte movlw E_INV_CMD call uart_tx_byte movf csum,w call uart_tx_byte goto wait_new_cmd exec_cmd ;; DEBUG !!!! bcf PORTD,0 movlw .255 movwf cnt1 dbgcnt1 movlw .255 movwf cnt2 dbgcnt2 decfsz cnt2,f goto dbgcnt2 decfsz cnt1,f goto dbgcnt1 bsf PORTD,0 ;; DEBUG !!!! ;; TODO: check csum movf current_cmd,w addwf PCL,f goto cmd_identify goto cmd_boot goto cmd_reset goto cmd_r_flash goto cmd_w_flash goto cmd_r_eeprom goto cmd_w_eeprom goto cmd_r_config goto cmd_w_config goto wait_new_cmd cmd_identify clrf csum movlw CCMD_IDENTIFY call uart_tx_byte movlw E_OK call uart_tx_byte movlw VERSION_MIN call uart_tx_byte movlw VERSION_MAJ call uart_tx_byte movlw .10 movwf cnt1 cmd_identify_send_name movf cnt1,w call get_name call uart_tx_byte decfsz cnt1,f goto cmd_identify_send_name movlw DEVID_L call uart_tx_byte movlw DEVID_H call uart_tx_byte movlw FSS call uart_tx_byte movlw MESS_L call uart_tx_byte movlw MESS_H call uart_tx_byte movlw SUPPORTED_L call uart_tx_byte movlw SUPPORTED_H call uart_tx_byte movf csum,w call uart_tx_byte goto wait_new_cmd cmd_boot goto wait_new_cmd cmd_reset goto wait_new_cmd cmd_r_flash goto wait_new_cmd cmd_w_flash goto wait_new_cmd cmd_r_eeprom goto wait_new_cmd cmd_w_eeprom goto wait_new_cmd cmd_r_config goto wait_new_cmd cmd_w_config goto wait_new_cmd ;; ------------------------------------- ;; dummy user code org USERVECT ;; goto USERVECT bsf STATUS,RP0 bcf TRISD,0 bcf STATUS,RP0 userloop movlw b'00000001' xorwf PORTD,f movlw .255 movwf cnt1 usercnt1 movlw .255 movwf cnt2 usercnt2 decfsz cnt2,f goto usercnt2 decfsz cnt1,f goto usercnt1 goto userloop ;; ------------------------------------- ;; END end