From 5e516e6bebee209aaa0738d1039c66f814ca1c3c Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Thu, 4 Jul 2013 00:42:37 +0000
Subject: handling of invalid commands

git-svn-id: https://svn.spreadspace.org/pic/trunk@31 a09c6847-51d9-44de-8ef2-e725cf50f3c7
---
 bootloader/bootloader.asm | 72 +++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 61 insertions(+), 11 deletions(-)

(limited to 'bootloader/bootloader.asm')

diff --git a/bootloader/bootloader.asm b/bootloader/bootloader.asm
index b32affd..684501d 100644
--- a/bootloader/bootloader.asm
+++ b/bootloader/bootloader.asm
@@ -72,6 +72,8 @@ 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'
@@ -133,15 +135,15 @@ translate_cmd_codes
   xorlw     CCMD_W_CONFIG ^ CCMD_R_CONFIG
   btfsc     STATUS,Z
   retlw     CMD_W_CONFIG
-  retlw     H'FF'
+  retlw     CMD_INVALID
 
-get_cmd_len
+get_cmdlen
   addwf     PCL,f
   retlw     1			; identify:     <csum>
   retlw     1			; boot:         <csum>
   retlw     1			; reset:        <csum>
   retlw     3			; read flash:   addr | <csum>
-  retlw     3 + FSS		; write flash:  addr | data | <csum>
+  retlw     3 + 2*FSS		; write flash:  addr | data | <csum>
   retlw     5			; read eeprom:  addr | len | <csum>
   retlw     5			; write eeprom: addr | len | data | <csum> (minimal)
   retlw     2			; read config:  nr | <csum>
@@ -169,11 +171,23 @@ boot
   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
@@ -184,27 +198,63 @@ wait_cmd
 uart_rx_oe
   bcf       RCSTA,CREN
   bsf       RCSTA,CREN
-  goto      wait_cmd
+  goto      wait_new_cmd
 
 uart_rx_byte
   btfsc     RCSTA,FERR
   goto      uart_rx_fe
   movf      RCREG,w             ; TODO: check parity??
-				; TODO: move to input string
-	;; TODO: check if command is finished and jump
-	;;       to 'exec_cmd'
-  call      translate_cmd_codes
-  call      uart_tx_byte
+  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
+  movf      inbuff,w
+  call      uart_tx_byte
+  movlw     E_INV_CMD
+  call      uart_tx_byte
+  movlw     E_INV_CMD
+  xorwf     inbuff,w
+  call      uart_tx_byte
+  goto      wait_new_cmd
+
 exec_cmd
 	;; TODO: execute received command
-  goto      wait_cmd
+  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
+
+  goto      wait_new_cmd
+
 
   ;; -------------------------------------
   ;; dummy user code
@@ -215,7 +265,7 @@ exec_cmd
   bcf       STATUS,RP0
 userloop
   movlw     b'00000001'
-  xorwf     TRISD,f
+  xorwf     PORTD,f
   movlw     .255
   movwf     cnt1
 usercnt1
-- 
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