started support for com-spi for 16f887

git-svn-id: https://svn.spreadspace.org/pic/trunk@85 a09c6847-51d9-44de-8ef2-e725cf50f3c7

2 files changed, 66 insertions, 1 deletions

diff --git a/bootloader/bootloader-887.asm b/bootloader/bootloader-887.asm
index e767372..521ad18 100644
--- a/bootloader/bootloader-887.asm
+++ b/bootloader/bootloader-887.asm
@@ -76,7 +76,8 @@ cnt             EQU       H'007F'
 
   ;; -------------------------------------
   ;; Bootloader (com specific subroutines and init)
-#include "com-16f887-uart.inc"
+;; #include "com-16f887-uart.inc"
+#include "com-16f887-spi.inc"
 
   ;; -------------------------------------
   ;; Bootloader (generic init/body)
diff --git a/bootloader/com-16f887-spi.inc b/bootloader/com-16f887-spi.inc
new file mode 100644
index 0000000..7f501cf
--- /dev/null
+++ b/bootloader/com-16f887-spi.inc
@@ -0,0 +1,64 @@
+  ;;
+  ;;  spreadspace pic utils
+  ;;
+  ;;
+  ;;  Copyright (C) 2011-2013 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/>.
+  ;;
+
+  ;; --- transmit byte and add it to csum
+com_tx_byte
+  ;;  TODO add write
+  xorwf     csum,f
+  return
+
+  ;; ---- wait for byte to be received
+com_rx_byte
+  bsf       STATUS,RP0
+  btfsc     SSPSTAT,BF
+  goto      com_rx_got_byte
+  bcf       STATUS,RP0
+  btfss     SSPCON,SSPOV
+  goto      com_rx_byte
+  movf      SSPBUF,w
+  bcf       SSPCON,SSPOV
+  goto      com_rx_byte
+
+com_rx_got_byte
+  bsf       STATUS,RP0
+  movf      SSPBUF,w
+  return
+
+  ;; ----- initialize com (not a subroutine, com_init is called by generic_init
+com_init
+  ;; bank 3
+  bsf       STATUS,RP0
+  bsf       STATUS,RP1
+  bcf       ANSEL,ANS4          ; RA5/SS as digital input
+
+  ;; bank 1
+  bcf       STATUS,RP1
+  movlw     b'01110000'         ; set internal OSC to 8MHz
+  movwf     OSCCON
+  movlw     b'01000000'         ; SMP=0,CKE=1
+  movwf     SSPSTAT
+  bcf       TRISC,5             ; RC5(SDO) = out
+
+  ;; bank 0
+  bcf       STATUS,RP0
+  movlw     b'00100100'         ; SSPEN=1,CKP=0,SSPM=0100(SPI Slave with SS)
+  movwf     SSPCON