1 files changed, 73 insertions, 0 deletions
diff --git a/software/pic.bootloader/com-16f887-spi.inc b/software/pic.bootloader/com-16f887-spi.inc
new file mode 100644
index 0000000..4fb41c8
--- /dev/null
+++ b/software/pic.bootloader/com-16f887-spi.inc
@@ -0,0 +1,73 @@
+  ;;
+  ;;  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
+  movwf     SSPBUF
+  bcf       INTPIN
+  xorwf     csum,f
+com_tx_byte_wait1
+  btfsc     PORTA,5
+  goto      com_tx_byte_wait1
+com_tx_byte_wait2
+  btfss     PORTA,5
+  goto      com_tx_byte_wait2
+  movf      SSPBUF,w
+  bsf       INTPIN
+  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
+  bcf       STATUS,RP0
+  movf      SSPBUF,w
+  return
+
+  ;; ----- initialize com (this is called by bootmacro, it's not a subroutine - no return at the end)
+com_init
+  ;; bank 3 -  we are already there, see bootmacro
+  ;; 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
+  bcf       INTPIN              ; interrupt line to master
+
+  ;; bank 0
+  bcf       STATUS,RP0
+  btfsc     BOOTPIN
+  goto      USERVECT
+  movlw     b'00100100'         ; SSPEN=1,CKP=0,SSPM=0100(SPI Slave with SS)
+  movwf     SSPCON
+  bsf       INTPIN