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authorChristian Pointner <equinox@spreadspace.org>2013-07-12 00:56:13 (GMT)
committerChristian Pointner <equinox@spreadspace.org>2013-07-12 00:56:13 (GMT)
commit1caa0e9ec310c14156e2f8239fdd09c939ccac58 (patch)
treef81135b6fc1318acb495e3b3b26a447c8994bedb
parent78481d8aec1a3d2ba659035b1c81f9291957ef02 (diff)
started support for com-spi for 16f887
git-svn-id: https://svn.spreadspace.org/pic/trunk@85 a09c6847-51d9-44de-8ef2-e725cf50f3c7
-rw-r--r--bootloader/bootloader-887.asm3
-rw-r--r--bootloader/com-16f887-spi.inc64
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