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authorDimitri Sokolyuk <demon@dim13.org>2017-08-19 12:15:28 +0200
committerDimitri Sokolyuk <demon@dim13.org>2017-08-19 12:15:28 +0200
commit67d25d837ac55f28a366c0a3b262e439a6e75fc3 (patch)
treedf7715c7724c5935ab87c807f3b8b4ef529315e3 /amforth-6.5/avr8/words/spirw.asm
parente0d6784e89dba33226c0edb815bb974486fa7c48 (diff)
Add AmForth
Diffstat (limited to 'amforth-6.5/avr8/words/spirw.asm')
-rw-r--r--amforth-6.5/avr8/words/spirw.asm26
1 files changed, 26 insertions, 0 deletions
diff --git a/amforth-6.5/avr8/words/spirw.asm b/amforth-6.5/avr8/words/spirw.asm
new file mode 100644
index 0000000..bd6616a
--- /dev/null
+++ b/amforth-6.5/avr8/words/spirw.asm
@@ -0,0 +1,26 @@
+; ( txbyte -- rxbyte)
+; MCU
+; SPI exchange of 1 byte
+VE_SPIRW:
+ .dw $ff06
+ .db "c!@spi"
+ .dw VE_HEAD
+ .set VE_HEAD = VE_SPIRW
+XT_SPIRW:
+ .dw PFA_SPIRW
+PFA_SPIRW:
+ rcall do_spirw
+ clr tosh
+ jmp_ DO_NEXT
+
+do_spirw:
+ out_ SPDR, tosl
+do_spirw1:
+ in_ temp0, SPSR
+ cbr temp0,7
+ out_ SPSR, temp0
+ in_ temp0, SPSR
+ sbrs temp0, 7
+ rjmp do_spirw1 ; wait until complete
+ in_ tosl, SPDR
+ ret