Changeset 7d5e268 in avrstuff

Timestamp:

Oct 29, 2010, 8:03:56 PM (14 years ago)

Author:

Adrien Destugues <pulkomandy@…>

Branches:

main

Children:

98713b5

Parents:

741c0b9

Message:

Add some init code.

git-svn-id: ​svn://pulkomandy.tk/avrstuff@29 c6672c3c-f6b6-47f9-9001-1fd6b12fecbe

File:

• CPC stuff/cpc_serial_2313/code/main.asm (modified) (3 diffs)

CPC stuff/cpc_serial_2313/code/main.asm

@@ -14 +14 @@
 
 .EQU CTRLIN = PIND
-.EQU A0 = PIND4
+.EQU CTRLOUT = PORTD
+.EQU CTRLDIR = DDRD
+
+.EQU A0 = PIND5
+.EQU _READ = PIND3
+.EQU _WRITE = PIND2
+.EQU DEL = PIND6
+.EQU INT = PIND4
 
 .EQU curregbak = SRAM_START
@@ -74 +81 @@
 
 ; release the bus
-        LDI R16,ALL_IN
+        SER R16
         OUT DATADIR, R16
-        LDI R16,ALL_OUT
+        CLR R16
 
 ; Restore R27 to selected reg. (we erased it to do the OUT)
@@ -112 +119 @@
 ; * Set up the INT0 and INT1 so the CPC can do the rest of the setup itself
 init:
-        ; setup ctrl port : RW and A0 as inputs, INT as output
+        CLI
+        ; setup ctrl port : RW and A0 as inputs, INT and DEL as output
+        LDI R16,0x28
+        OUT CTRLDIR,R16
+
+        ; setup dataport as input
+        CLR R0
+        OUT DATADIR,R0
+
         ; led on (will be turned off by software at init)
+        SBI CTRLOUT,DEL
+
         ; init serial port speed and io
+        LDI R16,10
+        OUT UBRR,R16
+
         ; check for bootloader jumper and jump to bootload code if needed
+        ; TODO
 
+        ; setup interrupts (enable INT0 and INT1 on falling edge)
+        LDI R16,0x0A
+        OUT MCUCR,R16
+
+        LDI R16,0xC0
+        OUT GIMSK,R16
+
+        ; we can now enable interrupts
         SEI
+
 mainloop:
         ; maybe we will have to handle a buffer for the serial port