X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Fatmel.git;a=blobdiff_plain;f=beginners%2Ftest_int.asm;h=bb01a4129922d19813c5071abbe31231aec3115f;hp=91fb4b37ceeda6145e0d126dff9ecf4cf15591c8;hb=4a03344b41c8180001804c6258a1bcbfad4f186d;hpb=c27a5b4bafdf5610c566f866b37b447223c37145

diff --git a/beginners/test_int.asm b/beginners/test_int.asm
index 91fb4b3..bb01a41 100644
--- a/beginners/test_int.asm
+++ b/beginners/test_int.asm
@@ -1,75 +1,103 @@
 ;
-; portd 3-7 blinken lights ;)
+; portd 3-7 lauflicht mit UART-RX masked byte anzeige
 ;
-; author: hackbard@hackdaworld.dyndns.org
+; by Hunz ;)
 ;
 
 .include "../include/2313def.inc"
 
 ; RESET
 rjmp INIT
-nop
 
 ; INT0
 reti
-nop
 
 ; INT1
 reti
-nop
 
 ; T1 CAPT1
 reti
-nop
 
 ; T1 COMP1
 reti
-nop
 
 ; T1 OVF1
-reti
-nop
+rjmp T1_OVF1
 
 ; T0 OVF0
 reti
-nop
 
 ; UART RX
 rjmp UART_RX
-nop
 
 ; UART UDRE
 reti
-nop
 
 ; UART TX
 reti
-nop
 
 ; ANA_COMP
 reti
-nop
+
+T1_OVF1:
+; toggle LED
+out DDRD, r17
+; next LED
+rol r17
+; skip next operation if beyond last LED
+sbrs r17, 7
+reti	; we return if not beyond last LED
+; reset LED counter to first LED
+ldi r17, 4
+reti
 
 UART_RX:
+; read received byte to r16
 in r16, UDR
+; mask with valid LED bits
 andi r16, $7C
+; echo masked byte
 out UDR, r16
+; set LEDs according to masked byte
 out DDRD, r16
 reti
 
 INIT:
+; Stackpointer setzen
 ldi r16, Low(RAMEND)
 out SPL, r16
 
 ; baudrate einstellen
 ldi r16, 11 ; "38400 bps wert" in r16
 out UBRR, r16 ; write to uart baudrate register
-sbi UCR, (RXEN|TXEN|RXCIE) ; enable tx at uart control register
 
+; enable TX, RX, Interrupt on RX
+ldi r16, ((1<<RXEN)|(1<<TXEN)|(1<<RXCIE))
+out UCR, r16
+
+; PortD Inputs - Enable all LEDs
 ldi r16, 0x7C
 out DDRD, r16
 
+; Least Significant LED
+ldi r17, 4
+
+; Timer1 Prescaler: CLK/64 (inc. Timer1 every 64 CLKs)
+ldi r16, 3
+out TCCR1B, r16
+
+; Timer1 Overflow Interrupt enable
+ldi r16, (1<<TOIE1)
+out TIMSK, r16
+
+; allow sleep mode
+ldi r16, (1<<SE)
+out MCUCR, r16
+
+; global interrupts enable
 sei
 
+; main loop
 MAIN:
+sleep
 rjmp MAIN