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diff --git a/led_plex/main.asm b/led_plex/main.asm
new file mode 100644
index 0000000..cfa8c2e
--- /dev/null
+++ b/led_plex/main.asm
@@ -0,0 +1,129 @@
+; main file of led_plex project
+;
+; author: hackbard@hackdaworld.org
+;
+
+; device specific definition file
+.include "../include/tn2313def.inc"
+
+; defines
+.def	tmp1		= r16
+.def	tmp2		= r17
+.def	uart_rxtx	= r18
+
+;
+; interrupts
+;
+
+; RESET
+rjmp INIT
+
+; INT0
+reti
+
+; INT1
+reti
+
+; T1 CAPT1
+reti
+
+; T1 COMP A
+reti
+
+; T1 OVF1
+rjmp T1_OVF1
+
+; T0 OVF0
+rjmp T0_OVF0
+
+; UART RX
+rjmp UART_RX
+
+; UART UDRE
+reti
+
+; UART TX
+reti
+
+; ANA COMP
+reti
+
+; PCINT
+reti
+
+; T1 COMP B
+reti
+
+; T0 COMP A
+reti
+
+; T0 COMP B
+reti
+
+; USI START
+reti
+
+; USI OVF
+reti
+
+; EE READY
+reti
+
+; WDT OVF
+reti
+
+
+; include control defines
+.include "ctrl.def"
+
+RESET:
+INIT:
+
+	; port init
+	rcall PORT_INIT
+
+	; timer init
+	rcall TIMER_INIT
+
+	; uart init
+	rcall UART_INIT
+
+	; uart interrupt enable
+	rcall UART_INT_RX_INIT
+
+	; set stackpointer
+	ldi tmp1,low(RAMEND)
+	out SPL,tmp1
+
+	; global interrupt enable
+	;sei 
+
+	; signal ready output
+	ldi uart_rxtx,0x23
+	rcall UART_TX
+
+MAIN:
+
+	; loop forever
+	rjmp MAIN
+
+
+; include subroutines
+.include "port.asm"
+.include "timer.asm"
+.include "uart.asm"
+
+
+;
+; interrupt routines
+;
+
+T1_OVF1:
+	reti
+
+T0_OVF0:
+	reti
+
+UART_RX:
+	reti
+