From 9d55aec060472da1faa198e7068d82cbd62a2cd3 Mon Sep 17 00:00:00 2001
From: hackbard <hackbard>
Date: Sat, 17 Jun 2006 12:53:06 +0000
Subject: [PATCH] added ports/uart test code for atmega32

---
 beginners/test_ports_uart.asm | 94 +++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 beginners/test_ports_uart.asm

diff --git a/beginners/test_ports_uart.asm b/beginners/test_ports_uart.asm
new file mode 100644
index 0000000..f870a3e
--- /dev/null
+++ b/beginners/test_ports_uart.asm
@@ -0,0 +1,94 @@
+;
+; test all ports and uart
+;
+
+.include "../include/m32def.inc"
+
+INIT:
+
+	; all ports outputs
+	ldi r16,0xff
+	out DDRA,r16
+	out DDRB,r16
+	out DDRC,r16
+	out DDRD,r16
+
+	; uart baudrate (8mhz -> 38.4k) + enable
+	ldi r16,0
+	out UBRRH,r16
+	ldi r16,12
+	out UBRRL,r16
+	sbi UCSRB,TXEN
+
+	; led counter
+	ldi r17,0
+	; loop counter
+	ldi r18,0
+
+MAINLOOP:
+
+	; reset loop counter
+	ldi r18,0
+
+	; the delay loop
+	LOOP:
+	
+		; the dely loop in the delay loop
+		ldi r22,0
+		INNERLOOP:
+
+			inc r22
+			cpi r22,0xff
+			brne INNERLOOP
+	
+		; increase loop counter
+		inc r18
+
+		; check loop counter
+		cpi r18,0xff
+
+		; continue if loop counter = 0xff
+		; else do loop again
+		brne LOOP
+		
+	; shift the led counter
+	lsl r17
+	
+	; set first bit if led counter is equal zero
+	cpi r17,0
+	brne LEDOUT
+	ldi r17,1
+
+	; drive the leds
+	LEDOUT:
+	ldi r21,0xff
+	sub r21,r17
+	out PORTA,r21
+	out PORTB,r21
+	out PORTC,r21
+	out PORTD,r21
+
+	; get the number we want to transmit
+	mov r19,r17
+	ldi r20,0x30 ; ascii 0
+	GETNUMBER:
+
+		lsr r19
+		inc r20
+		cpi r19,0
+		brne GETNUMBER
+
+	; uart transmit
+	UARTOUT:
+
+		; try again if uart not ready
+		sbis UCSRA,UDRE
+		rjmp UARTOUT
+
+	; transmit the number
+	out UDR,r20
+		
+	; loop forever
+	rjmp LOOP
+
+; eof
-- 
2.20.1