From: hackbard <hackbard>
Date: Thu, 4 Dec 2003 23:24:24 +0000 (+0000)
Subject: added beginners directory, test_uart.asm
X-Git-Url: https://hackdaworld.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=238f9858dcb3b72ccf1b570333f8c82ca18c8811;p=my-code%2Fatmel.git

added beginners directory, test_uart.asm
---

238f9858dcb3b72ccf1b570333f8c82ca18c8811
diff --git a/beginners/test_uart.asm b/beginners/test_uart.asm
new file mode 100644
index 0000000..c785c36
--- /dev/null
+++ b/beginners/test_uart.asm
@@ -0,0 +1,17 @@
+; specify device
+.DEVICE AT90S2313
+
+; baudrate einstellen
+ldi r16, 11 ; "38400 bps wert" in r16
+out UBRR, r16 ; write to uart baudrate register
+sbi UCR, TXEN ; enable tx at uart control register
+
+; transmit 0x23 all the fucking time ...
+ldi r16, 0x23 ; load 0x23 to register
+out UDR, r16 ; write that to uart data register port
+LOOP:
+sbis USR, UDRE
+rjmp LOOP
+out UDR, r16
+rjmp LOOP
+