added beginners directory, test_uart.asm

diff --git a/beginners/test_uart.asm b/beginners/test_uart.asm
new file mode 100644 (file)
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
+