X-Git-Url: https://hackdaworld.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=hdw-tank%2Fuart.asm;fp=hdw-tank%2Fuart.asm;h=1ca82e08995e55fa26e0c3c14fae516952d60a8d;hb=bc07798b093617e4b907b3fdb2155dc098b03e0b;hp=0000000000000000000000000000000000000000;hpb=04ffc37ce69bf3d8c175ddae51b0fda6d7848310;p=my-code%2Fatmel.git

diff --git a/hdw-tank/uart.asm b/hdw-tank/uart.asm
new file mode 100644
index 0000000..1ca82e0
--- /dev/null
+++ b/hdw-tank/uart.asm
@@ -0,0 +1,36 @@
+; uart functions
+
+UART_INIT:
+
+	; baudrate
+	ldi tmp,
+	out UBRRH,tmp
+	ldi tmp,
+	out UBRRL,tmp
+
+	; enable
+	ldi tmp,(1<<RXEN)|(1<<TXEN)
+	out UCSRB,tmp
+
+	; frame format
+
+	ret
+
+UART_RX:
+
+	; get/store received byte
+	sbis UCSRA,RXC
+		rjmp UART_RX
+	in tmp,UDR0
+
+	ret
+
+UART_TX:
+
+	; transmit content of tmp
+	sbis UCSRA,UDRE
+		rjmp UART_TX
+	out UDR0,tmp
+
+	ret
+