X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Fatmel.git;a=blobdiff_plain;f=monolyzer%2Fuart.asm;fp=monolyzer%2Fuart.asm;h=fbfbf3d9342ff655be3bf5dfbac3461ca1a5ef80;hp=0000000000000000000000000000000000000000;hb=41d981471644f11151e4f1691c4a29c44fb12410;hpb=32e3f51bc0f4248019379fe784d38c7fb770f952

diff --git a/monolyzer/uart.asm b/monolyzer/uart.asm
new file mode 100644
index 0000000..fbfbf3d
--- /dev/null
+++ b/monolyzer/uart.asm
@@ -0,0 +1,60 @@
+; uart functions
+
+; default uart settings / 19.2k @ 8 mhz
+; ifndef UART_BR_H
+.equ	UART_BR_H	= 0
+; ifndef UART_BR_L
+.equ	UART_BR_L	= 25
+
+UART_INIT:
+
+	; baudrate
+	ldi tmp1,UART_BR_H
+	out UBRRH,tmp1
+	ldi tmp1,UART_BR_L
+	out UBRRL,tmp1
+
+	; enable
+	ldi tmp1,(1<<RXEN)|(1<<TXEN)
+	out UCSRB,tmp1
+
+	; frame format -> 8n1
+	ldi tmp1,(1<<UCSZ0)|(1<<UCSZ1)
+	out UCSRC,tmp1
+
+	ret
+
+UART_INT_RX_INIT:
+
+	in tmp1,UCSRB
+	sbr tmp1,(1<<RXCIE)
+	out UCSRB,tmp1
+
+	ret
+
+UART_INT_TX_INIT:
+
+	in tmp1,UCSRB
+	sbr tmp1,(1<<TXCIE)
+	out UCSRB,tmp1
+
+	ret
+
+UART_RX:
+
+	; get/store received byte
+	sbis UCSRA,RXC
+		rjmp UART_RX
+	in uart_rxtx,UDR
+
+	ret
+
+UART_TX:
+
+	; transmit content of uart_rxtx
+	sbis UCSRA,UDRE
+		rjmp UART_TX
+	out UDR,uart_rxtx
+
+	ret
+