UART via USB
Modern PC computers, laptops and notebooks are
no longer equipped with RS-232 connectors and
UART controllers. They are nowadays replaced with
USB connectors and USB controllers. Still, certain technology
enables UART communication to be done via USB connection.
FT232RL
from FTDI® convert UART signals to the appropriate USB
standard. In order to use USB-UART module on EasyAVR
™
v7, you must
first install FTDI drivers on your computer. Drivers can be
found on
Product DVD
:
USB-UART communication is being done through
a FT232RL controller, USB connector
(CN4)
, and
microcontroller UART module. To establish this connection,
you must put
J23
and
J12
jumpers in the
USB-UART
position, and connect
RX
and
TX
lines to the
appropriate pins of the microcontroller.
This connection is done using DIP
switch
SW10
.
RX-FTDI
RX-232
TX-FTDI
TX-232
J23
J12
DATA BUS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
TXD
DTR#
RTS#
VCCIO
RXD
RI#
GND
NC
DSR#
DCD#
CTS#
CBUS4
CBUS2
CBUS3
CBUS0
CBUS1
OSCO
OSCI
TEST
AGND
NC
GND
GND
VCC
RESET#
3V3OUT
USBDM
USBDP
FT232RL
U1
FT232RL
VCC-5V
C6
100nF
LD12
LD13
RX-LED1
TX-LED1
R16
4K7
R15
2K2
R18
1K
R26
2K2
1
2
3
4
VCC
GND
D-
D+
CN4
USB B
C1
100nF
C2
100nF
E1
10uF
VCC-5V
VCC-5V
TX-FTDI
RX-FTDI
U
S
B
U
A
R
T
I
CO
N
N
EC
TO
R
FTDI1-D_N
FTDI1-D_P
VCC-BRD
VCC-BRD
VCC-BRD
VCC-BRD
R57
100K
VCC-BRD
1
2
3
4
5
6
7
8
O
N
SW10
RX
TX
PD1
PD3
PD0
PD2
RX-FTDI
TX-FTDI
Figure 7-1: USB-UART connection schematic
Enabling USB-UART
In order to enable USB-UART
communication, you must set
J23
and
J12
jumpers in the
USB-UART
position, and enable desired
RX
and
TX
lines via
SW10
DIP switch.
For example, if you want to enable
USB-UART connection on UART
module of the default
ATmega32
chip, you should enable
SW10.1
(RD0) and
SW10.2
(RD1) lines.
DVD://download/eng/software/development-tools/
universal/ftdi/vcp_drivers.zip
page 15
communica
tion
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