Xnucleo User Manual
11
V2.6.1, Apr. 25
th
2015
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Connect the RX/PA3 of JP4 to the TXD;
Connect the TX/PA2 of JP4 to the RXD.
2.5.2
COMMUNICATION BETWEE N THE TA RGETED MCU AND SHIELD OR
EXTENSION BOA RD
If the communication between the targeted MCU and shield or extension board is required, you
should set the JP4 and the RX/D0 and TX/D1 on CN9 as follow (For more information, please
refer to Table 6).
Connect the RX/PA3 of JP4 to the RX/D0;
Connect the TX/PA3 of JP4 to the TX/D1.
In such case it possible to connect another USART (if another USART is available on the targeted
MCU) to the targeted MCU through Virtual COM Port using flying wires as follow
Connect the TX/PC10/PC6 of JP4 to RXD;
Connect the RX/PC11/PC of JP4 to TXD.
Here is the jumper setting for connecting to XNUCLEO-F030R8:
Connect the TX/PA9 of JP4 to RXD;
Connect the RX/PA10 of JP4 to TXD.
Notices: You should select a proper USART by referring to Table 5 and make corresponding
hardware configurations, according to your actual demand. The USARTs (USART1 and USART3)
listed in this table are unavailable under mbed, since only USART2(PA2, PA3) is defined for mbed.
Therefore, when the USART-related APIs (such as printf) are required under mbed, you should
select USART2(PA2, PA3) to connect to Virtual COM Port or CN9 on the pins RX/D0 and TX/D1.
Table 5: USART-related pins and jumpers
Model\pin
PC6,PC7
PC10,PC11
PA9,PA10
SB70,SB71
SB72,SB73
XNUCLEO
-F030R8
None
None
USART1
None
XNUCLEO
-F103RB
None
USART3
USART1
(NC)
ON
OFF
XNUCLEO
-F302R8
None
USART3
USART1
(NC)
ON
OFF
