UM1065
Hardware layout and configuration
Doc ID 018640 Rev 4
2.8
RS-232 and IrDA
Both RS-232 and IrDA communication is enabled by D-type 9-pin RS-232 connector (CN16)
and IrDA transceiver U11 which are connected to USART3 of STM32F217IGH6 on the
STM3221G-EVAL evaluation board.
For ISP support, two signals are added on the RS-232 connector CN16:
●
Bootloader_RESET (shared with CTS signal)
●
Bootloader_BOOT0 (shared with DSR signal)
RS-232 or IrDA can be selected by setting JP22, and ISP can be enabled by setting JP29
and JP34 as shown in
.
Table 6.
RS-232 and IrDA related jumper
Jumper
Description
JP22
To connect USART3_RX to IrDA transceiver and enable IrDA communication,
set JP22 as shown:
To connect USART3_RX to RS-232 transceiver and enable RS-232
communication, set JP22 as shown (Default setting):
To enable MicroSD Card, which shares same I/Os with RS-232, JP22 is not fitted.
JP29
Bootloader_BOOT0 is managed by pin 6 of CN16 (RS-232 DSR signal) when JP29 is
closed. This configuration is used for boot loader application only.
Default setting: Not fitted.
JP34
Bootloader_RESET is managed by pin 8 of CN16 (RS-232 CTS signal) when JP34 is
fitted. This configuration is used for boot loader application only.
Default setting: Not fitted.
3
2
1
3
2
1