Microsd Cards; Table 9. Usart1 Related Jumpers; Rs-232 - ST STM32F779I-EVAL User Manual

Hardware layout and configuration
Note: The STM32F779I-EVAL board should be powered by external power supply when using
OTG function.
6.9

RS-232

RS-232 communication is supported by D-type 9-pins RS-232 connector CN7, which is
connected to the USART1 of the STM32F779NI on the STM32F779I-EVAL evaluation
board. The signal Bootloader_RESET and Bootloader_BOOT0 are added on the RS-232
connector CN7 for ISP support.
The USART1 of the STM32F779NI is shared with the RS-232 and the ST-LINK/V2-1
controller. Its communication can be changed by setting JP21 and JP26.
Jumper
JP21
JP26
JP11
6.10

microSD cards

The two 4-Gbyte (or more) microSD cards connected to SDMMC1 and SDMMC2 ports of
the STM32F779NI are available on the board. microSD card1 detection is managed by MFX
GPIO15 and microSD card2 detection is managed by MFX GPIO10.
Some PCB reworks are needed for microSD card1 application to disconnect peripherals
which share I/Os with microSD card1, and remove the camera module from the board:
• Open SB17, SB72
•
Close SB75, SB76
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Table 9. USART1 related jumpers

USART1_RX is connected to RS232 when JP21 is set as shown to the right (Default
setting, need close JP11 at the same time):
USART1_RX is connected to ST-LINK/V2-1 controller's USART_TX when JP21 is
set as shown to the right:
USART1_TX is connected to RS232 when JP26 is set as shown to the right (Default
setting):
USART1_TX is connected to ST-LINK/V2-1 controller's USART_RX when JP26 is
set as shown to the right:
JP11 is used to disconnect MCU and RS232 transceiver chip.
Default setting: Fitted
DocID029088 Rev 3
Description
UM2036