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STR71x BSPI USED AS A UART

3 STR71X CONFIGURATION

This application was implemented with a STR71X. This microcontroller uses a 16 MHz ex-

ternal clock (quartz). A description of the baud rate selection is given later in this application

note.

3.1 GENERAL INITIALIZATION

Four pins of the STR71x are used:

■

the MOSI pin (Master Output Slave Input).

■

the MISO pin (Master Input, Slave Output).

■

the SCLK clock pin.

■

the SS slave select pin.

The MOSI, MISO and SCLK pins must be initialized as Push-Pull (please refer to the Refer-

ence Manual).

3.2 BSPI CONFIGURATION

The peripheral is configured as a master by using function BSPI_MasterEnable, and the Baud

Rate is fixed by using function BSPI_ClockDividerConfig (please refer to the STR71x Soft-

ware Library User Manual for more information).

3.2.1 EXAMPLE

Then the baud rates must be selected. We should always have the same baud rates in the PC

and in the BSPI.

Baud Rate

Clock Divider

19200

0xCF

38400

0x67

57600

0x40

115200

0x20