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Sam Ho
Associate II


I am looking to prototype a project. I will need I2C, SPI and UART.  I2C for some ST sensors/gas gauge, SPI for sd card and UART for RS485.  Is it possible to use SPBTLE-1S, to run both host applications and bluetooth.  

Thanks for your help

Sam Ho
Associate II

I am slightly confused by the datasheet.

The GPIOs can they be set at different modes. For example, can i set module pin 3/4 for UART_RX and TX, (mode 001) and at the same time use module pin 15, 16, 17, 18 for SPI (mode 100)

Thanks you

Winfred LU
ST Employee

Hi Sam,

Yes, it is possible.

Register MODE0 (offset 0x2C) is for IO0 - IO7, so to configure

  1. pin 3 (DIO4) and pin 4 (DIO5) to function UART (Mode 001) and
  2. pin 15 - 18 (DIO0 - DIO3) to function SPI (MOde 100)

please set MODE0 as below

set MODE0 = 0x00114444

Best Regards,