AN4494 datasheet(12/34 Pages) STMICROELECTRONICS

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SPI interface

AN4494

SPI interface

3.1

Test case specification identifier

SPI_TEST

3.2

Test prerequisite

The customer's platform should have the SPI test points (see Table 1: "Test points" and

Figure 2: "SPI connection": SPI connection below).

3.3

Test description

How to verify that SPI access from an external microcontroller is functional.

3.4

Test setup

3.4.1

Hardware

STEVAL-IDB002V1 motherboard, to be connected to the BlueNRG board as showed

below:

Figure 2: SPI connection

3.4.2

Software

ST BlueNRG GUI, to send SPI commands to the BlueNRG.

3.5

Test procedure

A BlueNRG hardware reset, performed by the microcontroller, generates an ACI event with

a sequence described below and shown in Figure 3: "BlueNRG SPI transaction on HW

reset":

Release of hardware reset

IRQ goes high to signal an event from BlueNRG (if this signal is not present, it means

that the BlueNRG firmware for some reason is not running)

The external microcontroller lowers CS to access the BlueNRG and read the event

The microcontroller reads 5 bytes from SPI; they should be [02,7F,00,00,00]

The external microcontroller, after raising the CS, lowers it again to access the

BlueNRG and read the event

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AN4494 Datasheet(PDF) 12 Page - STMicroelectronics