AN2737

IAP example with SPI

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The following points explain how to read different bytes using the Aardvark software:

1.

Select the master tabsheet.

2.

Set the bitrate to 4000 kHz using the ‘bitrate’ field and the ‘set’ button.

3.

Select the polarity as rising/falling.

4.

Select the phase as sample/setup.

5.

Set the bit order to MSB.

6.

Set the SS pin as active low (Aardvark SS pin is connected to the STM8 NSS).

7.

For example, enter the following sequence: 03 00 40 00 00 00 00 00 00 00 00. The

value 03 sets the ‘read’ flag. The three bytes 00, 40, and 00 are the ‘read start

address’. The seven ‘00’ bytes correspond to the number of bytes to be read.

8.

Press the ‘send’ button.

Figure 11 illustrates the different steps entered on the Aardvark software.

Figure 11.

Reading bytes using the Aardvark software

Figure 12 shows the read values displayed in the transaction log window of the Aardvark

software.

Figure 12.

Read values of the Aardvark software