libopencm3/examples/stm32/f1/lisa-m-2/spi/README

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README
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This example program demonstrates simple SPI transceive on Lisa/M 2.0 board
(http://paparazzi.enac.fr/wiki/Lisa/M_v20 for details).
The terminal settings for the receiving device/PC are 9600 8n1.
The example expects a loopback connection between the MISO and MOSI pins on
SPI1.
A counter increments and the spi sends this byte out, after which it should
come back in to the rx buffer, and the result is reported on the uart.