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[README] Renamed all readme files to indicate markup format.

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Piotr Esden-Tempski
2015-01-19 19:19:42 -08:00
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examples/stm32/f1/lisa-m-2/spi_dma_adv/README.md Normal file
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README
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This example program demonstrates SPI transceive with DMA 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. The DRDY and SS pins (on the Lisa/M v2.0 SPI1 connector) are used as
GPIO to time the tx and rx ISRs, respectively. Use a scope or logic analyzer.
The tx length is incremented, followed by the rx length, after which the tx is
decremented, then the rx is decremented. This is repeated in a loop. In this
example, rx lengths longer than tx lengths are handled by using two dma transmits
one after the other, handled inside the tx dma ISR.