Files

Karl Palsson b227e1609c rules: provide default C and C++ standards

Default CSTD to c99, no default for CXXSTD, but if provided it will be used.

Add required gnu99 flags to projects using gnu styles.

2016-08-18 22:41:23 +00:00

Makefile

rules: provide default C and C++ standards

2016-08-18 22:41:23 +00:00

README.md

[README] Coarse sweep to use markup in READMEs.

2015-01-19 19:20:12 -08:00

spi_dma_adv.c

Examples updated to use new rcc_periph_clock_enable function

2014-02-13 19:14:59 +01:00

README.md

README

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.