http://forums.leaflabs.com/topic.php?id=1072 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:24:14 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=1072#post-6595 Sun, 25 Sep 2011 16:05:00 +0000 gulu2065 6595@http://forums.leaflabs.com/ <p>Hey, I am trying to read some data from a chip. I use SPI. But it seems overflow. My speed is 2Mhz. I need to store 16224 bit. I guess I need to use DMA, But I have no idea about it.<br /> How could I use it?<br /> Here is my code.<br /> #include &lt;SPI.h&gt;<br /> int i=0;<br /> void setup() {<br /> pinMode (50, OUTPUT);<br /> pinMode (52, OUTPUT);<br /> SPI.begin();<br /> SPI.setBitOrder(MSBFIRST);<br /> SPI.setClockDivider(SPI_CLOCK_DIV2);<br /> SPI.setDataMode(SPI_MODE1);<br /> }</p> <p>void loop() {<br /> SPI.transfer(9);<br /> SPI.transfer(0);<br /> }<br /> And this is the code for Maple to read data<br /> HardwareSPI spi(1);<br /> int i;<br /> void setup() {<br /> spi.beginSlave(MSBFIRST, 1);<br /> }<br /> void loop() {<br /> byte response = spi.read();<br /> SerialUSB.println(response, BIN);<br /> }</p> <p>Thanks, </p>