http://forums.leaflabs.com/topic.php?id=1250 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:26:09 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=1250#post-7568 Wed, 11 Jan 2012 12:40:22 +0000 mbolivar 7568@http://forums.leaflabs.com/ <p>I've never needed to do this, so I don't know for sure. Have you tried turning the peripheral off and on? </p> http://forums.leaflabs.com/topic.php?id=1250#post-7477 Sun, 01 Jan 2012 11:00:15 +0000 ihkim 7477@http://forums.leaflabs.com/ <p>I am using Maple r5 board.</p> <p>I set the board as SPI Slave and uses DMA to receive and send data.<br /> Most of time Command comes from Master and Slave responses.</p> <p>So I made code to wait for receiving Command from Master. Once Command is received, send response back to Master. This approach is working.</p> <p>But, really trouble, rarely, Slave needs to send data itself.</p> <p>In that case, I disable DMA RX, TX buffer and canceled waiting Command.<br /> After that, SPI is reinitiated with DMA RX, and TX buffer with new data to be sent to Mater.</p> <p>When I took a look the signal, the first byte to be sent to Master is always from dummy value from previous waiting Command transaction.</p> <p>Even I canceled waiting Command transaction, 1 byte still remains in TX buffer.<br /> I tried to find a way how to clear TX buffer in STM32F103 reference manual, I couldn't find it.</p> <p>Anybody has any idea how to clear TX buffer? </p>