topic Invert SSEL function of SPI peripheral in LPCXpresso IDE https://community.nxp.com/t5/LPCXpresso-IDE/Invert-SSEL-function-of-SPI-peripheral/m-p/562825#M16873 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by emielzij on Tue Nov 25 02:22:29 MST 2014</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I try to send data to a device that can communicate using the SPI bus.</SPAN><BR /><SPAN>But the SYNC pin on the device is active low. I configured the spi peripheral on the lpc11c24 and did some measurements.</SPAN><BR /><SPAN>The SSEL line becomes high and goes low just before the microcontroller sends the data. But for a correct operations this needs to be inverted.</SPAN><BR /><BR /><SPAN>What is a convenient way to invert the SSEL spi function? I couldn't find a configuration option.</SPAN><BR /><BR /><SPAN>Or should I just pull a pin manually each time?</SPAN></BODY></HTML> Thu, 16 Jun 2016 00:56:21 GMT lpcware 2016-06-16T00:56:21Z Invert SSEL function of SPI peripheral https://community.nxp.com/t5/LPCXpresso-IDE/Invert-SSEL-function-of-SPI-peripheral/m-p/562825#M16873 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by emielzij on Tue Nov 25 02:22:29 MST 2014</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I try to send data to a device that can communicate using the SPI bus.</SPAN><BR /><SPAN>But the SYNC pin on the device is active low. I configured the spi peripheral on the lpc11c24 and did some measurements.</SPAN><BR /><SPAN>The SSEL line becomes high and goes low just before the microcontroller sends the data. But for a correct operations this needs to be inverted.</SPAN><BR /><BR /><SPAN>What is a convenient way to invert the SSEL spi function? I couldn't find a configuration option.</SPAN><BR /><BR /><SPAN>Or should I just pull a pin manually each time?</SPAN></BODY></HTML> Thu, 16 Jun 2016 00:56:21 GMT https://community.nxp.com/t5/LPCXpresso-IDE/Invert-SSEL-function-of-SPI-peripheral/m-p/562825#M16873 lpcware 2016-06-16T00:56:21Z Re: Invert SSEL function of SPI peripheral https://community.nxp.com/t5/LPCXpresso-IDE/Invert-SSEL-function-of-SPI-peripheral/m-p/562826#M16874 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by R2D2 on Tue Nov 25 03:16:57 MST 2014</STRONG><BR /><HR /><SPAN style="color: #0000ff;"><STRONG>Quote: emielzij</STRONG><BR />What is a convenient way to invert the SSEL spi function?</SPAN><HR /><BR /><BR /><SPAN>Hardware&nbsp; :) </SPAN><BR /><BR /><HR /><SPAN style="color: #0000ff;"><STRONG>Quote: emielzij</STRONG><BR />I couldn't find a configuration option.</SPAN><HR /><BR /><BR /><SPAN>There's no option to switch SSEL active high. If you don't want to add an inverter, just use SSEL pin as GPIO and set it manually.&nbsp; </SPAN><BR /><BR /><BR /><BR /><BR /></BODY></HTML> Thu, 16 Jun 2016 00:56:22 GMT https://community.nxp.com/t5/LPCXpresso-IDE/Invert-SSEL-function-of-SPI-peripheral/m-p/562826#M16874 lpcware 2016-06-16T00:56:22Z