topic Re: TWR-K20D50M as SPI Slave over TWRPI? in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/TWR-K20D50M-as-SPI-Slave-over-TWRPI/m-p/353456#M17563 <HTML><HEAD></HEAD><BODY><P>Hi Doug Hecker,</P><P></P><P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PTD0 is not connect with J3 now, actually, you can choose PTC4_UART_TX instead of PTD0, the function of pin PTC4&nbsp; is PTC4/LLWU_P8/SPI0_PCS0/UART1_TX/FTM0_CH3/CMP1_OUT, it also have SPI0_PCS0 function. This pin is connect with J1 pin2 . You can use one wire connect with the CS of your SPI master chip.</P><P>&nbsp;&nbsp;&nbsp; About how to configure it as the slave, you should follow these steps:</P><P>1. Configure the SPI pins function in the PORT register. choose the right pin mux.</P><P>2. Enable the SPI clock gate in SIM register : set SIM_SCGC6[SPI0]</P><P>3. Configure your K20 as SPI slave, clear SPIx_MCR[MSTR]</P><P>4 . configure the slave Clock Polarity&nbsp; and Clock Phase in register SPIx_CTAR_SLAVE the same with your master.</P><P>Wish it helps you!</P><P>If you still have problem, please contact me!</P><P></P><P><BR />Have a great day,</P><P>Jingjing</P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Mon, 09 Feb 2015 12:29:11 GMT kerryzhou 2015-02-09T12:29:11Z TWR-K20D50M as SPI Slave over TWRPI? https://community.nxp.com/t5/Kinetis-Microcontrollers/TWR-K20D50M-as-SPI-Slave-over-TWRPI/m-p/353455#M17562 <HTML><HEAD></HEAD><BODY><P><SPAN style="font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">Is the TWRPI connector J3 pin 11 on the </SPAN><SPAN style="font-size: 10pt; font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; color: #3d3d3d;">TWR-K20D50M suppose to be PTD0/DSPI0_PCS0, and not connected to pin J3-20 (PTD4/DSPI0_PCS1)?&nbsp; Without access to DSPI0_PCS0 on the TWRPI connector, the TWR-K20D50M can't be configured as an SPI Slave can it?&nbsp; If I have a TWRPI device that must be the SPI Master, please share (if there's a way) how I can configure the TWR-K20D50M to be an SPI Slave (using SPI over the TWRPI of course).&nbsp; The hope was to use J3-20 (or other GPIO) as an SPI interrupt to let the SPI Master know the TWR-K20D50M (in SPI Slave mode) had data to send, and the Master then use PCS0/SS as the Slave Select.</SPAN></P></BODY></HTML> Tue, 12 Aug 2014 18:35:00 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/TWR-K20D50M-as-SPI-Slave-over-TWRPI/m-p/353455#M17562 dhecker 2014-08-12T18:35:00Z Re: TWR-K20D50M as SPI Slave over TWRPI? https://community.nxp.com/t5/Kinetis-Microcontrollers/TWR-K20D50M-as-SPI-Slave-over-TWRPI/m-p/353456#M17563 <HTML><HEAD></HEAD><BODY><P>Hi Doug Hecker,</P><P></P><P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PTD0 is not connect with J3 now, actually, you can choose PTC4_UART_TX instead of PTD0, the function of pin PTC4&nbsp; is PTC4/LLWU_P8/SPI0_PCS0/UART1_TX/FTM0_CH3/CMP1_OUT, it also have SPI0_PCS0 function. This pin is connect with J1 pin2 . You can use one wire connect with the CS of your SPI master chip.</P><P>&nbsp;&nbsp;&nbsp; About how to configure it as the slave, you should follow these steps:</P><P>1. Configure the SPI pins function in the PORT register. choose the right pin mux.</P><P>2. Enable the SPI clock gate in SIM register : set SIM_SCGC6[SPI0]</P><P>3. Configure your K20 as SPI slave, clear SPIx_MCR[MSTR]</P><P>4 . configure the slave Clock Polarity&nbsp; and Clock Phase in register SPIx_CTAR_SLAVE the same with your master.</P><P>Wish it helps you!</P><P>If you still have problem, please contact me!</P><P></P><P><BR />Have a great day,</P><P>Jingjing</P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Mon, 09 Feb 2015 12:29:11 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/TWR-K20D50M-as-SPI-Slave-over-TWRPI/m-p/353456#M17563 kerryzhou 2015-02-09T12:29:11Z