topic SSP driver: Why tx- and rx-counters not initilized to zero? in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/SSP-driver-Why-tx-and-rx-counters-not-initilized-to-zero/m-p/586209#M21403 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by 1234567890 on Sun Jun 08 03:55:27 MST 2014</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I'm just playing with the SSP driver for a LPCXPresso LPC11C24. The function Chip_SSP_RWFrames_Blocking(...)</SPAN><BR /><SPAN>uses the </SPAN><BR /><SPAN>xf_setup.tx_cnt and xf_setup.rx_cnt</SPAN><BR /><SPAN>counters for proper work. Therefore it's </SPAN><STRONG>allways</STRONG><SPAN> neccessary to reset both counters to zero at the entrance of each call (at least I think so).</SPAN><BR /><SPAN>So why isn't that mandatory initialisation done in the driver and has to be done manually?</SPAN><BR /><BR /><SPAN>Btw.: The SSP of the CM0 seems not that compatible/usefull in slave mode when using SPI mode 0: When back-to-back writing after each word the SSEL has to be set to inactive state. That's really bad.</SPAN></BODY></HTML> Wed, 15 Jun 2016 20:25:07 GMT lpcware 2016-06-15T20:25:07Z SSP driver: Why tx- and rx-counters not initilized to zero? https://community.nxp.com/t5/LPC-Microcontrollers/SSP-driver-Why-tx-and-rx-counters-not-initilized-to-zero/m-p/586209#M21403 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by 1234567890 on Sun Jun 08 03:55:27 MST 2014</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I'm just playing with the SSP driver for a LPCXPresso LPC11C24. The function Chip_SSP_RWFrames_Blocking(...)</SPAN><BR /><SPAN>uses the </SPAN><BR /><SPAN>xf_setup.tx_cnt and xf_setup.rx_cnt</SPAN><BR /><SPAN>counters for proper work. Therefore it's </SPAN><STRONG>allways</STRONG><SPAN> neccessary to reset both counters to zero at the entrance of each call (at least I think so).</SPAN><BR /><SPAN>So why isn't that mandatory initialisation done in the driver and has to be done manually?</SPAN><BR /><BR /><SPAN>Btw.: The SSP of the CM0 seems not that compatible/usefull in slave mode when using SPI mode 0: When back-to-back writing after each word the SSEL has to be set to inactive state. That's really bad.</SPAN></BODY></HTML> Wed, 15 Jun 2016 20:25:07 GMT https://community.nxp.com/t5/LPC-Microcontrollers/SSP-driver-Why-tx-and-rx-counters-not-initilized-to-zero/m-p/586209#M21403 lpcware 2016-06-15T20:25:07Z