MQX Software SolutionsのトピックRe: MQX Dspi

MQX Dspi

Garil — Thu, 05 Jan 2012 17:20:40 GMT

Hi folk, i have the kenetis demoboard twr53 also new in this mcu

i m trying using the spi2 on my board with an external chip which is active when the cs is high, in other way i m using the ioctl cmd ( IO_IOCTL_SPI_READ_WRITE) which auto assert the chip. __________

can someone please tell me how i can assert the chip "high" ? not low e.g not __ __ but __| |__

|________|

Please look at the wave form if what i wrote not clear

thx in advance

Re: MQX Dspi

Garil — Fri, 06 Jan 2012 07:55:22 GMT

Sorry guys, just wanted to give u my configuration

MQX 3.7, Codewarrior 10.1 pro, twr53n512 the 53 demoboard

thx

Re: MQX Dspi

BryGuyH — Fri, 06 Jan 2012 08:22:47 GMT

Like a lot of parts of MQX the drivers often don't allow configuration of low level chip features. In this case the DSPI module driver for the kinetis chip set:

dspi_ptr->MCR |= DSPI_MCR_PCSIS(0xFF);

in the _dspi_polled_init function of the BSP. So you can either modify that for your application or else come back through after you do the fopen for the spi channel you are using and manually modify the SPIx_MCR register.

Re: MQX Dspi

Garil — Fri, 13 Jan 2012 17:36:01 GMT

many thx, sorry for the delay