i.MX Processors中的主题 i.MX6 SPI LSB MODE

i.MX6 SPI LSB MODE

浩卢 — Wed, 23 Mar 2016 06:07:11 GMT

root@imx6-luhao:~# ./spidev_flash_tt -D /dev/spidev0.1 -s 1000000 -L

spidev spi0.1: setup: unsupported mode bits 8

can't set spi mode: Invalid argument

Aborted

root@imx6-luhao:~# ./spidev_flash_tt -D /dev/spidev0.1 -s 1000000 --help

./spidev_flash_tt: unrecognized option '--help'

Usage: ./spidev_flash_tt [-DsbdlHOLC3]

-D --device device to use (default /dev/spidev1.1)

-s --speed max speed (Hz)

-d --delay delay (usec)

-b --bpw bits per word

-l --loop loopback

-H --cpha clock phase

-O --cpol clock polarity

-L --lsb least significant bit first

-C --cs-high chip select active high

-3 --3wire SI/SO signals shared

root@imx6-luhao:~# ./spidev_flash_tt -D /dev/spidev0.1 -s 1000000

spi mode: 0

bits per word: 8

max speed: 1000000 Hz (1000 KHz)

Does I.mx6 not support SPI LSB mode?

Re: i.MX6 SPI LSB MODE

Yuri — Wed, 23 Mar 2016 07:15:29 GMT

Hello,

The i.MX6 eCSPI module does not allow to reverse bit order.

Have a great day,
Yuri

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Re: i.MX6 SPI LSB MODE

浩卢 — Thu, 24 Mar 2016 06:00:04 GMT

OK. Tks.Yuri.