Date: Sat, 13 Feb 2021 11:17:39 +0100 From: Oskar Holmlund <info@ohdata.se> To: Elwood Downey <elwood.downey@gmail.com> Cc: freebsd-arm@freebsd.org Subject: Re: iic Message-ID: <6bce1918075c99d9ee1ae8242091de2f@ohdata.se> In-Reply-To: <CAL98DL5mAreMfwQRDVo11nT5j3=fGpm=4Jno5q8uDx7P9NQ4Ww@mail.gmail.com> References: <CAL98DL5mAreMfwQRDVo11nT5j3=fGpm=4Jno5q8uDx7P9NQ4Ww@mail.gmail.com>
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Hi Elwood, 2021-02-13 03:02 skrev Elwood Downey: > Hello all! > > Trying IIC on RPi 4b 4GB, no joy yet. Looking for ideas. So far: > > - bus seems to be present based on dmesg and /dev/iic0 (see below) > - device is BME280 <https://www.adafruit.com/product/2652>; env > sensor at > IIC address 0x77. > - wiki page here <https://wiki.freebsd.org/arm/Raspberry%20Pi>; > suggests > it should work. > - The table says "OK (brcm BSC)" but not sure what that extra bit > means. > - Tried all the kernels mentioned on that page with no luck so > decided > on some 13-BETAs, still no luck. > - Device is known to work on the same hardware running Raspbian 10 > "buster". > - tried the I2CRDWR-only test program here > > <https://vzaigrin.wordpress.com/2014/04/28/working-with-i2c-in-freebsd-on-raspberry-pi/>; > but that does not find my device either > > Suggestions welcome! > > adTHANKSvance > > Elwood Downey > Tucson AZ > > > freebsd@generic:~ % dmesg | grep iic > iichb0: <BCM2708/2835 BSC controller> mem 0x7e804000-0x7e804fff irq 26 > on > simplebus0 > iicbus0: <OFW I2C bus> on iichb0 > iic0: <I2C generic I/O> on iicbus0 > > freebsd@generic:~ % uname -a > FreeBSD generic 13.0-BETA2 FreeBSD 13.0-BETA2 #0 > releng/13.0-n244498-6461715f1ae: Fri Feb 12 06:21:00 UTC 2021 > root@releng1.nyi.freebsd.org:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC > arm64 > > freebsd@generic:~ % ls -l /dev/iic0 > crw------- 1 root wheel 0x45 Feb 12 07:01 /dev/iic0 > > freebsd@generic:~ % sudo i2c -s > Hardware may not support START/STOP scanning; trying less-reliable read > method. > Scanning I2C devices on /dev/iic0: <none found> > _______________________________________________ > freebsd-arm@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" - device is BME280 <https://www.adafruit.com/product/2652>; env sensor at IIC address 0x77. Are you using the "STEMMA QT" interface or have you done the wiring? If you did the wiring, how? I dont have any RPI to try myself. But i do have an pocketbeagle with a mikroe weather click: https://www.mikroe.com/weather-click # i2c -s -f /dev/iic1 Hardware may not support START/STOP scanning; trying less-reliable read method. Scanning I2C devices on /dev/iic1: 76 In my case I need to apply an device tree overlay[1] to get the i2c1 to work, not sure if its needed for RPI. You may check your running devicetree: # sysctl -b hw.fdt.dtb | dtc -I dtb -O dts > running.dts I have written a driver for bme280 that I can share after cleaning up. [1] devicetree overlay for AM3358 (Pocketbeagle, Beagleboneblack:ish ...) https://github.com/RobertCNelson/bb.org-overlays/blob/master/src/arm/PB-I2C1-WEATHER-CLICK.dts With modifications: /* * Copyright (C) 2017 Robert Nelson <robertcnelson@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ /dts-v1/; /plugin/; #include <dt-bindings/board/am335x-bbw-bbb-base.h> #include <dt-bindings/gpio/gpio.h> #include <dt-bindings/pinctrl/am33xx.h> / { fragment@0 { target = <&am33xx_pinmux>; __overlay__ { pb_tl_i2c1_pins: pinmux_pb_tl_i2c1_pins { pinctrl-single,pins = < /* (D15) uart1_txd.i2c1_scl */ AM33XX_IOPAD(0x0984, PIN_OUTPUT_PULLUP | INPUT_EN | MUX_MODE3) /* (D16) uart1_rxd.i2c1_sda */ AM33XX_IOPAD(0x0980, PIN_OUTPUT_PULLUP | INPUT_EN | MUX_MODE3) >; }; }; }; fragment@1 { target = <&i2c1>; __overlay__ { status = "okay"; #address-cells = <1>; #size-cells = <0>; pinctrl-names = "default"; pinctrl-0 = <&pb_tl_i2c1_pins>; bmp280@76 { compatible = "bosch,bme280"; reg = <0x76>; bme280,humidity_oversampling=<1>; bme280,temperature_oversampling=<1>; bme280,pressure_oversampling=<1>; bme280,filter=<0>; bme280,Tstandby=<0>; }; }; }; }; -- Bästa Hälsningar Oskar Holmlund Tel 070-3220292
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