Recent content by Fredrik O

Patches and wiring: https://github.com/Fantasyfred/HeaterMeter-and-HLK-RM04

Jeff, It should be possible to use the Uno as stand alone. However, I would be careful interfacing it with the HLK-RM04 as the Uno runs at 5V and the HLK-RM04 logics runs at 3.3 V. Furthermore, the 3.3 V version of the Arduino Pro Mini operates at 8 MHz which makes it necessary to recompile the...

Changed image sizes, from small to gigantic, I'm aparently unable to stay in between:)

I've put together a light version of the Heatermeter using an Arduino Pro Mini (3.3 V, 8 MHz) connected to an HLK-RM04 (32 MB) as the wifi interface: Size: 70x50x35 mm (2.8X2.0x1.4 inch) Full Heatermeter 4.0 functionality except what is noted below Full Linkmeter wifi interface including AVR...

It needs 1min15s for a firmware update, so the speed is reasonable. I've basically taken the gpio-bitbang code straight from avrdude 6.0.1 (the "linuxgpio" mode) and it is based on the sysfs interface. Now when it is up and running, the HLK-RM04 seems to do the trick quite well although the...

I have added some functionality to hmdude (basically a new version of the spi_transaction function and some initialization stuff) such that it is now possible to use it with the four exposed gpios (0, 1, 2, 14) of the HLK-RM04. The AVR firmware upgrade works flawlessly from within linkmeter!

The combined uartf/gpio mode is now working, done by patching the pinctrl driver pinctrl-rt2880.c: /* mark the pins as gpio */ for (i = 0; i < p->groups[group].func[0].pin_count; i++) p->gpio[p->groups[group].func[0].pins[i]] = 1; - } else { + } + /* combined uartf and gpio function */...

Yes, sysupgrade works fine when openwrt is up and running. The bootloader must be replaced from start and when loading the first openwrt image, I know of no other way than via tftp. I'm currently trying to push the RT5350 into the combined uartf/gpio mode such that it would be possible to...

And the solution to the unexport bug can be found in the openwrt ticket #14309: https://dev.openwrt.org/ticket/14309 Avrdude now works great from within Heatermeter.

Yes, flashing the AVR works fine replacing hmdude with avrdude! Besides adjusting the options in avrupdate, I had to disable part of avrdude's exit routine where it performs an unexport of the gpios. Apparently, there is a bug on the openwrt side when unexporting gpios on the RT5350. It is not...

An update: On the 32M hlk-rm04 I have now used avrdude-6.0.1 in linuxgpio mode to flash the atmega. Due to the limited number of exposed gpio pins on the hlk, I had to sacrifice the uartf, meaning that there is just one physical serial port, and use those pins as gpio. The gpio configuration is...

Further testing the HLK-RM04, 32M RAM, with Linkmeter/Heatermeter: It works fine with Heatermeter using wifi and, after patching the linkmeter Makefile to allow for simple wifi-mode switching, it's happily switching between access point and client mode: - if [ "$(CONFIG_TARGET_brcm2708)" =...

I got my HLK-RM04 with 32M RAM from China today. Couldn't wait to test it, so I flashed a new bootloader (uboot256), changed the memory size in HLKRM04.dts file to 32M and remade the image (no other changes relative to my previous post). The result is great: Linkmeter runs flawlessly, even on...

Linkmeter on HLK-RM04, necessary mods: Use Bleeding Edge r39237 and the latest Linkmeter update, including Bryans RT5350 patch linkmeter.uci-defaults, change tty port: SERIAL_DEVICE="/dev/ttyS0" Bryan's install.sh modified such that: #!/bin/sh REPO_PATH=$(pwd) TARGET="$1" WRT_PATH="$2" if [...

Many thanks for the feedback! And the quick linkmeterd patch! I'll be more than happy to share the details when I have worked my way through the busy week I have ahead of me. There's a new version of the HLK-RM04 with 8MB flash and 32MB RAM. I've ordered two units from China, will be here in a...