Re: [Owfs-developers] Non related OWFS help with 1-Wire devices.

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Also comment on what Mick mentioned about power supply  problems.  I 've 
made a kind of ups.   5V 3A regulator IC, driven by a normal switched PS 
12V and  a 12V battery, divided bij Schottky diodes.
But i'm using  a BeageBone Black, a uptime in this way of 2 years is not 
a problem.
i'm using also a watchdog circuit behind the DS2408 for temperature 
runaways.

I did just a refresh/rework of my 1-wire project website: https://fstab.nl
I'm controlling my greenhouse(s) in this way

Nico

Henrik Östman wrote:
> Hi!
> I have been following the OWFS project for 20+ years and I really 
> think it's a marvelous piece of software. It's been run on a Raspberry 
> Pi for many years now to control the heating in our house.
> However lately my Raspberry Pi has been more and more unstable, 
> overheating problems, diskfailure, hanging, owserver unexpectedly 
> going down and soo forth. It really got me thinking if my setup is the 
> best approche, my wife and kids should not have to be Unix admins and 
> be able to SSH to my server and restart the Docker container with 
> Owserver just to not freeze when I'm out on a business trip! So in a 
> true Unix spirit I'm splitting my Home automation system appart into 
> well defined pieces that "do one thing and do it well".
> My house is heated by water-based floor heating, and there are three 
> floor heating control centers, with relays opening and closing the 
> water-valves. Each control center has a DS2408 controlling the relayes 
> of 3-5 valves. A made a small circuit board with a commonly used 
> Arduino compatible microcontroller that reads the temperature in the 
> rooms using DS1820 sensors, then instructs the DS2408 to open/close 
> the right valve. There is one circuit board for each control center, 
> so if one goes down only a few rooms get affected. There is a 
> reset-button on each circuit board that could be used to restart it 
> for whatever reason, and since there are no filesystems mounted there 
> is no problem with corruption in case of power loss, and restarting 
> only takes a second. The Raspberry Pi is now only used for plotting 
> graphs, MQTT and other home automation tasks.
>
> Since I no longer use Owserver in my setup, I understand that it may 
> be inappropriate to ask for help within this forum. But I know that 
> there are some 10+ years skilled developers here with deep knowledge 
> of 1-Wire systems so I'm still going to pop the questions, maybe you 
> could direct me to a more suitable forum where we could continue the 
> discussion?
>
>  The problem I'm having is with the DS2408 devices, I only seem to be 
> able to communicate with them using the SKIP-ROM command, if I try to 
> address them individually then I only get garbage and errors back. The 
> same code works great when addressing DS2423 and DS18(B/S)20 devices, 
> so I think the code itself should work. Maybe I have missed something 
> when communicating or initializing the DS2408? I tried to read all the 
> Maxim specs, and it feels like I'm doing everything right. During 
> startup I begin with initializing the DS2408 and set the pins to 
> output and to a known state.
>
> void ds2408_reset(DS2480B &ds, onewireNode &node) {
> ESP_LOGD(TAG, "Reset DS2408, id: %s.", node.idStr.c_str());
> if (existTestMode(ds, node)) {
> // Configure RSTZ as STRB output.
> //ds.select(node.id <http://node.id>); // reselect last selected device.
> ds.write(SKIP_ROM);// HACK, this select all devices on the bus, but we 
> should select only this single device. Though I get CRC-errors using 
> above line.
> ds.write(0xCC);// Issue Write Conditional Search Register command
> ds.write(0x8D);// TA1, target address = 8Dh
> ds.write(0x00);// TA2, target address = 008Dh
> ds.write(0x04);// Write byte to Control/Status Register, RSTZ as STRB 
> output
> // Verify configuration setting
> if (!ds.reset()) {
> ESP_LOGW(TAG, "Reset DS2408 failed after non-success configure RSTZ as 
> STRB.");
> node.errors++;
> return;
> }
> ds.write(RESUME);// reselect last selected device.
> ds.write(0xF0);// Issue Read PIO Registers command
> ds.write(0x8D);// TA1, target address = 8Dh
> ds.write(0x00);// TA2, target address = 008Dh
> auto status = ds.read();// Read Control/Status Register and verify
> ESP_LOGD(TAG, "DS2408 verify configuration setting: %s.", 
> String(status, HEX));
> // Set all relays off.
> setState(ds, node, B11111111);
> } else {
> ESP_LOGW(TAG, "Reset DS2408 failed for id: %s.", node.idStr.c_str());
> }
> }
>
> /**
> * Exit test-mode.
> * "The DS2408 is sensitive to the power-on slew rate and can 
> inadvertently power up with a test mode
> * feature enabled. When this occurs, the P0 port does not respond to 
> the Channel Access Write command."
> * @return0=failed, 1=success
> */
> bool existTestMode(DS2480B &ds, onewireNode &node) {
> // RST PD 96h <64-bit DS2408 ROM Code> 3Ch RST PD
> if (ds.reset()) {// onewire initialization sequence, to be followed by 
> other commands
> ds.write(0x96);
> for (uint8_t i = 0; i < 8; i++) {
> ds.write(node.id[i]);
> }
> ds.write(0x3C);
> if (ds.reset()) {
> return 1;
> }
> }
> return 0;
> }
>
> int16_t setState(DS2480B &ds, onewireNode &node, uint8_t state) {
> if (node.id[0] != DS2408) {
> ESP_LOGW(TAG, "Device is not a DS2408!");
> return -1;
> }
> if (ds.reset()) {// onewire initialization sequence, to be followed by 
> other commands
> ESP_LOGD(TAG, "Set DS2408 state to: %s.", String(state, BIN));
> uint8_t retries = MAX_CONSECUTIVE_RETRIES;
> //ds.select(node.id <http://node.id>); // issues onewire "MATCH ROM" 
> address which selects a SPECIFIC (only one) 1-Wire device
> ds.write(SKIP_ROM);// HACK, this select all devices on the bus, but we 
> should select only this single device. Though I get CRC-errors using 
> above line.
> do {
> ds.write(0x5A);// Issue Channel-access Write command
> ds.write(state);// Write byte to PIO
> ds.write(~state);// Write inverted byte to PIO
> auto status = ds.read();// Read for verification (AAh = success)
> auto newState = ds.read();// DS2408 samples PIO pin status
> if (status == 0xAA) {// AAh = success
> ESP_LOGD(TAG, "DS2408 current state: %s.", String(newState, BIN));
> node.success++;
> return newState;
> } else {
> node.errors++;
> ESP_LOGW(TAG, "DS2408 setState failed, trying again...");
> if (ds.reset()) {
> ds.write(RESUME);// reselect last selected device.
> } else {
> ESP_LOGW(TAG, "Reset DS2408 failed after non-success setState.");
> node.errors++;
> return -1;
> }
> }
> } while (--retries);
> return -1;
> } else {
> ESP_LOGW(TAG, "Reset DS2408 failed.");
> node.errors++;
> return -1;
> }
> }
>
> When using "ds.select(node.id <http://node.id>);" it does not work, 
> with "ds.write(SKIP_ROM) it works better, the question is why? And if 
> it does matter, the circuit-board is using a DS2480 to communicate 
> with the other devices.
>
> Any help or suggestions would be more than welcome!
> Thanks!
>
> // Henrik
>
>
>
>
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Re: [Owfs-developers] Non related OWFS help with 1-Wire devices.

Project moved to https://github.com/owfs/owfs/

Re: [Owfs-developers] Non related OWFS help with 1-Wire devices.