Nice setup Nico! And a useful watchdog for the DS2408, thanks for sharing the schematics! I'm still struggling with my implementation, resetting the microcontroller will get the DS2480 out of sync somehow, and the only way to get back on track is to powercycle the beast. I have tried to send a master control reset to the DS2480, but it doesn't seem to work, the chip is notoriously hard to reset.
So I threw the circuit away and have ordered a new PCB based upon the DS2484(I2C), hopefully it works better than the serial DS2480, at least it requires less external components and a reset is only a I2C-instruction away. :-) Crossing my fingers that this one works better... // Henrik Den tors 8 okt. 2020 kl 10:30 skrev Nico Bouthoorn <n...@cuora.nl>: > 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); // 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." > * @return 0=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); // 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);" 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 > > > > > _______________________________________________ > Owfs-developers mailing > listOwfs-developers@lists.sourceforge.nethttps://lists.sourceforge.net/lists/listinfo/owfs-developers > > >
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