diff options
Diffstat (limited to '_site/log')
| -rw-r--r-- | _site/log/etlas/index.html | 30 |
1 files changed, 13 insertions, 17 deletions
diff --git a/_site/log/etlas/index.html b/_site/log/etlas/index.html index 9362917..f618503 100644 --- a/_site/log/etlas/index.html +++ b/_site/log/etlas/index.html @@ -54,20 +54,18 @@ DHT22 sensor.</p> </tr> </table> -<p>Stocks: Two weeks EOD prices from Polygon.io (max SRAM holds). Flask app on VPS -relays feed, lets me swap symbols via config. FastCGI + httpd + htpasswd.</p> +<p>Stocks: Two weeks EOD prices from Polygon.io (max possible). Flask app on VPS +relays feed; manages watchlist. Backend: httpd + htpasswd + FastCGI + Flask.</p> -<p>gui_plot_stocks() triggers WDT. vTaskDelay() prevents that. Stepped graph was -easier to code for the bit-packed framebuffer (not enough memory for much -else), but it’s messy–too messy.</p> - -<p>Note to self: Refactor gui_plot_stocks(). Bresenham’s line algorithm perhaps?</p> +<p>gui_plot_stocks() triggers watchdog; vTaskDelay() required. Stepped graph was +easier to implement (under memory constraints), but the logic is hideous. Note +to self: Refactor with Bresenham’s?</p> <p>News: Channel NewsAsia RSS. MCU parses XML directly. Character glyphs stored as -bitmaps in sprites directory.</p> +bitmaps in header files.</p> -<p>Weather: DHT22 via PWM. 26µs/50µs/70µs pulses too fast for standard ESP32 APIs. -Compare relative pulse widths:</p> +<p>Weather: DHT22 single-wire protocol. 26µs/50µs/70µs pulses are too fast for +standard ESP32 APIs. Bit-banged relative pulse widths: (Ported from <a href="https://github.com/Fonger/ESP8266-RTOS-DHT" class="external" target="_blank" rel="noopener noreferrer">ESP8266</a>):</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>static inline int dht_await_pin_state(int state, int timeout) { @@ -124,14 +122,12 @@ static inline int dht_get_raw_data(unsigned char buf[BUFLEN]) } </code></pre></div></div> -<p>Ported from <a href="https://github.com/Fonger/ESP8266-RTOS-DHT" class="external" target="_blank" rel="noopener noreferrer">ESP8266</a>.</p> - -<p>After flashing new versions, display would stop responding. Didn’t observe this -with e-reader. Issue occurs spontaneously. Couldn’t find root cause. Making a -change like adding a comment or tweaking delay in refresh() (then changing -back) fixed it. Noisy electrical connections?</p> +<p>Ghost in the machine: epd_init() stalls intermittently on first refresh() after +flash. Toggling delay values in refresh() resolves it. If first refresh +succeeds, it remains stable. Root cause unknown–suspected power supply issues +from powering display via MCU.</p> -<p>Once running, it runs: August 2024 - December 2025.</p> +<p>Uptime: August 2024 - January 2026</p> <p>Commit: <a href="https://git.asciimx.com/etlas/commit/?id=a92c86ac1592c2137d3d1fec1668eacc2d0ca581">a92c86a</a></p> |