.gitignore

@@ -3,5 +3,3 @@ secrets.yaml
 .esphome/
 dist/
 __pycache__/
-build/
-tmp.*

atoms3_lite.yaml

@@ -39,7 +39,7 @@ update:
   - platform: http_request
     id: auto_update
     source: "https://juju.nz/michaelh/assets/esphome/${project_name}.json"
-    update_interval: 4hours
+    update_interval: 2min
 
 interval:
   - interval: 50s

interceptor/CMakeLists.txt

@@ -1,6 +0,0 @@
-cmake_minimum_required(VERSION 3.13.1)
-find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-
-project(app LANGUAGES CXX)
-
-target_sources(app PRIVATE src/main.cc)

interceptor/README.md

@@ -1,8 +0,0 @@
-# Interceptor
-
-A passive digital signal sampler for the CH32V003. Tracks the levels of PC1 and PC2 and sends any
-changes over serial to the host. These can be converted to a VCD format file and analyzed in
-sigrock.
-
-Designed for sniffing I2C traffic. PC1 and PC2 are 5 V tollerant and have pullups enabled. Tested at
-up to 200 kHz.

interceptor/boards/wch_ch32v003evt.overlay

@@ -1,48 +0,0 @@
-#include <zephyr/dt-bindings/pinctrl/ch32v003-pinctrl.h>
-
-/ {
-	chosen {
-		zephyr,console = &usart1;
-		zephyr,shell-uart = &usart1;
-	};
-
-	leds {
-		compatible = "gpio-leds";
-
-		red_led: led0 {
-			gpios = <&gpioa 1 GPIO_ACTIVE_HIGH>;
-		};
-
-		scl_pin: scl_pin {
-			gpios = <&gpioc 2 GPIO_PULL_UP>;
-		};
-
-		sda_pin: sda_pin {
-			gpios = <&gpioc 1 GPIO_PULL_UP>;
-		};
-	};
-
-	aliases {
-		led0 = &red_led;
-		scl = &scl_pin;
-		sda = &sda_pin;
-	};
-};
-
-&pinctrl {
-};
-
-&gpioa {
-	status = "okay";
-};
-
-&gpioc {
-	status = "okay";
-};
-
-&usart1 {
-	status = "okay";
-	current-speed = <460800>;
-	pinctrl-0 = <&usart1_default>;
-	pinctrl-names = "default";
-};

interceptor/prj.conf

@@ -1,25 +0,0 @@
-# Trim back the memory usage.
-CONFIG_THREAD_STACK_INFO=n
-CONFIG_ERRNO=n
-CONFIG_CURRENT_THREAD_USE_TLS=n
-CONFIG_TIMESLICING=n
-CONFIG_KERNEL_MEM_POOL=n
-CONFIG_COMMON_LIBC_MALLOC=n
-CONFIG_MINIMAL_LIBC=y
-CONFIG_CBPRINTF_NANO=y
-CONFIG_CBPRINTF_REDUCED_INTEGRAL=y
-CONFIG_CBPRINTF_N_SPECIFIER=n
-
-CONFIG_WCH_CH32V00X_HSI=y
-CONFIG_WCH_CH32V00X_HSE=n
-CONFIG_WCH_CH32V00X_HSI_AS_PLLSRC=y
-
-CONFIG_GPIO=y
-CONFIG_SERIAL=y
-CONFIG_CONSOLE=y
-CONFIG_UART_CONSOLE=y
-
-CONFIG_CPP=y
-CONFIG_STD_CPP2B=y
-
-CONFIG_MAIN_STACK_SIZE=1024

interceptor/src/main.cc

@@ -1,88 +0,0 @@
-/*
- * Copyright (c) 2024 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <zephyr/drivers/gpio.h>
-#include <zephyr/kernel.h>
-
-#include <ch32_gpio.h>
-#include <ch32_uart.h>
-
-namespace
-{
-
-constexpr struct gpio_dt_spec kLed = GPIO_DT_SPEC_GET(DT_ALIAS(led0), gpios);
-constexpr struct gpio_dt_spec kScl = GPIO_DT_SPEC_GET(DT_ALIAS(scl), gpios);
-constexpr struct gpio_dt_spec kSda = GPIO_DT_SPEC_GET(DT_ALIAS(sda), gpios);
-
-void sniff()
-{
-	GPIO_TypeDef *port = GPIOC;
-	USART_TypeDef *uart = USART1;
-	uint8_t fifo[256];
-	int head = 0;
-	int tail = 0;
-
-	// Note that using `int` reduces the code size by removing unneeded truncation.
-	int samples = 0;
-	int sample_count = 0;
-	int last_sample = 0;
-	int unchanged_for = 0;
-
-	csr_clear(mstatus, MSTATUS_IEN);
-
-	for (;;) {
-		static_assert(kScl.port == kSda.port);
-		static_assert(kScl.pin == kSda.pin + 1);
-		int sample = (port->INDR >> kSda.pin) & 3;
-
-		// Record when the value changes, or the value has been unchanged for some time.
-		if (sample != last_sample || ++unchanged_for >= 1024) {
-			samples <<= 2;
-			samples |= sample;
-			last_sample = sample;
-			unchanged_for = 0;
-
-			if (++sample_count >= 3) {
-				// Encode the three samples into valid ASCII.
-				fifo[head++] = samples + ' ';
-				head %= sizeof(fifo);
-				samples = 0;
-				sample_count = 0;
-			}
-		}
-		if (tail != head && (uart->STATR & USART_STATR_TXE) != 0) {
-			uart->DATAR = fifo[tail++];
-			tail %= sizeof(fifo);
-
-			if (tail == 0 && (uart->STATR & USART_STATR_RXNE) != 0 &&
-			    uart->DATAR == '~') {
-				break;
-			}
-		}
-	}
-
-	csr_set(mstatus, MSTATUS_IEN);
-}
-
-void interceptor()
-{
-	gpio_pin_configure_dt(&kLed, GPIO_OUTPUT_ACTIVE);
-	gpio_pin_configure_dt(&kScl, GPIO_INPUT);
-	gpio_pin_configure_dt(&kSda, GPIO_INPUT);
-
-	for (;;) {
-		printk("sniff\n");
-		sniff();
-	}
-}
-
-} // namespace
-
-int main(void)
-{
-	interceptor();
-	return 0;
-}

interceptor/tovcd.py

@@ -1,49 +0,0 @@
-"""Converts the samples from the board to a VCD file for sigrok.
-
-Usage:
-   python3 tovcd.py < /dev/ttyUSB0 | tee log.vcd
-"""
-
-import datetime
-import sys
-
-_HEADER = """
-$date {date} $end
-$version juju.nz tovcd.py $end
-$timescale 1 us $end
-$scope module libsigrok $end
-"""
-
-_MID = """
-$upscope $end
-$enddefinitions $end
-"""
-
-_IDS = "!#$%&'()"
-
-
-def main():
-    print(_HEADER.strip().format(date=datetime.datetime.now()))
-
-    for wire in range(2):
-        print(f"$var wire 1 {_IDS[wire]} D{wire} $end")
-
-    print(_MID.strip())
-
-    now = 0
-    last_d = None
-
-    for ch in sys.stdin.read():
-        ch = ord(ch) - 32
-        for i in range(3):
-            now += 1
-            d = (ch >> 5) & 1, (ch >> 4) & 1
-            ch <<= 2
-            if d != last_d:
-                parts = (f"{x}{_IDS[i]}" for i, x in enumerate(d))
-                print(f"#{now}", " ".join(parts))
-                last_d = d
-
-
-if __name__ == "__main__":
-    main()