eculocate

commit 11f07441cf1126147d1bccd3a8cb63896f80a35a
parent f7e7e0dced293b663ba2d021308793b8be3a9b8b
Author: Daniel Barlow <dan@telent.net>
Date:   Fri, 14 Nov 2025 22:10:56 +0000

write honda k-line init sequence

per the logic analyser, the tx line goes up and down for the requist
number of milliseconds, then it goes up and down some more, faster,
when I send bytes. the first four bytes take ~ 3 seconds, so I guess
that's 10400 baud maybe

Diffstat:
M
src/bin/main.rs
 | 
57
++++++++++++++++++++++++++++++++++++++++++++++++++++-----

1 file changed, 52 insertions(+), 5 deletions(-)
diff --git a/src/bin/main.rs b/src/bin/main.rs
@@ -12,6 +12,7 @@ use esp_hal::{
     timer::timg::TimerGroup,
     gpio::{Level, Output, OutputConfig},
     clock::CpuClock,
+    uart::{Uart,Config,DataBits},
     main,
 };
 // use esp_hal::clock::CpuClock;
@@ -34,7 +35,12 @@ fn main() -> ! {
     esp_println::logger::init_logger_from_env();
 
     let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
-    let peripherals = esp_hal::init(config);
+    let mut peripherals = esp_hal::init(config);
+
+    // XXX what is this for?
+    // apparently it's copyable whatever it is as no complaints
+    // when I call >1 function with it as param
+    let output_config = OutputConfig::default();
 
     esp_alloc::heap_allocator!(#[esp_hal::ram(reclaimed)] size: 66320);
 
@@ -48,14 +54,55 @@ fn main() -> ! {
     let radio_init = esp_radio::init().expect("Failed to initialize Wi-Fi/BLE controller");
     let _connector = BleConnector::new(&radio_init, peripherals.BT, Default::default());
 
-    let mut led = Output::new(peripherals.GPIO0, Level::High, OutputConfig::default());
+    let mut led = Output::new(peripherals.GPIO8, Level::High, output_config);
     led.set_high();
     let delay = Delay::new();
 
+    let tx = peripherals.GPIO21.reborrow();
+
+    let mut output = Output::new(tx, Level::High, OutputConfig::default());
+
+    // this is just so that I can distinguish where my code actually
+    // starts running when I look at the signal analyser
+
+    info!("waiting...");
+    delay.delay_millis(2000);
+    output.set_low();
+    delay.delay_millis(20);
+    output.set_high();
+    delay.delay_millis(2000);
+
+    info!("let's go!");
+
+    output.set_low();
+    delay.delay_millis(70);
+    output.set_high();
+    delay.delay_millis(120);
+
+    let mut uart = Uart::new(
+	peripherals.UART0,
+	esp_hal::uart::Config::default()
+	    .with_baudrate(10_400)
+	    .with_data_bits(DataBits::_8)
+    )
+	.expect("now I got a reason")
+	.with_rx(peripherals.GPIO20)
+	.with_tx(peripherals.GPIO21.reborrow());
+
+    uart.write(b"\xfe\x04\xff\xff").expect("write failed");
+    let _ = uart.flush();
+    delay.delay_millis(200);
+    uart.write(b"\x72\x05\x00\xF0\x99").expect("write 2 failed");
+    let _ = uart.flush();
+
     loop {
-        info!("Hello world!");
-	led.toggle();
-	delay.delay_millis(500);
+        info!("waiting");
+	let mut buf = [0u8; 80];
+	let bytes = uart.read(&mut buf[..]).expect("read failed");
+	if bytes>0 { led.toggle(); }
+
+	info!("got {bytes}");
+	delay.delay_millis(50);
     }
 
     // for inspiration have a look at the examples at https://github.com/esp-rs/esp-hal/tree/esp-hal-v1.0.0/examples/src/bin