From 38830d9fe4769878e18b69918a2dc217b29c5d53 Mon Sep 17 00:00:00 2001
From: Thomas Klaehn <thomas.klaehn@perinet.io>
Date: Fri, 14 Feb 2025 07:33:55 +0100
Subject: [PATCH] Add low power print to lp-core

Signed-off-by: Thomas Klaehn <thomas.klaehn@perinet.io>
---
 hp-core/src/main.rs | 18 ++++++++++++------
 lp-core/src/main.rs |  8 ++++++--
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/hp-core/src/main.rs b/hp-core/src/main.rs
index 5e9e92b..014170c 100644
--- a/hp-core/src/main.rs
+++ b/hp-core/src/main.rs
@@ -16,11 +16,12 @@
 
 use esp_backtrace as _;
 use esp_hal::{
-    gpio::lp_io::LowPowerOutput,
+    gpio::lp_io::{LowPowerInput, LowPowerOutput},
     load_lp_code,
     lp_core::{LpCore, LpCoreWakeupSource},
-    rtc_cntl::{Rtc, sleep::WakeFromLpCoreWakeupSource},
     main,
+    rtc_cntl::{sleep::WakeFromLpCoreWakeupSource, Rtc},
+    uart::{Config, lp_uart::LpUart}
 };
 use esp_println::{print, println};
 
@@ -28,9 +29,13 @@ use esp_println::{print, println};
 fn main() -> ! {
     let peripherals = esp_hal::init(esp_hal::Config::default());
 
-    // configure GPIO 1 as LP output pin
     let lp_pin = LowPowerOutput::new(peripherals.GPIO1);
 
+    let uart_cfg = Config::default();
+    let tx = LowPowerOutput::new(peripherals.GPIO5);
+    let rx = LowPowerInput::new(peripherals.GPIO4);
+    let lp_uart = LpUart::new(peripherals.LP_UART, uart_cfg, tx, rx);
+
     let mut rtc = Rtc::new(peripherals.LPWR);
     let reason = WakeFromLpCoreWakeupSource::default();
 
@@ -43,7 +48,7 @@ fn main() -> ! {
         load_lp_code!("./target/riscv32imac-unknown-none-elf/release/lp-core");
 
     // start LP core
-    lp_core_code.run(&mut lp_core, LpCoreWakeupSource::HpCpu, lp_pin);
+    lp_core_code.run(&mut lp_core, LpCoreWakeupSource::HpCpu, lp_uart, lp_pin);
     println!("lpcore -> run");
 
     let mut last: u32 = 0;
@@ -56,7 +61,8 @@ fn main() -> ! {
             print!("Current {:x}           \u{000d}", read);
             last = read;
         }
-        println!("hp-core -> deep sleep");
-        rtc.sleep_light(&[&reason]);
+        // FIXME...
+        // println!("hp-core -> deep sleep");
+        // rtc.sleep_light(&[&reason]);
     }
 }
diff --git a/lp-core/src/main.rs b/lp-core/src/main.rs
index 4947597..4b61a98 100644
--- a/lp-core/src/main.rs
+++ b/lp-core/src/main.rs
@@ -7,15 +7,17 @@
 #![no_std]
 #![no_main]
 
+use core::fmt::Write;
+
 use embedded_hal::{delay::DelayNs, digital::OutputPin};
-use esp_lp_hal::{delay::Delay, gpio::Output, prelude::*, wake_hp_core};
+use esp_lp_hal::{delay::Delay, uart::LpUart, gpio::Output, prelude::*, wake_hp_core};
 use panic_halt as _;
 
 const ADDRESS: u32 = 0x5000_2000;
 
 
 #[entry]
-fn main(mut gpio1: Output<1>) -> ! {
+fn main(mut lp_uart :LpUart, mut gpio1: Output<1>) -> ! {
     let mut i: u32 = 0;
 
     let ptr = ADDRESS as *mut u32;
@@ -26,10 +28,12 @@ fn main(mut gpio1: Output<1>) -> ! {
             ptr.write_volatile(i);
         }
 
+        writeln!(lp_uart, "high\n").unwrap();
         gpio1.set_high().unwrap();
         wake_hp_core();
         Delay.delay_ms(500);
 
+        writeln!(lp_uart, "low\n").unwrap();
         gpio1.set_low().unwrap();
         Delay.delay_ms(500);
     }