Add low power print to lp-core

Signed-off-by: Thomas Klaehn <thomas.klaehn@perinet.io>

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]);
     }
 }