store backup now in binary, and let backend serialize/deserialize

Software/MainBoard/rust/src/hal/v4_hal.rs

@@ -3,7 +3,7 @@ use crate::config::PlantControllerConfig;
 use crate::fat_error::{ContextExt, FatError, FatResult};
 use crate::hal::battery::BatteryInteraction;
 use crate::hal::esp::{hold_disable, hold_enable, Esp};
-use crate::hal::rtc::RTCModuleInteraction;
+use crate::hal::rtc::{BackupHeader, RTCModuleInteraction, EEPROM_PAGE, X25};
 use crate::hal::water::TankSensor;
 use crate::hal::{
     BoardInteraction, Detection, FreePeripherals, Moistures, Sensor, I2C_DRIVER, PLANT_COUNT,
@@ -13,6 +13,7 @@ use crate::log::{LogMessage, LOG_ACCESS};
 use alloc::boxed::Box;
 use alloc::string::ToString;
 use async_trait::async_trait;
+use bincode::config;
 use canapi::id::{classify, plant_id, MessageKind, IDENTIFY_CMD_OFFSET};
 use canapi::SensorSlot;
 use embassy_embedded_hal::shared_bus::blocking::i2c::I2cDevice;
@@ -32,6 +33,9 @@ use measurements::Resistance;
 use measurements::{Current, Voltage};
 use pca9535::{GPIOBank, Pca9535Immediate, StandardExpanderInterface};
 
+pub const BACKUP_HEADER_MAX_SIZE: usize = 64;
+const CONFIG: config::Configuration = config::standard();
+
 const MPPT_CURRENT_SHUNT_OHMS: f64 = 0.05_f64;
 const TWAI_BAUDRATE: twai::BaudRate = twai::BaudRate::Custom(twai::TimingConfig {
     baud_rate_prescaler: 200, // 40MHz / 200 * 2 = 100 on C6, 100 * 20 = 2000 divisor, 40MHz / 2000 = 20kHz
@@ -538,6 +542,59 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
         }
         Ok(())
     }
+    async fn backup_config(&mut self, controller_config: &PlantControllerConfig) -> FatResult<()>{
+        let mut buffer: [u8; 4096-BACKUP_HEADER_MAX_SIZE] = [0; 4096-BACKUP_HEADER_MAX_SIZE];
+        let length = bincode::encode_into_slice(controller_config, &mut buffer, CONFIG)?;
+        let mut checksum = X25.digest();
+        checksum.update(&buffer[..length]);
+        let mut header_page_buffer = [0_u8; BACKUP_HEADER_MAX_SIZE];
+
+        let time = self.rtc_module.get_rtc_time().await?.timestamp_millis();
+        let header = BackupHeader {
+            crc16: checksum.finalize(),
+            timestamp: time,
+            size: length as u16,
+        };
+        bincode::encode_into_slice(&header, &mut header_page_buffer, CONFIG)?;
+        self.get_rtc_module().write(0, &header_page_buffer)?;
+        let mut to_write = length;
+        let mut chunk: usize = 0;
+
+        while to_write > 0 {
+            self.progress(chunk as u32).await;
+            let start = BACKUP_HEADER_MAX_SIZE + chunk* EEPROM_PAGE;
+            let end = start + crate::hal::rtc::EEPROM_PAGE;
+            let part = &buffer[start..end];
+            to_write -= part.len();
+            chunk += 1;
+            self.get_rtc_module().write((1 + chunk) as u32, part)?;
+        }
+        self.clear_progress().await;
+        Ok(())
+    }
+
+    async fn read_backup(&mut self) -> FatResult<PlantControllerConfig> {
+        let info = self.backup_info().await?;
+        let mut store = alloc::vec![0_u8; info.size as usize];
+        self.rtc_module.read(BACKUP_HEADER_MAX_SIZE as u32, store.as_mut_slice())?;
+        let mut checksum = X25.digest();
+        checksum.update(&store[..]);
+        let crc = checksum.finalize();
+        if crc != info.crc16 {
+            bail!("CRC mismatch in backup data")
+        }
+        let (decoded, _) = bincode::decode_from_slice(&store[..], CONFIG)?;
+        Ok(decoded)
+    }
+
+    async fn backup_info(&mut self) -> FatResult<BackupHeader> {
+        let mut header_page_buffer = [0_u8; BACKUP_HEADER_MAX_SIZE];
+        self.get_rtc_module().read(0, &mut header_page_buffer)?;
+
+        let info: Result<(BackupHeader, usize), bincode::error::DecodeError> =
+            bincode::decode_from_slice(&header_page_buffer[..], CONFIG);
+        info.map(|(header, _)| header).map_err(|e| FatError::String {error:"Could not read backup header: ".to_string() + &e.to_string()})
+    }
 }
 
 async fn wait_for_can_measurements(
@@ -597,6 +654,8 @@ async fn wait_for_can_measurements(
             }
         }
     }
+
+
 }
 
 impl From<Moistures> for Detection {