Use root partition for Disk Usage calculation

README.md

@@ -19,23 +19,58 @@ sudo reboot
 ```
 **Wait for the system to restart**
 
-##  Clone SKU_RM0004 library 
+<br>
+
+##  Pre-Requisites
+### Ubuntu
+Install necessary dependencies to compile the project:
+```bash
+sudo apt install make gcc
+```
+### Home Assistant
+```bash
+$ apk add make gcc musl-dev i2c-tools i2c-tools-dev linux-headers
+```
+
+##  Building
+###  Clone SKU_RM0004 library
 ```bash
 git clone https://github.com/UCTRONICS/SKU_RM0004.git
 ```
-## Compile 
+### Compile 
 ```bash
 cd SKU_RM0004
 make
 ```
-## Run 
+### Run 
 ```
 ./display
 ```
 
+## Installing
+
+### Ubuntu
+1. Create file `/etc/systemd/system/rpi-display.service`
+    ```
+    [Unit]
+    After=network.target
 
+    [Service]
+    ExecStart=/home/user/git/SKU_RM0004/display
 
+    [Install]
+    WantedBy=default.target
+    ```
+1. Create folder (if it doesn't exist):
+    ```
+    $ mkdir /etc/systemd/system/default.target.wants
+    ```
+1. Create soft link to service file:
+    ```
+    $ ln -s /etc/systemd/system/rpi-display.service /etc/systemd/system/default.target.wants/default.target.wants
+    ```
 
+### Others
 ## Add automatic start script
 **Open the rc.local file**
 ```bash

hardware/rpiInfo/rpiInfo.c

@@ -98,7 +98,7 @@ void get_cpu_memory(float *Totalram,float *freeram)
             {
              *Totalram=value/1000.0/1000.0;
             }
-            else if(strcmp(famer,"MemFree:")==0)
+            else if(strcmp(famer,"MemAvailable:")==0)
             {
               *freeram=value/1000.0/1000.0;
             }
@@ -135,11 +135,11 @@ uint8_t get_hard_disk_memory(uint16_t *diskMemSize, uint16_t *useMemSize)
   uint8_t diskMembuff[10] = {0};
   uint8_t useMembuff[10] = {0};
   FILE *fd = NULL;
-  fd=popen("df -l | grep /dev/sda | awk '{printf \"%s\", $(2)}'","r"); 
+  fd=popen("df -l / | grep /dev/sda | awk '{printf \"%s\", $(2)}'","r"); 
   fgets(diskMembuff,sizeof(diskMembuff),fd);
   fclose(fd);
 
-  fd=popen("df -l | grep /dev/sda | awk '{printf \"%s\", $(3)}'","r"); 
+  fd=popen("df -l / | grep /dev/sda | awk '{printf \"%s\", $(3)}'","r"); 
   fgets(useMembuff,sizeof(useMembuff),fd);
   fclose(fd);
 
@@ -185,4 +185,4 @@ uint8_t get_cpu_message(void)
     syCpu = atoi(syCpubuff);
     return usCpu+syCpu;
 
-}
+}