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Orange Pi Bare Metal

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Published in 2016-8-26 16:56:01 | Show all floors |Read mode
Hi,

Any Orange Pi Bare metal code is  available ?, minimum just to blink LED's or UART communication..
How the boot sequence works?

Regards,
Varghese ..

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 Author| Published in 2016-8-29 04:41:15 | Show all floors
Update :

guys,

I did some work on this .. Now the Orange Pi bare metal code is ready ..

This is tested for Orange Pi Pc , Other boards should also work  ..

// Procedure
1. write any orange pi Linux OS to the SD Card , I have used Lubuntu_1404_For_OrangePiPC_v0_8_0_.img...  This will write the bootloader in proper place .
   ( this method is pretty simple , otherwise you have to use linux & write the bootloader in the particular partition)
2. Copy the "blink.bin" in the fat partition, same folder where  "script.bin" & "uimage" is present  (you can use any windows/linux OS )  
3. Connect USB-UART to the orange Pi , open serial putty  (use  http://www.putty.org/ or any serial application )
4. Power ON ,  now you can see boot messages in the putty screen , press any key immediately,   this will stop the control goes to linux ..
5. Now you can see "sunxi#" prompt  , enter the below command  
     fatload mmc 0 0x41000000 blink.bin; go 0x41000000
6. Now ""hello world " message appears ..

compiling  , I use gcc-arm-none-eabi-4_7-2013q3-20130916-win32.exe , on windows
just "make"

code , refer the attachment

unsigned int count=0;
int notmain ( void )
{
   
        uart_print("Hello world \n");
        while(1)
        {
                if(count)
                {
              PUT32(PIO_BASE+PA_DATA_REG, 1<<15); //pa15 red led refer schematics
                  count=0;
                }
                else
                {
                  PUT32(PIO_BASE+PA_DATA_REG, 0);
                  count=1;
                }
            uart_send(uart_recv());  // wait till it gets new char  -  echo
        }
    return(0);
}

many thanks to David Welch ,  this code is based on his bare metal code ..

I would love to add additional functionalities like , GPIO , SPI ,I2C ,Timer ,PWM , Interrupts ,Display ..

Once its added we can easily port to other Embedded OS ,  like , FreeRTOS  , Windows CE & QNX

One major good thing with this Allwinner H3 board is , it has "ehci" "ohci" USB stack , which is very easy to port  .. thats where raspberry pi fuckked up , designware OTG(raspberry uses)  has no documentation & hard to implement ..

Varghese

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Published in 2016-9-3 16:48:08 | Show all floors

Hi friend, thanks for your share!

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 Author| Published in 2016-9-15 19:14:17 | Show all floors
Hi Guys ,

another one awesome project , can try in the weekend

"OrangePi Ethernet Bare metal "

Resources  available
1.http://linux-sunxi.org/File:Allwinner_H3_Datasheet_V1.2.pdf      
emac registers  -page 570  , in addition we can use Linux kernel source code  " sunxi_geth.c"
2.Ethernet arduino stack example for ENC28J60  ( we need to replace 3 functions 1.Init  2.Transmit packet 3.Receive packet
3.Testing , we can use "wireshark" software
4. Base code , we can use my previous example code , that can access H3 processor registers using GET32() , PUT32() functions

After this

"Baremetal HDMI video " project  , details can be found in H3 datasheet page no 425. , yes we can use Linux Source also
Just need to access the framebuffer & draw a line ..

Varghese
rpidmx512 The user has been deleted
Published in 2018-5-16 00:47:46 | Show all floors
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Published in 2021-2-5 04:58:31 | Show all floors
Hello!  It's great when there are forums where they can share important information.
Thank you!
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Published in 2021-5-10 21:42:15 | Show all floors


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