BatteryRam replacement in 4.3

NETMF & Gadgeteer
1

I am porting my code to 4.3. I cannot figure out how to serialize and desalinize my variables to the Ram of the EMX. Is the register class the only option?

2

Yes. It is a straight read and write, nothing special.

3

I thought It was straight forward, but things aren’t working out, I wrote the code as follows:
GHI.Processor.Register regReader = new GHI.Processor.Register(AddressStart);
for (int i = 0, j = 0; i < length; i++, j += 4)
{
regReader.Address = (uint)(AddressStart + j * 8);
baData[i] = (byte)regReader.Value;
}
But I think the regReader.Value may be 4 bytes, but I only need 1. Right?
So how do I only grab 1 byte of data for baData from regReader.Value, i can’t figure out the syntax.
Also do I have to have a battery connected to the fez spider for the Ram to work properly?

4

Please clarify. I thought you are porting a working code. Did your code work on the spider before? no it does not have a battery.

5

The code works on and EMX in a custom box from DMC chicago. I have purchased a fex spider in the hopes to update the code base to 4.3.

The original code used BatteryRAM
BatteryRAM.Read((uint)(m_AddressStart), baData, 0, iLength);
but BatteryRam is not in 4.3, so I am trying to use GHI.Processor.Register to replace the BatteryRAM.Read\Write code

6

You need to get the address from the lpc2478 user manual, the battery ram address that is.

Once you have that, your code should work.

7

I got it its 0xE400…

8

Thanks for taking a look. I’ll give it another try with a single address reading 4 bytes and see if I can store and retrieve an integer to and from the RAM.

9

BatteryRAM Write replacement:


        private static void BatteryRamWrite(uint address, ref byte[] buffer, int offset, int count)
        {
            int reps = 0;
            for (int i = 0; i < count / 4; i++)
            {
                GHI.Processor.Register writer = new GHI.Processor.Register((uint)(address + offset + i*4), BitConverter.ToUInt32(buffer, i * 4));
                reps++;
            }
        }

BatteryRAM Read replacement:


        private static void BatteryRamRead(uint address, ref byte[] buffer, int offset, int count)
        {
            int reps = 0;
            for (int i = 0; i < count / 4; i++)
            {
                GHI.Processor.Register reader = new GHI.Processor.Register((uint)(address + offset + i*4));
                byte[] bytes = BitConverter.GetBytes(reader.Value);
                buffer[4 * i] = bytes[0];
                buffer[4 * i + 1] = bytes[1];
                buffer[4 * i + 2] = bytes[2];
                buffer[4 * i + 3] = bytes[3];
                reps++;
            }
        }
10

Great. Would you please use code tags to make your code more readable?

11

I am not sure what you mean by code tags. Should I add comments to the code block?

12

Click on the button </> when you click edit please.