Specialized

Docs under migration

These docs are under active migration and updates. The original docs will remain available at docs.ghielectronics.com for future reference.

Some of the specialized low-level features in this section are used to directly access hardware control or change the normal behavior of the SITCore processor.

warning

This section is for ADVANCED users. An understanding of how processors & registers work is recommended.

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Register Access

The Marshal class allows us to directly access and modify some of the internal processor's registers. More on this can be found in the Marshal class section.

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SD Card Control

A user may find it necessary to change the clock speed of the SD card. Using the Marshal class, we can directly access the processor and slow down the clock speed of the SD peripheral.

note

This may be necessary depending on the design of the final product, or the use of low-cost SD cards.

const int SD_CLOCK_ADDRESS_REG = 0x00000004;

var clock_divider = 4; // 0,1,2,3 are 25MHz, 4: 12MHz, 5: 10MHz, 6: 8MHz...
            
Marshal.WriteInt32((IntPtr)SD_CLOCK_ADDRESS_REG, clock_divider);

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Disable Interrupts

Interrupts can be disabled and enabled. This is useful in timing critical tasks however interrupts shold only be disabled for a very short time.

var isDisabled = Interrupt.IsDisabled();

if (isDisabled == false){
    Interrupt.Disable();
}

// code....

if (isDisabled == false){
    Interrupt.Enable();
}

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Alternate Functions

Some pins on a SITCore processor may offer alternate functions. There is an example in the GPIO section on moving a feature from one pin to another.

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Temperature

The processor's internal temperature can be read as shown in the the Analog In tutorial.

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