7-Segment Display¶

BROADCOM HDSP-A103 common cathode 7-Segment digit

Datasheets

HDSP-A103 Datasheet

Indices¶

When interacting with individual 7-Segments, the following indexing is used.

If instead individual segments should get addressed, the typical naming convention is used.

Description¶

The four 7-segment displays can be used in four different modes;

Display a unsigned integer from 0 to 9999
Display a signed integer from -999 to 999
Display an unsigned integer in hexadecimal
Display a floating point value from -99.9 to 99.9

The floating point representation changed the decimal point according to the value. If the value is in the rang ]-10 to 10[ there will be two decimal points.

Note

When using a function to display a value, the function must be called frequently (>200Hz), since the function takes care of the multiplexing.

Usage¶

Note

When the function is called in a while loop with no delay, the multiplexing will have some errors due to switching delays.

To shut down, the disable function can be used. This function will disable all segments and digits.

Example to display an unsigned integer

while(1) {

    // Set the value
    yggdrasil_SevenSegment_SetUnsigned(1234);

    // Add a delay
    core_Delay(1);

}

while(true) {

    // Set the value
    bsp::ygg::prph::SevenSegment::setUnsigned(1234);

    // Add a delay
    bsp::core::delay(1);

}

Example to display an unsigned integer in hexadecimal

while(1) {

    // Set the value
    yggdrasil_SevenSegment_SetHexadecimal(0xACDC);

    // Add a delay
    core_Delay(1);

}

while(true) {

    // Set the value
    bsp::ygg::prph::SevenSegment::setHexadecimal(0xACDC);

    // Add a delay
    bsp::core::delay(1);

}

Example to display an signed integer

while(1) {

    // Set the value
    yggdrasil_SevenSegment_SetSigned(-123);

    // Add a delay
    core_Delay(1);

}

while(true) {

    // Set the value
    bsp::ygg::prph::SevenSegment::setSigned(-123);

    // Add a delay
    bsp::core::delay(1);

}

Example to display an floating point value

while(1) {

    // Set the value
    yggdrasil_SevenSegment_SetFloatingPoint(-3.14);

    // Add a delay
    core_Delay(1);

}

while(true) {

    // Set the value
    bsp::ygg::prph::SevenSegment::setFloatingPoint(-3.14);

    // Add a delay
    bsp::core::delay(1);

}

It is also possible to access the every digit on it own. The example below will print 6 to the second digit from the left.

while(1) {

    // The value to display (accepts also hexadecimal)
    yggdrasil_SevenSegment_SetDigit(6);

    // Enable the digit. in this case the second from the left
    yggdrasil_SevenSegment_EnableDigit(1);

    // The delay is optional, since no multiplexing is done
    core_Delay(1);

}

while(true) {

    // The value to display (accepts also hexadecimal)
    bsp::ygg::prph::SevenSegment::setDigit(6);

    // Enable the digit. in this case the second from the left
    bsp::ygg::prph::SevenSegment::enableDigit(1);

    // The delay is optional, since no multiplexing is done
    bsp::core::delay(1);

}