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If you're using SigmaStudio graphical development tools in your design, you might be facing a challenging issue: how to integrate SigmaStudio's engineering code into an MCU or how to build a simple audio project based on a development board. If you have any questions related to SigmaStudio or SigmaDSP, make an appointment with an ADI expert who can help you solve the problem! PS: The engineers involved are "hand-picked," and there's even a chance to receive a gift. For more details about the event, click "Read the original" to learn more ↓↓↓
SigmaDSP® series devices come equipped with various general-purpose input/output (GPIO) pins that can be connected to external hardware components such as LEDs, buttons, or rotary encoders. Some of these pins can also be multiplexed to the auxiliary ADC, allowing for direct connection of a potentiometer or analog control voltage to the IC. This article briefly explains how to use GPIO in SigmaStudio, a graphics-based development tool used for programming, developing, and tuning software for SigmaDSP audio processors.
The first step is understanding how to access the GPIO pins. In SigmaStudio, you can find the general-purpose input and output units in the IO section of the Toolbox. These units can be accessed via a drop-down menu, just like other units in SigmaStudio. The control signal input and output display in red. Similarly, the auxiliary ADC input unit works in a similar fashion.
Next, you need to configure the GPIO pin using the register control window in SigmaStudio. Examples of GPIO register controls are shown in figures 4 through 6. Depending on the interface circuit, you can set the GPIO pin to different modes, including “Input GPIO Debounce,†“Input GPIO No Debounce,†“Output GPIO,†“Output GPIO Open Collector,†or “ADC.†Some devices allow these pins to be used for digital audio data or clock inputs. On certain devices, the GPIO pins may be labeled as MP (Multipurpose), but they function in the same way.
One common issue when connecting switches or buttons to a GPIO pin is contact jitter, which occurs due to mechanical and electrical factors during the switching process. To minimize this, a debounce circuit should be integrated into the GPIO circuit of the SigmaDSP. Typically, the debounce time can be set in the GPIO section of the register control window. The kernel reads the input values from the associated registers for each audio frame.
For inputs not affected by jitter, such as outputs from an external logic IC, the debounce circuit can be bypassed. In this case, the kernel still reads the input values from the associated registers.
When setting a pin as an Output GPIO, it allows for digital output. However, the maximum current per pin is usually only a few milliamps, so refer to the relevant SigmaDSP datasheet for more information. The GPIO pin reads the input value from the associated register for each audio frame.
In open-collector mode, the pin requires an external pull-up resistor. This mode is useful when connecting ICs at different logic levels. The GPIO pin again reads the input value from the associated register for each audio frame.
Another mode allows the GPIO pin to be controlled via the control port. In this mode, the core reads the corresponding value from the register, which can be read or written via the control port. This is ideal when using an external host controller to manage signal flow elements.
Similarly, in drive output mode, the GPIO pin's output is controlled directly via the control port, making it useful for controlling external components like LEDs.
When a pin is set to ADC mode, it acts as a multiplexed input for the auxiliary ADC. On the ADAU170x, the reverse phase must be activated for proper ADC operation. Although the ADC sampling rate depends on the specific SigmaDSP, the core will still read the input value from the ADC for each audio frame.
Within SigmaStudio, GPIO pins can be assigned to control or be controlled by the audio signal handler. Their function can be changed while the device is running. If your user interface uses GPIO pins, it can significantly reduce the need for a microcontroller, lowering the cost of a simple audio system.