GPIO Input Interrupt

Table of Contents

• Introduction
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

This example configures a GPIO pin in input mode and configures it to generate interrupt on rising edge. The application waits for 5 key presses, prints the number of times the keys are pressed and exits.

Attention

A GPIO bank interrupt can be routed to only one core at a time. For example if a gpio interrupt is routed to Linux A53 core, the same cannot be routed to other cores (M4/R5).

Before running the GPIO Input interrupt example on a processor with Linux cores, disable any overlapping entries in the Linux devicetree board file. The GPIO can be excluded from the linux device tree by modifying the device tree board file (arch/arm64/boot/dts/ti/k3-am642-evm.dts)

&mcu_gpio0 {
        status = "reserved";
};
&mcu_gpio_intr {
        status = "reserved";
};

A new linux devicetree blob (dtb) should be generated with this change and placed in the Linux filesystem in the boot folder. For more information, reference the AM64x Linux SDK docs, section Foundational Components > Kernel > Users Guide. The kernel and kernel modules do not need to be rebuilt and reinstalled.

Note

The RM board config need to have an entry for the interrupt router for the core if the gpio interrupt is routed to the core through the interrupt router.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Board	am64x-evm
Example folder	examples/drivers/gpio/gpio_input_interrupt/

Steps to Run the Example

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run
• Press and release SW5 button on the EVM to generate the trigger GPIO interrupt. This button is connected to GPIO1_43.

See Also

GPIO

Sample Output

Shown below is a sample output when the application is run,

GPIO Input Interrupt Test Started ...
GPIO Interrupt Configured for Rising Edge (Button release will trigger interrupt) ...
Press and release SW5 button on EVM to trigger GPIO interrupt ...
Key is pressed 0 times
Key is pressed 0 times
Key is pressed 0 times
Key is pressed 0 times
Key is pressed 0 times
Key is pressed 0 times
Key is pressed 0 times
Key is pressed 0 times
Key is pressed 0 times
Key is pressed 0 times
Key is pressed 1 times
Key is pressed 2 times
Key is pressed 5 times
GPIO Input Interrupt Test Passed!!
All tests have passed!!