[FAQ] FAQs of FAQs GPIOs

Getting Started Guides

These FAQs will help someone get the fundamentals down for working with GPIOs. They cover practical use cases, configuration methods for toggling GPIOs, and managing GPIOs in different software environments and boot stages.

1. How to Toggle GPIO from R5 SPL: [FAQ] PROCESSOR-SDK-AM62X: How to Toggle a GPIO from R5 SPL - Processors forum - Processors - TI E2E support forums
   1. Part #: AM62X
2. Getting Started with GPIOs in Linux: [FAQ] PROCESSOR-SDK: Getting Started with GPIOs in Linux using the AM62 and AM64 Family Processors - Processors forum - Processors - TI E2E support forums
   1. Part #: AM64x, AM62A, AM62P, AM62L
3. How to Toggle LED from U-Boot: [FAQ] PROCESSOR-SDK-AM62X: How to Toggle GPIOs and LEDs from U-Boot Command Prompt - Processors forum - Processors - TI E2E support forums
   1. Part #: AM62X
4. How to Allocate and Use GPIOs form Different Device Domains: [FAQ] AM62X: How to Allocate & Use GPIOs from Different Device Domains - Processors forum - Processors - TI E2E support forums
   1. Part #: AM62X
5. Transitioning the GPIO userspace interface from SYSFS to Chardev: [FAQ]: Transitioning the GPIO userspace interface from SYSFS to Chardev - Processors forum - Processors - TI E2E support forums
   1. Part #: AM62x, AM64x
6. How to Toggle GPIO Pin on PRU: [FAQ] AM6442( AM64X) : How to Toggle GPIO Pin on PRU? - Processors forum - Processors - TI E2E support forums
   1. Part #:  AM64X

Interrupts

These FAQs cover configuring and troubleshooting GPIO interrupts. Topics include interrupt routing, handling edge triggers, and resolving common SDK configuration issues to ensure reliable interrupt operation across different cores and software environments.

1. Undeclared Identifier for MCU and GPIO Interrupt Routers: [FAQ] PROCESSOR-SDK-AM64X: Undeclared Identifier for MCU GPIO Interrupt Routers - Processors forum - Processors - TI E2E support forums
   1. Part #: AM64X
2. How to Generate GPIO interrupt on both falling and rising edge: [FAQ] PROCESSOR-SDK-AM64X: How to generate GPIO interrupt on both falling and rising edge? - Processors forum - Processors - TI E2E support forums
   1. Part #: AM64X
3. How to route the same GPIO bank interrupt to different destination cores: [FAQ] AM64X/AM62X: How do I route the same GPIO bank interrupts to different destination cores? - Processors forum - Processors - TI E2E support forums
   1. Part #: AM64X, AM62X
4. How to configure a GPIO interrupt: [FAQ] AM6442: How to configure the GPIO interrupt - Processors forum - Processors - TI E2E support forums
   1. Part # AM64X
5. GPIO Input Interrupt Sciclient config failed in MCU PLUS SDK Version 6.0 & above: [FAQ] AM6442: GPIO Input Interrupt Sciclient config failed in MCU PLUS SDK Version 6.0 & above - Processors forum - Processors - TI E2E support forums
   1. Part #: AM64X
6. How to configure the GPIO interrupt on AM62X in MCU+SDK: [FAQ] SK-AM62 : How to configure the GPIO interrupt on AM62X in MCU+SDK. - Processors forum - Processors - TI E2E support forums
   1. Part #: AM62X

 Custom Software/Hardware

These FAQs cover recommendations on using the GPIOs for custom hardware as well as additional resources per specific Sitara devices.

1. Custom board hardware design: [FAQ] AM625 / AM623 / AM620-Q1 / AM62Ax / AM62Px / AM62D-Q1 / AM62L / AM64x / AM243x Design Recommendations / Custom board hardware design - Queries related to GPIO - Processors forum - Processors - TI E2E support forums
   1. Part #: AM625, AM623, AM620-Q1, AM62Ax, AM62Px, AM62D-Q1, AM62L, AM64x, AM243x
2. Custom board hardware design: [FAQ] AM625 / AM623 / AM620-Q1 / AM62Ax / AM62Px / AM62D-Q1 / AM62L / AM64x / AM243x (ALV) / AM335x Design Recommendations / Custom board hardware design - Schematics review checklists - Processors forum - Processors - TI E2E support forums
   1. Part #: AM625, AM623, AM620-Q1, AM62Ax, AM62Px, AM62D-Q1, AM62L, AM64x, AM243x

PRU

These FAQs explain how to use and configure GPIOs with the Programmable Real-Time Unit (PRU) on TI processors. Together, the resources can provide a foundation for understanding and utilizing PRU-based GPIO control in real time applications.

1. How to Toggle GPIO Pin on PRU: [FAQ] AM6442( AM64X) : How to Toggle GPIO Pin on PRU? - Processors forum - Processors - TI E2E support forums
   1. Part #: AM64X
2. How to enable switching capability between GPO and GPI operation for PRU GPIO: [FAQ] How to enable switching capability between GPO and GPI operation for PRU GPIO? - Processors forum - Processors - TI E2E support forums
   1. Part #: AM64X
3. What is a PRU Core? Why are PRU GPIO signals different from regular GPIOs: [FAQ] What is a PRU core? Why are PRU GPIO signals different from regular GPIOs? - Processors forum - Processors - TI E2E support forums
   1. Part #: General

DMA

The following FAQ covers direct memory access in relation to GPIOs for specific Sitara devices.

1. How to Trigger DMA with help of GPIO on AM64X: [FAQ] : How to trigger DMA with the help of GPIO on AM64X/AM243 and AM62X devices ? - Processors forum - Processors - TI E2E support forums
   1. Part #: AM64X, AM243, AM62X

Additional Resources Outside Sitara

1. How to identify a GPIO and toggle the same: [FAQ] TDA4VM: How to identify a GPIO and toggle the same - Processors forum - Processors - TI E2E support forums
2. How to determine the GPIO number within Linux for pin within the schematic: [FAQ] CCS/TDA4VM: TDA4: How do I determine the GPIO number within linux for a pin within the schematic? - Processors forum - Processors - TI E2E support forums
3. Using PDK GPIO Driver: [FAQ] TDA4VM: Using PDK GPIO driver - Processors forum - Processors - TI E2E support forums
4. How to Profile GPIO Toggle: [FAQ] TDA4VL: How to profile a GPIO toggled ISR , any example? - Processors forum - Processors - TI E2E support forums
5. How to configure GPIO interrupt and test on Keystone 1 Devices: [FAQ] TMS320C6678: How to configure GPIO interrupt and test on Keystone I devices - C6678 ? - Processors forum - Processors - TI E2E support forums
6. How do I use GPIO interrupts in PDK and how are they routed: [FAQ] TDA4VM: How do I use GPIO interrupts in PDK and how are they routed? - Processors forum - Processors - TI E2E support forums
7. GPIO Interrupts are not functional: [FAQ] J784S4XEVM: 8.6 SDK - GPIO Interrupts are not functional - Processors forum - Processors - TI E2E support forums
8. How to test GPIO interrupts: [FAQ] TDA4VM: How to test GPIO interrupts - Processors forum - Processors - TI E2E support forums
9. GPIO+DMA Trigger and test in SDK7.1: [FAQ] TDA4VM: GPIO+DMA Trigger in TDA4 and test in SDK7.1 - Processors forum - Processors - TI E2E support forums
10. GPIO interrupt use DMA [FAQ] TDA4VM: GPIO interrupt use DMA - Processors forum - Processors - TI E2E support forums
11. Using PDK GPIO Driver: [FAQ] TDA4VM: Using PDK GPIO driver - Processors forum - Processors - TI E2E support forums
12. How to run GPIO example for DSP core on K2G EVM: [FAQ] EVMK2G: How to run GPIO Examples for DSP core on K2G EVM - Processors forum - Processors - TI E2E support forums