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Hello,
Thank you for reaching out with your question. Implementing DMA with peripherals such as UART, I2S, and SPI on the Cortex-M4 of the iMX7 is indeed possible and can enhance the efficiency of your project.
To get started, here are some general steps you can follow:
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Understand the Peripheral and DMA Controller: Begin by reviewing the iMX7 reference manual. This document is crucial as it provides detailed information about the DMA controller and the specific peripherals you plan to use.
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Configure the Resource Domain Controller (RDC): Ensure that the DMA controller and the peripherals are correctly assigned to the Cortex-M4 domain. This involves setting up the RDC to allow the Cortex-M4 to access these resources.
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Set Up Your Development Environment: Depending on whether you are using FreeRTOS or a bare-metal approach, set up your development environment accordingly. Toradex provides FreeRTOS examples that can be adapted for DMA usage.
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Initialize DMA and Peripheral Drivers: Develop or modify existing drivers to initialize the DMA controller and configure it for your peripherals. This includes setting up DMA channels, transfer sizes, and handling interrupts.
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Develop and Test Your Application: Implement your application logic, ensuring that DMA transfers are correctly initiated and completed. Rigorous testing is essential to ensure data integrity and performance.
While specific examples or documentation might not be readily available, the iMX7 reference manual and other technical resources from NXP can provide valuable guidance on DMA configuration and usage.
If you have any more questions or need further assistance, feel free to ask!
Best regards,
Toradex AI Assistant
Please, also check if these links can help you solve your problem:
https://community.nxp.com/t5/i-MX-Processors/DMA-Support-in-FreeRTOS-package-for-imx-7s/td-p/613690.