93 lines
4.1 KiB
ReStructuredText
93 lines
4.1 KiB
ReStructuredText
.. _mimxrt_general:
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General information about the MIMXRT port
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=========================================
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The i.MXRT MCU family is a high performance family of devices made by NXP.
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Based on an ARM7 core, they provide many on-chip I/O units for building
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small to medium sized devices.
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Multitude of boards
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-------------------
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There is a multitude of modules and boards from different sources which carry
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an i.MXRT chip. MicroPython aims to provide a generic port which runs on
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as many boards/modules as possible, but there may be limitations. The
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NXP IMXRT1020-EVK and the Teensy 4.0 and Teensy 4.1 development boards are taken
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as reference for the port (for example, testing is performed on them).
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For any board you are using please make sure you have a data sheet, schematics
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and other reference materials so you can look up any board-specific functions.
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The following boards are supported by the port:
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- MIMXRT1010-EVK
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- MIMXRT1020-EVK
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- MIMXRT1050-EVK
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- MIMXRT1060-EVK
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- MIMXRT1064-EVK
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- Teensy 4.0
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- Teensy 4.1
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Supported MCUs
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--------------
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+-------------+--------------------+-------------------------+
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| Product | CPU | Memory |
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+=============+====================+=========================+
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| i.MX RT1064 | Cortex-M7 @600 MHz | 1 MB SRAM, 4 MB Flash |
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+-------------+--------------------+-------------------------+
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| i.MX RT1061 | Cortex-M7 @600 MHz | 1 MB SRAM |
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+-------------+--------------------+-------------------------+
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| i.MX RT1062 | Cortex-M7 @600 MHz | 1 MB SRAM |
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+-------------+--------------------+-------------------------+
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| i.MX RT1050 | Cortex-M7 @600 MHz | 512 kB SRAM |
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+-------------+--------------------+-------------------------+
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| i.MX RT1020 | Cortex-M7 @500 MHz | 256 kB SRAM |
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+-------------+--------------------+-------------------------+
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| i.MX RT1010 | Cortex-M7 @500 MHz | 128 kB SRAM |
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+-------------+--------------------+-------------------------+
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Note: Most of the controllers do not have internal flash memory. Therefore
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their flash capacity is dependent on an external flash chip.
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To make a generic MIMXRT port and support as many boards as possible the
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following design and implementation decision were made:
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* GPIO pin numbering is based on the board numbering as well as on the
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MCU numbering. Please have the manual/pin diagram of your board at hand
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to find correspondence between your board pins and actual i.MXRT pins.
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* All MCU pins are supported by MicroPython but not all are usable on any given board.
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Technical specifications and SoC datasheets
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-------------------------------------------
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The data sheets and other reference material for i.MXRT chip are available
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from the vendor site: https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/i-mx-rt-crossover-mcus:IMX-RT-SERIES .
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They are the primary reference for the chip technical specifications, capabilities,
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operating modes, internal functioning, etc.
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For your convenience, a few technical specifications are provided below:
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* Architecture: ARM Cortex M7
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* CPU frequency: up to 600MHz
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* Total RAM available: up to 1 MByte (see table)
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* BootROM: 96KB
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* External FlashROM: code and data, via SPI Flash; usual size 2 - 8 MB
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Some boards provide additional external RAM and SPI flash.
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* GPIO: up to 124 (GPIOs are multiplexed with other functions, including
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external FlashROM, UART, etc.)
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* UART: 4 or 8 RX/TX UART. Hardware handshaking is supported by the MCU,
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but the boards used for testing do not expose the signals.
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* SPI: 2 or 4 low power SPI interfaces (software implementation available on every pin)
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* I2C: 2 or 4 low power I2C interfaces (software implementation available on every pin)
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* I2S: 3 I2S interfaces
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* ADC: one or two 12-bit SAR ADC converters
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* Ethernet controller
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* Programming: using BootROM bootloader from USB - due to external FlashROM
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and always-available BootROM bootloader, the MIMXRT is not brickable
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The lower numbers for UART, SPI and I2C apply to the i.MXRT 101x MCU.
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For more information see the i.MXRT data sheets or reference manuals.
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NXP provides software support through it's SDK packages.
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