89 lines
3.6 KiB
ReStructuredText
89 lines
3.6 KiB
ReStructuredText
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.. _samd_general:
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General information about the SAMD port
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=======================================
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The SAMD21/SAMD51 MCU family is a high performance family of devices made by MicroChip.
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The SAMD21 devices are based on an ARM M0+ core, the SAMD51 device on ARM Cortex M4 core.
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They provide many on-chip I/O units for building 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 SAMD21/SAMD51 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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Adafruit ItsyBitsy M0 Express, Adafruit Feather M4 Express and the Adafruit ItsyBitsy M4 Express
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development boards are taken 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 at the moment supported by the port:
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- ADAFRUIT FEATHER M0 EXPRESS
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- ADAFRUIT FEATHER M4 EXPRESS
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- ADAFRUIT ITSYBITSY M0 EXPRESS
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- ADAFRUIT ITSYBITSY M4 EXPRESS
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- ADAFRUIT TRINKET M0
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- MINISAM M4
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- SAMD21 XPLAINED PRO
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- SEEED WIO TERMINAL
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- SEEED XIAO
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To make a generic SAMD 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.
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Please have the manual/pin diagram of your board at hand
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to find correspondence between your board pins and actual SAMD21/SAMD51 pins.
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For the boards listed above, the relation between the board pin number and
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the GPIO number can be found at :ref:`samd_pinout`.
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* The pins that can be used by MicroPython are limited to those listed
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in the board definition files.
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Technical specifications and SoC data sheets
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--------------------------------------------
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The data sheets and other reference material for SAMD21/SAMD51 chip are available
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from the vendor site: https://www.microchip.com/en-us/products/microcontrollers-and-microprocessors/32-bit-mcus/sam-32-bit-mcus
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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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SAMD21:
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* Architecture: ARM Cortex M0+
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* CPU frequency: up to 48MHz
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* Total RAM available: up to 32 kB (see table)
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* Internal FlashROM: up to 256 kB
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Some boards provide additional external SPI flash.
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* GPIO: up to 52 (GPIOs are multiplexed with other functions, including
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external FlashROM, UART, etc.)
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* UART: up to 6 serial devices, which can used for UART, SPI or I2C.
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* I2S: 1 I2S interfaces
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* ADC: One 12-bit SAR ADC converter with 16 channels.
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* Programming: using BootROM bootloader from USB.
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SAMD51:
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* Architecture: ARM Cortex M4
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* CPU frequency: up to 120MHz
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* Total RAM available: up to 256 kB
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* Internal FlashROM: up to 1 MB
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Some boards provide additional external SPI flash.
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* GPIO: up to 99 (GPIOs are multiplexed with other functions, including
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external FlashROM, UART, etc.)
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* UART: up to 8 serial devices, which can used for UART, SPI or I2C.
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* I2S: 1 I2S interfaces
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* ADC: Dual 12-bit SAR ADC converter with 16 channels.
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* Programming: using BootROM bootloader from USB.
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For more information see the excellent SAMD21/SAMD51 data sheets or reference manuals.
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At the moment, the SAM21 port of MicroPython requires 256kB flash, of which 64kB is used
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for a small file system. The SAM51 port requires 512 kB of flash, of which all flash beyond
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384kB is used for a file system. Some boards have additional flash memory, which can be used
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as additional file space.
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