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JTiru.1
JTiru.1
Associate
June 9, 2020
Question

i want to use dual core board with linux operating system . it should have atleast 55 I/O pins with support for ADC and DAC. which board is best

  • June 9, 2020
  • 3 replies
  • 1988 views

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3 replies

berendi
berendi
Principal
June 9, 2020

All of the 55 I/O pins should support ADC and DAC? No way. There are 2 DAC channels, and maybe a dozen ADC on STM32 MCUs/MPUs. Use external ADC/DAC parts connected to the SPI bus.

Otherwise check out the STM32MP1 series.

JTiru.1
JTiru.1Author
Associate
June 9, 2020

I do not want all pins to support DAC or ADC. But I need 55 GP IO pins. I checked STM32MP1 board. It has about 40 GP IO pins.

Danish1
Danish1
Lead III
June 9, 2020

"Best" is a subjective term.

I do not think any of the stm32 microcontrollers will run linux, but the STM32MP1 will.

There are such things as "IO Expanders" chips that connect over I2C or SPI and provide 8, 16 or more I/O lines. I used to like MAX6956 because you could control the brightness of LEDs without having to resort to PWM, and newer ones of these have built-in PWM for the brightness.

But unless you expand on how you intend to use all those GPIO lines, it is hard to advise further.

Tesla DeLorean
Tesla DeLorean
Guru
June 9, 2020

Or latches/buffers banked on the external bus (FSMC/FMC) to provide parallel access. Also attachment of things through a CPLD which would manage high rate interactions on the pin whilst decimating loading on the processor for interrupts, etc.

Trade-offs in size/cost, pin escape and desire to use LQFP vs BGA

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Jack Peacock_2
Jack Peacock_2
Associate II
June 9, 2020

You might be better off with one of the commercial Cortex A series boards built around an A7 or better multi-core application processor, rather than an eval board. There are quite a few sources for these if you do a search. They will have a BSP already configured for the board and better support than what you'll get with ST Cube software.

Jack Peacock

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