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eerimoq / simba

Simba Embedded Programming Platform.

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Pin assigment for UART in ESP32

rafacouto opened this issue · comments

commented

Currently, pin assignment for second and third UART in ESP32 port are these ones:

  • UART 1: TX=gpio19 RX=gpio23
  • UART 2: TX=gpio18 RX=gpio05

However, according to the datasheet, the alternate functions of pins (Technical Reference Manual, 4.10 IO_MUX Pad List) should be:

  • UART 1: TX=gpio10 RX=gpio09
  • UART 2: TX=gpio17 RX=gpio16

Moreover, published pinout diagrams like wroom32 show gpio10,09 and gpio17,16 as TX,RX for u1 and u2.

Is the current code right? Should it be changed?

commented

I see no reason not to change it to match the pinout picture. I think the UART driver and pin mapping was implemented before that picture was published, so I just picked pins randomly. Can't remember exactly...