DMX driver mapped to D21G SERCOM

Hi,

I found this library for DMX: https://github.com/claudeheintz/LXSAMD21DMX

I have tried to use it on the D21G board as a DMX receiver. It compiles OK but I do not receive any data. The library is designed to use SERCOM4. If I understand the board description the RS458 interface is connected to Serial (that should be replaced by the DMX driver) using SERCOM1, but I'm not sure I have undertood how to do the mapping correctly. There is an instruction at the end of the header file that I tried to follow. The changes I have done is:

// +++ Test for SERCOM1
#define PIN_DMX_RX (0ul)
#define PIN_DMX_TX (1ul)
#define PAD_DMX_RX SERCOM_RX_PAD_3
#define PAD_DMX_TX UART_TX_PAD_2

// Set to PIO_SERCOM or PIO_SERCOM_ALT
#define MUX_DMX_RX PIO_SERCOM_ALT
#define MUX_DMX_TX PIO_SERCOM_ALT

// SERCOMn is pointer to memory address where SERCOM registers are located.
#define DMX_SERCOM SERCOM1

// sercomN is C++ wrapper for SERCOMn (passed to UART constructor)
#define DMX_sercom sercom1

Is this the correct settings for the RS485 interface or have I missed something?

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Gunnar Strömme

Gunnar Strömme

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Asked on 6/21/18, 3:54 PM

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