Hi folks We want to migrate from WiFi based Particle (Photon) to cellural. SoMs like B524/B404X looks good except single available UART. Maybe there is some SoftwareSerial library available for such a modules? As far we are designing our custom PCB around it I am open to any solutions Best, Bo…

The best solution is a SC16IS740 SPI or I2C UART. This library works very well on the B Series SoM. There are several models with different capabilities like the SC16IS750 and SC16IS760 that also work with that library. Software serial doesn't work very well because of limited hardware timers and u…

Thanks, nice finding. As far I would need 2xUARTs I would prefer SC16IS760. Does library support 2xUARTs of single SC16IS760? For highest performance/speed with the library you would recommend stick to I2C or SPI? Best, Bogdan

You can connect two SC16IS740 or 750 to the same SPI bus and that works right now. The SC16IS752/762 dual UART is almost two of the other chips in a single package. The library doesn't currently work with it, but I looked at it several years ago and it didn't seem like it would be difficult but I n…

@PoCLab , what is the maximum baud rate you expect? These devices have 64 byte receive and transmit FIFOs and will generate an interrupt when they read a preset level. Using SPI is best so you can move the data on or off the device as quickly as possible. However, at high baud rates, servicing the…

In my Application sometimes I get burst of data up to 4KB on 38400 And would like to have a large buffer to be safer about potential overflows and data loss And as far current implementation of @rickkas7 lib not using interrupts/they are tricky on nRF52. I think unless I am fastly start reading af…

Interrupts won't help because you can't start an SPI transaction from an ISR. That's why the library doesn't support it for sending and receiving. Instead you should handle the requests from a worker thread, which will be more than fast enough to read 4K of data at 38400.

[image] SC16IS7xxRK hardware SPI and I2C hardware UART library Libraries This library supports the SC16IS740, SC16IS750, SC16IS760 single UART and SC16IS752, SC16IS762 dual hardware UART chips. Additionally you can add multiple chips to a single SPI or I2C bus for even mo…

@rickkas7 We have an HW setup with 2xSC16IS740 shared SPI lanes and dedicated CS for each IC. Can you help me understand the proper initialization for 2 UARTs? My understanding that it's should be somehow similar to a dual port IC example. A short example would be highly appreciated. We are testin…

Use the SC16IS7xxRK library (not the older one) Create two SC16IS7x0 objects, one for each chip, typically as global variables. SC16IS7x0 serialA; SC16IS7x0 serialB; Initialize them with the appropriate CS pin and settings, typically from setup(): serialA .withSPI(&SPI, D2, 4)…

How can I use 2xSC16IS740 with shared SPI lines and a dedicated CS for each IC to switch between them on the fly instead of changing the CS pin status every time I want to send data to one of the two SC16IS740 Here's the code I use, when sending a sentence through serialA (with SC16IS740 channel A …

Do not attempt to control the CS pins directly. It won't work. If you want to make something that you can switch between ports, store the pointer to the one you want in a variable of type Print. For example: Print *port = &SerialA; port->println("UART A working"); delay(1000); port = &SerialB; p…

Possibility to obtain 2 UARTs on B524/B404x

Hardware

rickkas7 August 21, 2023, 10:08am 8

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Possibility to obtain 2 UARTs on B524/B404x

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