Unable to allocate a Pipe/Buffer in Driver internal Thread (ncs 2.2.0)

[Kriki]

Hello,
I am currently developing a driver for the ADS1293 from Texas Instruments.

As there is no suitable API for a "EKG AD-Converter" i am not using any overlay API like the Sensor Api.
I am referencing the ADXL372 Interrupt Driven Driver as a Base for processing incoming Data via a Driver internal Thread.

My Problem as stated in the Title is that i cannot allocate a Buffer for a Pipe in the Driver internal Thread.

Im trying to Initialise a Pipe using the:

    int k_pipe_alloc_init(struct k_pipe *pipe, size_t size)

Function.
It Returns the -ENOMEM Error indicating that it cannot Allocate Memory for the Pipe

This problem also extends to allocating a Buffer on the Thread stack like so:
uint8_t isr_rx_buf [10];

The Project Config i use is

CONFIG_PIPES=y

#Enable Logging

CONFIG_LOG=y

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

CONFIG_USE_SEGGER_RTT=y

CONFIG_LOG_BACKEND_RTT=y

CONFIG_LOG_BACKEND_UART=n

CONFIG_ASSERT=y

#Enable SPI for ADS Chip

CONFIG_SPI=y

CONFIG_SPI_NRFX=y

#Sensor Specific Configs

CONFIG_SENSOR=y

CONFIG_SENSOR_LOG_LEVEL_DBG=y

CONFIG_ADS1293=y

#Custom Module

CONFIG_ADS1293_ENABLE_INTERRUPTS=y

CONFIG_ADS1293_DRDYB_INTERRUPT=y

CONFIG_ADS1293_ALARMB_INTERRUPT=y

Im building for a Costum Board Target based on the NRF53 specifically for the nrf5340_cpuapp_ns target

Any Help or Insight on how Kernel Threads and Stacks work in Zephyr would be greatly appreciated

The relevant Driver Snippets can be found here: ads1293_sample.rar
Please note that the Code is unoptimized and filled with LOG_DBG calls as i dont know exactly why it crashes.

[Edvin]

Hello,

Any Help or Insight on how Kernel Threads and Stacks work in Zephyr would be greatly appreciated

For general Zephyr questions I recommend that you reach out to Zephyr's support. I would start here. (link to their discord support channel)

Have you tried giving your stack a bit more resources?

Alternatively, you can try to add a buffer to your struct and use that one for k_pipe_init() : 

unsigned char __aligned(4) my_ring_buffer[100];

Please see:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/kernel/services/data_passing/pipes.html#implementation

Best regards,

Edvin

[Kriki]

Hello,
I have tried giving the Thread Stack more Resources but that didn't help.

But i have just tried adding a Buffer like you said and that worked. I dont know exactly why it works now but all i changed was:

1. Use the unsigned char __aligned(4) my_ring_buffer[100]; you suggested
2. I Specifically didnt use the uin8_t Type, though this should not have an Effect as its the same as unsigned char.

I can now also allocate a uint8_t Buffer.

Thank you for your fast Reply and the Help.

Regards,
Nick