UART0, UART1 and I2C0 utilization and Initialization

RE: UART0, UART1 and I2C0 utilization and Initialization

Sigurd Hellesvik — Fri, 04 Mar 2022 08:10:52 GMT

I ran your sample, and I see your issue.

But I just found the nrfx peripheral resource sharing example.

It explains your problem and show a way to fix it.

Regards,
Sigurd Hellesvik

RE: UART0, UART1 and I2C0 utilization and Initialization

mexco — Thu, 03 Mar 2022 16:02:45 GMT

Hi, the build and Compile is successful, but whrn Debug, then Get_Device_binding(I2C0) fails. Plesae, test the program at your end, sent in just previous reply one earlier.

RE: UART0, UART1 and I2C0 utilization and Initialization

Sigurd Hellesvik — Thu, 03 Mar 2022 07:31:06 GMT

Please post the error message you get.

Regards,
Sigurd Hellesvik

RE: UART0, UART1 and I2C0 utilization and Initialization

mexco — Wed, 02 Mar 2022 17:24:13 GMT

Hello, I tried after adding the configurations in prj.conf, but I2C0 binding is not successful.

Please, test the following Code:

devzone.nordicsemi.com/.../peripheral.txt

RE: UART0, UART1 and I2C0 utilization and Initialization

Sigurd Hellesvik — Wed, 02 Mar 2022 15:12:50 GMT

Could you post the error message you receive?

To get more debug information, set the following configurations in prj.conf:

CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_LOG=y
CONFIG_THREAD_NAME=y

Regards,
Sigurd Hellesvik

RE: UART0, UART1 and I2C0 utilization and Initialization

mexco — Tue, 01 Mar 2022 11:46:46 GMT

Yes, I tried to initializae the I2C0 peripheral using

void init_i2c_master()
{
dev_i2c = device_get_binding("I2C_0");
if (dev_i2c == NULL) {
printk("Failed to get I2C0 binding\n");
return;
}
}

after disable of UART1 using

void disable_uart1(){
NRF_UARTE0->TASKS_STOPTX = 1;
NRF_UARTE0->TASKS_STOPRX = 1;
}

but, I2C initilaize fail, when run Debug .. though build and Compile is successful.

RE: UART0, UART1 and I2C0 utilization and Initialization

Sigurd Hellesvik — Tue, 01 Mar 2022 11:16:48 GMT

Have you tried to disable UART1 in software when using I2C0?

Regards,
Sigurd Hellesvik

RE: UART0, UART1 and I2C0 utilization and Initialization

mexco — Tue, 01 Mar 2022 10:46:04 GMT

Hello, I studied about Peripheral Resource Sharing. I could not find method to switch shared resources between competetive peripherals alernatively. UART1 and I2C0 share same address space and only one should be enabled at a time. Did, you find any ways to multiplex such pripherals ? I need to send the data to UART1 and to I2C0 alternatively and never need both at time. What is metod to use these alteranatively ?

RE: UART0, UART1 and I2C0 utilization and Initialization

Sigurd Hellesvik — Mon, 31 Jan 2022 10:03:21 GMT

I have not been able to find any such API.

Likely you will have to disable and enable the peripherals manually when you change between them.

You might also need to enable the PERIPHERAL_RESOURCE_SHARING_ENABLED, see This DevZone case.

Regards,
Sigurd Hellesvik

RE: UART0, UART1 and I2C0 utilization and Initialization

mexco — Fri, 28 Jan 2022 13:48:44 GMT

Hi Hellsvik, I looking for Zephyr API etc to enable / disbale peripherals woth shared ID and Address space so as to implement in nRF Connect SDK.

RE: UART0, UART1 and I2C0 utilization and Initialization

Sigurd Hellesvik — Fri, 28 Jan 2022 12:41:26 GMT

You should be able to do enable multiple peripherals with the same ID and switch between them in your code.

On how to do this, see nRF5340 Documentation on Peripherals with shared ID and the Peripheral Resource Sharing (PRS).

Is this what you were looking for?

Regards,
Sigurd Hellesvik

RE: UART0, UART1 and I2C0 utilization and Initialization

mexco — Fri, 28 Jan 2022 12:25:27 GMT

Dear Hellesvik, you pointed through the links that TWIM and UARTE have same ID and address space. Therefore, how to do instantiaiton of such Peripherals ? Should instantiaiton be done in Kernel or Programitacally ? If say UART0 has been instantiated in Kernel, then how to disable it and enable I2C0 programitically ? After completiotion of I2C0 transmit/ receive task, how to enabke UART0 again ? I2C0 is to be used as TWIM.

RE: UART0, UART1 and I2C0 utilization and Initialization

Sigurd Hellesvik — Fri, 28 Jan 2022 11:57:39 GMT

See this answer and nRF5340 application core Peripheral instantiation.

Regards,
Sigurd Hellesvik