compiling issue for ble_app_uart + spi + TWI

RE: compiling issue for ble_app_uart + spi + TWI

Simon — Thu, 21 Feb 2019 16:50:11 GMT

With nRF52840 you have two TWI peripherals and three SPI peripherals available. However, SPI0 and TWI0 shares the same base address and SPI1 and TWI1 shares the same base address, and can not be used simultaneously.

Here are some solutions:

Use TWI0, TWI1 and SPI2 (if you only need one SPI port)
Let the I2C devices share the TWI0 instance (switch between them by changing address) and use SPI2 and SPI2 (if you need two SPI ports)
Use TWI0, TWI1, SPI1 and SPI2, and turn on and off the instances that shares base address, as suggested by Jørgen here (if you need two SPI ports)

Best regards,

Simon

RE: compiling issue for ble_app_uart + spi + TWI

gauthamranganathan — Wed, 20 Feb 2019 07:08:19 GMT

Hello Simon,

My project is currently using 2 TWI instaces. (nrfx_twi drivers)

I am using the SD card library which uses nrf_drv_spi drivers.

I need an another SPI port. be it using nrfx_spi or nrf_drv_spi .

I went through several posts and i was unable to find an answer.

Preferably without using DMA.

I tried adding an instance of SPIM to my main file. and i get the following error

.\_build\nrf52840_xxaa.axf: Error: L6218E: Undefined symbol nrfx_spim_init (referred from main.o).

I have included nrfx_spim.h and added the respective C file to my project.

I am able to successfully compile and link this line

const nrfx_spim_t m_spi_bus_2 = NRFX_SPIM_INSTANCE(3);

but unable to link nrf_spim_init. I will upload the main file and sdk_config. Please tell me what i can do further

devzone.nordicsemi.com/.../8562.sdk_5F00_config.h devzone.nordicsemi.com/.../2248.main.c

RE: compiling issue for ble_app_uart + spi + TWI

gauthamranganathan — Tue, 19 Feb 2019 12:38:30 GMT

Thank you for your reply Simon. I need 2 instances of SPI and 2 instances of TWI. Could you suggest a solution for this?

I do not want to use DMA as this increases current consumption.

RE: compiling issue for ble_app_uart + spi + TWI

Simon — Tue, 19 Feb 2019 12:11:22 GMT

Have you seen this case, it mentions that SPIM0, SPIS0, TWIM0, TWIS0, SPI0 and TWI0 uses the same registers, and can not be used simultaneously. In your application you have defined both NRF_DRV_SPI_INSTANCE(0) and NRFX_TWI_INSTANCE(0), and is probably what causes this error.

Best regards,

Simon