nrf52840 flashing

[madhu]

Hi,

I have bought a new nrf52840 PDK. I have gone through the PDK user guide and I came to know that we can use qspi pins as gpios by cutting the Solder bridge connections. This is the phrase:

"To use the GPIOs for a purpose other than the onboard external memory and have them available on the P24 connector, six solder bridges (SB10–SB15) must be cut and six solder bridges (SB20–SB25) must be shorted. See Figure 19: Configuring GPIOs for external memory on page 25 for details."

I have tried cutting the SB(10-15) and shorted SB(20-25) and when I tried to load a gpio(blinky) program, program loading is getting stuck at Initializing Qspi. Why it is not able to flash ? How to program without Qspi?

Thanks and regards R Madhu.

[Jørgen Holmefjord]

Hi,

By setting MemSize = 0x000000 in QspiDefault.ini, found in the nrfjprog install directory (typically C:\Program Files (x86)\Nordic Semiconductor\nrf5x\bin), you should be able to flash your device without QSPI.

Best regards,

Jørgen

[madhu]

Thanks Holmefjord.
By changing so i am able to flash it well. Next i loaded qspi periperal example with an external slave device connected to gpio pins to which qspi is shorted. In the main function i modified the code to perform read and write operations only one time. But on executing i'm seeing clock transfer continuously.

Why it is happening so, you have any idea?

Thanks and Regards. R Madhu.

[Jørgen Holmefjord]

Which slave device did you connect? Did you edit the code to send commands supported by the device?

[madhu]

I have connected a radio transceiver which is interfaced through spi. And my target is to read the device registers which are 8bit addressed @16MHz Clock. I have just changed read length to 4 and also commented configure_memory and spi_erase apis in qspi example code. I have observed that "nrf_qspi_event_check" api is waiting for the event ready, which is causing the continuous read operation.

[Jørgen Holmefjord]

You may need some configuration of the newly connected device. I suggest that you post this as a separate question, as it does not relate to the initial question. This makes the questions and answer more searchable and keeps the site clean. I also suggest that you provide some more details on your issue, preferably with some code examples.