nRF52832 flash write problem.

RE: nRF52832 flash write problem.

nero — Wed, 26 Sep 2018 09:17:46 GMT

That's right ! Generally I ignore the SVC call, but nrf52832 just use it to call api from softdevice!

RE: nRF52832 flash write problem.

Susheel Nuguru — Wed, 26 Sep 2018 08:38:58 GMT

configMAX_SYSCALL_INTERRUPT_PRIORITY needs to be lower in priority than the SVC priority which is set to 4 in nRF52 devices. If you set the priority of configMAX_SYSCALL_INTERRUPT_PRIORITY higher than SVC call then any sd_xxx call that converts to SVC call will hardfault.

RE: nRF52832 flash write problem.

nero — Fri, 21 Sep 2018 13:58:39 GMT

Thank for attention. Accturally, I am developing nrf52832 with freertos, and I found the api of flash must be used the fstorge_sd type when softdevice is present. But I want to use nvmc type. So I must stop ble stack with the sd_adv_stop first. When I ereaser or write flash in a task, it will lead to a hardfault. Finally, I change the priority of configMAX_SYSCALL_INTERRUPT_PRIORITY to APP_LOWEST, and it worked. So I wonder if there is some handle in sd_adv_stop could lead to hardfault when I make the interrupt was controlled by RTOS?

Best regards, Nero

RE: nRF52832 flash write problem.

Simon — Fri, 21 Sep 2018 13:25:36 GMT

If you look at nrf_fstorage_erase(...) in the infocenter and the explantion for the argument len, it says the following: "Number of pages to erase.". Thus you have to input the number of pages, not the size in bytes.

A single page in the nRF52832 is of size 4096 bytes (=0x1000 bytes), and setting the len input to 1 instead, will erase 4*1024 bytes.

Best regards, Simon.