RE: nRF9160 types of reset

NelsonGoncalves — Wed, 28 Apr 2021 09:42:51 GMT

Thanks, it is clearer now.

RE: nRF9160 types of reset

Øivind — Wed, 28 Apr 2021 07:16:50 GMT

Hi,

sys_reboot() will call sys_arch_reboot(), which has a different implementation depending on the system architecture. On the nRF9160, sys_arch_reboot() will ignore the type argument and result in a call to NVIC_SystemReset(), which performs a soft reset.

In Table 17 in "5.1.5.8 Reset behavior" an 'x' denotes what will be reset when the different types of reset are performed. For example, a soft reset will only reset the CPU and modem. RAM may be configured to be retained during System OFF mode. RAM which has not been configured to be retained may be corrupted when performing a watchdog reset. When a power on or brownout reset is performed, all RAM may be corrupted, even RAM configured to be retained.

See section "4.3 VMC — Volatile memory controller" of the nRF9160 Product Specification for information on how to configure RAM blocks to be retained. Note that RAM is never reset, so an 'x' in the reset behavior table only denotes that the contents of the specified RAM type may be corrupted.