hello, nordic's engineers, need your help.
(1) the first problem : can not set VDD output to 3.3V
From nRF52840_Product_Specification_v0.5, it says:
High voltage mode is entered when the supply voltage is only connected
to the VDDH pin and the VDD pin is not connected to any voltage supply. In high voltage mode, the output from REG0 can be used for supplying external circuitry from the VDD pin.
Our nRF52840 is using High voltage mode, so nRF52840 is powered by VDDH pin,
and voltage of VDDH is 5V; Then we set REGOUT0 and EXTSUPPLY like following
NRF_UICR->REGOUT0 = 5;//3.3V
NRF_UICR->EXTSUPPLY = 1;//enable
but the output of VDD pin is still 1.8V， why?
(2)the second problem : can't set radio tx power
we want increase radio tx power, but it seems that the setting does not
take effect
source code : sd_ble_gap_tx_power_set(8);
(3) add debug source code to read back register value, and print:
NRF_LOG_INFO("NRF_UICR->REGOUT0 %d\r\n", NRF_UICR->REGOUT0);
NRF_LOG_INFO("NRF_UICR->EXTSUPPLY %d\r\n", NRF_UICR->EXTSUPPLY);
NRF_LOG_INFO("NRF_RADIO->TXPOWER %d\r\n", NRF_RADIO->TXPOWER);
debug onformation got form terminal:
APP:INFO: NRF_UICR->REGOUT0 -1
APP:INFO: NRF_UICR->EXTSUPPLY -1
APP:INFO: NRF_RADIO->TXPOWER 0
oh, my god, The setting data is not written in , why? why? why?
very strange :
NRF_UICR->REGOUT0 and NRF_UICR->EXTSUPPLY are
always -1(default value when power on), NRF_RADIO->TXPOWER
is 0(default value when power on) at most of time ,
but some times is 8(our setting value).
debug information printed to UART:
APP:INFO: NRF_UICR->REGOUT0 -1
APP:INFO: NRF_UICR->EXTSUPPLY -1
APP:INFO: NRF_RADIO->TXPOWER 8
APP:INFO: NRF_UICR->REGOUT0 -1
APP:INFO: NRF_UICR->EXTSUPPLY -1
APP:INFO: NRF_RADIO->TXPOWER 0
APP:INFO: NRF_UICR->REGOUT0 -1
APP:INFO:NRF_UICR->EXTSUPPLY -1
APP:INFO:NRF_RADIO->TXPOWER 0
thank you very much!
