Not getting 1.8 volt on the SIM_1V8 pin on custom board

RE: Not getting 1.8 volt on the SIM_1V8 pin on custom board

Sigurd — Mon, 09 Dec 2019 14:35:42 GMT

Could you test with the at_client sample, and check what AT%XSIM? returns ?

Do you get any errors code?

Also check that the SIM-card is inserted correctly in the SIM socket. Some sockets allows the SIM-card to be inserted 2 different ways, but only one way works. And then you need to take the SIM-card out, turn it 180 degrees, and put it back in the socket again.

RE: Not getting 1.8 volt on the SIM_1V8 pin on custom board

stevenminnick — Fri, 06 Dec 2019 13:32:27 GMT

I also tried adding all the rest of the prj.conf options, even if I didn't need them and still no 1.8V. So it's got to be something else I guess.

RE: Not getting 1.8 volt on the SIM_1V8 pin on custom board

stevenminnick — Thu, 05 Dec 2019 14:58:18 GMT

Well I'm trying to make my own project. It's mostly based off the UDP_GPS code sample. And I have the CONFIG_BSD_LIBRARY=y in my prj.conf file. And the 1.8V is off on that pin.

This is my prj.conf file:

CONFIG_NEWLIB_LIBC=y
CONFIG_BSD_LIBRARY=y
CONFIG_GPIO=y
CONFIG_SERIAL=y
CONFIG_STDOUT_CONSOLE=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_TEST_RANDOM_GENERATOR=y
CONFIG_NETWORKING=y
CONFIG_NET_BUF_USER_DATA_SIZE=1
CONFIG_NET_SOCKETS_OFFLOAD=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_POSIX_NAMES=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y
CONFIG_LOG=y
CONFIG_LOG_DEFAULT_LEVEL=4

# Heap and stacks
CONFIG_HEAP_MEM_POOL_SIZE=16384
CONFIG_MAIN_STACK_SIZE=8192
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

CONFIG_MAIN_THREAD_PRIORITY=7

# LTE link control
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_PSM_REQ_RPTAU="00101010"
CONFIG_LTE_PSM_REQ_RAT="00000001"
CONFIG_AT_HOST_LIBRARY=y

CONFIG_LTE_AUTO_INIT_AND_CONNECT=n
CONFIG_LTE_LINK_CONTROL_LOG_LEVEL_DBG=y
CONFIG_LTE_NETWORK_MODE_NBIOT=n
CONFIG_LTE_LEGACY_PCO_MODE=n

It's exactly the same as the sample project that I believe works. But that project also has these items in it's prj.conf file:

CONFIG_FP_SHARING=y
CONFIG_NORDIC_SECURITY_BACKEND=y
CONFIG_CC310_BACKEND=y

 # GPS
CONFIG_NRF9160_GPS=y
CONFIG_NRF9160_GPS_LOG_LEVEL_DBG=y
CONFIG_GPS_USE_EXTERNAL=y
CONFIG_GPS_DEV_NAME="NRF9160_GPS"

CONFIG_GPS_CONTROL=y
CONFIG_GPS_CONTROL_FIRST_FIX_CHECK_DELAY=10
CONFIG_GPS_CONTROL_FIX_COUNT=3
CONFIG_GPS_CONTROL_FIX_CHECK_INTERVAL=120
CONFIG_GPS_CONTROL_FIX_TRY_TIME=360
CONFIG_GPS_CONTROL_PSM_DISABLE_ON_STOP=n

CONFIG_NORDIC_SECURITY_BACKEND=y

So maybe 1.8V is enabled on that pin due to some of these options but it seems odd that these would be necessary.

RE: Not getting 1.8 volt on the SIM_1V8 pin on custom board

Sigurd — Thu, 05 Dec 2019 13:47:41 GMT

[quote userid="76103" url="~/f/nordic-q-a/55241/not-getting-1-8-volt-on-the-sim_1v8-pin-on-custom-board"]I noticed if I put my code[/quote]

What code/sample are you using here ?

I believe you need to have CONFIG_BSD_LIBRARY=y i prj.conf in order for the modem to output 1.8V on the SIM pin.