nrf9160 transmit buffer over uart

[MosheSmartAmr]

Hi Guys, 

I was able to connect a second uart to the evaluation board and receive over uart.

however I didnt find an example of how transmit a buffer over uart. 

is there such an example ? 

I did see some example in this post: 

https://devzone.nordicsemi.com/f/nordic-q-a/44788/nrf9160-dk-send-receive-data-from-uart1

however, I didnt understand what are those fifo's , and if I should initialize them ? 

Thanks,

Moshe

[Hakon]

Hello, have you looked at this example?

[MosheSmartAmr]

I have,

this example is only RX. 

[Hakon]

I'm not sure if there is any example that shows explicit use of uart transmission. Have you tried just using uart_fifo_fill()?

 

however, I didnt understand what are those fifo's , and if I should initialize them ? 

 https://en.wikipedia.org/wiki/FIFO_(computing_and_electronics)

In short, a FIFO is just a data buffer where data is read and written in a certain order. I don't think you need to initialize it, I believe it's handled by the kernel when the drivers are initialized.

[MosheSmartAmr]

I get fifo_uart_tx_data undeclared error on it.

Am I missing something?

[Hakon]

What does your .conf file look like?

[MosheSmartAmr]

# General config
CONFIG_NEWLIB_LIBC=y
CONFIG_TEST_RANDOM_GENERATOR=y
CONFIG_ASSERT=y
CONFIG_REBOOT=y
#CONFIG_UART_2_NRF_UARTE=y
CONFIG_SERIAL=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y
CONFIG_UART_INTERRUPT_DRIVEN=y
#CONFIG_HAS_HW_NRF_UARTE3=y
CONFIG_HAS_HW_NRF_UARTE1=y
CONFIG_UART_1_NRF_UARTE=y
CONFIG_UART_1=y
CONFIG_AT_HOST_UART=2
#CONFIG_UART_ASYNC_API=y
# Network
CONFIG_NETWORKING=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_OFFLOAD=y
CONFIG_NRF_CLOUD_PROVISION_CERTIFICATES=y
# MQTT
CONFIG_MQTT_SOCKET_LIB=y
CONFIG_MQTT_LIB_TLS=y
CONFIG_MQTT_MAX_PACKET_LENGTH=2048
CONFIG_NRF_CLOUD_HOST_NAME="aigjres9rg3vv-ats.iot.eu-west-1.amazonaws.com"
CONFIG_NRF_CLOUD_SEC_TAG=3314

# LTE link control
CONFIG_POWER_OPTIMIZATION_ENABLE=y
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_AUTO_INIT_AND_CONNECT=n

# Modem info
CONFIG_MODEM_INFO=y

# BSD library
CONFIG_BSD_LIBRARY=y

# nRF Cloud
CONFIG_NRF_CLOUD=y

# Sensors
CONFIG_GPS_USE_SIM=y
CONFIG_ACCEL_USE_SIM=y

# Library for buttons and LEDs
CONFIG_DK_LIBRARY=y
CONFIG_DK_LIBRARY_INVERT_LEDS=n

# Console
CONFIG_CONSOLE_SUBSYS=y
CONFIG_CONSOLE_HANDLER=y
CONFIG_CONSOLE_GETCHAR=y

# Main thread
CONFIG_MAIN_THREAD_PRIORITY=7

# Heap and stacks
CONFIG_HEAP_MEM_POOL_SIZE=16384
CONFIG_MAIN_STACK_SIZE=8192
CONFIG_GPS_SIM_THREAD_STACK_SIZE=1024
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=1500
CONFIG_HW_STACK_PROTECTION=y

[Hakon]

Have you tried calling uart_fifo_fill() from the uart example I showed you? I tried it and at least it does compile.

[Adeel]

Hi,

I am stuck in the same problem. I looked into the post here: https://devzone.nordicsemi.com/f/nordic-q-a/44788/nrf9160-dk-send-receive-data-from-uart1

I get the same error when I try to combine the code there i.e: fifo_uart_tx_data undeclared error. I could not find it in the uart.h library and wanted to know how is it declared ?

Regards,

Adeel.