I connected it to an external mcu as shown below. After downloading serial lte modem to nrf9160,
at command is sent, but it does not respond. Connect only 3 pins for communication with external MCU (tx, rx, gnd)
rx ------ p0.20
tx ------- p0.19
The settings are as follows.
----------------------------- nrf9160_ns.conf file setting --------------------
# Configuration file for nRF9160DK.
# This file is merged with prj.conf in the application folder, and options
# set here will take precedence if they are present in both files.
# Use UART_0 (when working with PC terminal)
# unmask the following config
#CONFIG_SLM_CONNECT_UART_0=y
#CONFIG_UART_0_NRF_HW_ASYNC_TIMER=2
#CONFIG_UART_0_NRF_HW_ASYNC=y
#CONFIG_SLM_WAKEUP_PIN=6
#CONFIG_SLM_INDICATE_PIN=2
# Use UART_2 (when working with external MCU)
# unmask the following config
CONFIG_SLM_CONNECT_UART_2=y
CONFIG_UART_2_NRF_HW_ASYNC_TIMER=2
CONFIG_UART_2_NRF_HW_ASYNC=y
CONFIG_SLM_WAKEUP_PIN=20
CONFIG_SLM_INDICATE_PIN=30
--------------------------------------------------------------------
--------------------- overay file setting -------------------------------
&uart0 {
status = "disabled";
};
&uart2 {
compatible = "nordic,nrf-uarte";
current-speed = <115200>;
status = "okay";
//hw-flow-control;
pinctrl-0 = <&uart2_default_alt>;
pinctrl-1 = <&uart2_sleep_alt>;
pinctrl-names = "default", "sleep";
};
&i2c2 {
status = "disabled";
};
&pinctrl {
uart2_default_alt: uart2_default_alt {
group1 {
psels = <NRF_PSEL(UART_TX, 0, 19)>,
<NRF_PSEL(UART_RX, 0, 18)>;
//<NRF_PSEL(UART_RTS, 0, 12)>,
//<NRF_PSEL(UART_CTS, 0, 13)>;
};
};
uart2_sleep_alt: uart2_sleep_alt {
group1 {
psels = <NRF_PSEL(UART_TX, 0, 19)>,
<NRF_PSEL(UART_RX, 0, 18)>;
//<NRF_PSEL(UART_RTS, 0, 12)>,
//<NRF_PSEL(UART_CTS, 0, 13)>;
low-power-enable;
};
};
};
---------------------------------------------------------------------
I checked that the external mcu sends data at 11520bps well, but the nrf9160 does not respond at all.
Can you tell me why?
Can you tell me why?
If you have experience, please advise. thank you.
