UART2 not working in http_application_update example

Question

Hi,

I am using v0.4.0 ncs sdk.

I added following in the nrf9160_pca10090ns.overlay file

&uart2 
{ 
   status = "ok"; 
   current-speed = < 9600 >;
   tx-pin = < 16 >;
   rx-pin = < 17 >;
   rts-pin = < 18 >;
   cts-pin = < 19 >;
};

I added following in the prj.conf file

# UART 2 
CONFIG_SERIAL=y
CONFIG_UART_NRFX=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_UART_2_NRF_UARTE=y

I added following in the application

    struct device   *uart2;
    uart2 = device_get_binding("UART_2");
    uart_irq_callback_set(uart2, UDi_Uart2RxInt);
    uart_irq_rx_enable(uart2);

But when i run the code i am getting hard fault error when "uart_irq_callback_set(uart2, UDi_Uart2RxInt);"

function is called.

***** Booting Zephyr OS 1.14.99 *****<CR><LF>
Exception occurred in Secure State<CR><LF>
***** HARD FAULT *****<CR><LF>
Fault escalation (see below)<CR><LF>
***** BUS FAULT *****<CR><LF>
Precise data bus error<CR><LF>
BFAR Address: 0x50008120<CR><LF>
***** Hardware exception *****<CR><LF>
Current thread ID = 0x20021788<CR><LF>
Faulting instruction address = 0x199ea<CR><LF>
Fatal fault in ISR! Spinning...<CR><LF>

Can you help me in resolving this error ?

Regards,

Smitesh Mali

Didrik Rokhaug · Accepted Answer

I get output from printk, and I am able to transmit data and register an IRQ on UART2. 
 The application tries to establish an LTE connection before it outputs anything. 
 Can you try to disable the automatic connection, just to see if getting the connection takes longer time than you have been waiting for output (it might take several minutes). 
 In your prj.conf file, one of the lines should say 
 CONFIG_LTE_AUTO_INIT_AND_CONNECT=y 
 Please try to change the "y" to "n," and see if you get a line saying " Press Button 1 to start the FOTA download" in your terminal. 
 P.S. 
 Remember to turn the config on again afterwards, so that you are able to get an internet connection

khodidas · Answer

Hi, 
 Making "CONFIG_LTE_AUTO_INIT_AND_CONNECT=n" solved the issue. 
 Now printk and UART2 both are working 
 Regards, 
 Smitesh Mali

UART2 not working in http_application_update example

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