Asset Tracker + Uart DMA

[MosheSmartAmr]

Hi,

I'm Trying to add uart with DMA functionality to the asset tracker sample code. 

but when running : 

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uart_callback_set(uart_wifi, uart_callback_algo, uart_wifi);

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uart_callback_set(uart_wifi, uart_callback_algo, uart_wifi);

I get: 

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Exception occurred in Secure State

***** HARD FAULT *****

Fault escalation (see below)

***** BUS FAULT *****

Precise data bus error

BFAR Address: 0x50008120

***** Hardware exception *****

Current thread ID = 0x20027910

Faulting instruction address = 0x2ed76

Fatal fault in ISR! Spinning...

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Exception occurred in Secure State
***** HARD FAULT *****
  Fault escalation (see below)
***** BUS FAULT *****
  Precise data bus error
  BFAR Address: 0x50008120
***** Hardware exception *****
Current thread ID = 0x20027910
Faulting instruction address = 0x2ed76
Fatal fault in ISR! Spinning...

this is my nrf9160_pca10090ns.overlay : 

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&uart1 {

current-speed = <115200>;

compatible = "nordic,nrf-uarte";

status = "okay";

tx-pin = <19>;

rx-pin = <18>;

};

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&uart1 {
current-speed = <115200>;
compatible = "nordic,nrf-uarte";
status = "okay";
tx-pin = <19>;
rx-pin = <18>;
};

these flags I added to prj.conf:

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CONFIG_SERIAL=y

CONFIG_UART_ASYNC_API=y

CONFIG_UART_1_NRF_UARTE=y

CONFIG_ARM_MPU=n

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  CONFIG_SERIAL=y
  CONFIG_UART_ASYNC_API=y
  CONFIG_UART_1_NRF_UARTE=y
  CONFIG_ARM_MPU=n

any idea how to make this work? 

BTW, I was able to make the uart work without using the DMA.

thanks !