nRF52832 Enabling UART easyDMA results in global variables being assigned random values

[lzq597]

IDE：SES for ARM V5.42a

SDK：nRF5_SDK_16.0.0

I am develop BLE device with nRF52832. I found that some global variables were assigned ramdom values if I enable UART easyDMA. If UART easyDMA is disabled, this bug will not occur.These global variables should be zero. Because I have already initialised them to zero.

The address of m_rx_fifo in app_uart_fifo.c is 0x20004688, The address of m_rx_fifo in app_uart_fifo.c is 0x20004698.

The address of global variables assigned random values is 0x20005660.

m_rx_fifo address = 0x20004688
m_tx_fifo address = 0x20004698

ble_sleep_count = 143, addr = 0x20005660

msg_type:255, addr = 0x20005661

data_get[0] = 96, addr = 0x20005664

[Turbo J]

That usually means you have a big stack or buffer overflow somewhere in your code.

Try migrating to NCS SDK, I believe they have MPU setups that can tell you some stack overflows for NRF52xxx MCUs.