Hi KAROL, Thank you :) As per the procedure - I have added the key matrix HAL driver. - Then enabled the interrupt. - In the key matrix HAL driver, wrote the user_keypad_callback as a callback function - Selected the channel 1 - Interrupt enable after initialization is true. - In keypad thread i have written ssp_err_t err; err = g_kint.p_api- open(&g_kint.p_ctrl, g_kint.p_cfg); if (err != SSP_SUCCESS) { while(1); } tx_thread_sleep (50); In user_keypad_callback function one led blinking code is written. If i am not wrong, when the key is pressed the code should go into callback function but it is not. So what could possibly go wrong ?? Regards
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