Hi
I am working on interfacing PDM mic (Adafruit PDM MEMS Microphone) with nRF9160 DK, I used AT Client sample as a base code and I have added all rest code from the following ticket devzone.nordicsemi.com/.../pdm-working step by step and other related tickets. my project is successfully build but when i flashed it in nRF9160 DK I am getting repeated output in LTE link monitor as shown below in txt file. The output keep repeating information about SPM which I did not change anything in please find the attached code below. Thank you
/* * Copyright (c) 2018 Nordic Semiconductor ASA * * SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic */ #include <zephyr.h> #include <stdio.h> #include <drivers/uart.h> #include <string.h> #include <nrfx_pdm.h> #include <hal/nrf_gpio.h> #include <nrf9160.h> #define PDM_BUF_SIZE 3072 //length of buffer in 16 bit words int16_t pdm_buf[PDM_BUF_SIZE]; /**@brief Recoverable BSD library error. */ void bsd_recoverable_error_handler(uint32_t err) { printk("bsdlib recoverable error: %u\n", err); } void nrfx_pdm_event_handler(nrfx_pdm_evt_t const *const p_evt) { if (p_evt->buffer_requested) { nrfx_pdm_buffer_set(pdm_buf, PDM_BUF_SIZE); } if (p_evt->buffer_released != 0) { printk("Out: %4x @ 0x%x\r\n %4x @ 0x%x\r\n", (uint16_t)pdm_buf[0], &pdm_buf[0], (uint16_t)pdm_buf[1], &pdm_buf[1]); } } static void pdm_init(void) { nrfx_pdm_config_t pdm_config = NRFX_PDM_DEFAULT_CONFIG( 10, 11); /*configures CLK to pin 10 and Din to pin 11*/ nrfx_pdm_init(&pdm_config, nrfx_pdm_event_handler); } /*ISR workaround given by Nordic*/ ISR_DIRECT_DECLARE(pdm_isr_handler) { nrfx_pdm_irq_handler(); ISR_DIRECT_PM(); /* PM done after servicing interrupt for best latency */ return 1; /* We should check if scheduling decision should be made */ } void main(void) { printk("The AT host sample started\n"); { IRQ_DIRECT_CONNECT(PDM_IRQn, 0, pdm_isr_handler, 0); //workaround line printk("Starting PDM program!\n"); printk("PDM Buffer size: %d in 16 bit words\n", PDM_BUF_SIZE); /* bool enabled = nrfx_pdm_enable_check(); printk(enabled ? "true/n" : "false\n"); */ pdm_init(); printk("%4x is the starting address\n", &pdm_buf); printk("%4x is current value at %x\n", pdm_buf[0], &pdm_buf); printk("The PDM will start reading NOW...\n"); /* for (int i = 0; i < 500; i++) { int k = 5; for (volatile int j = 0; j < 50; j++) { k = !k; } }*/ nrfx_pdm_start(); for (int i = 0; i < 100; i++) { int k = 5; for (volatile int j = 0; j < 100; j++) { k = !k; } } nrfx_pdm_stop(); printk("%4x is current value at %x\n", pdm_buf[0], &pdm_buf); } }