/*  
		C Program to run a pulse density modulation (PDM) Microphone on the nRF9160 Dev Kit using the Nordic SDK
*/

#include <nrf9160.h>
#include <zephyr.h>
#include <misc/printk.h>
#include <string.h>
#include <stdlib.h>
#include <nrfx_pdm.h>
#include <stdint.h>
#include <gpio.h>



#define PDM_BUF_SIZE 3072  //length of buffer in 16 bit words

int16_t pdm_buf[PDM_BUF_SIZE];

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)
{
	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);
}