File content as of revision 0:d616ca59aad8:

/*
 * Example to demonstrate usage of the nrf52's I2S interface
 *
 * Made by Jurica Resetar @ aconno
 * jurica_resetar@yahoo.com
 * More info @ aconno.de
 *
 * All rights reserved
 *
 */
 
#include "mbed.h"
#include "acd52832_bsp.h"

#define MY_BUF_SIZE     3*8*2
#define LANC_H      0xFFFF, 0xFFFF, 0xFFFF
#define LANC_L      0x0000, 0x0000, 0x0000

/*
 *  Bitovi na I2S bus idu od MSBa do LSBa
 */

#define REC_CMD_1           (0x18)      // 0xE7  or 0x18
#define REC_CMD_2           (0x33)      // 0xCC  or 0x33

uint16_t my_tx_buf[MY_BUF_SIZE] = {LANC_L,LANC_L,LANC_L,LANC_H, LANC_H,LANC_L,LANC_L,LANC_L,  LANC_L,LANC_L,LANC_H,LANC_H,LANC_L,LANC_L,LANC_H,LANC_H};
uint8_t my_rx_buf[10] = {};
uint8_t flag = 0;
InterruptIn button(PIN_BUTTON);

void sendCommand(void){
    NRF_I2S->TASKS_START = 1;
    while(!NRF_I2S->EVENTS_TXPTRUPD);    // Wait for the data to be send
    NRF_I2S->EVENTS_TXPTRUPD = 0;
    flag = 1;
}

int main(void){
    NRF_I2S->CONFIG.RXEN = 0;       // Disable reception
    NRF_I2S->CONFIG.TXEN = 1;       // Enable transmission
    NRF_I2S->CONFIG.MCKEN = 1;      // Enable MCK generator
    
    //NRF_I2S->CONFIG.MCKFREQ = 0x04100000; // DIV 63
    //NRF_I2S->CONFIG.RATIO = 0;        // Ratio = 32x
    NRF_I2S->CONFIG.MCKFREQ = 0x08200000; // DIV 31
    NRF_I2S->CONFIG.RATIO = 2;          // Ratio = 64x
    
    NRF_I2S->CONFIG.SWIDTH = 1;         // Sample width = 16 bit
    NRF_I2S->CONFIG.ALIGN = 1;          // Alignment = Right
    NRF_I2S->CONFIG.FORMAT = 0;         // Format = I2S
    NRF_I2S->CONFIG.CHANNELS = 0;       // Use stereo
    
    
    // In debug mode
    NRF_I2S->PSEL.LRCK = 26;            // LRCK routed to pin 26
    NRF_I2S->PSEL.SDOUT = 28;           // SDOUT routed to pin 28
    NRF_I2S->PSEL.SCK = 30;             // SCK routed to pin 30
    NRF_I2S->PSEL.MCK = 0x80000000;     // MCK disconnected
    NRF_I2S->PSEL.SDIN = 0x80000000;    // SDIN disconnected
    
    NRF_I2S->TXD.PTR = (uint32_t)my_tx_buf;
    NRF_I2S->RXD.PTR = (uint32_t)my_rx_buf;
    NRF_I2S->RXTXD.MAXCNT = MY_BUF_SIZE/2;      // Ajde ustanovi zašto pobogu /2
    
    NRF_I2S->ENABLE = 1;
    //NRF_I2S->TASKS_START = 1;
    
    button.rise(sendCommand);
    while(1){
        if(flag){
            wait_ms(50);
            NRF_I2S->TASKS_STOP = 1;
            while(!NRF_I2S->EVENTS_STOPPED);
            NRF_I2S->EVENTS_STOPPED = 0;
            flag = 0;
        }
    }   
}