main.c

/**************************************************************************//**
 * @file     spi_flash.c
 * @brief    Read/write Flash via SPI interface
 *
 * @note
 * Copyright (C) 2018 Nuvoton Technology Corp. All rights reserved.
 *
 ******************************************************************************/
#include <stdio.h>
#include <string.h>

#include "N9H30.h"
#include "sys.h"
#include "i2s.h"
#include "i2c.h"

#define BUF_LENGTH  16*1024
#define BUF_HALF_LENGTH 8*1024

// use master or slave mode
#define MASTER_MODE

#ifdef __ICCARM__
#pragma data_alignment = 32
static uint32_t u32PlayBuf[BUF_LENGTH];
static uint32_t u32RecBuf[BUF_LENGTH];
#else
static uint32_t u32PlayBuf[BUF_LENGTH] __attribute__((aligned(32)));;
static uint32_t u32RecBuf[BUF_LENGTH] __attribute__((aligned(32)));;
#endif

static uint32_t volatile u32BuffIdx=0;
static uint32_t *pbuf, *rbuf;

void Delay(int count)
{
	volatile uint32_t i;
	for (i = 0; i < count ; i++);
}

void play_callback(uint32_t u32Sn)
{
	if(u32Sn == 1)
	{
		/* First half of buffer can be copied from Rx buffer */
		u32BuffIdx = 0;
	}
	else
	{
		/* Last half of buffer can be copied from Rx buffer */
		u32BuffIdx = BUF_HALF_LENGTH;
	}
}

void rec_callback(uint32_t u32Sn)
{
	if(u32Sn == 1)
	{
		/* Copy data form Rx buffer to Tx buffer */
		memcpy((void *)(pbuf + u32BuffIdx), (void *)rbuf, BUF_HALF_LENGTH*sizeof(uint32_t));
	}
	else
	{
		/* Copy data form Rx buffer to Tx buffer */
		memcpy((void *)(pbuf + u32BuffIdx), (void *)(rbuf + BUF_HALF_LENGTH), BUF_HALF_LENGTH*sizeof(uint32_t));
	}
}

/*---------------------------------------------------------------------------------------------------------*/
/*  Write 9-bit data to 7-bit address register of NAU8822 with I2C0                                        */
/*---------------------------------------------------------------------------------------------------------*/
void I2C_WriteNAU8822(uint8_t u8addr, uint16_t u16data)
{
    uint8_t TxData[2];
    
retry:    
    TxData[0] = (uint8_t)((u8addr << 1) | (u16data >> 8));
    TxData[1] = (uint8_t)(u16data & 0x00FF);
    
    i2cIoctl(0, I2C_IOC_SET_SUB_ADDRESS, TxData[0], 0);
    if(i2cWrite(0, &TxData[0], 2) != 2)
        goto retry;
}

/*---------------------------------------------------------------------------------------------------------*/
/*  NAU8822 Settings with I2C interface                                                                    */
/*---------------------------------------------------------------------------------------------------------*/
void NAU8822_Setup()
{
    sysprintf("\nConfigure NAU8822 ...");

    I2C_WriteNAU8822(0,  0x000);   /* Reset all registers */
    Delay(0x200);

    //input source is MIC
    I2C_WriteNAU8822(1,  0x03F);
    I2C_WriteNAU8822(2,  0x1BF);   /* Enable L/R Headphone, ADC Mix/Boost, ADC */
    I2C_WriteNAU8822(3,  0x07F);   /* Enable L/R main mixer, DAC */
    I2C_WriteNAU8822(4,  0x010);   /* 16-bit word length, I2S format, Stereo */
    I2C_WriteNAU8822(5,  0x000);   /* Companding control and loop back mode (all disable) */
#ifndef MASTER_MODE
    I2C_WriteNAU8822(6,  0x1AD);   /* Divide by 6, 16K */
    I2C_WriteNAU8822(7,  0x006);   /* 16K for internal filter coefficients */
#endif    
    I2C_WriteNAU8822(10, 0x008);   /* DAC soft mute is disabled, DAC oversampling rate is 128x */
    I2C_WriteNAU8822(14, 0x108);   /* ADC HP filter is disabled, ADC oversampling rate is 128x */
    I2C_WriteNAU8822(15, 0x1EF);   /* ADC left digital volume control */
    I2C_WriteNAU8822(16, 0x1EF);   /* ADC right digital volume control */
    I2C_WriteNAU8822(44, 0x033);   /* LMICN/LMICP is connected to PGA */
    I2C_WriteNAU8822(50, 0x001);   /* Left DAC connected to LMIX */
    I2C_WriteNAU8822(51, 0x001);   /* Right DAC connected to RMIX */

    sysprintf("[OK]\n");
}
int32_t main(void)
{
	outpw(REG_CLK_HCLKEN, 0x0527);
	outpw(REG_CLK_PCLKEN0, 0);
	outpw(REG_CLK_PCLKEN1, 0);
	
	sysDisableCache();
    sysFlushCache(I_D_CACHE);
    sysEnableCache(CACHE_WRITE_BACK);
    sysInitializeUART();
	
	/* Configure multi function pins to I2S */
    outpw(REG_SYS_GPG_MFPH, (inpw(REG_SYS_GPG_MFPH) & ~0x0FFFFF00) | 0x08888800);
	
    /* Configure multi function pins to I2C0 */
	outpw(REG_SYS_GPG_MFPL, (inpw(REG_SYS_GPG_MFPL) & ~0xffff) | 0x88);
    
	// Initialize I2S interface
    i2sInit();
    if(i2sOpen() != 0)
        return 0;
         
    // Select I2S function
    i2sIoctl(I2S_SELECT_BLOCK, I2S_BLOCK_I2S, 0);
    // Select 16-bit data width
    i2sIoctl(I2S_SELECT_BIT, I2S_BIT_WIDTH_16, 0);
    
    // Set DMA interrupt selection to half of DMA buffer
    i2sIoctl(I2S_SET_PLAY_DMA_INT_SEL, I2S_DMA_INT_HALF, 0);
    i2sIoctl(I2S_SET_REC_DMA_INT_SEL, I2S_DMA_INT_HALF, 0);
    
    // Set to stereo 
    i2sIoctl(I2S_SET_CHANNEL, I2S_PLAY, I2S_CHANNEL_P_I2S_TWO);
	i2sIoctl(I2S_SET_CHANNEL, I2S_REC, I2S_CHANNEL_R_I2S_TWO);
    
    // Set DMA buffer address
    i2sIoctl(I2S_SET_DMA_ADDRESS, I2S_PLAY, (uint32_t)u32PlayBuf);
    i2sIoctl(I2S_SET_DMA_ADDRESS, I2S_REC, (uint32_t)u32RecBuf);
	
    // Put to non cacheable region
	pbuf = (uint32_t *)((uint32_t)u32PlayBuf | (uint32_t)0x80000000);
	rbuf = (uint32_t *)((uint32_t)u32RecBuf | (uint32_t)0x80000000);
    
    // Set DMA buffer length
    i2sIoctl(I2S_SET_DMA_LENGTH, I2S_PLAY, sizeof(u32PlayBuf));
    i2sIoctl(I2S_SET_DMA_LENGTH, I2S_REC, sizeof(u32RecBuf));
    
    // Select I2S format
    i2sIoctl(I2S_SET_I2S_FORMAT, I2S_FORMAT_I2S, 0);

#ifdef MASTER_MODE
    //12.288MHz ==> APLL=98.4MHz / 8 = 12.3MHz
    
    //APLL is 98.4MHz
    outpw(REG_CLK_APLLCON, 0xC0008028);
	
	// Select APLL as I2S source and divider is (7+1)
    outpw(REG_CLK_DIVCTL1, (inpw(REG_CLK_DIVCTL1) & ~0x001f0000) | (0x2 << 19) | (0x7 << 24));
	
	// Set sampleing rate is 16k, data width is 16-bit, stereo
    i2sSetSampleRate(12300000, 16000, 16, 2);
    
    // Set as master
    i2sIoctl(I2S_SET_MODE, I2S_MODE_MASTER, 0);
#else    
    // Set as slave, source clock is XIN (12MHz)
    i2sIoctl(I2S_SET_MODE, I2S_MODE_SLAVE, 0);
#endif
    
    // Set play and record call-back functions
    i2sIoctl(I2S_SET_I2S_CALLBACKFUN, I2S_PLAY, (uint32_t)&play_callback);
    i2sIoctl(I2S_SET_I2S_CALLBACKFUN, I2S_REC, (uint32_t)&rec_callback);
    
    // Initialize I2C-0 interface
    i2cInit(0);
    if(i2cOpen(0) != 0)
        return 0;
    
    // Set slave address is 0x1a
    i2cIoctl(0, I2C_IOC_SET_DEV_ADDRESS, 0x1A, 0);
	// I2C interface speed is 100KHz
    i2cIoctl(0, I2C_IOC_SET_SPEED, 100, 0);
    
    // Configure NAU8822 audio codec
    NAU8822_Setup();
    
    // Start playing and recording
    sysprintf("Start playing & recording ...\n");
    i2sIoctl(I2S_SET_RECORD, I2S_START_REC, 0);
    i2sIoctl(I2S_SET_PLAY, I2S_START_PLAY, 0);
    
    while(1);    
}