/**************************************************************************//**
 * @file     main.c
 * @version  V0.10
 * @brief    This is a I2S demo for playing and recording data with PDMA function.
 *
 * SPDX-License-Identifier: Apache-2.0
 * @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include <string.h>
#include "NuMicro.h"

//------------------------------------------------------------------------------
#define I2S_TX_DMA_CH   1
#define I2S_RX_DMA_CH   2

#define BUFF_LEN        4

/*---------------------------------------------------------------------------------------------------------*/
/* Global variables                                                                                        */
/*---------------------------------------------------------------------------------------------------------*/
DSCT_T g_asDescTable_TX[2], g_asDescTable_RX[2];

/* Function prototype declaration */
void SYS_Init(void);

/* Global variable declaration */
volatile uint8_t u8TxIdx = 0, u8RxIdx = 0;
volatile uint32_t u32PlayReady = 0, u32RecReady = 0;
uint32_t g_au32PcmRxBuff[2][BUFF_LEN] = {0};
uint32_t g_au32PcmTxBuff[2][BUFF_LEN] = {0};

//------------------------------------------------------------------------------
/* Once PDMA has transferred, software need to reset Scatter-Gather table */
void PDMA_ResetTxSGTable(uint8_t id)
{
    g_asDescTable_TX[id].CTL |= PDMA_OP_SCATTER;
    g_asDescTable_TX[id].CTL |= ((BUFF_LEN - 1) << PDMA_DSCT_CTL_TXCNT_Pos);
}

/* Once PDMA has transferred, software need to reset Scatter-Gather table */
void PDMA_ResetRxSGTable(uint8_t id)
{
    g_asDescTable_RX[id].CTL |= PDMA_OP_SCATTER;
    g_asDescTable_RX[id].CTL |= ((BUFF_LEN - 1) << PDMA_DSCT_CTL_TXCNT_Pos);
}

/*---------------------------------------------------------------------------------------------------------*/
/*  Main Function                                                                                          */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
    uint32_t u32InitValue, u32DataCount;
    volatile int32_t i32TimeoutCount = SystemCoreClock;

    /* Unlock protected registers */
    SYS_UnlockReg();

    /* Init system, peripheral clock and multi-function I/O */
    SYS_Init();
    /* Lock protected registers */
    SYS_LockReg();

    /* Init Debug UART */
    UartDebugInit();

    printf("\n");
    printf("+----------------------------------------------+\n");
    printf("|    SPII2S + PDMA  Play and Record Sample Code|\n");
    printf("+----------------------------------------------+\n");
    printf("  I2S configuration:\n");
    printf("      Sample rate 16 kHz\n");
    printf("      Word width 16 bits\n");
    printf("      Stereo mode\n");
    printf("      I2S format\n");
    printf("      TX 1/2 value: 0x50005000/0xA000A000, 0x50015001/0xA001A001, ... \n");
    printf("  The I/O connection for I2S:\n");
    printf("      I2S_LRCLK (PB15)\n      I2S_BCLK(PB14)\n");
    printf("      I2S_DI (PA1)\n      I2S_DO (PA0)\n\n");
    printf("      This sample code will transmit then receive data with PDMA transfer.\n");
    printf("      Connect I2S_DI and I2S_DO to check if the transmitted data is the same\nwith the received data.\n");
    printf("      After PDMA transfer is finished, the transmitted and received values\nin each buffer will be printed.\n");

    /* Select PCLK as the clock source of SPI0 */
    CLK_SetModuleClock(SPI0_MODULE, CLK_CLKSEL2_SPI0SEL_PCLK1, MODULE_NoMsk);

    /* Enable I2S TX and RX functions */
    /* Sampling rate 16000 Hz; bit clock rate 512 kHz. */
    /* Master mode, 16-bit word width, stereo mode, I2S format. */
    SPII2S_Open(SPI0, SPII2S_MODE_MASTER, 16000, SPII2S_DATABIT_16, SPII2S_STEREO, SPII2S_FORMAT_I2S);

    /* Data initiation */
    u32InitValue = 0x50005000;

    for (u32DataCount = 0; u32DataCount < BUFF_LEN; u32DataCount++)
    {
        g_au32PcmTxBuff[0][u32DataCount] = u32InitValue;
        g_au32PcmTxBuff[1][u32DataCount] = u32InitValue + 0x50005000;
        u32InitValue += 0x00010001;
    }

    /* Enable PDMA channels */
    PDMA_Open(PDMA, (1 << I2S_TX_DMA_CH) | (1 << I2S_RX_DMA_CH));

    /* Tx(Play) description */
    g_asDescTable_TX[0].CTL = ((BUFF_LEN - 1) << PDMA_DSCT_CTL_TXCNT_Pos) | PDMA_WIDTH_32 | PDMA_SAR_INC | PDMA_DAR_FIX | PDMA_REQ_SINGLE | PDMA_OP_SCATTER;
    g_asDescTable_TX[0].SA = (uint32_t)&g_au32PcmTxBuff[0];
    g_asDescTable_TX[0].DA = (uint32_t)&SPI0->TX;
    g_asDescTable_TX[0].NEXT = (uint32_t)&g_asDescTable_TX[1] - (PDMA->SCATBA);

    g_asDescTable_TX[1].CTL = ((BUFF_LEN - 1) << PDMA_DSCT_CTL_TXCNT_Pos) | PDMA_WIDTH_32 | PDMA_SAR_INC | PDMA_DAR_FIX | PDMA_REQ_SINGLE | PDMA_OP_SCATTER;
    g_asDescTable_TX[1].SA = (uint32_t)&g_au32PcmTxBuff[1];
    g_asDescTable_TX[1].DA = (uint32_t)&SPI0->TX;
    g_asDescTable_TX[1].NEXT = (uint32_t)&g_asDescTable_TX[0] - (PDMA->SCATBA);   //link to first description

    /* Rx(Record) description */
    g_asDescTable_RX[0].CTL = ((BUFF_LEN - 1) << PDMA_DSCT_CTL_TXCNT_Pos) | PDMA_WIDTH_32 | PDMA_SAR_FIX | PDMA_DAR_INC | PDMA_REQ_SINGLE | PDMA_OP_SCATTER;
    g_asDescTable_RX[0].SA = (uint32_t)&SPI0->RX;
    g_asDescTable_RX[0].DA = (uint32_t)&g_au32PcmRxBuff[0];
    g_asDescTable_RX[0].NEXT = (uint32_t)&g_asDescTable_RX[1] - (PDMA->SCATBA);

    g_asDescTable_RX[1].CTL = ((BUFF_LEN - 1) << PDMA_DSCT_CTL_TXCNT_Pos) | PDMA_WIDTH_32 | PDMA_SAR_FIX | PDMA_DAR_INC | PDMA_REQ_SINGLE | PDMA_OP_SCATTER;
    g_asDescTable_RX[1].SA = (uint32_t)&SPI0->RX;
    g_asDescTable_RX[1].DA = (uint32_t)&g_au32PcmRxBuff[1];
    g_asDescTable_RX[1].NEXT = (uint32_t)&g_asDescTable_RX[0] - (PDMA->SCATBA);   //link to first description

    PDMA_SetTransferMode(PDMA, 1, PDMA_SPI0_TX, 1, (uint32_t)&g_asDescTable_TX[0]);
    PDMA_SetTransferMode(PDMA, 2, PDMA_SPI0_RX, 1, (uint32_t)&g_asDescTable_RX[0]);

    /* Enable PDMA channel 1&2 interrupt */
    PDMA_EnableInt(PDMA, 1, PDMA_INT_TRANS_DONE);
    PDMA_EnableInt(PDMA, 2, PDMA_INT_TRANS_DONE);

    NVIC_EnableIRQ(PDMA_IRQn);

    /* Clear RX FIFO */
    SPII2S_CLR_RX_FIFO(SPI0);

    /* Enable TX function and TX PDMA function */
    SPII2S_ENABLE_TX(SPI0);
    SPII2S_ENABLE_TXDMA(SPI0);

    // Enable RX function and RX PDMA function for receiving data
    SPII2S_ENABLE_RX(SPI0);

    // Reset timeout count for checking RX FIFO level
    i32TimeoutCount = SystemCoreClock;

    // Wait until the RX FIFO level is greater than 0 or timeout occurs
    while ((SPII2S_GET_RX_FIFO_LEVEL(SPI0) == 0) && (--i32TimeoutCount >= 0)) {}

    // Clear the RX FIFO to ensure no stale data remains
    SPII2S_CLR_RX_FIFO(SPI0);

    // Enable RX DMA function for receiving data via DMA
    SPII2S_ENABLE_RXDMA(SPI0);

    while (((u32PlayReady <= 2) || (u32RecReady <= 2)) && (--i32TimeoutCount >= 0)) {}

    SPII2S_DISABLE_TXDMA(SPI0);
    SPII2S_DISABLE_RXDMA(SPI0);

    NVIC_DisableIRQ(PDMA_IRQn);

    /* Print the transmitted data */
    printf("\nTX Buffer 1\tTX Buffer 2\n");

    for (u32DataCount = 0; u32DataCount < BUFF_LEN; u32DataCount++)
    {
        printf("0x%X\t0x%X\n", g_au32PcmTxBuff[0][u32DataCount], g_au32PcmTxBuff[1][u32DataCount]);
    }

    u32PlayReady = 0;

    /* Print the received data */
    printf("\nRX Buffer 1\tRX Buffer 2\n");

    for (u32DataCount = 0; u32DataCount < BUFF_LEN; u32DataCount++)
    {
        printf("0x%X\t0x%X\n", g_au32PcmRxBuff[0][u32DataCount], g_au32PcmRxBuff[1][u32DataCount]);
    }

    u32RecReady = 0;

    printf("\n\nExit I2S sample code.\n");

    while (1);
}

void SYS_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/

    /* Enable HIRC clock */
    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);

    /* Waiting for HIRC clock ready */
    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);

    /* Select HCLK clock source as HIRC and and HCLK clock divider as 1 */
    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));

    /* Select PCLK0 as the clock source of SPI2 */
    CLK_SetModuleClock(SPI0_MODULE, CLK_CLKSEL2_SPI0SEL_PCLK1, MODULE_NoMsk);

    /* Enable peripheral clock */
    CLK_EnableModuleClock(SPI0_MODULE);
    CLK_EnableModuleClock(PDMA_MODULE);

    /* Debug UART clock setting */
    UartDebugCLK();

    /* Update System Core Clock */
    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CyclesPerUs automatically. */
    SystemCoreClockUpdate();

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set UART Default MPF */
    UartDebugMFP();

    /* Setup SPI0 multi-function pins */
    SYS->GPA_MFPL = (SYS->GPA_MFPL & ~(SYS_GPA_MFPL_PA0MFP_Msk | SYS_GPA_MFPL_PA1MFP_Msk)) | SYS_GPA_MFPL_PA0MFP_SPI0_MOSI | SYS_GPA_MFPL_PA1MFP_SPI0_MISO;
    SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB14MFP_Msk | SYS_GPB_MFPH_PB15MFP_Msk)) | SYS_GPB_MFPH_PB14MFP_SPI0_CLK | SYS_GPB_MFPH_PB15MFP_SPI0_SS;

    /* Enable SPI0 clock pin (PB14) schmitt trigger */
    PB->SMTEN |= GPIO_SMTEN_SMTEN14_Msk;
}

void PDMA_IRQHandler(void)
{
    uint32_t u32Status = PDMA_GET_INT_STATUS(PDMA);

    if (u32Status & 0x1)   /* abort */
    {
        if (PDMA_GET_ABORT_STS(PDMA) & 0x4)
            PDMA_CLR_ABORT_FLAG(PDMA, PDMA_ABTSTS_ABTIF1_Msk);

        PDMA_CLR_ABORT_FLAG(PDMA, PDMA_ABTSTS_ABTIF2_Msk);
    }
    else if (u32Status & 0x2)
    {
        if (PDMA_GET_TD_STS(PDMA) & 0x2)            /* channel 1 done */
        {
            /* Reset PDMA Scatter-Gather table */
            PDMA_ResetTxSGTable(u8TxIdx);
            u8TxIdx ^= 1;
            u32PlayReady ++;
        }

        PDMA_CLR_TD_FLAG(PDMA, PDMA_TDSTS_TDIF1_Msk);

        if (PDMA_GET_TD_STS(PDMA) & 0x4)            /* channel 2 done */
        {
            /* Reset PDMA Scatter-Gather table */
            PDMA_ResetRxSGTable(u8RxIdx);
            u8RxIdx ^= 1;
            u32RecReady ++;
        }

        PDMA_CLR_TD_FLAG(PDMA, PDMA_TDSTS_TDIF2_Msk);
    }
    else
    {
        printf("unknown interrupt, status=0x%x!!\n", u32Status);
    }
}
