/**************************************************************************//**
 * @file     main.c
 * @version  V3.0
 * $Revision: 3 $
 * $Date: 15/04/16 10:56a $
 * @brief
 *           Configure SPI0 as Master mode and demonstrate how to communicate with an off-chip SPI Slave device with FIFO mode. 
 *           This sample code needs to work with SPI_SlaveFifoMode sample code.
 * @note
 * @copyright SPDX-License-Identifier: Apache-2.0
 *
 * @copyright Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include "NUC200Series.h"

#define PLL_CLOCK           50000000

#define TEST_COUNT 16

uint32_t g_au32SourceData[TEST_COUNT];
uint32_t g_au32DestinationData[TEST_COUNT];
volatile uint32_t g_u32TxDataCount;
volatile uint32_t g_u32RxDataCount;

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

/* ------------- */
/* Main function */
/* ------------- */
int main(void)
{
    uint32_t u32DataCount;

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

    /* Configure UART0: 115200, 8-bit word, no parity bit, 1 stop bit. */
    UART_Open(UART0, 115200);

    /* Init SPI */
    SPI_Init();

    printf("\n\n");
    printf("+-----------------------------------------------------+\n");
    printf("|             SPI Master Mode Sample Code             |\n");
    printf("+-----------------------------------------------------+\n");
    printf("\n");
    printf("Configure SPI0 as a master.\n");
    printf("Bit length of a transaction: 32\n");
    printf("The I/O connection for SPI0:\n");
    printf("    SPI0_SS0 (PC.0)\n    SPI0_CLK (PC.1)\n");
    printf("    SPI0_MISO0 (PC.2)\n    SPI0_MOSI0 (PC.3)\n\n");
    printf("SPI controller will enable FIFO mode and transfer %d data to a off-chip slave device.\n", TEST_COUNT);
    printf("In the meanwhile the SPI controller will receive %d data from the off-chip slave device.\n", TEST_COUNT);
    printf("After the transfer is done, the %d received data will be printed out.\n", TEST_COUNT);
    printf("The SPI master configuration is ready.\n");

    for(u32DataCount = 0; u32DataCount < TEST_COUNT; u32DataCount++)
    {
        /* Write the initial value to source buffer */
        g_au32SourceData[u32DataCount] = 0x00550000 + u32DataCount;
        /* Clear destination buffer */
        g_au32DestinationData[u32DataCount] = 0;
    }

    printf("Before starting the data transfer, make sure the slave device is ready. Press any key to start the transfer.\n");
    getchar();
    printf("\n");

    /* Set TX FIFO threshold, enable TX FIFO threshold interrupt and RX FIFO time-out interrupt */
    SPI_EnableFIFO(SPI0, 4, 4);
    SPI_EnableInt(SPI0, SPI_FIFO_TX_INT_MASK | SPI_FIFO_TIMEOUT_INT_MASK);
    
    g_u32TxDataCount = 0;
    g_u32RxDataCount = 0;
    NVIC_EnableIRQ(SPI0_IRQn);

    /* Wait for transfer done */
    while(g_u32RxDataCount < TEST_COUNT);

    /* Print the received data */
    printf("Received data:\n");
    for(u32DataCount = 0; u32DataCount < TEST_COUNT; u32DataCount++)
    {
        printf("%d:\t0x%X\n", u32DataCount, g_au32DestinationData[u32DataCount]);
    }
    /* Disable TX FIFO threshold interrupt and RX FIFO time-out interrupt */
    SPI_DisableInt(SPI0, SPI_FIFO_TX_INT_MASK | SPI_FIFO_TIMEOUT_INT_MASK);
    NVIC_DisableIRQ(SPI0_IRQn);
    printf("The data transfer was done.\n");

    printf("\n\nExit SPI driver sample code.\n");

    /* Reset SPI0 */
    SPI_Close(SPI0);
    while(1);
}

void SYS_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Enable Internal RC 22.1184 MHz clock */
    CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);

    /* Waiting for Internal RC clock ready */
    CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
    
    /* Enable external 12 MHz XTAL */
    CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);

    /* Waiting for clock ready */
    CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);

    /* Set core clock rate as PLL_CLOCK from PLL */
    CLK_SetCoreClock(PLL_CLOCK);

    /* Select HXT as the clock source of UART0 */
    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));

    /* Select HCLK as the clock source of SPI0 */
    CLK_SetModuleClock(SPI0_MODULE, CLK_CLKSEL1_SPI0_S_HCLK, MODULE_NoMsk);

    /* Enable UART peripheral clock */
    CLK_EnableModuleClock(UART0_MODULE);
    /* Enable SPI0 peripheral clock */
    CLK_EnableModuleClock(SPI0_MODULE);

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

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set PB multi-function pins for UART0 RXD and TXD */
    SYS->GPB_MFP &= ~(SYS_GPB_MFP_PB0_Msk | SYS_GPB_MFP_PB1_Msk);
    SYS->GPB_MFP |= (SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD);

    /* Setup SPI0 multi-function pins */
    SYS->GPC_MFP &= ~(SYS_GPC_MFP_PC0_Msk | SYS_GPC_MFP_PC1_Msk | SYS_GPC_MFP_PC2_Msk | SYS_GPC_MFP_PC3_Msk);
    SYS->GPC_MFP |= (SYS_GPC_MFP_PC0_SPI0_SS0 | SYS_GPC_MFP_PC1_SPI0_CLK | SYS_GPC_MFP_PC2_SPI0_MISO0 | SYS_GPC_MFP_PC3_SPI0_MOSI0);
    SYS->ALT_MFP &= ~(SYS_ALT_MFP_PC0_Msk | SYS_ALT_MFP_PC1_Msk | SYS_ALT_MFP_PC2_Msk | SYS_ALT_MFP_PC3_Msk);
    SYS->ALT_MFP |= (SYS_ALT_MFP_PC0_SPI0_SS0 | SYS_ALT_MFP_PC1_SPI0_CLK | SYS_ALT_MFP_PC2_SPI0_MISO0 | SYS_ALT_MFP_PC3_SPI0_MOSI0);
}

void SPI_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init SPI                                                                                                */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Configure as a master, clock idle low, 32-bit transaction, drive output on falling clock edge and latch input on rising edge. */
    /* Set IP clock divider. SPI clock rate = 1 MHz */
    SPI_Open(SPI0, SPI_MASTER, SPI_MODE_0, 32, 1000000);

    /* Enable the automatic hardware slave select function. Select the SS pin and configure as low-active. */
    SPI_EnableAutoSS(SPI0, SPI_SS0, SPI_SS_ACTIVE_LOW);
}

void SPI0_IRQHandler(void)
{
    /* Check RX EMPTY flag */
    while(SPI_GET_RX_FIFO_EMPTY_FLAG(SPI0) == 0)
    {
        /* Read RX FIFO */
        g_au32DestinationData[g_u32RxDataCount++] = SPI_READ_RX0(SPI0);
    }
    /* Check TX FULL flag and TX data count */
    while((SPI_GET_TX_FIFO_FULL_FLAG(SPI0) == 0) && (g_u32TxDataCount < TEST_COUNT))
    {
        /* Write to TX FIFO */
        SPI_WRITE_TX0(SPI0, g_au32SourceData[g_u32TxDataCount++]);
    }
    if(g_u32TxDataCount >= TEST_COUNT)
         SPI_DisableInt(SPI0, SPI_FIFO_TX_INT_MASK); /* Disable TX FIFO threshold interrupt */

    /* Check the RX FIFO time-out interrupt flag */
    if(SPI_GetIntFlag(SPI0, SPI_FIFO_TIMEOUT_INT_MASK))
    {
        /* If RX FIFO is not empty, read RX FIFO. */
        while((SPI0->STATUS & SPI_STATUS_RX_EMPTY_Msk) == 0)
            g_au32DestinationData[g_u32RxDataCount++] = SPI_READ_RX0(SPI0);
    }
}


/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/

