/******************************************************************************
 * @file     main.c
 * @version  V1.00
 * $Revision: 2 $
 * $Date: 16/10/25 4:28p $
 * @brief
 *           Implement USCI_SPI1 Master loop back transfer.
 *           This sample code needs to connect USCI_SPI1_MISO pin and USCI_SPI1_MOSI pin together.
 *           It will compare the received data with transmitted data.
 * @note
 * @copyright SPDX-License-Identifier: Apache-2.0
 * @copyright Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "NUC029xGE.h"


#define TEST_COUNT             64

uint32_t g_au32SourceData[TEST_COUNT];
uint32_t g_au32DestinationData[TEST_COUNT];

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

/* ------------- */
/* Main function */
/* ------------- */
int main()
{
    uint32_t u32DataCount, u32TestCount, u32Err, u32TimeOutCnt;

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

    /* Init UART for print message */
    UART_Init();

    /* Init USCI_SPI1 */
    USCI_SPI_Init();

    printf("\n\n");
    printf("+------------------------------------------------------------------+\n");
    printf("|                   USCI_SPI Driver Sample Code                    |\n");
    printf("+------------------------------------------------------------------+\n");
    printf("\n");
    printf("\nThis sample code demonstrates USCI_SPI1 self loop back data transfer.\n");
    printf(" USCI_SPI1 configuration:\n");
    printf("     Master mode; data width 16 bits.\n");
    printf(" I/O connection:\n");
    printf("     PD.14 USCI_SPI1_MOSI <--> PD.13 USCI_SPI1_MISO \n");

    printf("\nUSCI_SPI1 Loopback test ");

    /* set the source data and clear the destination buffer */
    for(u32DataCount = 0; u32DataCount < TEST_COUNT; u32DataCount++)
    {
        g_au32SourceData[u32DataCount] = u32DataCount;
        g_au32DestinationData[u32DataCount] = 0;
    }

    u32Err = 0;
    for(u32TestCount = 0; u32TestCount < 0x1000; u32TestCount++)
    {
        /* set the source data and clear the destination buffer */
        for(u32DataCount = 0; u32DataCount < TEST_COUNT; u32DataCount++)
        {
            g_au32SourceData[u32DataCount]++;
            g_au32DestinationData[u32DataCount] = 0;
        }

        u32DataCount = 0;

        if((u32TestCount & 0x1FF) == 0)
        {
            putchar('.');
        }

        while(1)
        {
            /* Write to TX register */
            USPI1->TXDAT = g_au32SourceData[u32DataCount];
            /* Check SPI1 busy status */
            u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
            while(USPI1->PROTSTS & USPI_PROTSTS_BUSY_Msk)
            {
                if(--u32TimeOutCnt == 0)
                {
                    printf("Wait for USCI_SPI time-out!\n");
                    u32Err = 1;
                    break;
                }
            }

            if(u32Err)
                break;

            /* Read received data */
            g_au32DestinationData[u32DataCount] = USPI1->RXDAT;
            u32DataCount++;
            if(u32DataCount == TEST_COUNT)
                break;
        }

        if(u32Err)
            break;

        /*  Check the received data */
        for(u32DataCount = 0; u32DataCount < TEST_COUNT; u32DataCount++)
        {
            if(g_au32DestinationData[u32DataCount] != g_au32SourceData[u32DataCount])
                u32Err = 1;
        }

        if(u32Err)
            break;
    }

    if(u32Err)
        printf(" [FAIL]\n\n");
    else
        printf(" [PASS]\n\n");

    /* Disable USCI_SPI1 function mode */
    USPI1->CTL &= ~USPI_CTL_FUNMODE_Msk;

    while(1);
}

void SYS_Init(void)
{
	uint32_t u32TimeOutCnt;


    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/

    /* Enable external 12MHz XTAL */
    CLK->PWRCTL |= CLK_PWRCTL_HXTEN_Msk;

    /* Waiting for clock ready */
    u32TimeOutCnt = __HIRC;
    while(!(CLK->STATUS & CLK_STATUS_HXTSTB_Msk))
		if(--u32TimeOutCnt == 0) break;


    /* Select HXT as the clock source of HCLK */
    CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLKSEL_Msk)) | CLK_CLKSEL0_HCLKSEL_HXT;

    /* Select HXT as the clock source of UART */
    CLK->CLKSEL1 = (CLK->CLKSEL1 & (~CLK_CLKSEL1_UARTSEL_Msk)) | CLK_CLKSEL1_UARTSEL_HXT;

    /* Enable 48MHz HIRC */
    CLK->PWRCTL |= CLK_PWRCTL_HIRC48EN_Msk;

    /* Waiting for 48MHz clock ready */
    u32TimeOutCnt = __HIRC;
    while(!(CLK->STATUS & CLK_STATUS_HIRC48STB_Msk))
		if(--u32TimeOutCnt == 0) break;

    /* HCLK Clock source from HIRC48 */
    CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLKSEL_Msk)) | CLK_CLKSEL0_HCLKSEL_HIRC48;

    /* Enable UART clock */
    CLK->APBCLK0 = CLK_APBCLK0_UART0CKEN_Msk;

    /* Enable USCI1 clock */
    CLK->APBCLK1 = CLK_APBCLK1_USCI1CKEN_Msk;

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

    /* Set PA multi-function pins for UART0 RXD and TXD */
    SYS->GPA_MFPL &= ~(SYS_GPA_MFPL_PA3MFP_Msk | SYS_GPA_MFPL_PA2MFP_Msk);
    SYS->GPA_MFPL |= (SYS_GPA_MFPL_PA3MFP_UART0_RXD | SYS_GPA_MFPL_PA2MFP_UART0_TXD);

    /* Set PD5 as output mode and PD6 as Input mode */
    PD->MODE = (PD->MODE & 0xFFFFC3FF) | 0x00000400;

    /* Set USCI_SPI1 multi-function pins */
    SYS->GPD_MFPH &= ~(SYS_GPD_MFPH_PD12MFP_Msk | SYS_GPD_MFPH_PD13MFP_Msk | SYS_GPD_MFPH_PD14MFP_Msk | SYS_GPD_MFPH_PD15MFP_Msk);
    SYS->GPD_MFPH |= (SYS_GPD_MFPH_PD12MFP_USCI1_CTL0 | SYS_GPD_MFPH_PD13MFP_USCI1_DAT1 | SYS_GPD_MFPH_PD14MFP_USCI1_DAT0 | SYS_GPD_MFPH_PD15MFP_USCI1_CLK);

    /* Set PC0,2,3 as output mode and PC1 as Input mode */
    PC->MODE = (PC->MODE & 0xFFFFFF00) | 0x00000051;
}

void UART_Init(void)
{
    /* Word length is 8 bits; 1 stop bit; no parity bit. */
    UART0->LINE = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
    /* UART peripheral clock rate 12MHz; UART bit rate 115200 bps. */
    UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HXT, 115200);
}

void USCI_SPI_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init USCI_SPI1                                                                                          */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Select USCI_SPI1 protocol */
    USPI1->CTL &= ~USPI_CTL_FUNMODE_Msk;
    USPI1->CTL = 1 << USPI_CTL_FUNMODE_Pos;
    /* Configure USCI_SPI1 as a master, clock idle low, 16-bit transaction, drive output on falling clock edge and latch input on rising edge. */
    USPI1->PROTCTL = USPI_MASTER | USPI_MODE_0;
    USPI1->LINECTL = 0;
    /* Set USCI_SPI1 clock rate = f_PCLK1 / 2*(5+1) */
    USPI1->BRGEN = (USPI1->BRGEN & (~USPI_BRGEN_CLKDIV_Msk)) | (5 << USPI_BRGEN_CLKDIV_Pos);
    /* Enable USCI_SPI1 protocol */
    USPI1->PROTCTL |= USPI_PROTCTL_PROTEN_Msk;
}


/*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
