- /******************************************************************************
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V1.00
- * $Revision: 2 $
- * $Date: 20/06/10 10:56a $
- * [url=home.php?mod=space&uid=247401]@brief[/url] Implement SPI Master loop back transfer. This sample code needs to
- * connect MISO_0 pin and MOSI_0 pin together. It will compare the
- * received data with transmitted data.
- *
- * @note
- * SPDX-License-Identifier: Apache-2.0
- * Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
- *
- *****************************************************************************/
- #include <stdio.h>
- #include "NuMicro.h"
- #define TEST_CYCLE 0x1000
- #define DATA_COUNT 64
- #define SPI_CLK_FREQ 2000000
- uint32_t g_au32SourceData[DATA_COUNT];
- uint32_t g_au32DestinationData[DATA_COUNT];
- /* Function prototype declaration */
- void SYS_Init(void);
- void SPI_Init(void);
- /* ------------- */
- /* Main function */
- /* ------------- */
- int main(void)
- {
- uint32_t u32DataCount, u32TestCycle, u32Err;
- uint32_t u32TimeOutCount;
- /* 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("| M030G SPI Driver Sample Code |\n");
- printf("+--------------------------------------------------------------------+\n");
- printf("\n");
- printf("\nThis sample code demonstrates SPI0 self loop back data transfer.\n");
- printf(" SPI0 configuration:\n");
- printf(" Master mode; data width 32 bits.\n");
- printf(" I/O connection:\n");
- printf(" SPI0_MOSI(PA.0) <--> SPI0_MISO(PA.1) \n");
- printf("\nSPI0 Loopback test ");
- u32Err = 0;
- for(u32TestCycle = 0; u32TestCycle < TEST_CYCLE; u32TestCycle++)
- {
- /* set the source data and clear the destination buffer */
- for(u32DataCount = 0; u32DataCount < DATA_COUNT; u32DataCount++)
- {
- g_au32SourceData[u32DataCount] = u32DataCount;
- g_au32DestinationData[u32DataCount] = 0;
- }
- u32DataCount = 0;
- if((u32TestCycle & 0x1FF) == 0)
- {
- putchar('.');
- }
- while(1)
- {
- /* setup timeout */
- u32TimeOutCount = SystemCoreClock;
- /* Write to TX register */
- SPI_WRITE_TX(SPI0, g_au32SourceData[u32DataCount]);
- /* Check SPI0 busy status */
- while(SPI_IS_BUSY(SPI0))
- {
- if(u32TimeOutCount == 0)
- {
- printf("\nSomething is wrong, please check if pin connection is correct. \n");
- while(1);
- }
- u32TimeOutCount--;
- }
- /* Read received data */
- g_au32DestinationData[u32DataCount] = SPI_READ_RX(SPI0);
- u32DataCount++;
- if(u32DataCount >= DATA_COUNT)
- break;
- }
- /* Check the received data */
- for(u32DataCount = 0; u32DataCount < DATA_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");
- /* Close SPI0 */
- SPI_Close(SPI0);
- 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);
- /* Switch HCLK clock source to HIRC and HCLK source divide 1 */
- CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
- /* Select HIRC as the clock source of UART0 */
- CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));
- /* Select PCLK1 as the clock source of SPI0 */
- CLK_SetModuleClock(SPI0_MODULE, CLK_CLKSEL2_SPI0SEL_PCLK1, MODULE_NoMsk);
- /* Enable UART peripheral clock */
- CLK_EnableModuleClock(UART0_MODULE);
- /* Enable SPI0 peripheral clock */
- CLK_EnableModuleClock(SPI0_MODULE);
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Set PB multi-function pins for UART0 RXD=PB.12 and TXD=PB.13 */
- SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk)) |
- (SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);
- /* Setup SPI0 multi-function pins */
- /* PA.3 is SPI0_SS, PA.2 is SPI0_CLK,
- PA.1 is SPI0_MISO, PA.0 is SPI0_MOSI*/
- SYS->GPA_MFPL = (SYS->GPA_MFPL & ~(SYS_GPA_MFPL_PA3MFP_Msk |
- SYS_GPA_MFPL_PA2MFP_Msk |
- SYS_GPA_MFPL_PA1MFP_Msk |
- SYS_GPA_MFPL_PA0MFP_Msk)) |
- (SYS_GPA_MFPL_PA3MFP_SPI0_SS |
- SYS_GPA_MFPL_PA2MFP_SPI0_CLK |
- SYS_GPA_MFPL_PA1MFP_SPI0_MISO |
- SYS_GPA_MFPL_PA0MFP_SPI0_MOSI);
- /* Update System Core Clock */
- /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and CyclesPerUs automatically. */
- SystemCoreClockUpdate();
- }
- 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 = 2MHz */
- SPI_Open(SPI0, SPI_MASTER, SPI_MODE_0, 32, SPI_CLK_FREQ);
- /* Enable the automatic hardware slave select function. Select the SS pin and configure as low-active. */
- SPI_EnableAutoSS(SPI0, SPI_SS, SPI_SS_ACTIVE_LOW);
- }
- /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
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