Diff: SPI/Master/spi_master.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SPI/Master/spi_master.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,299 @@
+/***********************************************************************//**
+ * @file		spi_master.c
+ * @purpose		This example describes how to use SPI in master mode
+ * @version		2.0
+ * @date		21. May. 2010
+ * @author		NXP MCU SW Application Team
+ *---------------------------------------------------------------------
+ * Software that is described herein is for illustrative purposes only
+ * which provides customers with programming information regarding the
+ * products. This software is supplied "AS IS" without any warranties.
+ * NXP Semiconductors assumes no responsibility or liability for the
+ * use of the software, conveys no license or title under any patent,
+ * copyright, or mask work right to the product. NXP Semiconductors
+ * reserves the right to make changes in the software without
+ * notification. NXP Semiconductors also make no representation or
+ * warranty that such application will be suitable for the specified
+ * use without further testing or modification.
+ **********************************************************************/
+#include "lpc17xx_spi.h"
+#include "lpc17xx_libcfg.h"
+#include "lpc17xx_pinsel.h"
+#include "debug_frmwrk.h"
+#include "lpc17xx_gpio.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup SPI_Master	Master
+ * @ingroup SPI_Examples
+ * @{
+ */
+
+/************************** PRIVATE DEFINITIONS *********************/
+// PORT number that /CS pin assigned on
+#define CS_PORT_NUM		0
+// PIN number that  /CS pin assigned on
+#define CS_PIN_NUM		16
+#define SPI_DATABIT_SIZE 		10
+
+/** Max buffer length */
+#define BUFFER_SIZE			0x40
+
+/************************** PRIVATE VARIABLES *************************/
+uint8_t menu1[] =
+"********************************************************************************\n\r"
+"Hello NXP Semiconductors \n\r"
+"SPI demo \n\r"
+"\t - MCU: LPC17xx \n\r"
+"\t - Core: ARM Cortex-M3 \n\r"
+"\t - Communicate via: UART0 - 115200bps \n\r"
+"\t An example of SPI using interrupt mode to test the SPI driver \n\r"
+" This example uses SPI in master mode to communicate with SPI slave device \n\r"
+" The master and slave transfer together a number of data byte \n\r"
+"********************************************************************************\n\r";
+uint8_t menu2[] = "Demo terminated! \n\r";
+
+// SPI Configuration structure variable
+SPI_CFG_Type SPI_ConfigStruct;
+
+#if (SPI_DATABIT_SIZE == 8)
+uint8_t Tx_Buf[BUFFER_SIZE];
+uint8_t Rx_Buf[BUFFER_SIZE];
+#else
+uint16_t Tx_Buf[BUFFER_SIZE];
+uint16_t Rx_Buf[BUFFER_SIZE];
+#endif
+
+/************************** PRIVATE FUNCTIONS *************************/
+void CS_Init(void);
+void CS_Force(int32_t state);
+void print_menu(void);
+void Buffer_Init(void);
+void Error_Loop(void);
+void Buffer_Verify(void);
+
+/*-------------------------PRIVATE FUNCTIONS------------------------------*/
+/*********************************************************************//**
+ * @brief 		Initialize CS pin as GPIO function to drive /CS pin
+ * 				due to definition of CS_PORT_NUM and CS_PORT_NUM
+ * @param		None
+ * @return		None
+ ***********************************************************************/
+void CS_Init(void)
+{
+	GPIO_SetDir(CS_PORT_NUM, (1<<CS_PIN_NUM), 1);
+	GPIO_SetValue(CS_PORT_NUM, (1<<CS_PIN_NUM));
+}
+
+
+/*********************************************************************//**
+ * @brief 		Drive CS output pin to low/high level to select slave device
+ * 				via /CS pin state
+ * @param[in]	state State of CS output pin that will be driven:
+ * 				- 0: Drive CS pin to low level
+ * 				- 1: Drive CS pin to high level
+ * @return		None
+ ***********************************************************************/
+void CS_Force(int32_t state)
+{
+	if (state){
+		GPIO_SetValue(CS_PORT_NUM, (1<<CS_PIN_NUM));
+	}else{
+		GPIO_ClearValue(CS_PORT_NUM, (1<<CS_PIN_NUM));
+	}
+}
+
+/*********************************************************************//**
+ * @brief		Initialize buffer
+ * @param[in]	None
+ * @return 		None
+ **********************************************************************/
+void Buffer_Init(void)
+{
+	uint8_t i;
+#if (SPI_DATABIT_SIZE == 8)
+	for (i = 0; i < BUFFER_SIZE; i++) {
+		Tx_Buf[i] = i;
+		Rx_Buf[i] = 0;
+	}
+#else
+	for (i = 0; i < BUFFER_SIZE/2; i++) {
+		Tx_Buf[i] = i;
+		Rx_Buf[i] = 0;
+	}
+#endif
+}
+
+/*********************************************************************//**
+ * @brief		Error Loop (called by Buffer_Verify() if any error)
+ * @param[in]	none
+ * @return 		None
+ **********************************************************************/
+void Error_Loop(void)
+{
+	/* Loop forever */
+	while (1);
+}
+
+/*********************************************************************//**
+ * @brief		Verify buffer
+ * @param[in]	none
+ * @return 		None
+ **********************************************************************/
+void Buffer_Verify(void)
+{
+	uint8_t i;
+#if (DATA_SIZE==8)
+	uint8_t *src_addr = (uint8_t *) &Tx_Buf[0];
+	uint8_t *dest_addr = (uint8_t *) &Rx_Buf[0];
+	for ( i = 0; i < SPI_DATABIT_SIZE; i++ )
+	{
+		if ( *src_addr++ != *dest_addr++ )
+		{
+			/* Call Error Loop */
+			_DBG_("Verify error");
+			Error_Loop();
+		}
+	}
+#else
+	uint16_t *src_addr = (uint16_t *) &Tx_Buf[0];
+	uint16_t *dest_addr = (uint16_t *) &Rx_Buf[0];
+	for ( i = 0; i < SPI_DATABIT_SIZE/2; i++ )
+	{
+		if ( *src_addr++ != *dest_addr++ )
+		{
+			/* Call Error Loop */
+			_DBG_("Verify error");
+			Error_Loop();
+		}
+	}
+#endif
+}
+
+/*********************************************************************//**
+ * @brief		Print Welcome menu
+ * @param[in]	none
+ * @return 		None
+ **********************************************************************/
+void print_menu(void)
+{
+	_DBG(menu1);
+}
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main SPI program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry(void)
+{
+	PINSEL_CFG_Type PinCfg;
+	SPI_DATA_SETUP_Type xferConfig;
+	uint32_t tmp;
+
+	/*
+	 * Initialize SPI pin connect
+	 * P0.15 - SCK;
+	 * P0.16 - SSEL - used as GPIO
+	 * P0.17 - MISO
+	 * P0.18 - MOSI
+	 */
+	PinCfg.Funcnum = 3;
+	PinCfg.OpenDrain = 0;
+	PinCfg.Pinmode = 0;
+	PinCfg.Portnum = 0;
+	PinCfg.Pinnum = 15;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 17;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 18;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 16;
+	PinCfg.Funcnum = 0;
+	PINSEL_ConfigPin(&PinCfg);
+
+	/* Initialize debug via UART0
+	 * – 115200bps
+	 * – 8 data bit
+	 * – No parity
+	 * – 1 stop bit
+	 * – No flow control
+	 */
+	debug_frmwrk_init();
+
+	// print welcome screen
+	print_menu();
+
+	SPI_ConfigStruct.CPHA = SPI_CPHA_SECOND;
+	SPI_ConfigStruct.CPOL = SPI_CPOL_LO;
+	SPI_ConfigStruct.ClockRate = 2000000;
+	SPI_ConfigStruct.DataOrder = SPI_DATA_MSB_FIRST;
+	SPI_ConfigStruct.Databit = SPI_DATABIT_SIZE;
+	SPI_ConfigStruct.Mode = SPI_MASTER_MODE;
+	// Initialize SPI peripheral with parameter given in structure above
+	SPI_Init(LPC_SPI, &SPI_ConfigStruct);
+
+	_DBG_("Press '1' to start transfer...");
+
+	while (_DG != '1');
+
+	_DBG_("Init buffer");
+	/* Initialize Buffer */
+	Buffer_Init();
+
+	CS_Init();
+
+	_DBG_("Start transfer...");
+	CS_Force(0);
+	// delay for a while
+	for (tmp = 10000; tmp; tmp--);
+	xferConfig.tx_data = Tx_Buf;
+	xferConfig.rx_data = Rx_Buf;
+	xferConfig.length = BUFFER_SIZE;
+	SPI_ReadWrite(LPC_SPI, &xferConfig, SPI_TRANSFER_POLLING);
+	// delay for a while
+	for (tmp = 10000; tmp; tmp--);
+	CS_Force(1);
+	_DBG_("Complete!");
+
+	// Verify buffer after transferring
+	Buffer_Verify();
+	_DBG_("Verify complete!");
+	SPI_DeInit(LPC_SPI);
+    /* Loop forever */
+    while(1);
+    return 1;
+}
+
+/* With ARM and GHS toolsets, the entry point is main() - this will
+   allow the linker to generate wrapper code to setup stacks, allocate
+   heap area, and initialize and copy code and data segments. For GNU
+   toolsets, the entry point is through __start() in the crt0_gnu.asm
+   file, and that startup code will setup stacks and data */
+int main(void)
+{
+    return c_entry();
+}
+
+
+#ifdef  DEBUG
+/*******************************************************************************
+* @brief		Reports the name of the source file and the source line number
+* 				where the CHECK_PARAM error has occurred.
+* @param[in]	file Pointer to the source file name
+* @param[in]    line assert_param error line source number
+* @return		None
+*******************************************************************************/
+void check_failed(uint8_t *file, uint32_t line)
+{
+	/* User can add his own implementation to report the file name and line number,
+	 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
+
+	/* Infinite loop */
+	while(1);
+}
+#endif
+
+/*
+ * @}
+ */