Diff: SSP/sc16is750_int/sc16is750_int.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SSP/sc16is750_int/sc16is750_int.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,416 @@
+/***********************************************************************//**
+ * @file		sc16is750_int.c
+ * @purpose		This example describes how to use SPP using interrupt mode,
+ * 			  	SSP frame format to communicate with SC16IS750/760 Demo board
+ * @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_ssp.h"
+#include "lpc17xx_libcfg.h"
+#include "lpc17xx_pinsel.h"
+#include "debug_frmwrk.h"
+#include "lpc17xx_gpio.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup SSP_sc16is750_int	sc16is750_int
+ * @ingroup SSP_Examples
+ * @{
+ */
+
+/************************** PRIVATE DEFINTIONS ***********************/
+// PORT number that /CS pin assigned on
+#define CS_PORT_NUM		0
+// PIN number that  /CS pin assigned on
+#define CS_PIN_NUM		16
+
+/* Idle char */
+#define IDLE_CHAR	0xFF
+
+// Define macro used in command when using SSP with SC16IS740
+#define SC16IS740_WR_CMD(x)		((uint8_t) (x << 3))
+#define SC16IS740_RD_CMD(x)		((uint8_t) ((x << 3) | 0x80))
+
+// Define register address of SC16IS740
+#define SC16IS740_IODIR_REG		0x0A
+#define SC16IS740_IOSTATE_REG	0x0B
+#define SC16IS740_IOCON_REG		0x0E
+
+/************************** PRIVATE VARIABLES *************************/
+uint8_t menu1[] =
+"********************************************************************************\n\r"
+"Hello NXP Semiconductors \n\r"
+"SSP demo \n\r"
+"\t - MCU: LPC17xx \n\r"
+"\t - Core: ARM Cortex-M3 \n\r"
+"\t - Communicate via: UART0 - 9.6 kbps \n\r"
+" An example of SSP using interrupt mode - SPI frame format \n\r"
+"to test SSP driver \n\r"
+" Using SSP at mode SSP master/8bit on LPC1768 to communicate with \n\r"
+" SC16IS750/760 Demo Board \n\r"
+" Press '1' to turn on LEDs, '2' to turn off LEDs \n\r"
+"********************************************************************************\n\r";
+uint8_t menu2[] = "Demo terminated! \n\r";
+
+uint8_t iocon_cfg[2] = {SC16IS740_WR_CMD(SC16IS740_IOCON_REG), 0x00};
+uint8_t iodir_cfg[2] = {SC16IS740_WR_CMD(SC16IS740_IODIR_REG), 0xFF};
+uint8_t iostate_on[2] = {SC16IS740_WR_CMD(SC16IS740_IOSTATE_REG), 0x00};
+uint8_t iostate_off[2] = {SC16IS740_WR_CMD(SC16IS740_IOSTATE_REG), 0xFF};
+uint8_t sspreadbuf[2];
+
+/* Status Flag indicates current SSP transmission complete or not */
+__IO FlagStatus complete;
+
+// SSP Configuration structure variable
+SSP_CFG_Type SSP_ConfigStruct;
+SSP_DATA_SETUP_Type xferConfig;
+
+/************************** PRIVATE FUNCTIONS *************************/
+void SSP0_IRQHandler(void);
+
+void CS_Init(void);
+void CS_Force(int32_t state);
+void print_menu(void);
+
+
+/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
+/*********************************************************************//**
+ * @brief 		SSP0 Interrupt used for reading and writing handler
+ * @param		None
+ * @return 		None
+ ***********************************************************************/
+void SSP0_IRQHandler(void)
+{
+	SSP_DATA_SETUP_Type *xf_setup;
+	uint16_t tmp;
+	uint8_t dataword;
+
+	// Disable all SSP interrupts
+	SSP_IntConfig(LPC_SSP0, SSP_INTCFG_ROR|SSP_INTCFG_RT|SSP_INTCFG_RX|SSP_INTCFG_TX, DISABLE);
+
+	if(SSP_GetDataSize(LPC_SSP0)>8)
+		dataword = 1;
+	else
+		dataword = 0;
+	xf_setup = &xferConfig;
+	// save status
+	tmp = SSP_GetRawIntStatusReg(LPC_SSP0);
+	xf_setup->status = tmp;
+
+	// Check overrun error
+	if (tmp & SSP_RIS_ROR){
+		// Clear interrupt
+		SSP_ClearIntPending(LPC_SSP0, SSP_INTCLR_ROR);
+		// update status
+		xf_setup->status |= SSP_STAT_ERROR;
+		// Set Complete Flag
+		complete = SET;
+		return;
+	}
+
+	if ((xf_setup->tx_cnt != xf_setup->length) || (xf_setup->rx_cnt != xf_setup->length)){
+		/* check if RX FIFO contains data */
+		while ((SSP_GetStatus(LPC_SSP0, SSP_STAT_RXFIFO_NOTEMPTY)) && (xf_setup->rx_cnt != xf_setup->length)){
+			// Read data from SSP data
+			tmp = SSP_ReceiveData(LPC_SSP0);
+
+			// Store data to destination
+			if (xf_setup->rx_data != NULL)
+			{
+				if (dataword == 0){
+					*(uint8_t *)((uint32_t)xf_setup->rx_data + xf_setup->rx_cnt) = (uint8_t) tmp;
+				} else {
+					*(uint16_t *)((uint32_t)xf_setup->rx_data + xf_setup->rx_cnt) = (uint16_t) tmp;
+				}
+			}
+			// Increase counter
+			if (dataword == 0){
+				xf_setup->rx_cnt++;
+			} else {
+				xf_setup->rx_cnt += 2;
+			}
+		}
+
+		while ((SSP_GetStatus(LPC_SSP0, SSP_STAT_TXFIFO_NOTFULL)) && (xf_setup->tx_cnt != xf_setup->length)){
+			// Write data to buffer
+			if(xf_setup->tx_data == NULL){
+				if (dataword == 0){
+					SSP_SendData(LPC_SSP0, 0xFF);
+					xf_setup->tx_cnt++;
+				} else {
+					SSP_SendData(LPC_SSP0, 0xFFFF);
+					xf_setup->tx_cnt += 2;
+				}
+			} else {
+				if (dataword == 0){
+					SSP_SendData(LPC_SSP0, (*(uint8_t *)((uint32_t)xf_setup->tx_data + xf_setup->tx_cnt)));
+					xf_setup->tx_cnt++;
+				} else {
+					SSP_SendData(LPC_SSP0, (*(uint16_t *)((uint32_t)xf_setup->tx_data + xf_setup->tx_cnt)));
+					xf_setup->tx_cnt += 2;
+				}
+			}
+
+			// Check overrun error
+			if (SSP_GetRawIntStatus(LPC_SSP0, SSP_INTSTAT_RAW_ROR)){
+				// update status
+				xf_setup->status |= SSP_STAT_ERROR;
+				// Set Complete Flag
+				complete = SET;
+				return;
+			}
+
+			// Check for any data available in RX FIFO
+			while ((SSP_GetStatus(LPC_SSP0, SSP_STAT_RXFIFO_NOTEMPTY)) && (xf_setup->rx_cnt != xf_setup->length)){
+				// Read data from SSP data
+				tmp = SSP_ReceiveData(LPC_SSP0);
+
+				// Store data to destination
+				if (xf_setup->rx_data != NULL)
+				{
+					if (dataword == 0){
+						*(uint8_t *)((uint32_t)xf_setup->rx_data + xf_setup->rx_cnt) = (uint8_t) tmp;
+					} else {
+						*(uint16_t *)((uint32_t)xf_setup->rx_data + xf_setup->rx_cnt) = (uint16_t) tmp;
+					}
+				}
+				// Increase counter
+				if (dataword == 0){
+					xf_setup->rx_cnt++;
+				} else {
+					xf_setup->rx_cnt += 2;
+				}
+			}
+		}
+	}
+
+	// If there more data to sent or receive
+	if ((xf_setup->rx_cnt != xf_setup->length) || (xf_setup->tx_cnt != xf_setup->length)){
+		// Enable all interrupt
+		SSP_IntConfig(LPC_SSP0, SSP_INTCFG_ROR|SSP_INTCFG_RT|SSP_INTCFG_RX|SSP_INTCFG_TX, ENABLE);
+	} else {
+		// Save status
+		xf_setup->status = SSP_STAT_DONE;
+		// Set Complete Flag
+		complete = SET;
+	}
+}
+
+/*-------------------------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		Print Welcome menu
+ * @param[in]	none
+ * @return 		None
+ **********************************************************************/
+void print_menu(void)
+{
+	_DBG(menu1);
+}
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main SSP program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry(void)
+{
+	uint8_t tmpchar[2] = {0, 0};
+	PINSEL_CFG_Type PinCfg;
+	__IO FlagStatus exitflag;
+
+	/*
+	 * Initialize SPI pin connect
+	 * P0.15 - SCK
+	 * P0.16 - SSEL - used as GPIO
+	 * P0.17 - MISO
+	 * P0.18 - MOSI
+	 */
+	PinCfg.Funcnum = 2;
+	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();
+
+	// initialize SSP configuration structure to default
+	SSP_ConfigStructInit(&SSP_ConfigStruct);
+	// Initialize SSP peripheral with parameter given in structure above
+	SSP_Init(LPC_SSP0, &SSP_ConfigStruct);
+
+	// Initialize /CS pin to GPIO function
+	CS_Init();
+
+	// Enable SSP peripheral
+	SSP_Cmd(LPC_SSP0, ENABLE);
+
+    /* preemption = 1, sub-priority = 1 */
+    NVIC_SetPriority(SSP0_IRQn, ((0x01<<3)|0x01));
+    /* Enable SSP0 interrupt */
+    NVIC_EnableIRQ(SSP0_IRQn);
+
+	/* First, send some command to reset SC16IS740 chip via SSP bus interface
+	 * note driver /CS pin to low state before transferring by CS_Enable() function
+	 */
+    complete = RESET;
+	CS_Force(0);
+	xferConfig.tx_data = iocon_cfg;
+	xferConfig.rx_data = sspreadbuf;
+	xferConfig.length = sizeof (iocon_cfg);
+	SSP_ReadWrite(LPC_SSP0, &xferConfig, SSP_TRANSFER_INTERRUPT);
+	while (complete == RESET);
+	CS_Force(1);
+
+	complete = RESET;
+	CS_Force(0);
+	xferConfig.tx_data = iodir_cfg;
+	xferConfig.rx_data = sspreadbuf;
+	xferConfig.length = sizeof (iodir_cfg);
+	SSP_ReadWrite(LPC_SSP0, &xferConfig, SSP_TRANSFER_INTERRUPT);
+	while (complete == RESET);
+	CS_Force(1);
+
+	// Reset exit flag
+	exitflag = RESET;
+
+	/* Read some data from the buffer */
+	while (exitflag == RESET)
+	{
+		while((tmpchar[0] = _DG) == 0);
+
+		if (tmpchar[0] == 27){
+			/* ESC key, set exit flag */
+			_DBG_(menu2);
+			exitflag = SET;
+		}
+		else if (tmpchar[0] == 'r'){
+			print_menu();
+		} else {
+			if (tmpchar[0] == '1')
+			{
+				// LEDs are ON now...
+				CS_Force(0);
+				xferConfig.tx_data = iostate_on;
+				xferConfig.rx_data = sspreadbuf;
+				xferConfig.length = sizeof (iostate_on);
+				SSP_ReadWrite(LPC_SSP0, &xferConfig, SSP_TRANSFER_POLLING);
+				CS_Force(1);
+			}
+			else if (tmpchar[0] == '2')
+			{
+				// LEDs are OFF now...
+				CS_Force(0);
+				xferConfig.tx_data = iostate_off;
+				xferConfig.rx_data = sspreadbuf;
+				xferConfig.length = sizeof (iostate_off);
+				SSP_ReadWrite(LPC_SSP0, &xferConfig, SSP_TRANSFER_POLLING);
+				CS_Force(1);
+			}
+			/* Then Echo it back */
+			_DBG_(tmpchar);
+		}
+	}
+
+    // wait for current transmission complete - THR must be empty
+    while (UART_CheckBusy(LPC_UART0) == SET );
+
+    // DeInitialize UART0 peripheral
+    UART_DeInit(LPC_UART0);
+
+    /* 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
+
+/*
+ * @}
+ */