Diff: I2S/Polling/i2s_polling.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/I2S/Polling/i2s_polling.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,286 @@
+/***********************************************************************//**
+ * @file		i2s_polling.c
+ * @purpose		This example describes how to use I2S transfer in polling
+ *           	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_i2s.h"
+#include "lpc17xx_libcfg.h"
+#include "lpc17xx_pinsel.h"
+#include "debug_frmwrk.h"
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup I2S_Polling	Polling
+ * @ingroup I2S_Examples
+ * @{
+ */
+
+/************************** PRIVATE DEFINITIONS *************************/
+/** Max buffer length */
+#define BUFFER_SIZE			0x400
+/** I2S Buffer Source Address is AHBRAM1_BASE that used for USB RAM purpose, but
+ * it is not used in this example, so this memory section can be used for general purpose
+ * memory
+ */
+#define I2S_BUFFER_SRC			LPC_AHBRAM1_BASE
+/** I2S Buffer Destination Address is (AHBRAM1_BASE + 0x100UL) that used for USB RAM purpose, but
+ * it is not used in this example, so this memory section can be used for general purpose
+ * memory
+ */
+#define I2S_BUFFER_DST			(I2S_BUFFER_SRC+0x1000UL)
+
+/************************** PRIVATE VARIABLE ***********************/
+uint8_t menu[]=
+	"********************************************************************************\n\r"
+	"Hello NXP Semiconductors \n\r"
+	" I2S polling mode demo \n\r"
+	"\t - MCU: LPC17xx \n\r"
+	"\t - Core: ARM CORTEX-M3 \n\r"
+	"\t - Communicate via: UART0 - 115200 bps \n\r"
+	" Use two I2S channels in the same board to transfer data in polling mode\n\r"
+	"********************************************************************************\n\r";
+
+volatile uint8_t  I2STXDone = 0;
+volatile uint8_t  I2SRXDone = 0;
+
+volatile uint32_t *I2STXBuffer = (uint32_t*)(I2S_BUFFER_SRC);
+volatile uint32_t *I2SRXBuffer = (uint32_t *)(I2S_BUFFER_DST);
+
+volatile uint32_t I2SReadLength = 0;
+volatile uint32_t I2SWriteLength = 0;
+
+/************************** PRIVATE FUNCTIONS *************************/
+void Buffer_Init(void);
+Bool Buffer_Verify(void);
+void print_menu(void);
+
+/*-------------------------PRIVATE FUNCTIONS------------------------------*/
+/*********************************************************************//**
+ * @brief		Initialize buffer
+ * @param[in]	None
+ * @return 		None
+ **********************************************************************/
+void Buffer_Init(void) {
+	uint32_t i;
+
+	for (i = 0; i < BUFFER_SIZE; i++) {
+		I2STXBuffer[i] = i+1;
+		I2SRXBuffer[i] = 0;
+	}
+}
+
+/*********************************************************************//**
+ * @brief		Verify buffer
+ * @param[in]	none
+ * @return 		TRUE: if two buffers are similar
+ * 				FALSE: if two buffers are different
+ **********************************************************************/
+Bool Buffer_Verify(void) {
+	uint32_t i;
+	uint32_t *pTX = (uint32_t *) &I2STXBuffer[0];
+	/* Generally, first element of RX buffer is a dummy data, so
+	 * it will be discarded
+	 */
+	uint32_t *pRX = (uint32_t *) &I2SRXBuffer[1];
+
+	for (i = 1; i < BUFFER_SIZE; i++) {
+		if (*pTX++ != *pRX++)  {
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+/*********************************************************************//**
+ * @brief		Print menu
+ * @param[in]	none
+ * @return 		None
+ **********************************************************************/
+void print_menu(void)
+{
+	_DBG_(menu);
+}
+
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main I2S program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry (void) {
+	uint32_t i;
+	uint32_t dummy=0;
+	I2S_MODEConf_Type I2S_ClkConfig;
+	I2S_CFG_Type I2S_ConfigStruct;
+	PINSEL_CFG_Type PinCfg;
+
+	/* Initialize debug via UART0
+	 * – 115200bps
+	 * – 8 data bit
+	 * – No parity
+	 * – 1 stop bit
+	 * – No flow control
+	 */
+	debug_frmwrk_init();
+
+	//print menu screen
+	print_menu();
+
+	Buffer_Init();
+
+	/* Pin configuration:
+	 * Assign: 	- P0.4 as I2SRX_CLK
+	 * 			- P0.5 as I2SRX_WS
+	 * 			- P0.6 as I2SRX_SDA
+	 * 			- P0.7 as I2STX_CLK
+	 * 			- P0.8 as I2STX_WS
+	 * 			- P0.9 as I2STX_SDA
+	 */
+	PinCfg.Funcnum = 1;
+	PinCfg.OpenDrain = 0;
+	PinCfg.Pinmode = 0;
+	PinCfg.Pinnum = 4;
+	PinCfg.Portnum = 0;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 5;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 6;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 7;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 8;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 9;
+	PINSEL_ConfigPin(&PinCfg);
+
+	I2S_Init(LPC_I2S);
+
+	//Setup for I2S: RX is similar with TX
+	/* setup:
+	 * 		- wordwidth: 16 bits
+	 * 		- stereo mode
+	 * 		- master mode for I2S_TX and slave for I2S_RX
+	 * 		- ws_halfperiod is 31
+	 * 		- not use mute mode
+	 * 		- use reset and stop mode
+	 * 		- select the fractional rate divider clock output as the source,
+	 * 		- disable 4-pin mode
+	 * 		- MCLK ouput is disable
+	 * 		- Frequency = 44.1 kHz (x=8,y=51 - automatic setting)
+	 * Because we use mode I2STXMODE[3:0]= 0000, I2SDAO[5]=0 and
+	 * I2SRX[3:0]=0000, I2SDAI[5] = 1. So we have I2SRX_CLK = I2STX_CLK
+	 * --> I2SRXBITRATE = 1 (not divide TXCLK to produce RXCLK)
+	 */
+
+	/* Audio Config*/
+	I2S_ConfigStruct.wordwidth = I2S_WORDWIDTH_16;
+	I2S_ConfigStruct.mono = I2S_STEREO;
+	I2S_ConfigStruct.stop = I2S_STOP_ENABLE;
+	I2S_ConfigStruct.reset = I2S_RESET_ENABLE;
+	I2S_ConfigStruct.ws_sel = I2S_MASTER_MODE;
+	I2S_ConfigStruct.mute = I2S_MUTE_DISABLE;
+	I2S_Config(LPC_I2S,I2S_TX_MODE,&I2S_ConfigStruct);
+
+	I2S_ConfigStruct.ws_sel = I2S_SLAVE_MODE;
+	I2S_Config(LPC_I2S,I2S_RX_MODE,&I2S_ConfigStruct);
+
+	/* Clock Mode Config*/
+	I2S_ClkConfig.clksel = I2S_CLKSEL_FRDCLK;
+	I2S_ClkConfig.fpin = I2S_4PIN_DISABLE;
+	I2S_ClkConfig.mcena = I2S_MCLK_DISABLE;
+	I2S_ModeConfig(LPC_I2S,&I2S_ClkConfig,I2S_TX_MODE);
+	I2S_ModeConfig(LPC_I2S,&I2S_ClkConfig,I2S_RX_MODE);
+
+	/* Set up frequency and bit rate*/
+	I2S_FreqConfig(LPC_I2S, 44100, I2S_TX_MODE);
+	I2S_SetBitRate(LPC_I2S, 0, I2S_RX_MODE);
+
+	I2S_Start(LPC_I2S);
+	 while(I2STXDone == 0||I2SRXDone == 0){
+		if(I2STXDone ==0){
+			 I2S_Send(LPC_I2S,I2STXBuffer[I2SWriteLength]);
+			 I2SWriteLength +=1;
+			 if(I2SWriteLength == BUFFER_SIZE) I2STXDone = 1;
+		}
+		if(I2SRXDone == 0)
+		{
+			while(I2S_GetLevel(LPC_I2S,I2S_RX_MODE)==0x00);
+			if(dummy == 0) //dummy receive
+			{
+				i = I2S_Receive(LPC_I2S);
+				dummy = 1;
+			}
+			else
+			{
+				*(uint32_t *)(&I2SRXBuffer[I2SReadLength]) = I2S_Receive(LPC_I2S);
+				I2SReadLength +=1;
+			}
+			if(I2SReadLength == BUFFER_SIZE) I2SRXDone = 1;
+		}
+	 }
+
+	 /* print received data */
+	 _DBG_("Receive Buffer data: ...");
+	 for(i=0;i<BUFFER_SIZE;i++)
+	 {
+		 _DBH32(I2SRXBuffer[i]);_DBG_("");
+	 }
+
+	 /* Validate received data */
+	 if(Buffer_Verify())
+	 {
+		 _DBG_("Verify Buffer: OK...");
+	 }
+	 else
+	 {
+		 _DBG_("Verify Buffer: ERROR...");
+	 }
+	 I2S_DeInit(LPC_I2S);
+	 while(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
+
+/*
+ * @}
+ */