Diff: I2S/I2S_two_kit/i2s_two_kit.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/I2S/I2S_two_kit/i2s_two_kit.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,274 @@
+/***********************************************************************//**
+ * @file		i2s_two_kit.c
+ * @purpose		This example describes how to use I2S tranfer data between
+ * 			  	two 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_i2s.h"
+#include "lpc17xx_libcfg.h"
+#include "lpc17xx_pinsel.h"
+#include "debug_frmwrk.h"
+
+
+/* Example group ----------------------------------------------------------- */
+/** @defgroup I2S_two_kit	I2S_two_kit
+ * @ingroup I2S_Examples
+ * @{
+ */
+
+/************************** PRIVATE DEFINITIONS *************************/
+#define I2S_TRANSMIT			0
+#define I2S_RECEIVE				!I2S_TRANSMIT
+
+
+/************************** 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 on 2 board to transfer data \n\r"
+	"********************************************************************************\n\r";
+uint8_t tx_depth_irq = 0;
+uint8_t rx_depth_irq = 0;
+uint32_t data;
+
+/************************** PRIVATE FUNCTIONS *************************/
+/* Interrupt service routine */
+void I2S_IRQHandler(void);
+
+void print_menu(void);
+
+/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
+/*********************************************************************//**
+ * @brief		I2S IRQ Handler
+ * @param[in]	None
+ * @return 		None
+ **********************************************************************/
+void I2S_IRQHandler()
+{
+	uint8_t rx_level,
+			tx_level,
+			tx_depth_irq,
+			rx_depth_irq;
+	uint32_t data;
+	uint8_t i;
+
+	if(I2S_GetIRQStatus(LPC_I2S, I2S_RX_MODE)){ //receive interrupt
+		rx_level = I2S_GetLevel(LPC_I2S, I2S_RX_MODE);
+		rx_depth_irq = I2S_GetIRQDepth(LPC_I2S, I2S_RX_MODE);
+
+		if (rx_level >= rx_depth_irq)//receive interrupt
+		{
+			while(I2S_GetLevel(LPC_I2S, I2S_RX_MODE)>0)
+			{
+				data = I2S_Receive(LPC_I2S);
+				_DBH32(data); _DBG_("");
+			}
+		}
+	}
+	else if (I2S_GetIRQStatus(LPC_I2S, I2S_TX_MODE))
+	{
+		tx_level = I2S_GetLevel(LPC_I2S, I2S_TX_MODE);
+		tx_depth_irq = I2S_GetIRQDepth(LPC_I2S, I2S_TX_MODE);
+		if(tx_level <= tx_depth_irq)//transmit interrupt
+		{
+			for(i=0;i<4;i++)
+			{
+				I2S_Send(LPC_I2S,data);
+				_DBH32(data);
+				_DBG_(" Send successful!!!");
+				data++;
+				if(data == 0xFFFFFFFF) data  = 0;
+			}
+		}
+	}
+}
+
+/*-------------------------PRIVATE FUNCTIONS------------------------------*/
+/*********************************************************************//**
+ * @brief		print_menu
+ * @param[in]	None
+ * @return 		None
+ **********************************************************************/
+void print_menu()
+{
+	_DBG_(menu);
+}
+
+
+/*-------------------------MAIN FUNCTION------------------------------*/
+/*********************************************************************//**
+ * @brief		c_entry: Main I2S program body
+ * @param[in]	None
+ * @return 		int
+ **********************************************************************/
+int c_entry (void) {
+	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();
+
+	NVIC_EnableIRQ(I2S_IRQn);
+	//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)
+	 */
+
+#if I2S_TRANSMIT
+	/* Pin configuration for I2S Transmitter:
+	 * Assign: 	- 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 = 7;
+	PinCfg.Portnum = 0;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 8;
+	PINSEL_ConfigPin(&PinCfg);
+	PinCfg.Pinnum = 9;
+	PINSEL_ConfigPin(&PinCfg);
+
+	I2S_Init(LPC_I2S);
+
+	/* 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_SLAVE_MODE;
+	I2S_ConfigStruct.mute = I2S_MUTE_ENABLE;
+	I2S_Config(LPC_I2S,I2S_TX_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);
+
+	LPC_I2S->I2STXRATE = 0x00;
+	LPC_I2S->I2STXBITRATE = 0x00;
+	I2S_SetBitRate(LPC_I2S, 0, I2S_TX_MODE);
+
+	I2S_Start(LPC_I2S);
+	I2S_IRQConfig(LPC_I2S,I2S_TX_MODE,4);
+	I2S_IRQCmd(LPC_I2S,I2S_TX_MODE,ENABLE);
+
+#else
+	/* Pin configuration for I2S Receiver:
+	 * Assign: 	- P0.4 as I2SRX_CLK
+	 * 			- P0.5 as I2SRX_WS
+	 * 			- P0.6 as I2SRX_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);
+
+	I2S_Init(LPC_I2S);
+
+	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_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_RX_MODE);
+
+	/* Set up frequency and bit rate*/
+	I2S_FreqConfig(LPC_I2S, 44100, I2S_RX_MODE);
+	I2S_IRQConfig(LPC_I2S,I2S_RX_MODE,4);
+	I2S_IRQCmd(LPC_I2S,I2S_RX_MODE,ENABLE);
+
+	_DBG_("Press '1' to start I2S operation...");
+	while(_DG !='1');
+	I2S_Start(LPC_I2S);
+	_DBG_("I2S Start ...");
+#endif
+	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
+
+/*
+ * @}
+ */