These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
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 + +/* + * @} + */