LPC1700CMSIS_Examples - These are the examples provided for [[/users/fran…

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

USBDEV/USBAudio/usbdmain.c@0:bf7b9fba3924, 2011-03-20 (annotated)

Committer:: frank26080115
Date:: Sun Mar 20 05:38:56 2011 +0000
Revision:: 0:bf7b9fba3924

Who changed what in which revision?

User	Revision	Line number	New contents of line
frank26080115	0:bf7b9fba3924	1	/*----------------------------------------------------------------------------
frank26080115	0:bf7b9fba3924	2	* Name: usbmain.c
frank26080115	0:bf7b9fba3924	3	* Purpose: USB Audio Class Demo
frank26080115	0:bf7b9fba3924	4	* Version: V1.20
frank26080115	0:bf7b9fba3924	5	*----------------------------------------------------------------------------
frank26080115	0:bf7b9fba3924	6	* This software is supplied "AS IS" without any warranties, express,
frank26080115	0:bf7b9fba3924	7	* implied or statutory, including but not limited to the implied
frank26080115	0:bf7b9fba3924	8	* warranties of fitness for purpose, satisfactory quality and
frank26080115	0:bf7b9fba3924	9	* noninfringement. Keil extends you a royalty-free right to reproduce
frank26080115	0:bf7b9fba3924	10	* and distribute executable files created using this software for use
frank26080115	0:bf7b9fba3924	11	* on NXP Semiconductors LPC microcontroller devices only. Nothing else
frank26080115	0:bf7b9fba3924	12	* gives you the right to use this software.
frank26080115	0:bf7b9fba3924	13	*
frank26080115	0:bf7b9fba3924	14	* Copyright (c) 2009 Keil - An ARM Company. All rights reserved.
frank26080115	0:bf7b9fba3924	15	---------------------------------------------------------------------------/
frank26080115	0:bf7b9fba3924	16
frank26080115	0:bf7b9fba3924	17	#include "LPC17xx.h" /* LPC17xx definitions */
frank26080115	0:bf7b9fba3924	18	#include "lpc_types.h"
frank26080115	0:bf7b9fba3924	19
frank26080115	0:bf7b9fba3924	20	#include "usb.h"
frank26080115	0:bf7b9fba3924	21	#include "usbcfg.h"
frank26080115	0:bf7b9fba3924	22	#include "usbhw.h"
frank26080115	0:bf7b9fba3924	23	#include "usbcore.h"
frank26080115	0:bf7b9fba3924	24	#include "usbaudio.h"
frank26080115	0:bf7b9fba3924	25
frank26080115	0:bf7b9fba3924	26	/* Example group ----------------------------------------------------------- */
frank26080115	0:bf7b9fba3924	27	/** @defgroup USBDEV_USBAudio USBAudio
frank26080115	0:bf7b9fba3924	28	* @ingroup USBDEV_Examples
frank26080115	0:bf7b9fba3924	29	* @{
frank26080115	0:bf7b9fba3924	30	*/
frank26080115	0:bf7b9fba3924	31	uint8_t Mute; /* Mute State */
frank26080115	0:bf7b9fba3924	32	uint32_t Volume; /* Volume Level */
frank26080115	0:bf7b9fba3924	33
frank26080115	0:bf7b9fba3924	34	#if USB_DMA
frank26080115	0:bf7b9fba3924	35	uint32_t InfoBuf = (uint32_t )(DMA_BUF_ADR);
frank26080115	0:bf7b9fba3924	36	short DataBuf = (short )(DMA_BUF_ADR + 4*P_C);
frank26080115	0:bf7b9fba3924	37	#else
frank26080115	0:bf7b9fba3924	38	uint32_t InfoBuf[P_C];
frank26080115	0:bf7b9fba3924	39	short DataBuf[B_S]; /* Data Buffer */
frank26080115	0:bf7b9fba3924	40	#endif
frank26080115	0:bf7b9fba3924	41
frank26080115	0:bf7b9fba3924	42	uint16_t DataOut; /* Data Out Index */
frank26080115	0:bf7b9fba3924	43	uint16_t DataIn; /* Data In Index */
frank26080115	0:bf7b9fba3924	44
frank26080115	0:bf7b9fba3924	45	uint8_t DataRun; /* Data Stream Run State */
frank26080115	0:bf7b9fba3924	46	uint16_t PotVal; /* Potenciometer Value */
frank26080115	0:bf7b9fba3924	47	uint32_t VUM; /* VU Meter */
frank26080115	0:bf7b9fba3924	48	uint32_t Tick; /* Time Tick */
frank26080115	0:bf7b9fba3924	49
frank26080115	0:bf7b9fba3924	50
frank26080115	0:bf7b9fba3924	51	/*
frank26080115	0:bf7b9fba3924	52	* Get Potenciometer Value
frank26080115	0:bf7b9fba3924	53	*/
frank26080115	0:bf7b9fba3924	54
frank26080115	0:bf7b9fba3924	55	void get_potval (void) {
frank26080115	0:bf7b9fba3924	56	uint32_t val;
frank26080115	0:bf7b9fba3924	57
frank26080115	0:bf7b9fba3924	58	LPC_ADC->ADCR \|= 0x01000000; /* Start A/D Conversion */
frank26080115	0:bf7b9fba3924	59	do {
frank26080115	0:bf7b9fba3924	60	val = LPC_ADC->ADGDR; /* Read A/D Data Register */
frank26080115	0:bf7b9fba3924	61	} while ((val & 0x80000000) == 0); /* Wait for end of A/D Conversion */
frank26080115	0:bf7b9fba3924	62	LPC_ADC->ADCR &= ~0x01000000; /* Stop A/D Conversion */
frank26080115	0:bf7b9fba3924	63	PotVal = ((val >> 8) & 0xF8) + /* Extract Potenciometer Value */
frank26080115	0:bf7b9fba3924	64	((val >> 7) & 0x08);
frank26080115	0:bf7b9fba3924	65	}
frank26080115	0:bf7b9fba3924	66
frank26080115	0:bf7b9fba3924	67
frank26080115	0:bf7b9fba3924	68	/*
frank26080115	0:bf7b9fba3924	69	* Timer Counter 0 Interrupt Service Routine
frank26080115	0:bf7b9fba3924	70	* executed each 31.25us (32kHz frequency)
frank26080115	0:bf7b9fba3924	71	*/
frank26080115	0:bf7b9fba3924	72
frank26080115	0:bf7b9fba3924	73	void TIMER0_IRQHandler(void)
frank26080115	0:bf7b9fba3924	74	{
frank26080115	0:bf7b9fba3924	75	long val;
frank26080115	0:bf7b9fba3924	76	uint32_t cnt;
frank26080115	0:bf7b9fba3924	77
frank26080115	0:bf7b9fba3924	78	if (DataRun) { /* Data Stream is running */
frank26080115	0:bf7b9fba3924	79	val = DataBuf[DataOut]; /* Get Audio Sample */
frank26080115	0:bf7b9fba3924	80	cnt = (DataIn - DataOut) & (B_S - 1); /* Buffer Data Count */
frank26080115	0:bf7b9fba3924	81	if (cnt == (B_S - P_CP_S)) { / Too much Data in Buffer */
frank26080115	0:bf7b9fba3924	82	DataOut++; /* Skip one Sample */
frank26080115	0:bf7b9fba3924	83	}
frank26080115	0:bf7b9fba3924	84	if (cnt > (P_CP_S)) { / Still enough Data in Buffer */
frank26080115	0:bf7b9fba3924	85	DataOut++; /* Update Data Out Index */
frank26080115	0:bf7b9fba3924	86	}
frank26080115	0:bf7b9fba3924	87	DataOut &= B_S - 1; /* Adjust Buffer Out Index */
frank26080115	0:bf7b9fba3924	88	if (val < 0) VUM -= val; /* Accumulate Neg Value */
frank26080115	0:bf7b9fba3924	89	else VUM += val; /* Accumulate Pos Value */
frank26080115	0:bf7b9fba3924	90	val = Volume; / Apply Volume Level */
frank26080115	0:bf7b9fba3924	91	val >>= 16; /* Adjust Value */
frank26080115	0:bf7b9fba3924	92	val += 0x8000; /* Add Bias */
frank26080115	0:bf7b9fba3924	93	val &= 0xFFFF; /* Mask Value */
frank26080115	0:bf7b9fba3924	94	} else {
frank26080115	0:bf7b9fba3924	95	val = 0x8000; /* DAC Middle Point */
frank26080115	0:bf7b9fba3924	96	}
frank26080115	0:bf7b9fba3924	97
frank26080115	0:bf7b9fba3924	98	if (Mute) {
frank26080115	0:bf7b9fba3924	99	val = 0x8000; /* DAC Middle Point */
frank26080115	0:bf7b9fba3924	100	}
frank26080115	0:bf7b9fba3924	101
frank26080115	0:bf7b9fba3924	102	LPC_DAC->DACR = val & 0xFFC0; /* Set Speaker Output */
frank26080115	0:bf7b9fba3924	103
frank26080115	0:bf7b9fba3924	104	if ((Tick++ & 0x03FF) == 0) { /* On every 1024th Tick */
frank26080115	0:bf7b9fba3924	105	get_potval(); /* Get Potenciometer Value */
frank26080115	0:bf7b9fba3924	106	if (VolCur == 0x8000) { /* Check for Minimum Level */
frank26080115	0:bf7b9fba3924	107	Volume = 0; /* No Sound */
frank26080115	0:bf7b9fba3924	108	} else {
frank26080115	0:bf7b9fba3924	109	Volume = VolCur * PotVal; /* Chained Volume Level */
frank26080115	0:bf7b9fba3924	110	}
frank26080115	0:bf7b9fba3924	111	val = VUM >> 20; /* Scale Accumulated Value */
frank26080115	0:bf7b9fba3924	112	VUM = 0; /* Clear VUM */
frank26080115	0:bf7b9fba3924	113	if (val > 7) val = 7; /* Limit Value */
frank26080115	0:bf7b9fba3924	114	}
frank26080115	0:bf7b9fba3924	115
frank26080115	0:bf7b9fba3924	116	LPC_TIM0->IR = 1; /* Clear Interrupt Flag */
frank26080115	0:bf7b9fba3924	117	}
frank26080115	0:bf7b9fba3924	118
frank26080115	0:bf7b9fba3924	119
frank26080115	0:bf7b9fba3924	120
frank26080115	0:bf7b9fba3924	121	/*****************************************************************************
frank26080115	0:bf7b9fba3924	122	** Main Function main()
frank26080115	0:bf7b9fba3924	123	******************************************************************************/
frank26080115	0:bf7b9fba3924	124	int main (void)
frank26080115	0:bf7b9fba3924	125	{
frank26080115	0:bf7b9fba3924	126	volatile uint32_t pclkdiv, pclk;
frank26080115	0:bf7b9fba3924	127
frank26080115	0:bf7b9fba3924	128	// SystemInit();
frank26080115	0:bf7b9fba3924	129
frank26080115	0:bf7b9fba3924	130	LPC_PINCON->PINSEL1 &=~((0x03<<18)\|(0x03<<20));
frank26080115	0:bf7b9fba3924	131	/* P0.25, A0.0, function 01, P0.26 AOUT, function 10 */
frank26080115	0:bf7b9fba3924	132	LPC_PINCON->PINSEL1 \|= ((0x01<<18)\|(0x02<<20));
frank26080115	0:bf7b9fba3924	133
frank26080115	0:bf7b9fba3924	134	/* Enable CLOCK into ADC controller */
frank26080115	0:bf7b9fba3924	135	LPC_SC->PCONP \|= (1 << 12);
frank26080115	0:bf7b9fba3924	136
frank26080115	0:bf7b9fba3924	137	LPC_ADC->ADCR = 0x00200E04; /* ADC: 10-bit AIN2 @ 4MHz */
frank26080115	0:bf7b9fba3924	138	LPC_DAC->DACR = 0x00008000; /* DAC Output set to Middle Point */
frank26080115	0:bf7b9fba3924	139
frank26080115	0:bf7b9fba3924	140	/* By default, the PCLKSELx value is zero, thus, the PCLK for
frank26080115	0:bf7b9fba3924	141	all the peripherals is 1/4 of the SystemFrequency. */
frank26080115	0:bf7b9fba3924	142	/* Bit 2~3 is for TIMER0 */
frank26080115	0:bf7b9fba3924	143	pclkdiv = (LPC_SC->PCLKSEL0 >> 2) & 0x03;
frank26080115	0:bf7b9fba3924	144	switch ( pclkdiv )
frank26080115	0:bf7b9fba3924	145	{
frank26080115	0:bf7b9fba3924	146	case 0x00:
frank26080115	0:bf7b9fba3924	147	default:
frank26080115	0:bf7b9fba3924	148	pclk = SystemCoreClock/4;
frank26080115	0:bf7b9fba3924	149	break;
frank26080115	0:bf7b9fba3924	150	case 0x01:
frank26080115	0:bf7b9fba3924	151	pclk = SystemCoreClock;
frank26080115	0:bf7b9fba3924	152	break;
frank26080115	0:bf7b9fba3924	153	case 0x02:
frank26080115	0:bf7b9fba3924	154	pclk = SystemCoreClock/2;
frank26080115	0:bf7b9fba3924	155	break;
frank26080115	0:bf7b9fba3924	156	case 0x03:
frank26080115	0:bf7b9fba3924	157	pclk = SystemCoreClock/8;
frank26080115	0:bf7b9fba3924	158	break;
frank26080115	0:bf7b9fba3924	159	}
frank26080115	0:bf7b9fba3924	160
frank26080115	0:bf7b9fba3924	161	LPC_TIM0->MR0 = pclk/DATA_FREQ - 1; /* TC0 Match Value 0 */
frank26080115	0:bf7b9fba3924	162	LPC_TIM0->MCR = 3; /* TCO Interrupt and Reset on MR0 */
frank26080115	0:bf7b9fba3924	163	LPC_TIM0->TCR = 1; /* TC0 Enable */
frank26080115	0:bf7b9fba3924	164	NVIC_EnableIRQ(TIMER0_IRQn);
frank26080115	0:bf7b9fba3924	165
frank26080115	0:bf7b9fba3924	166	USB_Init(); /* USB Initialization */
frank26080115	0:bf7b9fba3924	167	USB_Connect(TRUE); /* USB Connect */
frank26080115	0:bf7b9fba3924	168
frank26080115	0:bf7b9fba3924	169	/******* The main Function is an endless loop *********/
frank26080115	0:bf7b9fba3924	170	while( 1 );
frank26080115	0:bf7b9fba3924	171	}
frank26080115	0:bf7b9fba3924	172
frank26080115	0:bf7b9fba3924	173	/******************************************************************************
frank26080115	0:bf7b9fba3924	174	** End Of File
frank26080115	0:bf7b9fba3924	175	******************************************************************************/
frank26080115	0:bf7b9fba3924	176	/*
frank26080115	0:bf7b9fba3924	177	* @}
frank26080115	0:bf7b9fba3924	178	*/

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Type:	Program
Created:	20 Mar 2011
Imports:	199
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	7

USBDEV/USBAudio/usbdmain.c@0:bf7b9fba3924, 2011-03-20 (annotated)

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