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/*---------------------------------------------------------------------------- |
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* Name: DEMO.C |
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* Purpose: USB Audio Demo |
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* Version: V1.10 |
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*---------------------------------------------------------------------------- |
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* This file is part of the uVision/ARM development tools. |
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* This software may only be used under the terms of a valid, current, |
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* end user licence from KEIL for a compatible version of KEIL software |
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* development tools. Nothing else gives you the right to use it. |
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* |
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* Copyright (c) 2005-2007 Keil Software. |
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*---------------------------------------------------------------------------*/ |
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#include <LPC23XX.H> /* LPC23xx definitions */ |
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#include "type.h" |
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#include "usb.h" |
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#include "usbcfg.h" |
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#include "usbhw.h" |
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#include "usbcore.h" |
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#include "demo.h" |
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BYTE Mute; /* Mute State */ |
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DWORD Volume; /* Volume Level */ |
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#if USB_DMA |
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#pragma arm section zidata = "USB_RAM" |
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DWORD InfoBuf[P_C]; /* Packet Info Buffer */ |
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short DataBuf[B_S]; /* Data Buffer */ |
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#pragma arm section zidata |
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#else |
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short DataBuf[B_S]; /* Data Buffer */ |
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#endif |
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WORD DataOut; /* Data Out Index */ |
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WORD DataIn; /* Data In Index */ |
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BYTE DataRun; /* Data Stream Run State */ |
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WORD PotVal; /* Potenciometer Value */ |
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DWORD VUM; /* VU Meter */ |
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DWORD Tick; /* Time Tick */ |
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/* |
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* Get Potenciometer Value |
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*/ |
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void get_potval (void) |
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{ |
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DWORD val; |
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AD0CR |= 0x01000000; /* Start A/D Conversion */ |
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do { |
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val = AD0GDR; /* Read A/D Data Register */ |
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} while ((val & 0x80000000) == 0); /* Wait for end of A/D Conversion */ |
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AD0CR &= ~0x01000000; /* Stop A/D Conversion */ |
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PotVal = ((val >> 8) & 0xF8) + /* Extract Potenciometer Value */ |
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((val >> 7) & 0x08); |
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} |
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/* |
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* Timer Counter 0 Interrupt Service Routine |
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* executed each 31.25us (32kHz frequency) |
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*/ |
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void tc0_isr (void) __irq |
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{ |
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long val; |
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DWORD cnt; |
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if (DataRun) { /* Data Stream is running */ |
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val = DataBuf[DataOut]; /* Get Audio Sample */ |
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cnt = (DataIn - DataOut) & (B_S - 1); /* Buffer Data Count */ |
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if (cnt == (B_S - P_C*P_S)) { /* Too much Data in Buffer */ |
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DataOut++; /* Skip one Sample */ |
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} |
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if (cnt > (P_C*P_S)) { /* Still enough Data in Buffer */ |
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DataOut++; /* Update Data Out Index */ |
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} |
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DataOut &= B_S - 1; /* Adjust Buffer Out Index */ |
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if (val < 0) VUM -= val; /* Accumulate Neg Value */ |
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else VUM += val; /* Accumulate Pos Value */ |
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val *= Volume; /* Apply Volume Level */ |
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val >>= 16; /* Adjust Value */ |
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val += 0x8000; /* Add Bias */ |
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val &= 0xFFFF; /* Mask Value */ |
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} else { |
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val = 0x8000; /* DAC Middle Point */ |
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} |
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if (Mute) { |
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val = 0x8000; /* DAC Middle Point */ |
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} |
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DACR = val & 0xFFC0; /* Set Speaker Output */ |
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if ((Tick++ & 0x03FF) == 0) { /* On every 1024th Tick */ |
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get_potval(); /* Get Potenciometer Value */ |
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if (VolCur == 0x8000) { /* Check for Minimum Level */ |
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Volume = 0; /* No Sound */ |
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} else { |
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Volume = VolCur * PotVal; /* Chained Volume Level */ |
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} |
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val = VUM >> 20; /* Scale Accumulated Value */ |
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VUM = 0; /* Clear VUM */ |
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if (val > 7) val = 7; /* Limit Value */ |
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FIO2CLR = LEDMSK; /* Turn Off all LEDs */ |
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FIO2SET = LEDMSK >> (7 - val); /* LEDs show VU Meter */ |
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} |
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T0IR = 1; /* Clear Interrupt Flag */ |
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VICVectAddr = 0; /* Acknowledge Interrupt */ |
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} |
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/* Main Program */ |
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int main (void) |
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{ |
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PINSEL10 = 0; /* Disable ETM Interfaces */ |
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PINSEL1 = 0x00204000; /* Select AOUT,AIN0 */ |
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FIO2DIR = LEDMSK; /* P2[0..7] = Output only */ |
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PCONP |= (1 << 12); /* Enable power to AD block */ |
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AD0CR = 0x00200E01; /* ADC: 10-bit AIN0 @ 4MHz */ |
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DACR = 0x00008000; /* DAC Output set to Middle Point */ |
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/* Setup Timer Counter 0: Periodic Timer with Interrupt at DATA_FREQ Rate */ |
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T0MR0 = VPB_CLOCK/DATA_FREQ - 1; /* TC0 Match Value 0 */ |
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T0MCR = 3; /* TCO Interrupt and Reset on MR0 */ |
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T0TCR = 1; /* TC0 Enable */ |
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/* Setup Timer Counter 0 Interrupt */ |
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VICVectAddr4 = (unsigned long)tc0_isr; /* TC0 Interrupt -> Vector 4 */ |
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VICVectCntl4 = 0x02; /* TC0 Interrupt -> Priority 2 */ |
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VICIntEnable = 1 << 4; /* Enable TC0 Interrupt */ |
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USB_Init(); /* USB Initialization */ |
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USB_Connect(TRUE); /* USB Connect */ |
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while (1); /* Loop forever */ |
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} |
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