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/*---------------------------------------------------------------------------------
$Id$
Microphone control for the ARM7
Copyright (C) 2005
Michael Noland (joat)
Jason Rogers (dovoto)
Dave Murphy (WinterMute)
Chris Double (doublec)
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any
damages arising from the use of this software.
Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you
must not claim that you wrote the original software. If you use
this software in a product, an acknowledgment in the product
documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and
must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source
distribution.
---------------------------------------------------------------------------------*/
#include <nds/arm7/audio.h>
#include <nds/timers.h>
//---------------------------------------------------------------------------------
// Turn on the Microphone Amp. Code based on neimod's example.
//---------------------------------------------------------------------------------
void PM_SetAmp(u8 control) {
//---------------------------------------------------------------------------------
SerialWaitBusy();
REG_SPICNT = SPI_ENABLE | SPI_DEVICE_POWER | SPI_BAUD_1MHz | SPI_CONTINUOUS;
REG_SPIDATA = PM_AMP_OFFSET;
SerialWaitBusy();
REG_SPICNT = SPI_ENABLE | SPI_DEVICE_POWER | SPI_BAUD_1MHz;
REG_SPIDATA = control;
}
//---------------------------------------------------------------------------------
// Read a byte from the microphone. Code based on neimod's example.
//---------------------------------------------------------------------------------
u8 MIC_ReadData() {
//---------------------------------------------------------------------------------
u16 result, result2;
SerialWaitBusy();
REG_SPICNT = SPI_ENABLE | SPI_DEVICE_MICROPHONE | SPI_BAUD_2MHz | SPI_CONTINUOUS;
REG_SPIDATA = 0xEC; // Touchscreen command format for AUX
SerialWaitBusy();
REG_SPIDATA = 0x00;
SerialWaitBusy();
result = REG_SPIDATA;
REG_SPICNT = SPI_ENABLE | SPI_DEVICE_TOUCH | SPI_BAUD_2MHz;
REG_SPIDATA = 0x00;
SerialWaitBusy();
result2 = REG_SPIDATA;
return (((result & 0x7F) << 1) | ((result2>>7)&1));
}
static u8* microphone_buffer = 0;
static int microphone_buffer_length = 0;
static int current_length = 0;
//---------------------------------------------------------------------------------
void StartRecording(u8* buffer, int length) {
//---------------------------------------------------------------------------------
microphone_buffer = buffer;
microphone_buffer_length = length;
current_length = 0;
MIC_On();
// Setup a 16kHz timer
TIMER0_DATA = 0xF7CF;
TIMER0_CR = TIMER_ENABLE | TIMER_DIV_1 | TIMER_IRQ_REQ;
}
//---------------------------------------------------------------------------------
int StopRecording() {
//---------------------------------------------------------------------------------
TIMER0_CR &= ~TIMER_ENABLE;
MIC_Off();
microphone_buffer = 0;
return current_length;
}
//---------------------------------------------------------------------------------
void ProcessMicrophoneTimerIRQ() {
//---------------------------------------------------------------------------------
if(microphone_buffer && microphone_buffer_length > 0) {
// Read data from the microphone. Data from the Mic is unsigned, flipping
// the highest bit makes it signed.
*microphone_buffer++ = MIC_ReadData() ^ 0x80;
--microphone_buffer_length;
current_length++;
}
}
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