/*----------------------------------------------------------------
字节数据传送函数
函数原型: unsigned char I2C_RcvByte();
功能: 用来接收从器件传来的数据,并判断总线错误(不发应答信号)，
发完后请用应答函数。
------------------------------------------------------------------*/
unsigned char I2C_RcvByte(void)
{
unsigned char retc;
unsigned char BitCnt;
retc=0;
SDA(1); //置数据线为输入方式
for(BitCnt = 0; BitCnt < 8; BitCnt++)
{
_Nop();
SCL(0); //置时钟线为低，准备接收数据位
_Nop();
_Nop(); //时钟低电平周期大于4.7us
_Nop();
_Nop();
_Nop();
SCL(1); //置时钟线为高使数据线上数据有效
_Nop();
_Nop();
retc = retc << 1;
if(Read_SDA())
retc = retc + 1; //读数据位,接收的数据位放入retc中
_Nop();
_Nop();
}
SCL(0);
_Nop();
_Nop();
return(retc);
}
/*----------------------------------------------------------------
字节数据传送函数
函数原型: void SendByte(unsigned char c);
功能: 将数据c发送出去,可以是地址,也可以是数据,发完后等待应答,并对
此状态位进行操作.(不应答或非应答都使ack=0 假)
发送数据正常，ack=1; ack=0表示被控器无应答或损坏。
------------------------------------------------------------------*/
void I2C_SendByte(unsigned char c)
{
unsigned char BitCnt;
for(BitCnt = 0; BitCnt < 8; BitCnt++) //要传送的数据长度为8位
{
if(( c << BitCnt) & 0x80) //判断发送位
{
SDA(1);
}
else
{
SDA(0);
}
_delay_us(10);
SCL(1); //置时钟线为高，通知被控器开始接收数据位
_delay_us(15); //保证时钟高电平周期大于4μ
SCL(0);
}
//SDA(1); //8位发送完后释放数据线，准备接收应答位
DDRF &= ~(1 << PF7); // 变为输入
PORTF |= (1 << PF7);
_delay_us(30); // without this wait read unstable value.
SCL(1);
_delay_us(15);
if(Read_SDA())
ack = 0;
else
ack = 1; //判断是否接收到应答信号
SCL(0);
SDA(0); // 变为输出
_delay_us(10);
}
/*------------------------------------------------
启动总线
------------------------------------------------*/
void I2C_Start(void)
{
SDA(1); //发送起始条件的数据信号
_delay_us(5);
SCL(1);
_delay_us(10); //起始条件建立时间大于4.7us,延时
SDA(0); //发送起始信号
_delay_us(10); //起始条件锁定时间大于4μ
SCL(0); //钳住I2C总线，准备发送或接收数据
_delay_us(10);
}
SpecialCaseList *SpecialCaseList::create(
const MemoryBuffer *MB, std::string &Error) {
OwningPtr<SpecialCaseList> SCL(new SpecialCaseList());
if (!SCL->parse(MB, Error))
return 0;
return SCL.take();
}
std::unique_ptr<SpecialCaseList> SpecialCaseList::create(const MemoryBuffer *MB,
std::string &Error) {
std::unique_ptr<SpecialCaseList> SCL(new SpecialCaseList());
if (SCL->createInternal(MB, Error))
return SCL;
return nullptr;
}
/*----------------------------------------------------------------
非应答子函数
原型: void NoAck_I2c(void);
----------------------------------------------------------------*/
void NoAck_I2c(void)
{
SDA(1);
_Nop();
_Nop();
_Nop();
SCL(1);
_Nop();
_Nop(); //时钟低电平周期大于4μ
_Nop();
_Nop();
_Nop();
SCL(0); //清时钟线，钳住I2C总线以便继续接收
_Nop();
_Nop();
}
std::unique_ptr<SpecialCaseList>
SpecialCaseList::create(const std::vector<std::string> &Paths,
std::string &Error) {
std::unique_ptr<SpecialCaseList> SCL(new SpecialCaseList());
if (SCL->createInternal(Paths, Error))
return SCL;
return nullptr;
}
std::unique_ptr<SpecialCaseList> SpecialCaseList::create(const MemoryBuffer *MB,
std::string &Error) {
std::unique_ptr<SpecialCaseList> SCL(new SpecialCaseList());
if (!SCL->parse(MB, Error))
return nullptr;
SCL->compile();
return SCL;
}
/*------------------------------------------------
结束总线
------------------------------------------------*/
void I2C_Stop(void)
{
SDA(0); //发送结束条件的数据信号
_delay_us(10); //发送结束条件的时钟信号
SCL(1); //结束条件建立时间大于4μ
_delay_us(10);
SDA(1); //发送I2C总线结束信号
_delay_us(10);
}
int CMP3::PlayMP3( const char *pszSong )
{
if( m_iIsPlaying )
{
// sound system is already initialized
SCL( m_Stream );
}
else
{
SOP( FSOUND_OUTPUT_DSOUND );
SBS( 200 );
SDRV( 0 );
INIT( 44100, 1, 0 ); // we need just one channel, multiple mp3s at a time would be, erm, strange...
}//AJH not for really cool effects, say walking past cars in a street playing different tunes, might change this later.
char song[256];
sprintf( song, "%s/%s", gEngfuncs.pfnGetGameDirectory(), pszSong);
//gEngfuncs.Con_Printf("Using fmod.dll version %f\n",VER());
if (SO)
{
m_Stream = SO( song, FSOUND_NORMAL | FSOUND_LOOP_NORMAL, 0 ,0); //AJH new version fmod uses Open
}
else if( SOF )
{
m_Stream = SOF( song, FSOUND_NORMAL | FSOUND_LOOP_NORMAL, 1 ); //AJH old version fmod OpenFile
}
if(m_Stream)
{
SPLAY( 0, m_Stream );
m_iIsPlaying = 1;
return 1;
}
else
{
m_iIsPlaying = 0;
gEngfuncs.Con_Printf("Error: Could not load %s\n",song);
return 0;
}
}
std::unique_ptr<SpecialCaseList>
SpecialCaseList::create(const std::vector<std::string> &Paths,
std::string &Error) {
std::unique_ptr<SpecialCaseList> SCL(new SpecialCaseList());
for (const auto &Path : Paths) {
ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
MemoryBuffer::getFile(Path);
if (std::error_code EC = FileOrErr.getError()) {
Error = (Twine("can't open file '") + Path + "': " + EC.message()).str();
return nullptr;
}
std::string ParseError;
if (!SCL->parse(FileOrErr.get().get(), ParseError)) {
Error = (Twine("error parsing file '") + Path + "': " + ParseError).str();
return nullptr;
}
}
SCL->compile();
return SCL;
}
int CMP3::StopMP3( void )
{
SCL( m_Stream );
m_iIsPlaying = 0;
return 1;
}
unsigned char read_SCL(void) // Set SCL as input and return current level of line, 0 or 1
{
SCL_IN();
return !!SCL();
}
