/*************************************************************************
Function Name : UartInit
Arguments : baud: baud rate(2400-1M bps)
charSize: character size(5-8)
parity: parity mode(0-None, 1-Reserved, 2-Even£¬3-Odd)
stopbit: size of stop bits (1-2)
frmSpace: setting value of min space time between frame
unit: 0.1ms
Return : TRUE-Initialization success
FALSE-Initialization failed (invalid input)
Description : UART initialization
**************************************************************************/
uint8 UartInit(uint32 baud, uint8 charSize, uint8 parity, uint8 stopbit, uint16 frmSpace)
{
uint16 ubrrValue;
//parameter check
if ((baud < BAUD_MIN) || (baud > BAUD_MAX) || (charSize < 5) || (charSize > 8)
|| (parity > 3) || (stopbit < 1) || (stopbit > 2))
{
return FALSE;
}
UartIOSet();
/* UBRR = Fosc / (16 * BAUD) - 1
Note: MSB of ubrrValue must be 0, because UBRRH Register shares the
same I/O location as the UCSRC Register. So, the URSEL bit must used
to distinguish them.
*///ubrrValue = (F_CPU / 16 / baud) - 1;
ubrrValue = RoundDiv(F_CPU/16, baud) - 1;
UBRR0H = ubrrValue >> 8;
UBRR0L = ubrrValue;
/* Update USART Control & Status Reg C "UCSRC"
URSEL - 1 (UCSRC Access)
UMSEL - 0 (Asynchronous Mode)
UPM1 - 1 (Even Parity)
UPM0 - 0 (Even Parity)
USBS - 0 (1 Stop bit)
UCSZ1 - 1 (8 bit Character Size)
UCSZ0 - 1 (8 bit Character Size)
UCPOL - 0 (clock polarity) */
/* Note: (1<<URSEL) must be in forefront */
UCSR0C = ((parity<<UPM0) | ((stopbit-1)<<USBS) | ((charSize-5)<<UCSZ0));
/* Update USART Control & Status Reg B "UCSRB"
RXCIE - 1 (RX Complete Interrupt Enable)
TXCIE - 0 (TX Complete Interrupt Enable)
UDRIE - 0 (UDR Empty Interrupt Enable)
RXEN - 1 (Enable Reciver)
TXEN - 1 (Enable Transmitter)
UCSZ2 - 0 (8 Character Size)
RXB8 - 0 (Receive Data Bit 8)
TXB8 - 0 (Transmit Data Bit 8) */
UCSR0B = ((1<<RXEN) | (1<<TXEN) | (1<<RXCIE));
UartFlush();
UartSwitchToRx();
if (UartRxBufSet(buf1, BUF_SIZE1) == FALSE)
return FALSE;
if (UartTxBufSet(buf2, BUF_SIZE2) == FALSE)
return FALSE;
txCtrl.frmSpaceSet = frmSpace;
return TRUE;
}
std::string DecimalStr(const BigRat& q, const MachineInt& DecimalPlaces)
{
if (IsNegative(DecimalPlaces) || !IsSignedLong(DecimalPlaces) || IsZero(DecimalPlaces))
CoCoA_ERROR(ERR::BadArg, "FixedStr");
if (IsOneDen(q)) return DecimalStr(num(q), DecimalPlaces);
const long DigitsAfterPoint = AsSignedLong(DecimalPlaces);
const BigInt N = RoundDiv(abs(num(q))*power(10,DigitsAfterPoint),den(q));
string digits = ToString(N);
if (len(digits) < 1+DigitsAfterPoint)
{
digits = string(DigitsAfterPoint+1-len(digits), '0') + digits;
}
string ans;
if (q < 0) ans = '-';
const long IntegerPart = len(digits) - DigitsAfterPoint;
ans.insert(ans.end(), &digits[0], &digits[IntegerPart]);
ans += '.';
ans.insert(ans.end(), &digits[IntegerPart], &digits[IntegerPart+DigitsAfterPoint]);
return ans;
}
