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/*
HardwareSerial.cpp - Hardware serial library for Wiring
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Modified 23 November 2006 by David A. Mellis
Modified 28 September 2010 by Mark Sproul
*/
#include "Marlin.h"
#include "MarlinSerial.h"
int selectedSerialPort = 0;
#ifndef AT90USB
// this next line disables the entire HardwareSerial.cpp,
// this is so I can support Attiny series and any other chip without a UART
#if defined(UBRRH) || defined(UBRR0H) || defined(UBRR1H) || defined(UBRR2H) || defined(UBRR3H)
#if UART_PRESENT(SERIAL_PORT)
ring_buffer rx_buffer = { { 0 }, 0, 0 };
#endif
FORCE_INLINE void store_char(unsigned char c)
{
int i = (unsigned int)(rx_buffer.head + 1) % RX_BUFFER_SIZE;
// if we should be storing the received character into the location
// just before the tail (meaning that the head would advance to the
// current location of the tail), we're about to overflow the buffer
// and so we don't write the character or advance the head.
if (i != rx_buffer.tail) {
rx_buffer.buffer[rx_buffer.head] = c;
rx_buffer.head = i;
}
}
//#elif defined(SIG_USART_RECV)
#if defined(M_USARTx_RX_vect)
// fixed by Mark Sproul this is on the 644/644p
//SIGNAL(SIG_USART_RECV)
SIGNAL(M_USARTx_RX_vect)
{
// Test for a framing error.
if (M_UCSRxA & (1<<M_FEx)) {
// Characters received with the framing errors will be ignored.
// The temporary variable "c" was made volatile, so the compiler does not optimize this out.
volatile unsigned char c = M_UDRx;
} else {
// Read the input register.
unsigned char c = M_UDRx;
store_char(c);
}
}
SIGNAL(USART2_RX_vect)
{
if (selectedSerialPort == 1) {
// Test for a framing error.
if (UCSR2A & (1<<FE2)) {
// Characters received with the framing errors will be ignored.
// The temporary variable "c" was made volatile, so the compiler does not optimize this out.
volatile unsigned char c = UDR2;
} else {
// Read the input register.
unsigned char c = UDR2;
store_char(c);
}
}
}
#endif
// Constructors ////////////////////////////////////////////////////////////////
MarlinSerial::MarlinSerial()
{
}
// Public Methods //////////////////////////////////////////////////////////////
void MarlinSerial::begin(long baud)
{
uint16_t baud_setting;
bool useU2X = true;
#if F_CPU == 16000000UL && SERIAL_PORT == 0
// hard-coded exception for compatibility with the bootloader shipped
// with the Duemilanove and previous boards and the firmware on the 8U2
// on the Uno and Mega 2560.
if (baud == 57600) {
useU2X = false;
}
#endif
// set up the first (original serial port)
if (useU2X) {
M_UCSRxA = 1 << M_U2Xx;
baud_setting = (F_CPU / 4 / baud - 1) / 2;
} else {
M_UCSRxA = 0;
baud_setting = (F_CPU / 8 / baud - 1) / 2;
}
// assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
M_UBRRxH = baud_setting >> 8;
M_UBRRxL = baud_setting;
sbi(M_UCSRxB, M_RXENx);
sbi(M_UCSRxB, M_TXENx);
sbi(M_UCSRxB, M_RXCIEx);
// set up the second serial port
if (useU2X) {
UCSR2A = 1 << U2X2;
baud_setting = (F_CPU / 4 / baud - 1) / 2;
} else {
UCSR2A = 0;
baud_setting = (F_CPU / 8 / baud - 1) / 2;
}
// assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
UBRR2H = baud_setting >> 8;
UBRR2L = baud_setting;
sbi(UCSR2B, RXEN2);
sbi(UCSR2B, TXEN2);
sbi(UCSR2B, RXCIE2);
}
void MarlinSerial::end()
{
cbi(M_UCSRxB, M_RXENx);
cbi(M_UCSRxB, M_TXENx);
cbi(M_UCSRxB, M_RXCIEx);
cbi(UCSR2B, RXEN2);
cbi(UCSR2B, TXEN2);
cbi(UCSR2B, RXCIE2);
}
int MarlinSerial::peek(void)
{
if (rx_buffer.head == rx_buffer.tail) {
return -1;
} else {
return rx_buffer.buffer[rx_buffer.tail];
}
}
int MarlinSerial::read(void)
{
// if the head isn't ahead of the tail, we don't have any characters
if (rx_buffer.head == rx_buffer.tail) {
return -1;
} else {
unsigned char c = rx_buffer.buffer[rx_buffer.tail];
rx_buffer.tail = (unsigned int)(rx_buffer.tail + 1) % RX_BUFFER_SIZE;
return c;
}
}
void MarlinSerial::flush()
{
// don't reverse this or there may be problems if the RX interrupt
// occurs after reading the value of rx_buffer_head but before writing
// the value to rx_buffer_tail; the previous value of rx_buffer_head
// may be written to rx_buffer_tail, making it appear as if the buffer
// don't reverse this or there may be problems if the RX interrupt
// occurs after reading the value of rx_buffer_head but before writing
// the value to rx_buffer_tail; the previous value of rx_buffer_head
// may be written to rx_buffer_tail, making it appear as if the buffer
// were full, not empty.
rx_buffer.head = rx_buffer.tail;
}
/// imports from print.h
void MarlinSerial::print(char c, int base)
{
print((long) c, base);
}
void MarlinSerial::print(unsigned char b, int base)
{
print((unsigned long) b, base);
}
void MarlinSerial::print(int n, int base)
{
print((long) n, base);
}
void MarlinSerial::print(unsigned int n, int base)
{
print((unsigned long) n, base);
}
void MarlinSerial::print(long n, int base)
{
if (base == 0) {
write(n);
} else if (base == 10) {
if (n < 0) {
print('-');
n = -n;
}
printNumber(n, 10);
} else {
printNumber(n, base);
}
}
void MarlinSerial::print(unsigned long n, int base)
{
if (base == 0) write(n);
else printNumber(n, base);
}
void MarlinSerial::print(double n, int digits)
{
printFloat(n, digits);
}
void MarlinSerial::println(void)
{
print('\r');
print('\n');
}
void MarlinSerial::println(const String &s)
{
print(s);
println();
}
void MarlinSerial::println(const char c[])
{
print(c);
println();
}
void MarlinSerial::println(char c, int base)
{
print(c, base);
println();
}
void MarlinSerial::println(unsigned char b, int base)
{
print(b, base);
println();
}
void MarlinSerial::println(int n, int base)
{
print(n, base);
println();
}
void MarlinSerial::println(unsigned int n, int base)
{
print(n, base);
println();
}
void MarlinSerial::println(long n, int base)
{
print(n, base);
println();
}
void MarlinSerial::println(unsigned long n, int base)
{
print(n, base);
println();
}
void MarlinSerial::println(double n, int digits)
{
print(n, digits);
println();
}
// Private Methods /////////////////////////////////////////////////////////////
void MarlinSerial::printNumber(unsigned long n, uint8_t base)
{
unsigned char buf[8 * sizeof(long)]; // Assumes 8-bit chars.
unsigned long i = 0;
if (n == 0) {
print('0');
return;
}
while (n > 0) {
buf[i++] = n % base;
n /= base;
}
for (; i > 0; i--)
print((char) (buf[i - 1] < 10 ?
'0' + buf[i - 1] :
'A' + buf[i - 1] - 10));
}
void MarlinSerial::printFloat(double number, uint8_t digits)
{
// Handle negative numbers
if (number < 0.0)
{
print('-');
number = -number;
}
// Round correctly so that print(1.999, 2) prints as "2.00"
double rounding = 0.5;
for (uint8_t i=0; i<digits; ++i)
rounding /= 10.0;
number += rounding;
// Extract the integer part of the number and print it
unsigned long int_part = (unsigned long)number;
double remainder = number - (double)int_part;
print(int_part);
// Print the decimal point, but only if there are digits beyond
if (digits > 0)
print(".");
// Extract digits from the remainder one at a time
while (digits-- > 0)
{
remainder *= 10.0;
int toPrint = int(remainder);
print(toPrint);
remainder -= toPrint;
}
}
// Preinstantiate Objects //////////////////////////////////////////////////////
MarlinSerial MSerial;
#endif // whole file
#endif // !AT90USB
// For AT90USB targets use the UART for BT interfacing
#if defined(AT90USB) && defined (BTENABLED)
HardwareSerial bt;
#endif
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