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/********************************************************************
* Open Source Cartridge Reader for Arduino Mega 2560 */
/*H******************************************************************
* FILENAME : ClockedSerial.cpp
*
* DESCRIPTION :
* Modified HardwareSerial class for using with a dynamic clock speed.
*
* PUBLIC FUNCTIONS :
* void DynamicClockSerial::begin(baud, config, sclock)
*
* LICENSE :
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* CHANGES :
*
* REF NO VERSION DATE WHO DETAIL
* 12.5 2023-03-29 Ancyker Initial version
*
*H*/
#include "OSCR.h"
#include "ClockedSerial.h"
/*
* This function is unchanged, including comments, from HardwareSerial. Comments not from
* the original function are denoted with a prefix of "(ClockedSerial)".
*
* The parameter `sclock` is used to let it know the clockspeed. It replaces the usage of
* the F_CPU preprocessor variable. Unlike `clock_prescale_set` this parameter is the
* speed in MHz, i.e. 16000000 (16MHz).
*/
void DynamicClockSerial::begin(unsigned long baud, byte config, unsigned long sclock)
{
// Try u2x mode first
uint16_t baud_setting = (sclock / 4 / baud - 1) / 2;
*_ucsra = 1 << U2X0;
// hardcoded exception for 57600 for compatibility with the bootloader
// shipped with the Duemilanove and previous boards and the firmware
// on the 8U2 on the Uno and Mega 2560. Also, The baud_setting cannot
// be > 4095, so switch back to non-u2x mode if the baud rate is too
// low.
if (((sclock == 16000000UL) && (baud == 57600)) || (baud_setting > 4095)) /* (ClockedSerial) F_CPU -> sclock variable/parameter */
{
*_ucsra = 0;
baud_setting = (sclock / 8 / baud - 1) / 2; /* (ClockedSerial) This is where we adjust things based on clock speed; F_CPU -> sclock variable/parameter */
}
// assign the baud_setting, a.k.a. ubrr (USART Baud Rate Register)
*_ubrrh = baud_setting >> 8;
*_ubrrl = baud_setting;
_written = false;
//set the data bits, parity, and stop bits
#if defined(__AVR_ATmega8__)
config |= 0x80; // select UCSRC register (shared with UBRRH)
#endif
*_ucsrc = config;
sbi(*_ucsrb, RXEN0);
sbi(*_ucsrb, TXEN0);
sbi(*_ucsrb, RXCIE0);
cbi(*_ucsrb, UDRIE0);
}
// ClockedSerial setup
#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL) && !defined(ENABLE_SERIAL) && defined(ENABLE_UPDATER)
#if defined(UBRRH) && defined(UBRRL)
DynamicClockSerial ClockedSerial(&UBRRH, &UBRRL, &UCSRA, &UCSRB, &UCSRC, &UDR);
#else
DynamicClockSerial ClockedSerial(&UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &UCSR0C, &UDR0);
#endif
#if defined(USART_RX_vect)
ISR(USART_RX_vect)
#elif defined(USART0_RX_vect)
ISR(USART0_RX_vect)
#elif defined(USART_RXC_vect)
ISR(USART_RXC_vect) // ATmega8
#else
#error "Don't know what the Data Received vector is called for Serial"
#endif
{
ClockedSerial._rx_complete_irq();
}
#if defined(UART0_UDRE_vect)
ISR(UART0_UDRE_vect)
#elif defined(UART_UDRE_vect)
ISR(UART_UDRE_vect)
#elif defined(USART0_UDRE_vect)
ISR(USART0_UDRE_vect)
#elif defined(USART_UDRE_vect)
ISR(USART_UDRE_vect)
#else
#error "Don't know what the Data Register Empty vector is called for Serial"
#endif
{
ClockedSerial._tx_udr_empty_irq();
}
bool Serial0_available() {
return ClockedSerial.available();
}
#endif
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