mirror of https://github.com/sanni/cartreader.git
119 lines
4.0 KiB
C++
119 lines
4.0 KiB
C++
/********************************************************************
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* Open Source Cartridge Reader for Arduino Mega 2560 */
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/*H******************************************************************
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* FILENAME : ClockedSerial.cpp
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*
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* DESCRIPTION :
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* Modified HardwareSerial class for using with a dynamic clock speed.
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*
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* PUBLIC FUNCTIONS :
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* void DynamicClockSerial::begin(baud, config, sclock)
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*
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* LICENSE :
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* CHANGES :
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*
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* REF NO VERSION DATE WHO DETAIL
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* 12.5 2023-03-29 Ancyker Initial version
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*
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*H*/
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#include "OSCR.h"
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#include "ClockedSerial.h"
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/*
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* This function is unchanged, including comments, from HardwareSerial. Comments not from
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* the original function are denoted with a prefix of "(ClockedSerial)".
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*
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* The parameter `sclock` is used to let it know the clockspeed. It replaces the usage of
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* the F_CPU preprocessor variable. Unlike `clock_prescale_set` this parameter is the
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* speed in MHz, i.e. 16000000 (16MHz).
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*/
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void DynamicClockSerial::begin(unsigned long baud, byte config, unsigned long sclock)
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{
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// Try u2x mode first
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uint16_t baud_setting = (sclock / 4 / baud - 1) / 2;
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*_ucsra = 1 << U2X0;
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// hardcoded exception for 57600 for compatibility with the bootloader
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// shipped with the Duemilanove and previous boards and the firmware
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// on the 8U2 on the Uno and Mega 2560. Also, The baud_setting cannot
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// be > 4095, so switch back to non-u2x mode if the baud rate is too
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// low.
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if (((sclock == 16000000UL) && (baud == 57600)) || (baud_setting > 4095)) /* (ClockedSerial) F_CPU -> sclock variable/parameter */
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{
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*_ucsra = 0;
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baud_setting = (sclock / 8 / baud - 1) / 2; /* (ClockedSerial) This is where we adjust things based on clock speed; F_CPU -> sclock variable/parameter */
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}
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// assign the baud_setting, a.k.a. ubrr (USART Baud Rate Register)
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*_ubrrh = baud_setting >> 8;
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*_ubrrl = baud_setting;
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_written = false;
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//set the data bits, parity, and stop bits
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#if defined(__AVR_ATmega8__)
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config |= 0x80; // select UCSRC register (shared with UBRRH)
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#endif
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*_ucsrc = config;
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sbi(*_ucsrb, RXEN0);
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sbi(*_ucsrb, TXEN0);
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sbi(*_ucsrb, RXCIE0);
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cbi(*_ucsrb, UDRIE0);
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}
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// ClockedSerial setup
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#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL) && !defined(ENABLE_SERIAL) && defined(ENABLE_UPDATER)
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#if defined(UBRRH) && defined(UBRRL)
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DynamicClockSerial ClockedSerial(&UBRRH, &UBRRL, &UCSRA, &UCSRB, &UCSRC, &UDR);
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#else
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DynamicClockSerial ClockedSerial(&UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &UCSR0C, &UDR0);
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#endif
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#if defined(USART_RX_vect)
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ISR(USART_RX_vect)
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#elif defined(USART0_RX_vect)
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ISR(USART0_RX_vect)
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#elif defined(USART_RXC_vect)
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ISR(USART_RXC_vect) // ATmega8
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#else
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#error "Don't know what the Data Received vector is called for Serial"
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#endif
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{
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ClockedSerial._rx_complete_irq();
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}
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#if defined(UART0_UDRE_vect)
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ISR(UART0_UDRE_vect)
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#elif defined(UART_UDRE_vect)
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ISR(UART_UDRE_vect)
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#elif defined(USART0_UDRE_vect)
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ISR(USART0_UDRE_vect)
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#elif defined(USART_UDRE_vect)
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ISR(USART_UDRE_vect)
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#else
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#error "Don't know what the Data Register Empty vector is called for Serial"
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#endif
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{
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ClockedSerial._tx_udr_empty_irq();
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}
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bool Serial0_available() {
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return ClockedSerial.available();
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}
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#endif
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