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cf475a9a39
Define unique register aliases for all of the hardware serial port definitions. This makes it easier to deal with the AVR chips that use different register names. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
// AVR serial port code.
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//
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// Copyright (C) 2016-2018 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include <avr/interrupt.h> // USART_RX_vect
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#include "autoconf.h" // CONFIG_SERIAL_BAUD
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#include "board/serial_irq.h" // serial_rx_byte
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#include "sched.h" // DECL_INIT
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// Helper macros for defining serial port aliases
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#define AVR_SERIAL_REG1(prefix, id, suffix) prefix ## id ## suffix
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#define AVR_SERIAL_REG(prefix, id, suffix) AVR_SERIAL_REG1(prefix, id, suffix)
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// Serial port register aliases
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#define UCSRxA AVR_SERIAL_REG(UCSR, CONFIG_SERIAL_PORT, A)
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#define UCSRxB AVR_SERIAL_REG(UCSR, CONFIG_SERIAL_PORT, B)
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#define UCSRxC AVR_SERIAL_REG(UCSR, CONFIG_SERIAL_PORT, C)
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#define UBRRx AVR_SERIAL_REG(UBRR, CONFIG_SERIAL_PORT,)
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#define UDRx AVR_SERIAL_REG(UDR, CONFIG_SERIAL_PORT,)
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#define UCSZx1 AVR_SERIAL_REG(UCSZ, CONFIG_SERIAL_PORT, 1)
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#define UCSZx0 AVR_SERIAL_REG(UCSZ, CONFIG_SERIAL_PORT, 0)
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#define U2Xx AVR_SERIAL_REG(U2X, CONFIG_SERIAL_PORT,)
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#define RXENx AVR_SERIAL_REG(RXEN, CONFIG_SERIAL_PORT,)
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#define TXENx AVR_SERIAL_REG(TXEN, CONFIG_SERIAL_PORT,)
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#define RXCIEx AVR_SERIAL_REG(RXCIE, CONFIG_SERIAL_PORT,)
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#define UDRIEx AVR_SERIAL_REG(UDRIE, CONFIG_SERIAL_PORT,)
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#if defined(USART_RX_vect)
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// The atmega168 / atmega328 doesn't have an ID in the irq names
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#define USARTx_RX_vect USART_RX_vect
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#define USARTx_UDRE_vect USART_UDRE_vect
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#else
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#define USARTx_RX_vect AVR_SERIAL_REG(USART, CONFIG_SERIAL_PORT, _RX_vect)
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#define USARTx_UDRE_vect AVR_SERIAL_REG(USART, CONFIG_SERIAL_PORT, _UDRE_vect)
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#endif
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void
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serial_init(void)
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{
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UCSRxA = CONFIG_SERIAL_BAUD_U2X ? (1<<U2Xx) : 0;
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uint32_t cm = CONFIG_SERIAL_BAUD_U2X ? 8 : 16;
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UBRRx = DIV_ROUND_CLOSEST(CONFIG_CLOCK_FREQ, cm * CONFIG_SERIAL_BAUD) - 1UL;
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UCSRxC = (1<<UCSZx1) | (1<<UCSZx0);
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UCSRxB = (1<<RXENx) | (1<<TXENx) | (1<<RXCIEx) | (1<<UDRIEx);
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}
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DECL_INIT(serial_init);
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// Rx interrupt - data available to be read.
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ISR(USARTx_RX_vect)
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{
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serial_rx_byte(UDRx);
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}
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// Tx interrupt - data can be written to serial.
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ISR(USARTx_UDRE_vect)
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{
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uint8_t data;
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int ret = serial_get_tx_byte(&data);
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if (ret)
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UCSRxB &= ~(1<<UDRIEx);
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else
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UDRx = data;
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}
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// Enable tx interrupts
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void
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serial_enable_tx_irq(void)
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{
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UCSRxB |= 1<<UDRIEx;
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}
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