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146 lines
4.3 KiB
146 lines
4.3 KiB
2 years ago
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/*
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MIT License
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Copyright (c) 2018, Alexey Dynda
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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/**
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* @file nano_engine.h Small graphics engine, based on SSD1331 functions
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*/
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#include "ssd1306_uart.h"
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#if defined(CONFIG_AVR_UART_AVAILABLE) && defined(CONFIG_AVR_UART_ENABLE)
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volatile uint8_t g_uart_put_ptr = 0;
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volatile uint8_t g_uart_buf[UART_BUFFER_RX];
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static uint8_t s_uart_get_ptr = 0;
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static uint8_t s_uart_interrupt = 0;
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#undef BAUD
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#define BAUD 115200
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// We need to define BAUD_TOL too high, because otherwise,
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// the compiler will give a warning "Baud rate achieved is higher than allowed"
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// I would recommend not to use 115200 on atmega328p
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#define BAUD_TOL 4
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#include <util/setbaud.h>
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static const uint8_t ubrr0h_115200 = UBRRH_VALUE;
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static const uint8_t ubrr0l_115200 = UBRRL_VALUE;
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#ifdef USE_2X
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static const uint8_t u2x0_115200 = 1;
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#else
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static const uint8_t u2x0_115200 = 0;
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#endif
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#undef BAUD
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#define BAUD 57600
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#include <util/setbaud.h>
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static const uint8_t ubrr0h_57600 = UBRRH_VALUE;
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static const uint8_t ubrr0l_57600 = UBRRL_VALUE;
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#ifdef USE_2X
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static const uint8_t u2x0_57600 = 1;
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#else
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static const uint8_t u2x0_57600 = 0;
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#endif
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#undef BAUD
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#define BAUD 38400
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#include <util/setbaud.h>
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static const uint8_t ubrr0h_38400 = UBRRH_VALUE;
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static const uint8_t ubrr0l_38400 = UBRRL_VALUE;
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#ifdef USE_2X
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static const uint8_t u2x0_38400 = 1;
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#else
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static const uint8_t u2x0_38400 = 0;
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#endif
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#undef BAUD
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#define BAUD 19200
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#include <util/setbaud.h>
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static const uint8_t ubrr0h_19200 = UBRRH_VALUE;
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static const uint8_t ubrr0l_19200 = UBRRL_VALUE;
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#ifdef USE_2X
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static const uint8_t u2x0_19200 = 1;
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#else
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static const uint8_t u2x0_19200 = 0;
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#endif
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void uart_init_internal(uint32_t baud, uint8_t interrupt)
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{
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s_uart_interrupt = interrupt;
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switch (baud)
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{
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case 19200:
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UBRR0H = ubrr0h_19200;
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UBRR0L = ubrr0l_19200;
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if (u2x0_19200) UCSR0A |= _BV(U2X0); else UCSR0A &= ~(_BV(U2X0));
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break;
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case 38400:
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UBRR0H = ubrr0h_38400;
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UBRR0L = ubrr0l_38400;
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if (u2x0_38400) UCSR0A |= _BV(U2X0); else UCSR0A &= ~(_BV(U2X0));
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break;
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case 57600:
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UBRR0H = ubrr0h_57600;
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UBRR0L = ubrr0l_57600;
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if (u2x0_57600) UCSR0A |= _BV(U2X0); else UCSR0A &= ~(_BV(U2X0));
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break;
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case 115200:
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UBRR0H = ubrr0h_115200;
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UBRR0L = ubrr0l_115200;
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if (u2x0_115200) UCSR0A |= _BV(U2X0); else UCSR0A &= ~(_BV(U2X0));
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break;
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default:
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break;
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}
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UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); /* 8-bit data */
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UCSR0B = _BV(RXEN0) | _BV(TXEN0) | (s_uart_interrupt ? _BV(RXCIE0) : 0);
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}
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void uart_send_byte(uint8_t c)
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{
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loop_until_bit_is_set(UCSR0A, UDRE0); /* Wait until data register empty. */
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UDR0 = c;
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}
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static inline uint8_t uart_byte_available_direct(void)
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{
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return bit_is_set(UCSR0A, RXC0);
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}
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uint8_t uart_byte_available(void)
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{
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if (!s_uart_interrupt)
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{
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while (uart_byte_available_direct()) __uart_read_byte();
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}
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return g_uart_put_ptr != s_uart_get_ptr;
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}
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uint8_t uart_read_byte(void)
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{
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uint8_t data = g_uart_buf[s_uart_get_ptr];
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s_uart_get_ptr = (s_uart_get_ptr + 1) & (UART_BUFFER_RX - 1);
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return data;
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}
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#endif
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