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134 lines
3.7 KiB
134 lines
3.7 KiB
/*
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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 ssd1306_uart.h Uart implementation for SSD1306 library
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* @details Define UART_INTERRUPT_ENABLE before including this header, if you
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* want interrupt-based UART support.
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* Define CONFIG_AVR_UART_AVAILABLE and CONFIG_AVR_UART_ENABLE before
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* including this header, if you want to use uart module outside ssd1306 library.
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*/
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#ifndef _SSD1306_UART_H_
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#define _SSD1306_UART_H_
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// This check is required if you want to use ssd1306_uart module outside ssd1306_library
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#ifndef CONFIG_AVR_UART_AVAILABLE
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#include "ssd1306_hal/io.h"
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#endif
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#if defined(CONFIG_AVR_UART_AVAILABLE) && defined(CONFIG_AVR_UART_ENABLE)
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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/** Rx buffer size, used by AVR USART implementation */
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#define UART_BUFFER_RX 32 // :( Still need large buffer to process USART RX bytes
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#ifndef DOXYGEN_SHOULD_SKIP_THIS
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extern volatile uint8_t g_uart_put_ptr;
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extern volatile uint8_t g_uart_buf[];
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void uart_init_internal(uint32_t baud, uint8_t interrupt);
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#endif
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/**
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* @brief Initializes uart module
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*
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* Initializes uart module. Depending on UART_INTERRUPT_ENABLE define,
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* module will be initialized in interrupt mode or synchronouse mode.
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*
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* @param baud baud rate for the uart module
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* @note only 115200, 57600, 38400 and 19200 are supported.
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*/
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static inline void uart_init(uint32_t baud)
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{
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#ifdef UART_INTERRUPT_ENABLE
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uart_init_internal(baud, 1);
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#else
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uart_init_internal(baud, 0);
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#endif
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}
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/**
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* @brief Sends single byte over UART
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*
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* Sends single byte over UART. The function doesn't use any
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* internal buffers, so it returns control once byte is sent.
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*
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* @param c byte to send.
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*/
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void uart_send_byte(uint8_t c);
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/**
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* @brief Returns non-zero code if there are bytes in RX buffer
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*
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* Returns non-zero code if there are bytes in RX buffer
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*/
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uint8_t uart_byte_available(void);
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/**
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* @brief Reads byte from UART RX buffer.
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*
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* Reads byte from UART RX buffer. Please, check bytes availability
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* via uart_byte_available() before calling this function.
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*/
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uint8_t uart_read_byte(void);
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#ifndef DOXYGEN_SHOULD_SKIP_THIS
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static inline void __uart_read_byte(void)
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{
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g_uart_buf[g_uart_put_ptr] = UDR0;
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g_uart_put_ptr = (g_uart_put_ptr+1) & (UART_BUFFER_RX - 1);
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}
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#ifdef UART_INTERRUPT_ENABLE
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ISR(USART_RX_vect, ISR_BLOCK)
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{
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if (bit_is_clear(UCSR0A, FE0)) // Do not perform error checks for now
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{
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__uart_read_byte();
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}
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else
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{
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volatile unsigned char data __attribute__((unused)) = UDR0;
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}
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}
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#endif
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#endif // DOXYGEN_SHOULD_SKIP_THIS
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#ifdef __cplusplus
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}
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#endif
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#endif
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#endif
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