80 lines
1.8 KiB
C++
80 lines
1.8 KiB
C++
#ifndef USART_H
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#define USART_H
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#include <avr/io.h>
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#include <util/delay.h>
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#include <stdint.h>
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#include <avr/interrupt.h>
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class USART;
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#include "global_vars.h"
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#include "requests.h"
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enum BlockSequence
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{
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IDLE = 0,
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LEN = 1,
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DATA = 2,
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CRC = 3,
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END = 4,
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};
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class USART
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{
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public:
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// Steuerung
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void init(void) volatile;
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void clearInputBuffer(void) volatile;
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void initRX(void) volatile;
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void initTX(void) volatile;
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void handleRX(void) volatile;
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void handleTX(void) volatile;
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void flush(void) volatile;
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// Sendefunktionen
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void writeByte(uint8_t) volatile;
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void writeInt(uint16_t) volatile;
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void writeStr(const char*, uint8_t) volatile;
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void writeCRC(void) volatile;
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// Empfangsfunktionen
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uint8_t readByte(void) volatile;
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uint16_t readInt(void) volatile;
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// Blockgedöns
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void nextByte(uint8_t byte) volatile;
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uint8_t writeBlock(uint8_t*, uint8_t) volatile;
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void readBlock(uint8_t*, uint8_t) volatile;
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uint8_t block_pos = 0;
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// constants
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constexpr static uint8_t MSG_OK = 0xFF;
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constexpr static uint8_t MSG_FAIL = 0xFE;
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constexpr static uint32_t BAUDRATE = 115200; // 38400
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constexpr static uint8_t CRC7_POLY = 0x91;
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constexpr static uint8_t MAX_BLOCK_SIZE = 64;
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constexpr static uint8_t BLOCK_END = 0x80;
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constexpr static uint16_t US_PER_BIT = 1000000 / BAUDRATE;
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private:
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uint8_t block_buffer[MAX_BLOCK_SIZE + 3]; // don't store BLOCK_END byte
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uint8_t crc;
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volatile BlockSequence seq = BlockSequence::IDLE;
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volatile uint8_t receive_buffer[128];
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volatile uint8_t receive_pos;
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volatile uint8_t send_buffer[128];
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volatile uint8_t send_pos;
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volatile uint8_t send_len;
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volatile uint8_t send_crc;
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volatile bool send_active;
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};
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#endif // USART_H
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