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88 lines
1.8 KiB
88 lines
1.8 KiB
#pragma once
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//
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// Utilities for UART communication.
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//
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// First, init uart with desired baud rate using uart_init(baud).
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// Then enable interrupts you want with uart_isr_XXX().
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//
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <util/delay.h>
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#include <stdbool.h>
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#include <stdint.h>
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/** Init UART for given baudrate */
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void _uart_init_do(uint16_t ubrr); // internal, needed for the macro.
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#define uart_init(baud) _uart_init_do(F_CPU / 16 / (baud) - 1)
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/** Check if there's a byte in the RX register */
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#define uart_rx_ready() (0 != (UCSR0A & (1 << RXC0)))
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/** Check if transmission of everything is done */
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#define uart_tx_ready() (0 != (UCSR0A & (1 << UDRE0)))
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// Enable UART interrupts
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/** Enable or disable RX ISR */
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void uart_isr_rx(bool enable);
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/** Enable or disable TX ISR (1 byte is sent) */
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void uart_isr_tx(bool enable);
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/** Enable or disable DRE ISR (all is sent) */
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void uart_isr_dre(bool enable);
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// Basic IO
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/** Receive one byte over UART */
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uint8_t uart_rx();
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/** Send byte over UART */
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#define uart_putc(data) uart_tx((data))
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void uart_tx(uint8_t data);
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/** Clear receive buffer */
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void uart_flush();
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// Strings
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/** Send string over UART */
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void uart_puts(const char* str);
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/** Send progmem string over UART */
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void uart_puts_pgm(const char* str);
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// Numbers
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/** Send unsigned int */
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void uart_putn(const int8_t num);
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/** Send signed int */
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void uart_putu(const uint8_t num);
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/** Send unsigned int */
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void uart_puti(const int16_t num, const uint8_t places);
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/** Send signed int */
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void uart_putiu(const uint16_t num, const uint8_t places);
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/** Send unsigned long */
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void uart_putlu(const uint32_t num, const uint8_t places);
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/** Send signed long */
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void uart_putl(const int32_t num, const uint8_t places);
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// Extras
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/** Send CRLF */
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void uart_nl();
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