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87 lines
1.7 KiB
87 lines
1.7 KiB
8 years ago
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#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 usart_init().
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// Then enable interrupts you want with usart_XXX_isr_enable().
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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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#include "calc.h"
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/* USART BAUD RATE REGISTER values at 16 MHz */
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enum {
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BAUD_9600 = 103,
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BAUD_14400 = 68,
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BAUD_19200 = 51,
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BAUD_28800 = 34,
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BAUD_38400 = 25,
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BAUD_57600 = 16,
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BAUD_76800 = 12,
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BAUD_115200 = 8,
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BAUD_250k = 3,
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BAUD_500k = 1,
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BAUD_1M = 0,
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};
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/** Init UART with a UBRR value - can use the BAUD_* constants for 16 MHz */
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void usart_init(uint16_t ubrr);
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/** Set Double Speed Asynchronous mode on or off */
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void usart_set_2x(bool set);
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/** Check if there's a byte in the RX register */
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#define usart_rx_ready() bit_is_high(UCSR0A, RXC0)
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/** Check if USART is ready to accept new byte to send */
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#define usart_tx_ready() bit_is_high(UCSR0A, UDRE0)
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// ---- Enable UART interrupts ------------
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/** Enable or disable RX ISR */
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#define usart_isr_rx_enable(yes) set_bit(UCSR0B, RXCIE0, (yes))
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/** Enable or disable TX ISR (all data sent) */
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#define usart_isr_tx_enable(yes) set_bit(UCSR0B, TXCIE0, (yes))
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/** Enable or disable DRE ISR (data register empty) */
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#define usart_isr_dre_enable(yes) set_bit(UCSR0B, UDRIE0, (yes))
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// ---- Basic IO --------------------------
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/** Send byte over USART */
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void usart_tx(uint8_t data);
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/** Receive one byte over USART */
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uint8_t usart_rx(void);
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/** Clear receive buffer */
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void usart_flush_rx(void);
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// ---- Strings ---------------------------
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/** Send string over UART */
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void usart_puts(const char* str);
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/** Send progmem string `PSTR("foobar")` over UART */
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void usart_puts_P(const char* str);
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