jens
a7a46940b5
git-svn-id: http://moon:8086/svn/projects/HendiControl@152 fda53097-d464-4ada-af97-ba876c37ca34
105 lines
1.5 KiB
C
105 lines
1.5 KiB
C
/*
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* uart.c
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*
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* Created: 20.02.2019 20:50:13
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* Author: jens
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*/
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#include <stdio.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include "uart.h"
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#include "message.h"
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static Fifo *g_pFifo = NULL;
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ISR(USART_UDRE_vect)
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{
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}
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ISR(USART_TX_vect)
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{
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}
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ISR(USART_RX_vect)
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{
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uint8_t status = UCSR0A;
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if (status & (1 << RXC0))
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{
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uint8_t rx_data = UDR0;
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Msg_t msg =
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{
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.code = Uart,
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.m.uart.data = rx_data
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};
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fifo_push(g_pFifo, &msg);
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}
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}
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void uart_init(Fifo *pFifo, uint32_t baudrate)
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{
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g_pFifo = pFifo;
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uint16_t prescale8 = UART_PRESCALE(baudrate, 8UL);
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uint16_t prescale16 = UART_PRESCALE(baudrate, 16UL);
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uint32_t baud8 = ((prescale8+1) * 8);
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uint32_t baud16 = ((prescale16+1) * 16);
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uint32_t err8 = abs(baudrate - baud8);
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uint32_t err16 = abs(baudrate - baud16);
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uint16_t prescale = prescale16;
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if (err8 < err16)
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{
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prescale = prescale8;
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// Double UART speed
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UCSR0A |= 1 << U2X0;
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}
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// Set baud rate
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UBRR0L = (uint8_t)prescale;
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UBRR0H = (uint8_t)(prescale >> 8);
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// Enable receiver and transmitter
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UCSR0B = (1<<TXEN0)|(1<<RXEN0);
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// Enable RX interrupt
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UCSR0B |= (1<<RXCIE0);
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}
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void uart_putc(char c)
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{
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while((UCSR0A & (1<<UDRE0)) == 0)
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{
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}
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UDR0 = c;
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}
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int uart_putchar(char c, FILE *stream)
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{
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uart_putc(c);
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if (c == 0x0A)
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{
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uart_putc(0x0D);
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}
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return 0;
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}
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void uart_puts(char const *str)
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{
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while(*str)
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{
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char c = *(str++);
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uart_putc(c);
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if (c == 0x0A)
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{
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uart_putc(0x0D);
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}
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}
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}
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