jens
feaf3666be
- fixed baudrate calculation [Bootloader] - set baudrate top 115200 [HendiCtrl] - set baudrate top 115200 - revised and fixed command interpreter - added new commands: SW_VERSION, SW_IDENTIFIER, DEBUG on/on, Remote enter, Remote exit - oven is switched off on entering / exiting remote git-svn-id: http://moon:8086/svn/projects/HendiControl@173 fda53097-d464-4ada-af97-ba876c37ca34
102 lines
1.5 KiB
C
102 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 <stdlib.h>
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#include <avr/io.h>
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#include "uart.h"
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void uart_init(uint32_t baudrate)
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{
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uint32_t prescale8 = UART_PRESCALE(baudrate, 8UL);
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uint32_t prescale16 = UART_PRESCALE(baudrate, 16UL);
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uint32_t fcpu8 = (prescale8 * baudrate * 8);
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uint32_t fcpu16 = (prescale16 * baudrate * 16);
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uint32_t err8 = abs(fcpu8 - F_CPU);
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uint32_t err16 = abs(fcpu16 - F_CPU);
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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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uint16_t reg = prescale - 1;
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UBRR0L = (uint8_t)reg;
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UBRR0H = (uint8_t)(reg >> 8);
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// Enable receiver and transmitter
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UCSR0B = (1<<TXEN0)|(1<<RXEN0);
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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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char uart_getc()
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{
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while ((UCSR0A & (1 << RXC0)) == 0)
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{
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}
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return UDR0;
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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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void print_byte(char byte)
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{
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int i;
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unsigned char c, nibble;
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for (i=0; i < 2; i++)
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{
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nibble = (char)((byte >> 4) & 0xF);
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byte <<= 4;
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if (nibble < 10)
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c = nibble + '0';
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else
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c = nibble + 'A' - 10;
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uart_putc(c);
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}
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}
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void print_word(uint16_t word)
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{
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int i;
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unsigned char c;
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for (i=0; i < 2; i++)
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{
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c = (char) (word >> 8);
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print_byte(c);
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word <<= 8;
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}
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}
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