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/**
*
* Author: Dylan Muller
* Copyright (c) 2025
* All rights reserved.
*
* - Commercial/IP use prohibited.
* - Attribution required.
* See License.txt
*
*/
#include "setup.h"
#include "peripheral/ring.h"
#include "peripheral/uart.h"
#include "status.h"
#include "cmd.h"
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/atomic.h>
#include <util/setbaud.h>
extern t_system_status system_status;
static int uart_putc(
char c,
FILE *stream
)
{
(void)stream;
if(uart_tx(c))
return _FDEV_EOF;
return c;
}
static int uart_getc(
FILE *stream
)
{
uint8_t c;
(void)stream;
if(uart_rx(&c))
return _FDEV_EOF;
return c;
}
FILE uart_out = FDEV_SETUP_STREAM(uart_putc, NULL, _FDEV_SETUP_WRITE);
FILE uart_in = FDEV_SETUP_STREAM(NULL, uart_getc, _FDEV_SETUP_READ);
static volatile ring_t uart_tx_ring;
static volatile ring_t uart_rx_ring;
static volatile uint8_t uart_tx_buf[UART_BUF_SIZE];
static volatile uint8_t uart_rx_buf[UART_BUF_SIZE];
void uart_init(void)
{
uart_tx_ring = ring_init((uint8_t*)uart_tx_buf, UART_BUF_SIZE - 1);
uart_rx_ring = ring_init((uint8_t*)uart_rx_buf, UART_BUF_SIZE - 1);
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
UCSR0B |= (1 << RXCIE0) | (1 << RXEN0) | (1 << TXEN0);
UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
stdout = &uart_out;
stdin = &uart_in;
}
bool uart_tx(
uint8_t data
)
{
bool ret;
while(ring_is_full(uart_tx_ring));
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
ret = ring_push((ring_t*)&uart_tx_ring, data);
}
if(!ret)
UCSR0B |= (1 << UDRIE0);
return ret;
}
bool uart_rx(
uint8_t* data
)
{
bool ret;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
ret = ring_pop((ring_t*)&uart_rx_ring, data);
}
return ret;
}
size_t uart_tx_burst(
uint8_t *data,
size_t size
)
{
size_t i = 0;
while(i<size && !uart_tx(*data++))
i++;
return i;
}
size_t uart_rx_burst(
uint8_t* data,
size_t len
)
{
size_t i = 0;
while(i<len && !uart_rx(data++))
i++;
return i;
}
size_t uart_tx_available(void)
{
size_t ret;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
ret = ring_push_available(uart_tx_ring);
}
return ret;
}
size_t uart_rx_available(void)
{
size_t ret;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
ret = ring_pop_available(uart_rx_ring);
}
return ret;
}
bool uart_rx_peek(
uint8_t *data
)
{
bool ret;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
ret = ring_peek((ring_t*)&uart_rx_ring, data);
}
return ret;
}
void uart_tx_flush(void)
{
bool empty;
do
{
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
empty = ring_is_empty(uart_tx_ring);
}
} while(!empty);
}
char *uart_ngets(char *s, size_t n)
{
uint8_t c;
static size_t i = 0;
while(!uart_rx(&c))
{
s[i++] = c;
if(c == '\n' || i >= n-1)
{
s[i] = '\0';
i = 0;
return s;
}
}
return NULL;
}
ISR(USART_UDRE_vect)
{
uint8_t c;
if(!ring_pop((ring_t*)&uart_tx_ring, &c))
UDR0 = c;
else
UCSR0B &= ~(1 << UDRIE0);
}
ISR(USART_RX_vect)
{
if (system_status.status == SYSTEM_STATUS_BUSY)
{
// system busy.. lock now!
CMD_ERROR("SYSTEM BUSY");
system_status.status = SYSTEM_STATUS_LOCKED;
}
if (system_status.status != SYSTEM_STATUS_LOCKED)
{
#ifdef UART_OVERWRITE
ring_push_over((ring_t*)&uart_rx_ring, UDR0);
#else
ring_push((ring_t*)&uart_rx_ring, UDR0);
#endif
}
else{
(uint8_t)UDR0;
}
}
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