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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/spi.h"
#include <stdio.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#if SPI_MODE == 0
#define CPOL_VALUE 0
#define CPHA_VALUE 0
#elif SPI_MODE == 1
#define CPOL_VALUE 0
#define CPHA_VALUE 1
#elif SPI_MODE == 2
#define CPOL_VALUE 1
#define CPHA_VALUE 0
#elif SPI_MODE == 3
#define CPOL_VALUE 1
#define CPHA_VALUE 1
#else
#error "No valid SPI_MODE defined!"
#endif
#if SPI_DORD == 0
#define DORD_VALUE 0
#elif SPI_DORD == 1
#define DORD_VALUE 1
#else
#error "No valid SPI_DORD defined!"
#endif
static volatile uint8_t *spi_out;
static volatile uint8_t *spi_in;
static volatile size_t spi_len;
static volatile uint8_t *spi_port;
static volatile uint8_t spi_pin;
void spi_init(void)
{
DDRB |= (1 << DDB2) | (1 << DDB3) | (1 << DDB5);
SPSR |= (SPI2X_VALUE << SPI2X);
SPCR |= (1 << SPIE) | (1 << SPE) | (DORD_VALUE << DORD) | (1 << MSTR)
| (CPOL_VALUE << CPOL) | (CPHA_VALUE << CPHA)
| (SPR1_VALUE << SPR1) | (SPR0_VALUE << SPR0);
}
bool spi_busy(void)
{
return spi_len;
}
void spi_flush(void)
{
while(spi_len);
}
void spi_start(
uint8_t *out,
uint8_t *in,
size_t len,
uint8_t *port,
uint8_t pin
)
{
spi_flush();
spi_out = out;
spi_in = in;
spi_len = len;
spi_port = port;
spi_pin = pin;
if(spi_port)
*spi_port &= ~(1 << spi_pin);
SPDR = *spi_out++;
}
ISR(SPI_STC_vect)
{
if(spi_in)
{
*spi_in++ = SPDR;
}
if(--spi_len)
SPDR = *spi_out++;
else
if(spi_port)
*spi_port |= (1 << spi_pin);
}
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