You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
1.3 KiB
70 lines
1.3 KiB
8 years ago
|
#pragma once
|
||
|
|
|
||
|
|
#include <avr/io.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include "calc.h"
|
||
|
|
#include "iopins.h"
|
||
|
|
|
||
|
|
#define PIN_MISO 12
|
||
|
|
#define PIN_MOSI 11
|
||
|
|
#define PIN_SCK 13
|
||
|
|
#define PIN_SS 10
|
||
|
|
|
||
|
|
/** Bit order */
|
||
|
|
enum SPI_order {
|
||
|
|
SPI_LSB_FIRST = 0,
|
||
|
|
SPI_MSB_FIRST = 1
|
||
|
|
};
|
||
|
|
|
||
|
|
/** Clock polarity */
|
||
|
|
enum SPI_cpol {
|
||
|
|
CPOL_0 = 0,
|
||
|
|
CPOL_1 = 1
|
||
|
|
};
|
||
|
|
|
||
|
|
/** Clock phase */
|
||
|
|
enum SPI_cpha {
|
||
|
|
CPHA_0 = 0,
|
||
|
|
CPHA_1 = 1
|
||
|
|
};
|
||
|
|
|
||
|
|
/** Clock prescaller <SPI2X><SPR1><SPR0> */
|
||
|
|
enum SPI_clk_div {
|
||
|
|
SPI_DIV_2 = 0b100, // 2x (master only, can't receive at this speed)
|
||
|
|
SPI_DIV_4 = 0b000,
|
||
|
|
SPI_DIV_8 = 0b101, // 2x
|
||
|
|
SPI_DIV_16 = 0b001,
|
||
|
|
SPI_DIV_32 = 0b110, // 2x
|
||
|
|
SPI_DIV_64 = 0b010,
|
||
|
|
SPI_DIV_128 = 0b011
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/** Set SS to active state (LOW) */
|
||
|
|
#define spi_ss_enable() pin_down(PIN_SS)
|
||
|
|
|
||
|
|
|
||
|
|
/** Set SS to disabled state (HIGH) */
|
||
|
|
#define spi_ss_disable() pin_up(PIN_SS)
|
||
|
|
|
||
|
|
|
||
|
|
/** Enable SPI ISR */
|
||
|
|
#define spi_isr_enable(yes) set_bit(SPCR, SPIE, yes)
|
||
|
|
|
||
|
|
|
||
|
|
/** Init SPI (for SD card communication) */
|
||
|
|
void spi_init_master(enum SPI_order order, enum SPI_cpol cpol, enum SPI_cpha cpha, enum SPI_clk_div clkdiv);
|
||
|
|
|
||
|
|
|
||
|
|
/** Init SPI (for SD card communication) */
|
||
|
|
void spi_init_slave(enum SPI_order order, enum SPI_cpol cpol, enum SPI_cpha cpha);
|
||
|
|
|
||
|
|
|
||
|
|
/** Write a byte to SPI. Returns received byte. */
|
||
|
|
uint8_t spi_send(uint8_t byte);
|
||
|
|
|
||
|
|
|
||
|
|
/** Receive (as slave). Blocking. */
|
||
|
|
uint8_t spi_receive(uint8_t reply);
|