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