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56 lines
1.3 KiB
56 lines
1.3 KiB
10 years ago
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#pragma once
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//
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// SD card low-level I/O utilities
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//
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// Inspired by:
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// http://www.avrfreaks.net/forum/tutc-simple-fat-and-sd-tutorial
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//
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <util/delay.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "iopins.h"
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#include "spi.h"
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#include "uart.h"
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#include "stream.h"
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/** Init SD card on SPI */
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bool sd_init();
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/**
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* Send a command to the SD card
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*
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* @param cmd command to send
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* @param arg command argument
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* @return return value on success, 0xFF if nothing received back.
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*/
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uint8_t sd_command(const uint8_t cmd, const uint32_t arg);
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/**
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* Read from a sector into a buffer memory structure.
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*
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* @param sector sector to read (512 bytes long each)
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* @param read_at offset within the sector
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* @param buffer target buffer
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* @param write_at target starting address
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* @param len number of bytes to read
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* @return true on success
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*/
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bool sd_read(const uint32_t sector, const uint16_t read_at, uint8_t * buffer, const uint16_t write_at, const uint16_t len);
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/**
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* Write bytes from a buffer into a sector.
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*
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* @param sector sector to write (512 bytes long each)
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* @param buffer512 source buffer
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* @return true on success
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*/
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bool sd_write(const uint32_t sector, const uint8_t * buffer512);
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