serial_ram.h

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#include <config.h>

/* Requires use of spi.h, and hence assumes definitions of:


        SPI_PORT                Port for the SPI signals eg PORTB
        SPI_DDR                 DDR for the SPI signals eg DDRB
        SPI_PIN                 Input Port for the SPI signals eg PINB

        SPI_SCK                 Clock from master to slave
        SPI_MOSI                Data from Master to slave
        SPI_MISO                Data from slave to master



Additionally, the following needs to be defined:

        RAM_CS
        RAM_PORT
        RAM_DDR



/* Register definitions for M25P16 flash ram */
#define RAM_WREN 0x06   /* write enable */
#define RAM_WRDI 0x04   /* write disable */
#define RAM_RDID 0x9F   /* read id */
#define RAM_RDSR 0x05   /* read status */
#define RAM_WRSR 0x01   /* write status */
#define RAM_READ 0x03   /* read data */
#define RAM_FASTREAD 0x0B       
#define RAM_PP 0x02             /* page program */
#define RAM_SE 0xD8             /* sector erase */
#define RAM_BE 0xC7             /* bulk erase */
#define RAM_DP 0xB9             /* deep power down */
#define RAM_RES 0xAB    /* release from power down, read electronic signature */


void read_ram_id(uint8_t* mem_ptr);



uint8_t read_ram_status();



void ram_bulk_erase();



void ram_sector_erase(uint8_t sector);



void write_flash_page(uint8_t flash_sector, uint8_t flash_page, uint8_t* mem_ptr);



void read_flash_page(uint8_t flash_sector, uint8_t flash_page, uint8_t* mem_ptr);



void read_write_flash_ram(uint8_t one_read_zero_write, uint16_t bytes_to_readwrite, uint8_t flash_sector, uint8_t flash_page, uint8_t offset, uint8_t* mem_ptr);


void write_ram_status(uint8_t status);



void power_up_flash_ram(void);



void power_down_flash_ram(void);