Junk Box Arduino by James R. R. Strickland

Author:James R. R. Strickland
Language: eng
Format: epub
Publisher: Apress, Berkeley, CA

select_flash_address(address); //Set the address lines

DATA_WRITE = data; //Set the data lines

set_flash_signals(FLASH_WRITE);

set_flash_signals(FLASH_WAIT_WRITE);

//pulse /W low. It only has to go low a few nanoseconds.

// Nothing on the cestino happens in less than 50, so we're

// not going too fast for the 85ns 39SF020A. If your flash

// is slower, you may have to add a delay.

}

// ----------------------------------------------------------

// program_flash(address,data)

// ----------------------------------------------------------

// To actually store (program) data onto the flash, we have to

// send it a specific pattern of addresses and data bytes before

// we send it the address we want and the byte of data we want

// stored there.

// To that end, we set DATA_DDR to output so we can write data,

// then call set_flash_signals to set it to FLASH_WAIT_WRITE

// mode. This disables /OE (gate) but does not enable /W (write).

// We call send_to_flash four times. The first three tell the

// flash controller what we want to do, and the fourth call

// gives it our address and data.

// Then clear the DATA_WRITE pins and set DATA_DDR back to

// read mode. Delay 1ms to because flash is slow and we're

// not polling its status line to tell when it's done. Set the

// flash's control signals to FLASH_READ mode and we're done.

// ----------------------------------------------------------

void program_flash(uint32_t address, byte data) {

DATA_DDR = 0xFFFF;

set_flash_signals(FLASH_WAIT_WRITE);

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