XNAND.c

#include "XNAND.h"
#include "XSPI.h"

void XNAND_ClearStatus()
{
    uint8_t tmp[4];
    XSPI_Read(0x04, tmp);
    XSPI_Write(0x04, tmp);
}

uint16_t XNAND_GetStatus()
{
    return XSPI_ReadWord(0x04);
}

uint8_t XNAND_WaitReady(uint16_t timeout)
{
	do {
		if (!(XSPI_ReadByte(0x04) & 0x01))
			return 1;
	} while (timeout--);

	return 0;
}

uint16_t XNAND_Erase(uint32_t blockNum)
{
	uint8_t tmp[4];

	XNAND_ClearStatus();

	XSPI_Read(0, tmp);
	tmp[0] |= 0x08;
	XSPI_Write(0, tmp);

	XSPI_WriteDword(0x0C, blockNum << 9);

	if (!XNAND_WaitReady(0x1000))
		return 0x8001;

	XSPI_WriteByte(0x08, 0xAA);
	XSPI_WriteByte(0x08, 0x55);

	if (!XNAND_WaitReady(0x1000))
		return 0x8002;

	XSPI_WriteByte(0x08, 0x5);

	if (!XNAND_WaitReady(0x1000))
		return 0x8003;

	return XNAND_GetStatus();
}

uint16_t XNAND_StartRead(uint32_t blockNum)
{
    uint16_t res;
    
    XNAND_ClearStatus();
    
    XSPI_WriteDword(0x0C, blockNum << 9);
    
    XSPI_WriteByte(0x08, 0x03);
    
    if (!XNAND_WaitReady(0x1000))
		return 0x8011;
	
	res = XNAND_GetStatus();
	
    XSPI_Write0(0x0C);
    
    return res;
}

void XNAND_ReadFillBuffer(uint8_t* buf, uint8_t wordCount)
{
    while(wordCount--)
    {
        XSPI_Write0(0x08);
        XSPI_Read(0x10, buf);
        buf += 4;
    }
}

void XNAND_StartWrite()
{
    XNAND_ClearStatus();
    XSPI_Write0(0x0C);
}

void XNAND_WriteProcess(uint8_t* buf, uint8_t wordCount)
{
    while(wordCount--)
    {
        XSPI_Write(0x10, buf);
        XSPI_WriteByte(0x08, 0x01);
        buf += 4;
    }    
}

uint16_t XNAND_WriteExecute(uint32_t blockNum)
{
    XSPI_WriteDword(0x0C, blockNum << 9);
    
    XSPI_WriteByte(0x08, 0x55);
	XSPI_WriteByte(0x08, 0xAA);
	XSPI_WriteByte(0x08, 0x4);
    
    if (!XNAND_WaitReady(0x1000))
		return 0x8021;
    
    return XNAND_GetStatus();
}