at_flash.c

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/*
 * File:        at_flash.c
 * Purpose:     Atmel flash handler functions
 * Author:      Peter Ivanov, Olimex Ltd.
 * Modified by:
 * Created:     2007-05-19 11:29:32
 * Last modify: 2007-10-14 15:39:42 ivanovp {Time-stamp}
 * Copyright:   (C) Peter Ivanov, 2007
 * Licence:     GPL
 */
#include <msp430xG461x.h>
#include "at_flash.h"

#define BUFFER_1_WRITE                      0x84    // buffer 1 write
#define BUFFER_2_WRITE                      0x87    // buffer 2 write
#define BUFFER_1_READ                       0x54    // buffer 1 read
#define BUFFER_2_READ                       0x56    // buffer 2 read        
#define B1_TO_MM_PAGE_PROG_WITH_ERASE       0x83    // buffer 1 to main memory page program with built-in erase
#define B2_TO_MM_PAGE_PROG_WITH_ERASE       0x86    // buffer 2 to main memory page program with built-in erase
#define B1_TO_MM_PAGE_PROG_WITHOUT_ERASE    0x88    // buffer 1 to main memory page program without built-in erase
#define B2_TO_MM_PAGE_PROG_WITHOUT_ERASE    0x89    // buffer 2 to main memory page program without built-in erase
#define MM_PAGE_PROG_THROUGH_B1             0x82    // main memory page program through buffer 1
#define MM_PAGE_PROG_THROUGH_B2             0x85    // main memory page program through buffer 2
#define AUTO_PAGE_REWRITE_THROUGH_B1        0x58    // auto page rewrite through buffer 1
#define AUTO_PAGE_REWRITE_THROUGH_B2        0x59    // auto page rewrite through buffer 2
#define MM_PAGE_TO_B1_COMP                  0x60    // main memory page compare to buffer 1
#define MM_PAGE_TO_B2_COMP                  0x61    // main memory page compare to buffer 2
#define MM_PAGE_TO_B1_XFER                  0x53    // main memory page to buffer 1 transfer
#define MM_PAGE_TO_B2_XFER                  0x55    // main memory page to buffer 2 transfer
#define READ_STATUS_REGISTER                0xD7    // read status register
#define CONTINUOUS_ARRAY_READ               0xE8    // continuous read
#define MAIN_MEMORY_PAGE_READ               0x52    // main page read
#define PAGE_ERASE                          0x81    // page erase

// buffer for test
unsigned char WriteBuffer[]   = { 1, 2, 3, 4, 5, 6, 5, 8, 9, 0 };
unsigned char ReadBuffer[]    = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

void InitUCA_SPI(void) 
{
    // master mode, data valid on rising edge, msb first
    UCA0CTL0 = UCCKPH + UCMST + UCMSB + UCSYNC;

    // clock -> SMCLK
    UCA0CTL1 = UCSSEL1;

    // Baud Rate
    UCA0BR0 = 0x80;        
    UCA0BR0 = 0x00; // BR1 ??? XXX

    // second functionality of pin
    P7SEL |= 0x0e;        // P7.1-3 SPI option select
    P7DIR |= 0x0b;        // P7.0 output direction
    P7OUT |= 0x01;        // P7.0 HIGH

}

void FlashEnable(void) 
{
    // Set P7.0 to LOW
    P7OUT &= ~0x01;
}

void FlashDisable(void) 
{
    // Set P7.0 to HIGH
    P7OUT |= 0x01;
}

unsigned char WriteByte(unsigned char data) 
{
    while ((IFG2&UCA0TXIFG)==0);    // wait while not ready / for RX
    UCA0TXBUF = data;        // write
    while ((IFG2&UCA0RXIFG)==0);    // wait for RX buffer (full)
    return (UCA0RXBUF);
}

unsigned char FlashBusy(void)
{

    unsigned char result;

    FlashEnable();

    // Send RDSR - Read Status Register opcode
    WriteByte(READ_STATUS_REGISTER);

    // Get register contents
    result = WriteByte(0x0);

    FlashDisable();

    if (result&0x80)
    {
        return 0;
    }
    else
    {
        return 1;
    }

}

void ByteToBuffer(unsigned int byte, unsigned int address) 
{

    unsigned int addr    = 0;
    //unsigned int page    = 0;

    //page = address/264;
    addr = address%264;    

    // Wait for write to complete
    while( FlashBusy() );    

    // perform to transfer

    // Set the Write Enable latch
    FlashEnable();

    WriteByte(BUFFER_1_WRITE);

    WriteByte(0x00);

    WriteByte((*((unsigned char*)&addr +1)));

    WriteByte(((unsigned char)addr));

    // Send the byte to write
    WriteByte(byte);

    FlashDisable();

    // Wait for write to complete
    while( FlashBusy() );
}

void FlashReadArray(unsigned long address, unsigned char *buffer, unsigned char length) 
{

    unsigned int addr    = 0;
    unsigned int page    = 0;

    page = address/264;
    addr = address%264;

    page<<=1;    

    FlashEnable();

    // Send READ opcode
    WriteByte(CONTINUOUS_ARRAY_READ);
    
    // 24 bit page and address
    WriteByte((*((unsigned char*)&page+1)));

    WriteByte((((unsigned char)page&0xFE)|(*((unsigned char*)&addr+1) & 0x01)));

    WriteByte((unsigned char)addr);

    // 32 don't care bits
    WriteByte(0x00);
    WriteByte(0x00);
    WriteByte(0x00);
    WriteByte(0x00);

    while(length--)
    {
       *buffer++ = WriteByte(0x0);
    };
    


    FlashDisable();
}


void WriteBufferToMainMemory(unsigned int address) 
{
    
    //unsigned int addr    = 0;
    unsigned int page    = 0;

    page = address/264;
    //addr = address%264;    

    page<<=1;

    // Wait for write to complete
    while( FlashBusy() );    

    FlashEnable();

    //command
    WriteByte(B1_TO_MM_PAGE_PROG_WITH_ERASE);

    //6 reserved + 2 high address
    WriteByte((*((unsigned char*)&page+1)));

    //7 low address bits + 1 don't care
    WriteByte(((unsigned char)page));

    //don't care 8 bits
    WriteByte(0x00);

    FlashDisable();

    // Wait for write to complete
    while( FlashBusy() );
}

void ReadBufferFromMainMemory(unsigned int address) 
{

    //unsigned int addr    = 0;
    unsigned int page    = 0;

    page = address/264;
    //addr = address%264;    

    page<<=1;

    // Wait for write to complete
    while( FlashBusy() );    

    FlashEnable();

    //command
    WriteByte(MM_PAGE_TO_B1_XFER);

    //6 reserved + 2 high address
    WriteByte((*((unsigned char*)&page+1)));

    //7 low address bits + 1 don't care
    WriteByte(((unsigned char)page));

    //don't care 8 bits
    WriteByte(0x00);

    FlashDisable();

    // Wait for write to complete
    while( FlashBusy() );
}


char TestATFlash(void) 
{
    char i;

    // Test led and flash memory
    InitUCA_SPI();

    // Write WriteBuffer
    for(i=0; i<10; i++) 
    {
        ByteToBuffer(WriteBuffer[i], i);
    }
    WriteBufferToMainMemory(0);

    // Read ReadBuffer
    FlashReadArray(0, ReadBuffer, 10);

    // check for Correct Read
    for (i=0; i<10; i++) 
    {
        if(WriteBuffer[i]!=ReadBuffer[i]) 
        {
            return 0;
        }
    }

    return 1;
}

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