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//******************************************************************************
// MSP430x47xx Demo - Flash In-System Programming w/ EEI, Copy SegC to SegD
//
// Description: This program first erases flash seg C, then it increments all
// values in seg C, then it erases seg D, then copies seg C to seg D.
// The EEI bit is set for the Flash Erase Cycles. This does allow the Timer_A
// Interrupts to be handled also during the Segment erase time.
// ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
// //* An external watch crystal between XIN & XOUT is required for ACLK *//
// //* Set Breakpoint on NOP in the Mainloop to avoid Stressing Flash *//
//
// MSP430x47xx
// ---------------
// /|\| XIN|-
// | | | 32kHz
// --|RST XOUT|-
// | |
// | P5.1|-->LED
//
// P. Thanigai / K.Venkat
// Texas Instruments Inc.
// November 2007
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.42A
//******************************************************************************
#include "msp430x47x4.h"
char value; // 8-bit value to write to seg C
// Function prototypes
void write_SegC(char value);
void copy_C2D(void);
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
FCTL2 = FWKEY + FSSEL0 + FN1; // MCLK/3 for Flash Timing Generator
P5DIR |= BIT1; // P5.1 output
TACCTL0 = CCIE; // TACCR0 interrupt enabled
TACCR0 = 50000;
TACTL = TASSEL_2 + MC_1; // SMCLK, upmode
value = 0; // initialize value
__enable_interrupt(); // enable interrupts
while(1) // Repeat forever
{
write_SegC(value++); // Write segment C, increment value
copy_C2D(); // Copy segment C to D
__no_operation(); // SET BREAKPOINT HERE
}
}
void write_SegC(char value)
{
char *Flash_ptr; // Flash pointer
unsigned int i;
Flash_ptr = (char *)0x1040; // Initialize Flash pointer
FCTL3 = FWKEY; // Clear Lock bit
FCTL1 = FWKEY + ERASE + EEI; // Set Erase bit, allow interrupts
*Flash_ptr = 0; // Dummy write to erase Flash seg
FCTL1 = FWKEY + WRT; // Set WRT bit for write operation
for (i = 0; i < 64; i++)
{
*Flash_ptr++ = value; // Write value to flash
}
FCTL1 = FWKEY; // Clear WRT bit
FCTL3 = FWKEY + LOCK; // Set LOCK bit
}
void copy_C2D(void)
{
char *Flash_ptrC; // Segment C pointer
char *Flash_ptrD; // Segment D pointer
unsigned int i;
Flash_ptrC = (char *)0x1040; // Initialize Flash segment C ptr
Flash_ptrD = (char *)0x1000; // Initialize Flash segment D ptr
FCTL1 = FWKEY + ERASE + EEI; // Set Erase bit, allow interrupts
FCTL3 = FWKEY; // Clear Lock bit
*Flash_ptrD = 0; // Dummy write to erase Flash seg D
FCTL1 = FWKEY + WRT; // Set WRT bit for write operation
for (i = 0; i < 64; i++)
{
*Flash_ptrD++ = *Flash_ptrC++; // copy value segment C to seg D
}
FCTL1 = FWKEY; // Clear WRT bit
FCTL3 = FWKEY + LOCK; // Set LOCK bit
}
// Timer A0 interrupt service routine
#pragma vector = TIMERA0_VECTOR
__interrupt void Timer_A(void)
{
P5OUT ^= BIT1; // Toggle P5.1
}
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