Ein MSP430 hat im Bereich ab 01000h zwei Segmente, welche als Info
memory bezeichnet  werden. In diesem Bereich kann man z. B.
Kalibrierdaten eintragen. (SLAC015 flashwrite.c)
Vermutlich ist das Zurücklesen so trivial, dass ich dazu nichts finde.
Meine Frage: Wie kann man die Daten aus dem Info Speicher auslesen.
(vorzugsweise in C)
Wolfgang

Z.B. indem man einen Zeiger mit der Adresse vorbesetzt und
dereferenziert - ist viel einfacher, als bei den AVRs...

Der MSP430 ist eine Von-Neumann-Architektur.

> Meine Frage: Wie kann man die Daten aus dem Info Speicher auslesen.

Genau wie Daten aus jedem anderen Speicherteil.

Hier wird die INFO-Area gelesen und geschrieben:

//******************************************************************************
//  MSP430F20xx Demo - DCO Calibration Constants Programmer
//
//  NOTE: THIS CODE REPLACES THE TI FACTORY-PROGRAMMED DCO CALIBRATION
//  CONSTANTS LOCATED IN INFOA WITH NEW VALUES. USE ONLY IF THE ORIGINAL
//  CONSTANTS ACCIDENTALLY GOT CORRUPTED OR ERASED.
//
//  Description: This code re-programs the F2xx DCO calibration
constants.
//  A software FLL mechanism is used to set the DCO based on an external
//  32kHz reference clock. After each calibration, the values from the
//  clock system are read out and stored in a temporary variable. The
final
//  frequency the DCO is set to is 1MHz, and this frequency is also used
//  during Flash programming of the constants. The program end is
indicated
//  by the blinking LED.
//  ACLK = LFXT1/8 = 32768/8, MCLK = SMCLK = target DCO
//  //* External watch crystal installed on XIN XOUT is required for
ACLK *//
//
//           MSP430F20xx
//         ---------------
//     /|\|            XIN|-
//      | |               | 32kHz
//      --|RST        XOUT|-
//        |               |
//        |           P1.0|--> LED
//        |           P1.4|--> SMLCK = target DCO
//
//  A. Dannenberg
//  Texas Instruments Inc.
//  May 2007
//  Built with IAR Embedded Workbench Version: 3.42A
//******************************************************************************
#include "msp430x20x1.h"

#define DELTA_1MHZ    244                   // 244 x 4096Hz = 999.4Hz
#define DELTA_8MHZ    1953                  // 1953 x 4096Hz = 7.99MHz
#define DELTA_12MHZ   2930                  // 2930 x 4096Hz = 12.00MHz
#define DELTA_16MHZ   3906                  // 3906 x 4096Hz = 15.99MHz

unsigned char CAL_DATA[8];                  // Temp. storage for
constants
volatile unsigned int i;
int j;
char *Flash_ptrA;                           // Segment A pointer
void Set_DCO(unsigned int Delta);

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  for (i = 0; i < 0xfffe; i++);             // Delay for XTAL
stabilization
  P1OUT = 0x00;                             // Clear P1 output latches
  P1SEL = 0x10;                             // P1.4 SMCLK output
  P1DIR = 0x11;                             // P1.0,4 output

  j = 0;                                    // Reset pointer

  Set_DCO(DELTA_16MHZ);                     // Set DCO and obtain
constants
  CAL_DATA[j++] = DCOCTL;
  CAL_DATA[j++] = BCSCTL1;

  Set_DCO(DELTA_12MHZ);                     // Set DCO and obtain
constants
  CAL_DATA[j++] = DCOCTL;
  CAL_DATA[j++] = BCSCTL1;

  Set_DCO(DELTA_8MHZ);                      // Set DCO and obtain
constants
  CAL_DATA[j++] = DCOCTL;
  CAL_DATA[j++] = BCSCTL1;

  Set_DCO(DELTA_1MHZ);                      // Set DCO and obtain
constants
  CAL_DATA[j++] = DCOCTL;
  CAL_DATA[j++] = BCSCTL1;

  Flash_ptrA = (char *)0x10C0;              // Point to beginning of seg
A
  FCTL2 = FWKEY + FSSEL0 + FN1;             // MCLK/3 for Flash Timing
Generator
  FCTL1 = FWKEY + ERASE;                    // Set Erase bit
  FCTL3 = FWKEY + LOCKA;                    // Clear LOCK & LOCKA bits
  *Flash_ptrA = 0x00;                       // Dummy write to erase
Flash seg A
  FCTL1 = FWKEY + WRT;                      // Set WRT bit for write
operation
  Flash_ptrA = (char *)0x10F8;              // Point to beginning of cal
consts
  for (j = 0; j < 8; j++)
    *Flash_ptrA++ = CAL_DATA[j];            // re-flash DCO calibration
data
  FCTL1 = FWKEY;                            // Clear WRT bit
  FCTL3 = FWKEY + LOCKA + LOCK;             // Set LOCK & LOCKA bit

  while (1)
  {
    P1OUT ^= 0x01;                          // Toggle LED
    for (i = 0; i < 0x4000; i++);           // SW Delay
  }
}

void Set_DCO(unsigned int Delta)            // Set DCO to selected
frequency
{
  unsigned int Compare, Oldcapture = 0;

  BCSCTL1 |= DIVA_3;                        // ACLK = LFXT1CLK/8
  TACCTL0 = CM_1 + CCIS_1 + CAP;            // CAP, ACLK
  TACTL = TASSEL_2 + MC_2 + TACLR;          // SMCLK, cont-mode, clear

  while (1)
  {
    while (!(CCIFG & TACCTL0));             // Wait until capture
occured
    TACCTL0 &= ~CCIFG;                      // Capture occured, clear
flag
    Compare = TACCR0;                       // Get current captured
SMCLK
    Compare = Compare - Oldcapture;         // SMCLK difference
    Oldcapture = TACCR0;                    // Save current captured
SMCLK

    if (Delta == Compare)
      break;                                // If equal, leave
"while(1)"
    else if (Delta < Compare)
    {
      DCOCTL--;                             // DCO is too fast, slow it
down
      if (DCOCTL == 0xFF)                   // Did DCO roll under?
        if (BCSCTL1 & 0x0f)
          BCSCTL1--;                        // Select lower RSEL
    }
    else
    {
      DCOCTL++;                             // DCO is too slow, speed it
up
      if (DCOCTL == 0x00)                   // Did DCO roll over?
        if ((BCSCTL1 & 0x0f) != 0x0f)
          BCSCTL1++;                        // Sel higher RSEL
    }
  }
  TACCTL0 = 0;                              // Stop TACCR0
  TACTL = 0;                                // Stop Timer_A
  BCSCTL1 &= ~DIVA_3;                       // ACLK = LFXT1CLK
}

danke, es funktioniert
Wolfgang