| ??? 11/04/08 13:02 Read: times |
#159624 - flash memeory reading |
Hello,
I program a code to write and read the flash memory in my MCU (C8051F020) in C ? The writing is ok but not the reading. After reading, i send the value by UART. This function isn't ok. can i help me ?
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include "C8051F020.h" // SFR declarations
#include "stdio.h"
//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F02x
//-----------------------------------------------------------------------------
sfr16 DP = 0x82; // data pointer
sfr16 TMR3RL = 0x92; // Timer3 reload value
sfr16 TMR3 = 0x94; // Timer3 counter
sfr16 ADC0 = 0xbe; // ADC0 data
sfr16 ADC0GT = 0xc4; // ADC0 greater than window
sfr16 ADC0LT = 0xc6; // ADC0 less than window
sfr16 RCAP2 = 0xca; // Timer2 capture/reload
sfr16 T2 = 0xcc; // Timer2
sfr16 RCAP4 = 0xe4; // Timer4 capture/reload
sfr16 T4 = 0xf4; // Timer4
sfr16 DAC0 = 0xd2; // DAC0 data
sfr16 DAC1 = 0xd5; // DAC1 data
//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------
#define SYSCLK 22118400 // SYSCLK frequency in Hz
#define BAUDRATE 115200 // Baud rate of UART in bps
sbit LED = P1^6; // LED='1' means ON
//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
void SYSCLK_Init (void);
void PORT_Init (void);
void UART0_Init (void);
void Timer0_ms (unsigned ms);
//unsigned char EE_Read (unsigned Addr);
//void EE_Write (unsigned Addr, unsigned char value);
//-----------------------------------------------------------------------------
// Global VARIABLES
//-----------------------------------------------------------------------------
char eedata [6];
unsigned int ii;
//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void) {
unsigned char xdata * idata pwrite; // pointer to FLASH used for writes
// NOTE: this pointer must be located
// in <data> or <idata> space!
unsigned char code *pread; // pointer to FLASH used for reads
char EA_save; // saves the current state of the
// interrupt enable bit.
// test string stored in FLASH
unsigned char code test_string[] = "Howdy!";
// disable watchdog timer
WDTCN = 0xde;
WDTCN = 0xad;
SYSCLK_Init (); // initialize oscillator
PORT_Init (); // initialize crossbar and GPIO
UART0_Init (); // initialize UART0
// PART A -- erase the FLASH page at 0x1000
// initialize write/erase pointer
pwrite = (unsigned char xdata *) 0x1000;
EA_save = EA; // save interrupt status
EA = 0; // disable interrupts (precautionary)
FLSCL |= 0x01; // enable FLASH writes/erases from
// user software
PSCTL = 0x03; // MOVX writes erase FLASH page
*pwrite = 0; // initiate page erase
PSCTL = 0; // MOVX writes target XRAM
FLSCL &= ~0x01; // disable FLASH writes/erases from
// user software
EA = EA_save; // re-enable interrupts
// PART B -- copy test string to FLASH memory at address 0x1000
// initialize FLASH read pointer
pread = (unsigned char code *) test_string;
EA_save = EA; // save interrupt status
EA = 0; // disable interrupts (precautionary)
pwrite = 0x1000; // initialize FLASH write pointer
FLSCL |= 0x01; // enable FLASH writes/erases from
// user software
PSCTL = 0x01; // MOVX writes target FLASH memory
while (*pread != '\0') { // copy until NULL is detected
*pwrite = *pread; // copy byte
pread++; // advance pointers
pwrite++;
}
*pwrite = '\0';
PSCTL = 0x00; // MOVX writes target XRAM
FLSCL &= ~0x01; // disable FLASH writes/erases from
// user software
EA = EA_save; // re-enable interrupts
// PART C -- read test string to FLASH memory at address 0x1000 and copy in tab eedata
EA_save = EA;
EA = 0;
pwrite = 0x1000;
FLSCL |= 0x40;
PSCTL = 0x00;
while (*pread !='\0') {
*eedata = *pread; // copy byte
pread++; // advance pointers
pwrite++;
}
PSCTL = 0x00; // MOVX writes target XRAM
FLSCL &= ~0x40; // disable FLASH writes/erases from
// user software
EA = EA_save; // re-enable interrupts
while (1) // spin forever
{
for (ii=0;ii<6; ii++)
{
LED = 1;
printf("%c",eedata[ii]);
printf("@13");
}
printf("\x0d");
printf("\x0a");
LED = 0;
}
}
//-----------------------------------------------------------------------------
// Subroutines
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// This routine initializes the system clock to use an 22.1184 MHz crystal
// as its clock source.
//
void SYSCLK_Init (void)
{
int i; // delay counter
OSCXCN = 0x67; // start external oscillator with
// 22.1184 MHz crystal
for (i=0; i < 256; i++) ; // Wait for osc. to start up
while (!(OSCXCN & 0x80)) ; // Wait for crystal osc. to settle
OSCICN = 0x88; // select external oscillator as SYSCLK
// source and enable missing clock
// detector
}
//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Configure the Crossbar and GPIO ports
//
void PORT_Init (void)
{
XBR0 |= 0x06; // Enable SPI0 and UART0
XBR1 = 0x00;
XBR2 = 0x40; // Enable crossbar and weak pull-ups
P0MDOUT |= 0x15; // enable P0.0 (TX), P0.2 (SCK), and
// P0.4 (MOSI) as push-pull outputs
P1MDOUT |= 0x40; // enable P1.6 (LED) as push-pull outputs
//P74OUT |= 0x01; //pins 4.0 and 4.1 as push-pull outputs
}
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