PCF85263A RTC issue

Thenmozhi — Sat, 06 May 2023 08:02:48 GMT

we are using external RTC PCF85263A for PIC32MM0256GPM064 microcontroller .we faced issues utilizing PCF85263A.

we tried to updated the time in RTC.it was successfull but the time is not incremented .

we changed the rtc.it was not work.
kindly suggest the solutions for RTC issue.

#include <xc.h>
#include <stdio.h>
#include <stdlib.h>

#define I2Cwrite 0xA2
#define I2CRead 0xA3

void I2C_wait_for_idle(void)
{

while(I2C3CON & 0x1F);
while(I2C3STATbits.TRSTAT);
}

void I2C_start()
{
I2C_wait_for_idle();
I2C3CONbits.SEN = 1;
while (I2C3CONbits.SEN == 1);
}

void I2C_stop()
{
I2C_wait_for_idle();
I2C3CONbits.PEN = 1;
}

void I2C_restart()
{
I2C_wait_for_idle();
I2C3CONbits.RSEN = 1;
while (I2C3CONbits.RSEN == 1);
}
void I2C_ack(void)
{
I2C_wait_for_idle();
I2C3CONbits.ACKDT = 0;
I2C3CONbits.ACKEN = 1;
while(I2C3CONbits.ACKEN);
}

void I2C_nack(void)
{
I2C_wait_for_idle();
I2C3CONbits.ACKDT = 1;
I2C3CONbits.ACKEN = 1;
while(I2C3CONbits.ACKEN);
}

void I2c_write(unsigned char address, char wait_ack)
{
I2C3TRN = address | 0;
while (I2C3STATbits.TBF == 1);
I2C_wait_for_idle();
if (wait_ack) while (I2C1STATbits.ACKSTAT == 1);
}

void I2c_read(unsigned char *value, char ack_nack)
{
I2C3CONbits.RCEN = 1;
while (I2C3CONbits.RCEN);
while (!I2C3STATbits.RBF);
*value = I2C3RCV;

if (!ack_nack)
I2C_ack();
else
I2C_nack();
}

void I2C_Initialize()
{
LATC = 0x00;
ANSELBbits.ANSB13 = 0;
TRISBbits.TRISB13 = 1;
TRISBbits.TRISB7 = 1;
I2C3CONbits.ON = 1;
I2C3CONbits.DISSLW = 1;
I2C3BRG = 7;
I2C3STAT = 0x0;
}

void PCF85263_write(unsigned char reg_address, unsigned char value)
{
I2C_start();
I2c_write(I2Cwrite , 1);
I2c_write(reg_address,1);
I2c_write(value,1);
I2C_stop();
}
void PCF85263_read(unsigned char reg_address, unsigned char *value)
{
I2C_start();
I2c_write(I2Cwrite , 1);
I2c_write(reg_address,1);
I2C_restart();
I2c_write( I2CRead ,1);
I2c_read(value, 1);
I2C_stop();
}

void rtc_read()
{

PCF85263_read(0x2E, &value);
PCF85263_read(0x28, &data);
PCF85263_read(0x01, &sec);
PCF85263_read(0x02, &min);
PCF85263_read(0x03, &hours);
PCF85263_read(0x04, &date);
PCF85263_read(0x05, &day);
PCF85263_read(0x06, &month);
PCF85263_read(0x07, &years);

}

void rtc_write()
{

PCF85263_write(0x2E, 0x01);
PCF85263_write(0x28, 0xA4);
PCF85263_write(0x01, 0x00);
PCF85263_write(0x02, 0x00);
PCF85263_write(0x03, 0x00);
PCF85263_write(0x04, 0x05);
PCF85263_write(0x05, 0x06);
PCF85263_write(0x06, 0x05);
PCF85263_write(0x07, 0x23);
PCF85263_write(0x2E, 0x00);

}

Re: PCF85263A RTC issue

ErichStyger — Sun, 07 May 2023 14:25:11 GMT

I'm using the PCF85063A, but I thing your device is similar.

The CTRL register has a STOP bit which stops/disables the clock.

See for example my implementation here:

https://github.com/ErichStyger/McuOnEclipseLibrary/blob/master/lib/src/McuPCF85063A.c

So check your data sheet for a STOP bit and check the setting of this bit.

I hope this helps,

Erich

Processor Expert SoftwareのトピックPCF85263A RTC issue

PCF85263A RTC issue

Re: PCF85263A RTC issue