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[Solved] DS3231 and PIC16f628A

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robo_z

Joined: 11 Dec 2014
Posts: 5

[Solved] DS3231 and PIC16f628A

Posted: Wed Jun 14, 2023 1:28 pm

Hello i want show the time and date from a RTC DS3231, but i have problems for show correctly.

this is my code:

Code:

#include <16F628A.h>

#FUSES NOWDT
#FUSES PUT    //Power Up Timer
#FUSES NOMCLR //Master Clear pin enabled
#FUSES BROWNOUT //Reset when brownout detected
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES CPD    //Data EEPROM Code Protected
#FUSES PROTECT //Code protected from reads

#use delay(internal=4MHz)

#use fast_io(A)
#use fast_io(B)

#define DS3231_INT PIN_B0
#define DS3231_SDA PIN_B1
#define DS3231_SCL PIN_B2
#define PIN_TXD    PIN_B7

#use rs232(baud=9600, parity=N, xmit=PIN_TXD, rcv=0, bits=8, DISABLE_INTS, FORCE_SW, stream=SERIE)
#use i2c(MASTER, SDA=DS3231_SDA, SCL=DS3231_SCL, FAST=100000, STREAM=BUS_I2C)

const unsigned int DirDS3231 = 0xD0;
unsigned int Segundo, Minuto, Hora, Dia, Mes, Anio, Alarma1_Min, Alarma1_Hora, Alarma2_Min, Alarma2_Hora, Temperatura;

unsigned int Bcd2Dec(unsigned int MiBCD)
{
return ( (MiBCD >> 4) * 10 + (MiBCD & 0x0F) );
}

unsigned int Dec2Bcd(unsigned int MiDEC)
{
return ( ((MiDEC / 10) << 4) + (MiDEC % 10) );
}

void LeerDS3231(unsigned int DirReloj)
{
i2c_start(BUS_I2C);                      // Inicia la Comunicaion I2C
i2c_write(BUS_I2C, DirReloj);             // Escribimos la Direccion del DS3231
i2c_write(BUS_I2C, 0x00);                // Send register address (Registro Segundos)
i2c_stop(BUS_I2C);                      // Detiene la Comunicaion I2C
i2c_start(BUS_I2C);                      // Reiniciamos la Comunicacion I2C
i2c_write(BUS_I2C, DirReloj | 0x01);       // Iniciamos la Lectura
Segundo = Bcd2Dec(i2c_read(BUS_I2C, 1));    // Leemos Segundos Del Registro 0
Minuto = Bcd2Dec(i2c_read(BUS_I2C, 1));       // Leemos Minutos Del Registro 1
Hora = Bcd2Dec(i2c_read(BUS_I2C, 1));       // Leemos Hora Del Registro 2
i2c_read(BUS_I2C, 1);                   // Saltamos el Registro 3 (Dia de la Semana)
Dia = Bcd2Dec(i2c_read(BUS_I2C, 1));       // Leemos Fecha Del Registro 4
Mes = Bcd2Dec(i2c_read(BUS_I2C, 1));       // Leemos Mes Del Registro 5
Anio = Bcd2Dec(i2c_read(BUS_I2C, 1));       // Leemos Anio Del Registro 6
i2c_read(BUS_I2C, 1);                   // Saltamos el Registro 7 (Alarma 1 Segundos)
Alarma1_Min = Bcd2Dec(i2c_read(BUS_I2C, 1)); // Leemos Alarma 1 Minutos Del Registro 8
Alarma1_Hora = Bcd2Dec(i2c_read(BUS_I2C, 1)); // Leemos Alarma 1 Horas Del Registro 9
i2c_read(BUS_I2C, 1);                   // Saltamos el Registro 10 (Alarma 1 Fecha)
Alarma2_Min = Bcd2Dec(i2c_read(BUS_I2C, 1)); // Leemos Alarma 2 Minutos Del Registro 11
Alarma2_Hora = Bcd2Dec(i2c_read(BUS_I2C, 1)); // Leemos Alarma 2 Horas Del Registro 12
i2c_read(BUS_I2C, 1);                   // Saltamos el Registro 13 (Alarma 2 Fecha)
i2c_read(BUS_I2C, 1);                   // Saltamos el Registro 14 (Control)
i2c_read(BUS_I2C, 1);                   // Saltamos el Registro 15 (Status)
i2c_read(BUS_I2C, 1);                   // Saltamos el Registro 16 (Anging Offset)
Temperatura = i2c_read(BUS_I2C, 1);          // Leemos Temperatura MSB Del Registro 17
i2c_stop(BUS_I2C);                      // Detiene la Comunicaion I2C
}

void main()
{
setup_comparator(NC_NC_NC_NC);

port_b_pullups(0x0F);

set_tris_a(0x30);
set_tris_b(0x09);

while(TRUE)
{
      LeerDS3231(DirDS3231);
   fprintf(SERIE, "Fecha:%02u/%02u/%02u Hora:%02u:%02u:%02u Temperatura:%02u\r", Dia, Mes, Anio, Hora, Minuto, Segundo, Temperatura);
}
}

but i get irregular data:

Code:

Fecha:14/06/23 Hora:14:22:33 Temperatura:00
Fecha:165/165/165 Hora:165:165:03 Temperatura:255
Fecha:14/06/23 Hora:14:22:33 Temperatura:00
Fecha:165/165/165 Hora:165:165:03 Temperatura:255
Fecha:14/06/23 Hora:14:22:33 Temperatura:32
Fecha:165/165/165 Hora:165:165:03 Temperatura:255
Fecha:14/06/23 Hora:14:22:33 Temperatura:32
Fecha:165/165/165 Hora:165:165:03 Temperatura:255
Fecha:14/06/23 Hora:14:22:33 Temperatura:32
...

how to solve this problem.

thanks for you help.

Last edited by robo_z on Wed Jun 14, 2023 5:02 pm; edited 1 time in total

temtronic

Joined: 01 Jul 2010
Posts: 9229
Location: Greensville,Ontario


Posted: Wed Jun 14, 2023 4:34 pm

hmm...what is the value of the I2C bus pullup resistors ? do you have battery attached to the DS3231 ? also add a 1 second delay in your loop..helps us humans to see better...

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Wed Jun 14, 2023 5:00 pm

You need to do a NACK on the last i2c_read operation. You are doing an ACK. ACK = 1 NACK = 0

robo_z

Joined: 11 Dec 2014
Posts: 5

Posted: Wed Jun 14, 2023 5:01 pm

temtronic wrote:

hmm...what is the value of the I2C bus pullup resistors ?
do you have battery attached to the DS3231 ?

also add a 1 second delay in your loop..helps us humans to see better...

thanks for you help

i solve add a not acknoledge at final of read.

Code:

i2c_read(BUS_I2C, 1);                   // Saltamos el Registro 15 (Status)
i2c_read(BUS_I2C, 1);                   // Saltamos el Registro 16 (Aging Offset)
Temperatura = i2c_read(BUS_I2C, 1);          // Leemos Temperatura MSB Del Registro 17
i2c_read(BUS_I2C, 0);                   // Saltamos el Registro 18 (Temperatura LSB) y Cerramos con NOT ACK
i2c_stop(BUS_I2C);                      // Detiene la Comunicaion I2C

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