RTC with DS1307

RE: RTC with DS1307

f1rew4ll — Sat, 02 Sep 2017 05:30:01 GMT

I have the same problem. Once I add a ds1307RTC.h library into my code then I can read the time on the serial port but ble stops advertising and is not visible by device. Once I comment that library then obviously cannot get the time but ble is discoverable.. Any solutions?

RE: RTC with DS1307

srijan12 — Fri, 16 Jun 2017 08:36:33 GMT

This works in blocking mode. The read function gives zero once in a while, maybe because I am not checking the availability of twi.

void twiWriteData(uint8_t regVal, uint8_t dataVal) { uint8_t reg[2] = {0,0};

if (regVal == 100)
{
	reg[0] = 0;
	err_code = nrf_drv_twi_tx(&m_twi_driver, DS1307_ADDR, reg, 1, 0);		
}

reg[0] = regVal;
reg[1] = dataVal;

err_code = nrf_drv_twi_tx(&m_twi_driver, DS1307_ADDR, reg, 2, 0); }

uint8_t twiReadData(uint8_t regVal) { uint8_t myVal = 0; err_code = nrf_drv_twi_tx(&m_twi_driver, DS1307_ADDR, &regVal, 1, 1);
APP_ERROR_CHECK(err_code);

if (NRF_SUCCESS == err_code)
{
	err_code = nrf_drv_twi_rx(&m_twi_driver, DS1307_ADDR, &myVal, 1);
	APP_ERROR_CHECK(err_code);
}

//twiWriteData(100,0);		// generate Stop condition

return myVal;

}

You need to write 0 to register 0 to kickstart the IC.

RE: RTC with DS1307

Jax — Thu, 15 Jun 2017 09:54:42 GMT

Not yet, still not working

RE: RTC with DS1307

srijan12 — Thu, 15 Jun 2017 09:34:05 GMT

Hi!

Same here. Did you make it?

RE: RTC with DS1307

Jax — Mon, 10 Apr 2017 12:09:28 GMT

Hi I also can not Read from ds1307. Could you please share how you did it?

RE: RTC with DS1307

Inspectron — Wed, 05 Oct 2016 14:46:19 GMT

I got it. The adress for the slave is always 0x68. I assumed the the last bit(R/W) belongs to the 7 bits of the adress. So for Read I had 0x69 as slave adress. Now I will get the right data back. Thank you for the support!

RE: RTC with DS1307

Alex — Wed, 05 Oct 2016 14:00:10 GMT

Have you applied correct power to both Vcc and Vbat? In order to enable clock write zero to Seconds(address 0x00), looks like on applying power it is disabled by default

RE: RTC with DS1307

Inspectron — Wed, 05 Oct 2016 13:06:33 GMT

Now I will get only one byte data back from the DS1307. And its always 0x00. I think that the oscillator is disabled. But I have no success to enable it.

RE: RTC with DS1307

Alex — Wed, 05 Oct 2016 12:39:29 GMT

Yes, exactly.

RE: RTC with DS1307

Inspectron — Wed, 05 Oct 2016 12:27:42 GMT

How do you mean I dont need a stop condition after writing adress? You are talking about figure 6 right?

RE: RTC with DS1307

Alex — Wed, 05 Oct 2016 12:22:59 GMT

I'm sorry, I'm using different SDK and look like they changed name of the parameter. Basically you don't need to issue stop condition after writing address of register. Then issue stop after reading.

RE: RTC with DS1307

Inspectron — Wed, 05 Oct 2016 11:30:02 GMT

nrf_drv_twi_tx(nrf_drv_twi_t const * p_instance,uint8_t address,uint8_t const * p_data,uint8_t length, bool no_stop)

So if I understand it right no_stop = false -> This will send a stop. And no_stop = true -> would send no stop. I have this from the TWI_sensor example.

RE: RTC with DS1307

Alex — Wed, 05 Oct 2016 09:25:10 GMT

Shell it be nrf_drv_twi_tx(&m_twi_driver, SLAVE_ADRESSE_W, reg, 1, **true**);? And you need to read one register at a time or read sequentially 6 registers from Seconds to Month. In any case 'reg' should be reg[1] with the address to read and only one nrf_drv_twi_rx for each tx reading as many sequential bytes as you need.