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Found 2 results

  1. Hello, I am having trouble using a SPI DS3234 RTC with Energia and TivaC series launchpad. I am using the ds3234 library at https://github.com/rodan/ds3234 which is originally written for arduino. I modified few settings in the initialization, tried few things, but have not had any luck. The module will not talk spi at all, and I get 1900.00.00 00:00:00 for date all the time. Here is the relevant code from the init section: void DS3234_init(const uint8_t pin, const uint8_t ctrl_reg) { pinMode(pin, OUTPUT); SPI.setModule(2); SPI.begin(); SPI.setClockDivider(SPI_CLOCK_DIV32); SPI.setBitOrder(MSBFIRST); SPI.setDataMode(SPI_MODE3); DS3234_set_creg(pin, ctrl_reg); delay(10); } First off I am setting spi port 2, before spi.begin. I tried all clock_dividers. The ds3234 supports upto 4mhz spi speed, so considering 80mhz clock speed for tivac board, I am using a div32 divider. I also scanned all of the dividers. I tried spi_mode 1 and 3 also. I also checked with an oscilloscope, that I am indeed talking with SPI2 port. (I can see the clock and cs lines with little spikes, when the tiva-c sends commands). For some reason the SPI port in the TivaC is unable to talk with this RTC chip. I could not figure out why. I tested the same code on a MSP430F5529 with the RTC connected to SPI0 port, and it worked as expected. Here is the relevant part for that one: (I only commented out the setModule statement, and used the div8 divider) void DS3234_init(const uint8_t pin, const uint8_t ctrl_reg) { pinMode(pin, OUTPUT); //SPI.setModule(2); SPI.begin(); SPI.setClockDivider(SPI_CLOCK_DIV8); SPI.setBitOrder(MSBFIRST); SPI.setDataMode(SPI_MODE3); DS3234_set_creg(pin, ctrl_reg); delay(10); } I also found a forum post at http://forum.43oh.com/topic/9016-ds3234-rtc-peek-poke/ which complains about not being able to peek / poke the internal SRAM of the ds3234 - but unfortunately was not answer. I am speculating this too arises from similar SPI trouble. Any ideas/recomendations/help greatly appreciated, Best Regards, C.
  2. G'day, Has anyone peek'ed an poked the SRAM on the DS3234 RTC My poke code is: . digitalWrite(P_RTC_CS, LOW); SPI.transfer(0x98); //SRAM address register SPI.transfer(0x01); //sram address I want to use SPI.transfer(timerValue); digitalWrite(P_RTC_CS, HIGH); Peek code is: digitalWrite(P_RTC_CS, LOW); SPI.transfer(0x98); //SRAM address register SPI.transfer(0x01); // digitalWrite(P_RTC_CS, HIGH); digitalWrite(P_RTC_CS, LOW); SPI.transfer(0x19); //read data pointed to by SRAM address register timerValue = SPI.transfer(0x00); digitalWrite(P_RTC_CS, HIGH); I keep reading 254 Tks
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