[Tinyos-help] Connecting PCF8563 RTC to Iris

[Andres Vahter]

Hi,

I'm tryng to connect PCF8563 real time clock to Iris using I2C. http://www.datasheetcatalog.com/datasheets_pdf/P/C/F/8/PCF8563.shtml
I'm not sure how to read and write time values.
Here is a tutorial how to do it with bus pirate: http://hackaday.com/2009/06/26/parts-i2c-real-time-clock-calendar-pcf8563/
And here is another example from http://www.nxp.com/acrobat_download/applicationnotes/AN_pcf8563-73-83-93_real_time_clock.pdf


Setting the clock is a straight forward procedure, setting first the  
mode and
then the actual time: e.g Friday, July 16 1999, 2’45 pm

	Binary 		Hex,addr,comments

	generate I2C-bus start condition
1 0 1 0  0 0 1 W	A2 		slave address
0 0 0 0  0 0 0 0 	00 		word address 0, next bytes are data
0 0 0 0  0 0 0 0 	00 	00	control/status1, no test modes or POR override
0 0 0 0  0 0 0 0 	00 	01	control/status2, no alarm/timer flags and  
interrupts
0 0 0 0  0 0 0 0 	00 	02 	setting seconds clear the voltage low detector
0 1 0 0  0 1 0 1 	45 	03 	setting minutes
0 0 0 1  0 1 0 0  	14 	04 	setting hours to 14
0 0 0 1  0 1 0 1 	16 	05 	setting days  to 16
0 0 0 0  0 1 0 1 	03 	06 	setting weekdays to Friday
1 0 0 0  0 1 1 1 	07 	07 	setting month to 7 and century bit to 1
1 0 0 1  1 0 0 1 	99 	08 	setting years to 99
1 0 0 0  0 0 0 0 	80 	09 	alarm values reset to 00
1 0 0 0  0 0 0 0 	80 	0A 	alarm values reset to 00
1 0 0 0  0 0 0 0 	80 	0B 	alarm values reset to 00
1 0 0 0  0 0 0 0 	80 	0C	alarm values reset to 00
1 0 0 0  0 0 0 0 	00 	0D 	setting frequency out to 32768Hz e.g. for  
tuning
0 0 0 0  0 0 0 0 	00 	0E	timer switched off
	generate I2C-bus stop condition

How to do it in TinyOS 2? Here's what I did:

---------NodeC.nc-----------------------------
module NodeC {
.........
	uses interface Boot;
	uses interface AMSend as Send;
	uses interface Leds;
	
	uses interface Resource;
	uses interface I2CPacket<TI2CBasicAddr> as I2C;
.......

	uint8_t buffer[4];		// write
	uint8_t rbuffer[4];		// read

.....
	event void Boot.booted() {
		
		call Resource.request();	// RTC i2c
	}


	event void Resource.granted() {
		buffer[0] = 0xA2;
		buffer[1] = 0x00;
		buffer[2] = 0xF;
		buffer[3] = 0x00;
     	
		// Init time
		if (call I2C.write(I2C_START | I2C_STOP, 0xA2, sizeof(uint8_t),  
&buffer[0]) == SUCCESS) {
		}
		// write to control status 1
		if (call I2C.write(I2C_START | I2C_STOP, 0x00, sizeof(uint8_t),  
&buffer[0]) == SUCCESS) {
		}
		// init seconds to 15
		if (call I2C.write(I2C_START | I2C_STOP, 0x02, sizeof(uint8_t),  
&buffer[2]) == SUCCESS) {
		}
		
		// Read time
		if (call I2C.write(I2C_START | I2C_STOP, 0xA3, sizeof(uint8_t),  
&buffer[0]) == SUCCESS) {
			call Leds.led2On();
		}
		if (call I2C.read(I2C_START | I2C_STOP, 0x02, sizeof(uint8_t),  
&rbuffer[0]) == SUCCESS)
		//	call Leds.led1On();
		
		dateAndTime = rbuffer[0];
	}

	async event void I2C.readDone(error_t error, uint16_t addr, uint8_t  
length, uint8_t* data) {
		
	}
	async event void I2C.writeDone(error_t error, uint16_t addr, uint8_t  
length, uint8_t* data) {
		call Leds.led2On();
	}

I'm confused about addresses. I2C write address is 0xA2 and read  
address 0xA3.

How to just send 0xA2 to I2C like in pseudo code:
1 0 1 0  0 0 1 W	A2 		slave address 								(how to send it)?
0 0 0 0  0 0 0 0 	00 		word address 0, next bytes are data
0 0 0 0  0 0 0 0 	00 	00	 control/status1, no test modes or POR  
override 	(how this should be sent - it's little different from first  
line?)

Do I have to always send data to address 0xA2 and seconds address must  
be also in buffer[2] when I want to init it to for example 15?
Should I call:
buffer[2] = addr + init value (02+0xF)
call I2C.write(I2C_START | I2C_STOP, 0xA2, sizeof(uint8_t),  
&buffer[2]) == SUCCESS)

Any hints how PCF8563 should be used with TinyOS2 on Iris mote?


Andres Vahter

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