HOW TO: Setup I/O pins on cc2530 ?

Dears,

If you want to use any pin of P0 as a GPIO, you need to set bit flag in P0SEL (bit with value 0 means GPIO function) and P0DIR (bit with value 0 means GPI and bit with value 1 means GPO).

When using the ADC, Port 0 pins must be configured as ADC inputs. Up to eight ADC inputs can be used.
To configure a Port 0 pin to be used as an ADC input, the corresponding bit in the APCFG register must be
set to 1. The default values in this register select the Port 0 pins as non-ADC input, i.e., digital
input/outputs.
The settings in the APCFG register override the settings in P0SEL.

Thanks for this !  Is there any documentation or code samples?? 

how do I use APCFG?  are any functions used, or just setting of these registers?

I did a search for APCFG in the TI code and no references... I don't see this used anywhere? :(

I need a code example how to setup P0_2 as ADC Input for example .... do you know how?

Thanks!

Dears,

You can download CC2530 user guild from http://www.ti.com/litv/pdf/swru191c.

You can refer to hal_adc.c in your ZStack. There is some API for you to use ADC easily.

Thanks - I've never seen this document.. I didn't realize hal_adc already did all the register stuff for us ... I'm getting funny values, but I think it's a soldering problem.

Another important question ..  I want to create a open/close sensor... the device will sleep and wake up when the pin changes state ..  YiKai. have you done this before?

Thanks for your help!

Yes, it is easy to create a open/close sensor. Just choose a pin as GPI and register ISR function for it.

Amazing!  I'll try that this week..

this temperature sensor is killing me ... I thought maybe it was a bad solder, but the values are always the same on different pins

I have a temp sensor outputting a stable 0.76V .. I call:

    value = HalAdcRead (HAL_ADC_CHANNEL_1, HAL_ADC_RESOLUTION_14);

value = 2000 ....  but I can't correlate this back to 0.76V with my calculation 

(2000 / 16384) * 1.15V = 0.14V ... not  0.76V

what am I doing wrong??

Thanks!

Dears,

I read that you mention about using P0_2 as your ADC input. Why do you use HAL_ADC_CHANNEL_1 in your HalAdcRead API? By the way, could you change the voltage of your ADC input to see if the ADC reading changes?

I've tested with a few pins because I burnt a few pads on the module haha .. I'm currently on ADC1 and getting similar results to the other pins, so it must be a code thing?

How can I change the ADC voltage please??  Is 1.15V default? I just assumed, I have no idea what the reference voltage is.

Thanks!

It is OK to use P0_1. What I mean is to change the input voltage to P0_1. For example, you can connect P0_1 to GND to see if the reading is almost 0. Or, connect P0_1 to other voltage (ex. 0.5V) to see if the reading changes. I would like to make sure that your reading will change when input voltage changes on P0_1.

OK I test ADC2 with 3.3V and GND.  I got 0 and 8191 (13-bit conversion?!)

Do you think this is a bug?  using 8191 in my calculation with a reference voltage of 3.0V seems to work ... does that make sense for an internal voltage?

value = (total / 8191.0) * 3.0 = 0.77V

are the ADCs dependant on the battery voltage?  should I bring the ref down to 1.25V??

Dears,

Care should be taken as the CC2530 ADC outputs all data in the 2s complement format, which means that HAL_ADC_RESOLUTION_14 will go from 0 to 8191 only.

So the value=(HalAdcRead/8191)*3=(2000/8191)*3=0.733

P.S. the highest measured value of HAL_ADC_REF_AVDD is 3V.

wow that solves that problem .. I was freaking out all day thinking my soldering was crap haha!!

what is the strategy for conversion with a battery .. is HAL_ADC_REF_AVDD guaranteed to be 3V all the time?   a 0.1V change makes the difference between 20 and 25 degrees in the formula!!

thank you for all your help!

Then, you need to change your reference from HAL_ADC_REF_AVDD to HAL_ADC_CHN_VDD3, which make the reference voltage is 1.15V.

Ok cool .. that's what I thought.  Do you know if HAL_ADC_CHN_VDD3 is a regulated (guaranteed) 1.15V ?  that would make for some stable sensing :)

Thanks!!

Hi Rob,

The 1.15v is stable (in some reasonable limits).

But what you mean by "some stable sensing"? :)

Thanks for all your help guys .. I'm learning so much and I'm getting good readings from my sensor.

A question about low power sensor strategies ... is it enough for the device to go to sleep (adc OFF) .. 3.3V is still being supplied to the TMP36 sensor the whole time.  is this OK?

or should I also add a shutdown function and kill the voltage to the sensor  when it's not being read?

Hi Rob,

What is the power consumption of the TMP36 in sampling/idle/sleep mode (if such modes exists)?

What is the power source in your case?

Hi Igor.

I don't think this sensor has those modes. it's just a passive sensor that outputs an analog voltage proportional to temperature.

http://www.analog.com/static/imported-files/data_sheets/TMP35_36_37.pdf

Some versions of this sensor (chip) have this shutdown functionality .. but I may have to do it myself with the cc.   Is the power usage small enough on these where I don't have to worry about it?

Dear Rob,

I read the datasheet of TMP36 and see the current consumption is low (< 50uA@2.7V~5.5V). I will suggest that you do not need to turn if off. Off course, it depends on you. If the battery life is critical, you can make the decision to turn it off when you do not use it.

Hi members!

I would like to write a simple code, I am using cc2530. The target is turn on a LED. I use Eclipse IDE, because my 30 days IAR IDE licence is overdue.

So, I have a LED on P1_0 and P1_1 but I can not able to set the pin as "output" and turn the led "high/on".

My code is bellow:

#include <hal_cc8051.h>
#include <hal_led.h>
void delay()
{
    int i,j;
    for(i=0;i<=100;i++);
    for(j=0;j<100;j++);
}
void main()
{
while(1)
    {

// P1DIR == 0x00;  This part in question

// P1_0 = 1; This part in question

    };
}

So what I missed or what is the problem with my code? Thanks for help!

Hi,

I'm not sure what is the purpose of the delay() function in your case. Anyhow:

Keep it as simple as possible:

#include <hal_cc8051.h>
 

void main(void)
{

P1SEL &= ~0x01; /* Set P1_0 as GPIO */
P1DIR |= 0x01; /* Set P1_0 as output */
P0_1 = 1;
while(1);

}

Just make sure hal_cc8051.h describes cc2530 and LED is active when P0_1 is HIGH.

Thanks your advice, I tried it, but I got 3 errors, so I have some problems with my eclipse. I will fix it and write again to you!

It seems hal_cc8051.h did not desribe correctly the CC2530 therefore I used SDCC 8051.h header file and  I amend it a little bit. I wrote a few new lines in:

__sfr __at (0xFE) P1DIR ;

__sfr __at (0xF4) P1SEL ;

I used P1_1=0; because my LED connected to +3V3. The built funcion is work, the eclipse generate a .hex file and I can upload it with smart RF Flash programer.

But the LED is not work :(
Any suggestion?

Hi,

Can you post here your code?

can some one tell me how to set up adc in zigbee board

P0_4 = 0;
P0_5 = 0;
P0_6 = 0;
P0_7 = 0;
while(1) {

PROCESS_WAIT_EVENT();

if(ev == PROCESS_EVENT_TIMER) {
etimer_reset(&et_blink);

val1 = val2 = val3 = val4 = 0;

val1 = PORT_READ(0, 4);
val2 = PORT_READ(0, 5);
val3 = PORT_READ(0, 6);
val4 = PORT_READ(0, 7); 

this is my current code can anyone tell whats wrong with it or what to add in it

That's good.