Author Topic: UART, Ping))) and the Axon  (Read 1752 times)

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Offline MarkBrownTopic starter

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UART, Ping))) and the Axon
« on: August 29, 2008, 10:11:43 PM »
Not sure how many will care, but I am very happy to report that I not only have UART working, which is working by default anyways, but I also have the Ping))) working with my Axon and am sending the values to my PC.  I would like to thank Pomprocker for the tutorial, and Airman00 for the help with UART, as I was having problems initially.  The only thing I needed to do to the code from the tutorial was change the port form C to F and make sure the pin was 0, as that was the one I was using.

I love this site.

Mark
It is human nature to confuse genious with insanity

http://marksproject.blogspot.com/

Offline RobD

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Re: UART, Ping))) and the Axon
« Reply #1 on: August 30, 2008, 08:51:22 AM »
Nice!

I was trying to get that Ping))) to work once with a standalone 16F84A.  I gave up once I had transistors and diodes everywhere  :D


Offline MarkBrownTopic starter

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Re: UART, Ping))) and the Axon
« Reply #2 on: August 30, 2008, 05:04:38 PM »
I was asked for code snippets so I figured I would post it here in case anyone else wants it too.  Although I only made one small change to Pomprocker's code, I am including all the changes I made to get it working using the Axon code downloaded from the website.

Here is the Axon.c change, I only changed it because I didn't want to have to wait to push the button and I wanted to control the loop elsewhere:
Code: [Select]
/*********ADD YOUR CODE BELOW THIS LINE **********/

rprintf("Initialization Complete \r\n");

//wait until user pushes button
//while(!button_pressed());

reset_timer_0();
reset_timer_2();

control();

//while(1)
//{
//control();//use this for your code

//delay_cycles(100);//an optional small delay to prevent crazy oscillations
//}
/*********ADD YOUR CODE ABOVE THIS LINE **********/

Here is my function prototype and modification to call my function:
Code: [Select]
void PingSonar(void);

//enter your code in control here
void control(void)
{
PingSonar();

//photovore();//run photovore algorithm
//test_code();//various testing code for admin
}

Here is the meat of the code that does triggers and reads the Ping))):
Code: [Select]
int GetDistance(void)
{
int PingPin = 0;          // assign a pin to the Ping Sensor
int PingVal = 0;          // initialize and assign Ping Sensor Reading Value

PORT_ON(DDRF, PingPin);   // Switch PingPin to OUPUT
// ------Trigger Pulse--------------
PORT_OFF(PORTF, PingPin);   // Bring PingPin low before starting trigger pulse
delay_us(2);        //  Wait for 2 microseconds
PORT_ON(PORTF, PingPin);    // Bring PingPin High for 5us according to spec sheet.
delay_us(5);       // Wait for 5 microseconds
PORT_OFF(PORTF, PingPin);; //  Bring PingPin Low and standby
//--------End Trigger Pulse---------------------
FLIP_PORT(DDRF, PingPin);   // Switch PingPin to INPUT
loop_until_bit_is_set(PINF, PingPin);     // Loop until the the PingPin goes high  (macro found in sfr_def.h)
//clears timer, reset overflow counter
reset_timer_0();       //reset timer 0
loop_until_bit_is_clear(PINF, PingPin);     // Loop until the the PingPin goes low  (macro found in sfr_def.h)
//read timer0's overflow counter
//255 is count before overflow, dependent on clock
int elapsed_time=timer0GetOverflowCount()*255+TCNT0;
//   The PING))) returns a pulse width of 29.033 uS per centimeter
PingVal = elapsed_time;

return PingVal;
}

Mark Brown
It is human nature to confuse genious with insanity

http://marksproject.blogspot.com/

 


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