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Guest_Me
Guest
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| ex_ad12.c |
 Posted: Wed Oct 20, 2004 3:23 am |
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| Code: | /////////////////////////////////////////////////////////////////////////
//// EX_AD12.C ////
//// ////
//// This program will read two A/D channels and display the ////
//// results as both a voltage and raw hex number over the RS-232. ////
//// A reading is taken every second. This can be done using either ////
//// the LTC1298 chip or the MCP3208 chip. ////
//// ////
//// Configure the CCS prototype card as follows: ////
//// ////
//// Using the LTC1298: ////
//// LTC1298 Protoboard ////
//// 1 50 B3 ////
//// 2 9 analog-1 ////
//// 3 10 analog-2 ////
//// 4 27 gnd ////
//// 5 49 B2 ////
//// 6 48 B1 ////
//// 7 47 B0 ////
//// 8 28 +5V ////
//// ////
//// Using the MCP3208: ////
//// MCP3208 Protoboard ////
//// 1 9 analog-1 ////
//// 2 10 analog-2 ////
//// 3..8 Not Connected ////
//// 9 27 gnd ////
//// 10 50 B3 ////
//// 11 49 B2 ////
//// 12 48 B1 ////
//// 13 47 B0 ////
//// 14 27 gnd ////
//// 15 28 +5V ////
//// 16 28 +5V ////
//// ////
//// See additional connections below. ////
//// ////
//// Using the MCP3208 requires changing the #include <LTC1298.C> ////
//// to #include <MCP3208.C> ////
//// ////
//// This example will work with the PCB, PCM and PCH compilers. ////
//// The following conditional compilation lines are used to ////
//// include a valid device for each compiler. Change the device, ////
//// clock and RS232 pins for your hardware if needed. ////
/////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS ////
//// C compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, ////
//// reproduction or distribution is permitted without written ////
//// permission. Derivative programs created using this software ////
//// in object code form are not restricted in any way. ////
/////////////////////////////////////////////////////////////////////////
#if defined(__PCB__)
#include <16c56.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2) // Jumpers: 11 to 17, 12 to 18
#elif defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
#endif
#include <ltc1298.c>
void display_data( long int data ) {
char volt_string[6];
convert_to_volts( data, volt_string );
printf(volt_string);
printf(" (%4lX)",data);
}
void main() {
long int value;
adc_init();
printf("Sampling:\r\n");
do {
delay_ms(1000);
value = read_analog(0);
printf("\n\rCh0: ");
display_data( value );
value = read_analog(1);
printf(" Ch1: ");
display_data( value );
} while (TRUE);
} |
hey guys, this is an example from CCS. this makes it able to use an extern 12-Bit ADC. my question is, can i use this code for 16f628 also?
regards,
guest_me |
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dvsoft
Joined: 28 Nov 2003
Posts: 46
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| Posted: Wed Oct 20, 2004 5:48 am |
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bonjour,
Yes you can
but you must set the correct pin for the extern ADC
in file ltc1298.c
| Code: |
#ifndef ADC_CS
#define ADC_CLK PIN_B0
#define ADC_DOUT PIN_B1
#define ADC_DIN PIN_B2
#define ADC_CS PIN_B3
#endif
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ANd selecte the correct pin for the UART
Alain |
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Guest
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| Posted: Wed Oct 20, 2004 7:25 am |
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| dvsoft wrote: | bonjour,
Yes you can
but you must set the correct pin for the extern ADC
in file ltc1298.c
| Code: |
#ifndef ADC_CS
#define ADC_CLK PIN_B0
#define ADC_DOUT PIN_B1
#define ADC_DIN PIN_B2
#define ADC_CS PIN_B3
#endif
|
ok thanks, but do really need the CS pin? or DIN?
ANd selecte the correct pin for the UART
Alain |
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Guest
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| Posted: Wed Oct 20, 2004 7:33 am |
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| dvsoft wrote: | bonjour,
Yes you can
but you must set the correct pin for the extern ADC
in file ltc1298.c
| Code: |
#ifndef ADC_CS
#define ADC_CLK PIN_B0
#define ADC_DOUT PIN_B1
#define ADC_DIN PIN_B2
#define ADC_CS PIN_B3
#endif
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ANd selecte the correct pin for the UART
Alain |
ok thanks, but do really need the CS pin? or DIN? |
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Guest
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| Posted: Wed Oct 20, 2004 7:39 am |
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and what signal should i connect with the RX and TX pins?
DOUT of ltc1298 --> RX of PIC16f628?
hmm im so confused. |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Wed Oct 20, 2004 9:09 am |
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The Rx & Tx are for RS232 data. The example program prints the data to a terminal. If you plan on hooking up the PIC to a PC to look at the data, then you will need a RS232 chip and connect it to the PIC.
| Quote: | | but do really need the CS pin? or DIN? |
DIN - Yes, it is for writing data to the device such as for selecting then channel
CS - is chip select. You can probably just tie the CS of the ltc1298 low and enable it all the time. I would check the datasheet just to make sure that by selecting it that it doesn't do something like stop doing convesions. |
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Guest
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| Posted: Wed Oct 20, 2004 2:37 pm |
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| Mark wrote: | The Rx & Tx are for RS232 data. The example program prints the data to a terminal. If you plan on hooking up the PIC to a PC to look at the data, then you will need a RS232 chip and connect it to the PIC.
| Quote: | | but do really need the CS pin? or DIN? |
DIN - Yes, it is for writing data to the device such as for selecting then channel
CS - is chip select. You can probably just tie the CS of the ltc1298 low and enable it all the time. I would check the datasheet just to make sure that by selecting it that it doesn't do something like stop doing convesions. |
k thanks,
but i cant still imagine what i need the DIN pin for. |
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bonjour?
Guest
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| bonjour? |
| Posted: Wed Oct 20, 2004 2:48 pm |
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What's this bonjour crap?  |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Wed Oct 20, 2004 5:20 pm |
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| Quote: | | but i cant still imagine what i need the DIN pin for. |
Uh, data in? Did ya look at the driver file at all? See where they use the DIN to setup to read values back. |
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