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khaled_23
Joined: 21 Apr 2015
Posts: 2
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| MCP3424 with pic18f2455 |
 Posted: Tue Apr 21, 2015 5:43 pm |
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I'm working to get data from mcp3424 but i get nothing.
PLZ help me with this !!! I'm stuck on it 
| Code: |
#use i2c(Master, scl=PIN_B1,sda=PIN_B0,slow)
//#use i2c(i2c1,MASTER,SCL=Device_SCL, SDA=Device_SDA,FAST=400000, FORCE_HW)
//#use i2c(master, sda=PIN_J1, scl=PIN_J0,SLOW)
#use rs232(baud=9600 , UART1)
#define ADCRead 0xDB
#define ADCWrite 0xDA
void main()
{
int8 HighBuffer,LowBuffer,Config,ack=0;
float value;
while(1){
i2c_start();
ack = i2c_write(ADCWrite); // Address factory set at 1101 = 0xD
if(ack)
printf("Feil!!");
i2c_write(0x8B); //16bit mode, Gain = 8, one shot sample mode
i2c_stop();
delay_ms(5);// Wait for conversion to be finished in oneshot mode
i2c_start();
i2c_write(ADCRead); //Set Read/Write to 1 for read
HighBuffer = i2c_read(1);
LowBuffer = i2c_read(1);
Config = i2c_read(1);
printf("Config: %x\n\r",Config);
while((Config&0x80)){Config = i2c_read(1);}; // Wait for finish
i2c_stop(); // When conversion finished
delay_ms(5);
i2c_start(); // Read new value
i2c_write(ADCRead); //Set Read/Write to 1 for read
HighBuffer = i2c_read(1);
LowBuffer = i2c_read(1);
Config = i2c_read(0);
i2c_stop();
delay_ms(5);
HighBuffer = i2c_read(1);
LowBuffer = i2c_read(1);
i2c_stop();
delay_ms(5);
Value = make16(HighBuffer,LowBuffer);
printf("Lading Sol:%f A\n\r",value);
}
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19499
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| Posted: Wed Apr 22, 2015 1:09 am |
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First, what PIC?.
What voltage is the system running?.
What I2C pull-ups are you using?.
Then before trying to talk to the chip, use PCM_Programmers I2C scanner program in the code library.
Only progress to trying to actually driving the chip once this has seen the device.
The addresses you are using correspond to Adr0, being pulled up to the supply, and Adr1, being left floating. Is this how you have them wired?. |
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khaled_23
Joined: 21 Apr 2015
Posts: 2
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| Posted: Wed Apr 22, 2015 4:56 am |
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thank you Ttelmah 
i use PIC 18F2455 and the voltage 5V and i use 4.9K resistor pull-up |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Apr 22, 2015 10:02 am |
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Run the i2c bus scanner program and see if it finds the mcp3424:
http://www.ccsinfo.com/forum/viewtopic.php?t=49713
And see what i2c slave address it reports.
After you confirm the correct mcp3424 slave address is in use,
then fix your code.
The last i2c_read() before the stop always needs to do a NAK.
This means the parameter should be a 0. Fix the line shown below in bold:
| Quote: |
i2c_start();
i2c_write(ADCRead); //Set Read/Write to 1 for read
HighBuffer = i2c_read(1);
LowBuffer = i2c_read(1);
Config = i2c_read(1);
printf("Config: %x\n\r",Config);
while((Config&0x80)){Config = i2c_read(1);}; // Wait for finish
i2c_stop();
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The mcp3424 data sheet shows this on page 23.
http://ww1.microchip.com/downloads/en/DeviceDoc/22088c.pdf
It says (regarding continuing to read bytes):
| Quote: | To continue: ACK by Master
To end: NAK by Master
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And then what is this ? You have some fragments of an i2c operation.
You don't have a start, and you don't send the slave address, and you
don't have a NAK:
| Quote: | HighBuffer = i2c_read(1);
LowBuffer = i2c_read(1);
i2c_stop(); |
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lucasromeiro
Joined: 27 Mar 2010
Posts: 167
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| Help |
| Posted: Thu May 07, 2015 9:18 pm |
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I'm having the same problem, I need to use this ADC but I found library.
I could not make it work!
Can you help me? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu May 07, 2015 11:41 pm |
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Look for the mcp342x.c driver file in your CCS directory:
| Code: | | c:\program files\picc\drivers\mcp342x.c 1/28/2013 |
Based on the file date, I think it probably first came out with vs. 4.141 of
the compiler. It's also in vs. 5.045. The start of the file says:
| Code: |
//// Driver for MCP342X Delta-Sigma A/D Converter ////
////
//// Driver for Microchip's MCP3421, MCP3422, MCP3423, MCP3424,
//// MCP3425, MCP3426, MCP3427 and MCP3428 Delta-Sigma A/D
//// Converters.
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lucasromeiro
Joined: 27 Mar 2010
Posts: 167
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| HELP |
| Posted: Fri May 08, 2015 9:56 am |
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| PCM programmer wrote: | Look for the mcp342x.c driver file in your CCS directory:
| Code: | | c:\program files\picc\drivers\mcp342x.c 1/28/2013 |
Based on the file date, I think it probably first came out with vs. 4.141 of
the compiler. It's also in vs. 5.045. The start of the file says:
| Code: |
//// Driver for MCP342X Delta-Sigma A/D Converter ////
////
//// Driver for Microchip's MCP3421, MCP3422, MCP3423, MCP3424,
//// MCP3425, MCP3426, MCP3427 and MCP3428 Delta-Sigma A/D
//// Converters.
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Hello Friend!
Thank you for your help !!
I managed to find the library version (5008).
I do not know if this version has problems, but I have a big problem.
The library works well for converting 12bits.
When set up for converting 16 or 18bits generates much delay in processing when my sim to make the conversion (read_adc_mcp ();).
In Proteus gives notice: (Simulation is not running in real time due to excessive CPU load)
In converting 12bits this error does not appear and generates no delay in my code.
My code is simple.
I did only one test to convert and display the serial!
| Code: |
set_adc_channel_mcp (0);
fo = read_adc_mcp ();
printf ("\ r \ n 1:% ld", fo);
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Would you help me?
I do not understand the reason for this problem. Does the library version?
I noticed that the library is incomplete, missing the command: read_adc_value_mcp () |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri May 08, 2015 12:26 pm |
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| Quote: | set_adc_channel_mcp (0);
fo = read_adc_mcp ();
printf ("\ r \ n 1:% ld", fo); |
This code is not sufficient to show what you are doing.
Post a complete test program that compiles without errors.
The program should have an:
#include for the PIC, #fuses, #use delay, other #use() statements,
then any global variables,
then #define statements to setup the mcp342x configuration,
then the #include <mcp342x.c> line,
then main(),
and then inside main(), call the routines in the mcp342x.c driver file.
Do not post the mcp342x.c driver. I already have it. |
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lucasromeiro
Joined: 27 Mar 2010
Posts: 167
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| Complete code: |
| Posted: Fri May 08, 2015 12:30 pm |
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| PCM programmer wrote: | | Quote: | set_adc_channel_mcp (0);
fo = read_adc_mcp ();
printf ("\ r \ n 1:% ld", fo); |
This code is not sufficient to show what you are doing.
Post a complete test program that compiles without errors.
The program should have an:
#include for the PIC, #fuses, #use delay, other #use() statements,
then any global variables,
then #define statements to setup the mcp342x configuration,
then the #include <mcp342x.c> line,
then main(),
and then inside main(), call the routines in the mcp342x.c driver file.
Do not post the mcp342x.c driver. I already have it. |
The complete code:
| Code: |
#include <18F2685.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES HS //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES NOPROTECT //Code not protected from reading
#FUSES BROWNOUT //Reset when brownout detected
//#FUSES BORV20 //Brownout reset at 2.0V
#FUSES NOPUT //No Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES LVP //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES PBADEN //PORTB pins are configured as analog input channels on RESET
#FUSES BBSIZ4K //4K words Boot Block size
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES LPT1OSC //Timer1 configured for low-power operation
#FUSES NOMCLR //Master Clear pin used for I/O
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#include "mcp3424.c"
int32 flo=0;
void main()
{
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF|ADC_TAD_MUL_0);
setup_spi(SPI_SS_DISABLED);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
setup_vref(FALSE);
adc_init();
printf("inicio");
While(1){
//flo=read_adc_value_mcp(2.048);
set_adc_channel_mcp(0);
flo=read_adc_mcp();
printf("\r\n 1: %ld",flo);//Exibir
delay_ms(1000);
set_adc_channel_mcp(1);
flo=read_adc_mcp();
printf("\r\n 2: %ld",flo);//Exibir
delay_ms(1000);
set_adc_channel_mcp(2);
flo=read_adc_mcp();
printf("\r\n 3: %ld",flo);//Exibir
delay_ms(1000);
set_adc_channel_mcp(3);
flo=read_adc_mcp();
printf("\r\n 4: %ld",flo);//Exibir
delay_ms(1000);
}
} |
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lucasromeiro
Joined: 27 Mar 2010
Posts: 167
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| Posted: Fri May 08, 2015 1:01 pm |
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You need something else?
I think the problem is in the library (mcp3424.c) of Mihas compiler version (5008). |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri May 08, 2015 1:25 pm |
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| Quote: |
In Proteus gives notice: (Simulation is not running in real time due to excessive CPU load)
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This is a common problem with the Isis simulator. Google for this:
| Quote: | | Proteus OR Isis "in real time due to excessive CPU load" |
I suggest that you test your project in real hardware. |
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lucasromeiro
Joined: 27 Mar 2010
Posts: 167
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| Posted: Fri May 08, 2015 1:32 pm |
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| PCM programmer wrote: | | Quote: |
In Proteus gives notice: (Simulation is not running in real time due to excessive CPU load)
|
This is a common problem with the Isis simulator. Google for this:
| Quote: | | Proteus OR Isis "in real time due to excessive CPU load" |
I suggest that you test your project in real hardware. |
I got it.
but when I read 12bits is not it.
Occurs only when phaco reading of 16 or 18bits.
I found it very strange.
In other simulations using i2c other devices that does not occur.
The library may have a problem.
Because it already found a problem, not shown to function: read_adc_value_mcp () |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri May 08, 2015 2:14 pm |
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| Quote: | I think the problem is in the library (mcp3424.c) of my compiler version (5008).
|
I compared the mcp342x.c files between compiler versions 5.008 and
5.045 and they are identical.
| Quote: | | The library may have a problem. |
Or the Isis model for the mcp3424 may have a problem in 16-bit or
18-bit mode. We can not work on Isis problems on the CCS forum.
Please use real hardware. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19499
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| Posted: Sat May 09, 2015 7:34 am |
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The warning is common with Isis, if maths gets complex.
It's a warning, not an error. Just says that timings will be wrong.
When you switch up to 18bit mode, the amount of data being moved increases, the variable sizes double, and the amount of maths increases. Isis just can't cope. |
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