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Jongnonkuk
Joined: 20 Jan 2011
Posts: 8
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| PIC16F877 and MCP3909 help me! |
 Posted: Thu Jan 20, 2011 2:28 am |
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I try to connect MCP3909 with SPI function but it isn't work!
I link Avdd, Dvdd pin to +5V and AGND, DGND pin to 0V. Is it true?
And link G0,G1 to 0V.
| Code: |
#include "16f877.h"
#fuses HS,NOWDT,PROTECT,NOLVP
#use delay(clock=10000000)
#use rs232(baud=9600,xmit=PIN_A0,STREAM = LCD,INVERT)
#use SPI(DO = PIN_C2,DI = PIN_C3,CLK = PIN_C1,BITS = 8,MSB_FIRST,SAMPLE_RISE,stream = spiNa)
#define CS PIN_C0
void main(void)
{
int a;
int input=0;
char i;
set_tris_c(0b00001000); //set port
setup_spi(SPI_MASTER | SPI_H_TO_L); //set SPI mode
output_low(CS);
spi_xfer(spiNa,0b10100100); // write mode
output_high(CS);
while(1)
{
output_low(CS);
if(spi_data_is_in())
{
input =spi_xfer(spiNa);
}
output_high(CS);
fputc(0xFE,LCD);fputc(0x01,LCD);fprintf(LCD,"Earth");
fputc(0xFE,LCD);fputc(0xC0,LCD);fprintf(LCD,"ch0: %d",input);
delay_ms(600);
}
}
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Result on LCD is
What wrong? 
Everybody help me, please... ><! |
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Jongnonkuk
Joined: 20 Jan 2011
Posts: 8
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| Posted: Fri Jan 21, 2011 1:59 am |
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| so sad -.- |
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Jongnonkuk
Joined: 20 Jan 2011
Posts: 8
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| Posted: Tue Jan 25, 2011 1:46 am |
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No one helps me.
help me, please................................................ |
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Jongnonkuk
Joined: 20 Jan 2011
Posts: 8
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| Posted: Tue Jan 25, 2011 1:47 am |
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Code new: (not work again -.-)
| Code: |
#include "16f877.h"
#fuses HS,NOWDT,PROTECT,NOLVP
#use delay(clock=10000000)
#use rs232(baud=9600,xmit=PIN_A0,STREAM = LCD,INVERT)
#define CS PIN_C0
#define SCK PIN_C1
#define SDO PIN_C2
#define SDI PIN_C3
#define MCLR PIN_C4
void clockdata(unsigned char bits_in);
void writedata(unsigned char data_in);
void main(void)
{
char TextBuff[16];
int16 In;
int16 ch0=0,ch1=0;
char i,x=1;
set_tris_c(0b00001000); //set port
output_bit(CS,1); // Disable chip select
output_bit(MCLR,1);
writedata(0b10101100);
while(1)
{
output_bit(CS,0); // Active chip select
In = 0;
output_bit(SCK,1); // make clock high first
for(i=1;i<=16;i++)
{
output_bit(SCK,0);
In <<=1;
In = In | (input(SDI) & 0x01);
output_bit(SCK,1);
}
ch0 = In;
In = 0;
for(i=1;i<=16;i++)
{
output_bit(SCK,0);
In<<=1;
In = In | (input(SDI) & 0x01);
output_bit(SCK,1);
}
ch1 = In;
output_bit(CS,1); // Disable chip select
fputc(0xFE,LCD);fputc(0x01,LCD);fprintf(LCD,"Earth");
fputc(0xFE,LCD);fputc(0xC0,LCD);fprintf(LCD,"ch0: %Ld",ch0);
fputc(0xFE,LCD);fputc(0x94,LCD);fprintf(LCD,"ch1: %Ld",ch1);
delay_ms(1000);
}//while(1) ...end
}
void writedata(unsigned char data_in)
{
output_bit(MCLR,0); //chip Reset
delay_us(2);
output_bit(MCLR,1);
delay_us(1);
output_bit(CS,0); // Active chip select
output_bit(SCK,0); // make clock low first
clockdata(data_in); // Clock in data bits.
output_bit(CS,1); // Disable chip select
}
void clockdata(unsigned char bits_in)
{
int bitcnt;
for (bitcnt=8; bitcnt>0; bitcnt--)
{
output_bit(SCK,1); // clock // Set Clock Idle level LOW.
if ((bits_in&0x80)==0x80) {output_bit(SDO,1);} // PCD8544 clocks in the MSb first.
else {output_bit(SDO,0);}
output_bit(SCK,0); // clock // Data is clocked on the rising edge of SCK.
bits_in=bits_in<<1; // Logical shift data by 1 bit left.
}
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Jan 25, 2011 3:07 pm |
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The reason that no one gives you a reply, is because this is a complicated
chip and no one wants to write the driver for you. I've looked at it two
times recently, and I don't have the time to write the driver for you. |
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Jongnonkuk
Joined: 20 Jan 2011
Posts: 8
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| Posted: Tue Jan 25, 2011 7:53 pm |
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good answer. 
thank. |
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temtronic
Joined: 01 Jul 2010
Posts: 9163
Location: Greensville,Ontario
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| Posted: Tue Jan 25, 2011 9:38 pm |
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I've seen worse (harder) chips to get 'online'. Everything you need is in the data sheet, looks like SPI mode 1 for communications.
Writing a driver isn't that much of a challenge but too bad it's not available in a DIP package, far easier for my old eyes to breadboard and tinker with !
Sure looks like board layout would be 'fun', maybe Microchip has a 'test board' available ? If not, wait a week or two, someone will once they see the potential for the chip. |
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