MikroC code using SPI Communication

[daggerdoi]

mikroc spi

can anyone help me make a MikroC code for communicating PIC16f877 and SA9904b(an Energy Meter IC) using SPI Communication.

i want to have a code for accessing a 10-bit register address..

i badly need ur help coz im having problems understanding MikroC language.. Coz im just a neophyte in making microcontroller related projects..

plss help me.. please. . .

thanks...

 

[FvM]

spi communication

This should work, according to my understanding of chip operation.

#define CS PORTC.F0 // just an example
long read_reg(char adr)
{
	union char_long {
		long l,
		char c[4]
	} result;

	CS = 1;
  Spi_Write(1);
  Spi_Write(adr | 0x80);
  result.c[2]=Spi_Read(0);
  result.c[1]=Spi_Read(0);
  result.c[0]=Spi_Read(0);
	CS = 0;
	// sign extension of negative register values
	if (result.c[2] & 0x80)
	  result.c[3]= 0xff;
	return result.l;
}

// CKP = 0, CKE =1, SMP = 0, SSPM = 0010
// MASTER_OSC_DIV16 may also work, depending on clock frequency
Spi_Init_Advanced(MASTER_OSC_DIV64, DATA_SAMPLE_MIDDLE, CLK_IDLE_LOW, HIGH_2_LOW);
TRISC.F0 = 0; // Init CS output
CS = 0;

Hardware SPI interface must be used, cause mikroC Software SPI has wrong clock phase. Documentation regarding SPI communication has drawing errors, so I hope to understand it correct.

 

[daggerdoi]

spi mikroc

thank you so much sir.. this would help a lot..

is this code used for accessing 10-bit register?

 

[FvM]

spi_read mikroc

This code is for reading SA9904 24-Bit data registers as documented. According to the datasheet, the chip has no 10 bit registers. It has 9 bits of address input, that is written as 16 bit zero-padded, as suggested.

 

[Tammam17]

mikroc

Hi FvM..

Im doing a similar project with the CS5461A energy IC from cirrus logic. I need to read the data registers of this IC using SPI. Im using PIC18F4580 with the MikroC compiler.

I was wondering if the code you posted could be used for this project. I am trying to modify your code for my application but I dont quite understand all of your code. What does the line Spi_Write(adr | 0x80); do? and why are you reading the registers three times ?

I would appreciate any help that you can give

thank you

 

[irangathathsara]

Re: spi communication

I also have a similar kind of problem. i.e. to send data from MAX1132 16bit ADC Chip to PIC 16F877A using SPI communication. can you please send me a sample code since i'm new to this. Thanx