ADE7753 and SPI

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Swys

Joined: 22 Jul 2008
Posts: 11

23 Jun 2009 14:24 ade7753 spi speed

Hi all,

I am trying to get the SPI communication going with the ADE7753. For the microcontroller I am using a PIC18F452.

I am posting my code. I am sure that the physical connections are correct. Can anyone please check my code and tell me where I am going wrong, please? I've tried for hours now and I think I am starting to go mad....

Thanks!

Code:

//Initialize the SPI
void init_spi()
{
SSPEN = 0;          //Enable bit must be cleared to configure SPI

TRISC = TRISC | 0b00010000; //Setup the TRIS register

CKP = 0;          //IDLE state for clock is a low level
CKE = 0;          //Data transmitted on falling edge of clock
SMP = 0;          //Input data sampled at the middle of data output time

SSPCON1 = SSPCON1 | 0b00000010; //Speed: Fosc/64

SSPEN = 1;          //Enable the serial port
}

Code:

//Output one byte via SPI
//This function returns the data that may be present
//in the SSPBUF register. Otherwise returns 0
unsigned char spi_read_write(unsigned char data)
{
unsigned char readData = 0;

if (BF)
readData = spi_read();

SSPBUF = data;

return readData;
}

Code:

//Receive one byte via SPI
unsigned char spi_read()
{
while (!BF)
continue;

return SSPBUF;
}

Code:

//Test the SPI communication
void TestSPI()
{
char command = 0x3F + 0x80; //Read the die revision
ADE7753RESET = 1;
CS = 0;

init_spi();

spi_write(command);
_delay(90); //Delay for 90 clock cycles
char result = 0;

result = spi_read();

CS = 1;

putch(result); //Output the receive value on the UART
}