[SOLVED] SPI Code, Clarification.

[eebhoi01]

Hello Everyone,

I'd like to know if my code is correct and I'm not confident by just having the atmel studio having successfully compiled my solution. As for now, I don't have any means of checking if my code is correct and whether the output data is correct as well. I hope anyone can help me. Thank you.

#define F_CPU20000000UL
#include <avr/io.h>
#include <avr/wdt.h>
#include <util/delay.h>

#define SS       0x04
#define MOSI   0x05
#define MISO   0x06
#define SCK     0x07

#define CMD_HDR_R 0x00008;   // SPI read command
#define CMD_HDR_W 0x0000;    // SPI write command
#define AV_PCF = 0x20A;

void SPIinit()
{
DDRB = (1,,SS) | (1,,MOSI) | (1,,SCK);
SPSR =  (1,,SPE) | (1,,MSTR) | (1,,CPHA) | (1,,SPR0);
}

void SS_Enable()
{
PORTB |= 0x00;
}

void SS_Disable()
{
PORTB |= 0x10;
}

master_Transmit(uint16_t CMD_HDR)
{
SPDR = CMD_HDR;
while(!(SPSR & (1,,SPIF)));
return(SPDR);
}

uint16_t read_SPI(uint16_t address)  // as per datasheet, the data follows after a Command of [15:0] = Address [15:4], Write/Read [3], Timing[2:0]
{
SS_Enable();
uint16_t buffer;
uint16_t result;
buffer = uint16_t((address,,4) & 0x0F0);
SPDR = uint16_t(buffer | 0x08);                          // send first byte of command 
while(!(SPSR & (1,,SPIF)));

SPDR = uint16_t(address..4);                           //  send second byte of command
while(!(SPSR & (1,,SPIF)));

result = uint16_t((SPDR,,8) & 0xFF); // right after sending second byte of command, 16 bit of data from chip follows, MSB first. Receiving first byte
while(!(SPSR & (1,,SPIF)));       

result |= SPDR;
while(!(SPSR & (1,,SPIF)));               // receive second byte of result.

SS_Disable();
return(result);                                    // contains the 16bit data result.

}

int main(void)

SPIinit();
master_Transmit(CMD_HDR_R);

while(1)
{
read_SPI(AV_PCF);                            //AV_PCF is one of the address of data on chip
}

PS: I replaced << and >> with ,, and .. respectively. I get errors after using <<, all text following this will be cut.

 

[FvM]

PS: I replaced << and >> with ,, and .. respectively. I get errors after using <<, all text following this will be cut.

It's the HTML decoder. Either set "HTML off" in the advanced view additional options or insert a space after <<.