PM9603APE 查看數據表（PDF） - South African Micro Electronic Systems

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PM9603APE

SINGLE PHASE POWER/ENERGY METERING MODULE SPI INTERFACE

South African Micro Electronic Systems 

int prt, buffindex = 0;

PM9603AP

double convert_24bits(double value)

// This function will sort out the 24 bits of the register

values

{

if (fabs(value) > 0x7FFFFF)

{

if (value > 0)

value = (16777216-value) * (-1);

else

value = (16777216+value)* (1);

}

return(value);

}

void spi_wait(void)

// This function will wait for the specified period, very

short time

{

int ti;

for (ti = 1; ti < 1 ; ti++);

}

void spi_out(unsigned char value)

// Put value on the parallel port

{

int n;

portval = value;

outport(prt,(~portval));

// Remove the ~ if you dont use opto couplers

for(n=0 ; n< delay_time ; n++); // Specify the pulse

width

}

void spi_clock(void)

// This function will pulse CLK pin of spi port

{

spi_wait();

spi_out(portval | CLK_b); // or

spi_wait();

sames

11/18

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