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How can I read a 16Bit Data register with SPI_READ???

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neurus

Joined: 31 Mar 2004
Posts: 23
Location: Switzerland

How can I read a 16Bit Data register with SPI_READ???

Posted: Fri May 21, 2004 2:06 am

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hi

I'm triyng to read the ADC AD7705, which it has a dataregister from 16 Bits. I'm working with CCS and 18F252.
Here the code:

Code:

long int read_adc_word()
{
long data,data1;

output_low(ADC_CS);
data1 = spi_read(data);
output_high(ADC_CS);
return data1;
}

The comand SPI-READ return only 8Bits. I'm beginner in C, can help me anybody???

Aloha, Pablo.

ckielstra

Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

Posted: Fri May 21, 2004 2:30 am

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Try something like:

Code:

long int read_adc_word()
{
int8 data_low,data_high;
long data16;

output_low(ADC_CS);
data_low = spi_read(0);
data_high= spi_read(0);
output_high(ADC_CS);

data16 = make16(data_high, data_low);
return data16;
}

I don't know the AD7705, so maybe you have to swap reading the high and low bytes.

neurus

Joined: 31 Mar 2004
Posts: 23
Location: Switzerland


Posted: Fri May 21, 2004 5:21 am

thanks for your answer. Aloha Pablo

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