Hi folks,
I am Sagar, Grad student at Georgia Tech. I'm developing a wireless application. I got a CC2530 ZDK kit. My goal is to transmit a signal wireless by a cc2530 module and recieve the same signal at the rx end and send it to the computer.
I went through the code ADC.c provided by TI's software examples. Here goes the code:
/******************************************************************************
* @fn adcSampleSingle
*
* @brief
* This function makes the adc sample the given channel at the given
* resolution with the given reference.
*
* @param uint8 reference
* The reference to compare the channel to be sampled.
* uint8 resolution
* The resolution to use during the sample (8, 10, 12 or 14 bit)
* uint8 input
* The channel to be sampled.
*
* @return int16
* The conversion result
*
******************************************************************************/
int16 adcSampleSingle(uint8 reference, uint8 resolution, uint8 channel)
{
int16 value;
ADC_ENABLE_CHANNEL(channel);
ADCIF = 0;
ADC_SINGLE_CONVERSION(reference | resolution | channel);
while(!ADCIF);
value = (ADCH << 8) & 0xff00;
value |= ADCL;
ADC_DISABLE_CHANNEL(channel);
// The variable 'value' contains 16 bits where
// bit 15 is a sign bit
// bit [14 .. 0] contain the absolute sample value
// Only the r upper bits are significant, where r is the resolution
// Resolution:
// 12 -> [14 .. 3] (bitmask 0x7FF8)
// 10 -> [14 .. 5] (bitmask 0x7FE0)
// 9 -> [14 .. 6] (bitmask 0x7FC0)
// 7 -> [14 .. 8] (bitmask 0x7F00)
return value;
}
Port 0 of cc2530 is used to take the analog inputs which are to be converted to digital. AIN7 pin is the AVdd(Analog reverence voltage). I'm using single ended ADC(not differential).