Hi,
I'm trying to use Msp430Adc12SingleChannel to continuously read data from
ADC input. Assuming that SMCLK runs at 1 Mhz, the jiffies value of 1000000
in configureSingleRepeat should give me about 1Hz sampling frequency. But I
notice that singleDataReady events are coming at a much faster rate. The
test code is given below. Am I doing something wrong? How can I control the
sampling frequency in the single channel repeat mode?
Thanks in advance,
Dmitry
*****
module AdcC {
uses {
interface Boot;
interface Leds;
interface Msp430Adc12SingleChannel as Adc;
interface Resource;
}
}
implementation {
uint8_t count = 0;
const msp430adc12_channel_config_t config = {
inch: TEMPERATURE_DIODE_CHANNEL,
sref: REFERENCE_AVcc_AVss,
ref2_5v: REFVOLT_LEVEL_NONE,
adc12ssel: SHT_SOURCE_SMCLK,
adc12div: SHT_CLOCK_DIV_1,
sht: SAMPLE_HOLD_4_CYCLES,
sampcon_ssel: SAMPCON_SOURCE_SMCLK,
sampcon_id: SAMPCON_CLOCK_DIV_1
};
event void Boot.booted() {
call Resource.request();
}
event void Resource.granted() {
if (call Adc.configureSingleRepeat(&config,1000000)==SUCCESS) {
call Adc.getData();
}
}
async event error_t Adc.singleDataReady(uint16_t data) {
count++;
call Leds.set(count);
return SUCCESS;
}
async event uint16_t * Adc.multipleDataReady(uint16_t *buffer, uint16_t
numSamples) {
return buffer;
}
}
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