hi peppe,
for the record, i did not write this application, adrian burns did. i
made a few latter-day mods to clean it up after creating a component for
all of the analog-digital setup and conversion functionality.
p_packet is a local variable used to walk the buffer that the bluetooth
radio will send; it was not meant to be visible elsewhere. the buffer
that it references is.
as for "calling" transferDone, you don't call events; they are signaled
from modules that are performing an operation to notify the receiving
code that something related to an interface that it uses has happened
(tinyos is an event-driven operating environment).
finally, this application works splendidly and has been in use --
deployed clinically -- for a number of years. to get the data from the
ECG, all you have to do is receive it over bluetooth on a host computer.
if you're looking for the two ECG channels, by reading the comments at
the top of the file, you'll see a detailed description of the radio
packet's contents, which includes the size and location of all of the
data produced by this application, in order to make it very simple to
parse the incoming data on the host side.
-steve
On 10/05/2011 06:55 AM, Peppe Scabellone wrote:
Hi , I was looking Steve Ayer's AccelECGC.nc file.
I need to get datas from ECG and as I can see in that file the real
datas are stored in p_packet array as you can see below:
/* copy all the data samples into the outgoing packet */
*p_packet++ = *p_ADCsamples++; //tx_packet[8]
*p_packet++ = *p_ADCsamples++; //tx_packet[10]
*p_packet++ = *p_ADCsamples++; //tx_packet[12]
*p_packet++ = *p_ADCsamples++; //tx_packet[14]
*p_packet = *p_ADCsamples; //tx_packet[16]
but this p_packet is never used in other part of the code.
I need the two channels of ECG stored in one array
uint16_t ecgData[2]
so if I call
async event void DMA0.transferDone(error_t success) {
if(current_buffer == 0){
call DMA0.repeatTransfer((void*)ADC12MEM0_, (void*)&sbuf1,
NBR_ADC_CHANS);
memcpy(ecgData, &sbuf1, sizeof(*sbuf1)*NBR_ADC_CHANS);
current_buffer = 1;
}
else {
call DMA0.repeatTransfer((void*)ADC12MEM0_, (void*)&sbuf0,
NBR_ADC_CHANS);
memcpy(ecgData, &sbuf0, sizeof(*sbuf1)*NBR_ADC_CHANS);
current_buffer = 0;
}
post preparePacket();
}
and the method
void preparePacket() {
uint16_t *p_packet, *p_ADCsamples, crc;
p_packet = (uint16_t *)&tx_packet[8];
if(current_buffer == 1) {
p_ADCsamples = &sbuf0[0];
}
else {
p_ADCsamples = &sbuf1[0];
}
/* copy all the data samples into the outgoing packet */
*p_packet++ = *p_ADCsamples++; //tx_packet[8]
*p_packet++ = *p_ADCsamples++; //tx_packet[10]
*p_packet++ = *p_ADCsamples++; //tx_packet[12]
*p_packet++ = *p_ADCsamples++; //tx_packet[14]
*p_packet = *p_ADCsamples; //tx_packet[16]
}
The Question is using these two methods I'll have the datas in ecgData
array? or I have to intercept p_packet?
Thank you.
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