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Other Parts Discussed in Thread: CC2540
Hi Community Members and TI employees,
I've got a couple of enquiries here:
1. The SimpleBLE Demo Application of CC2540 DK can only demonstrate sending one byte of data at a time. Does this mean the effective data length per packet (seen from TI's Packet Sniffer) is only ONE BYTE?
2. In terms of coding in C language, how to realise sending a text file in the attachment from Slave CC2540 Module and then transfer to Master CC2540 Module?
Regards,
Hi Daniel,
Daniel Liu said:1. The SimpleBLE Demo Application of CC2540 DK can only demonstrate sending one byte of data at a time. Does this mean the effective data length per packet (seen from TI's Packet Sniffer) is only ONE BYTE?
That is not correct. You can send up to 4 notifications/indications per connection event, where each can contain up to 20 byte. So with a low connection interval (~10ms) you can send up to 80KB/s
Daniel Liu said:2. In terms of coding in C language, how to realise sending a text file in the attachment from Slave CC2540 Module and then transfer to Master CC2540 Module?
This is highly depended of how much text you want to send. You would have to buffer the data somewhere before and after the transmission. Could you describe more what kind of text you would like to send?
BR
Hi Nick,
Thanks for the reply. Glad to have an opportunity to talk to TI's staff.
Sorry, I forgot to include the text file.
// Start Time: 0 // Sample rate: 100.0Hz // Scenario: 5.9 // Firmware Version: 2.6.1 Counter Temperature Acc_X Acc_Y Acc_Z Gyr_X Gyr_Y Gyr_Z Mag_X Mag_Y Mag_Z Roll Pitch Yaw AnalogIn_1 AnalogIn_2 31436 0.00 -0.333117 9.467282 -2.555237 -0.005013 -0.026711 -0.008481 0.046978 0.628360 -0.648472 105.145493 2.010289 -80.986580 0 0 31437 0.00 -0.310348 9.482548 -2.562759 -0.006816 -0.028514 -0.004904 0.049285 0.630327 -0.651331 105.142212 2.015929 -80.999229 0 0 31438 0.00 -0.310250 9.475011 -2.555179 -0.011358 -0.023141 -0.004849 0.048844 0.628924 -0.647185 105.135963 2.020574 -81.006882 0 0 31439 0.00 -0.340742 9.467246 -2.524627 -0.010497 -0.018652 0.002284 0.049287 0.629607 -0.651048 105.130722 2.020746 -81.015152 0 0 31440 0.00 -0.356048 9.467123 -2.524619 -0.010632 -0.001563 0.005897 0.048984 0.630502 -0.648180 105.125252 2.016219 -81.014313 0 0 31441 0.00 -0.402404 9.504479 -2.508935 -0.010695 0.003822 0.013047 0.048576 0.627881 -0.651340 105.120270 2.007090 -81.011749 0 0 31442 0.00 -0.432581 9.466498 -2.532227 0.000422 -0.030307 -0.005865 0.046252 0.629381 -0.648323 105.120636 2.013366 -81.027550 0 0 31443 0.00 -0.432056 9.421222 -2.555607 -0.007659 -0.030341 -0.013816 0.048567 0.629616 -0.651047 105.116882 2.024249 -81.039886 0 0 31444 0.00 -0.432392 9.451419 -2.524718 -0.033818 -0.030480 -0.001102 0.046671 0.630835 -0.646457 105.097595 2.027912 -81.053177 0 0 31445 0.00 -0.416878 9.436482 -2.494263 -0.013810 -0.051974 -0.008474 0.046837 0.629640 -0.650900 105.089859 2.039099 -81.078300 0 0 31446 0.00 -0.371339 9.467011 -2.509308 -0.002956 -0.065408 0.012782 0.047109 0.630245 -0.647319 105.087494 2.040287 -81.113159 0 0 31447 0.00 -0.333097 9.467301 -2.532283 -0.019208 -0.059177 0.004034 0.046831 0.630082 -0.649896 105.076439 2.045620 -81.144127 0 0 31448 0.00 -0.294686 9.452493 -2.570703 -0.015757 -0.042955 0.017414 0.045960 0.629108 -0.646892 105.067154 2.040890 -81.168686 0 0 31449 0.00 -0.332781 9.437085 -2.586126 -0.004985 -0.033906 0.005756 0.046547 0.629647 -0.650470 105.064743 2.041476 -81.185928 0 0 31450 0.00 -0.332781 9.437085 -2.586126 -0.019395 -0.033977 0.003212 0.045085 0.630571 -0.646025 105.053627 2.043262 -81.203079 0 0 31451 0.00 -0.355718 9.436919 -2.563159 -0.003440 -0.001522 0.014743 0.046258 0.629654 -0.650183 105.052689 2.034050 -81.203728 0 0 31452 0.00 -0.424585 9.436370 -2.555469 -0.010490 -0.019563 0.005846 0.046525 0.631127 -0.646312 105.046944 2.032230 -81.211784 0 0 31453 0.00 -0.416723 9.421371 -2.525011 -0.007743 -0.023151 0.002244 0.046972 0.630514 -0.649751 105.043182 2.033190 -81.222549 0 0 31454 0.00 -0.416619 9.413840 -2.509779 -0.017492 -0.042995 -0.001288 0.046389 0.629968 -0.647032 105.033005 2.038800 -81.243668 0 0 31455 0.00 -0.370976 9.436840 -2.509592 -0.024703 -0.044822 0.002338 0.046107 0.630242 -0.649178 105.019096 2.042945 -81.266449 0 0 31456 0.00 -0.355550 9.421821 -2.578604 -0.010357 -0.037538 0.005793 0.044653 0.631146 -0.646881 105.013077 2.043818 -81.286713 0 0 31457 0.00 -0.309655 9.422173 -2.601584 -0.006863 -0.023112 0.004019 0.045814 0.630828 -0.648603 105.009811 2.043796 -81.297722 0 0 31458 0.00 -0.324828 9.414544 -2.555739 0.007553 -0.019452 -0.004125 0.044360 0.631591 -0.646020 105.014465 2.047472 -81.305374 0 0 31459 0.00 -0.370640 9.406643 -2.540481 -0.006842 -0.023135 0.002234 0.044668 0.630254 -0.649891 105.011215 2.048440 -81.316132 0 0 31460 0.00 -0.393611 9.406445 -2.555771 0.011207 -0.026645 0.000280 0.045515 0.631285 -0.646310 105.017792 2.050746 -81.327301 0 0 31461 0.00 -0.386022 9.414075 -2.525099 0.014923 -0.039225 -0.006919 0.045820 0.629815 -0.648893 105.026741 2.059190 -81.345612 0 0 31462 0.00 -0.332390 9.406940 -2.555805 0.010494 -0.050026 -0.006909 0.043649 0.630434 -0.647312 105.032478 2.068952 -81.371033 0 0 31463 0.00 -0.301857 9.414742 -2.540449 0.007661 -0.033845 -0.003275 0.045099 0.629968 -0.648891 105.037354 2.074562 -81.386902 0 0 31464 0.00 -0.240949 9.437826 -2.586178 0.009292 -0.015824 0.005674 0.043933 0.631584 -0.647451 105.043015 2.072280 -81.393532 0 0 31465 0.00 -0.248700 9.445301 -2.593754 0.007350 0.000358 0.012867 0.045674 0.630534 -0.649463 105.048294 2.063811 -81.392853 0 0 31466 0.00 -0.279381 9.452617 -2.570712 0.002896 -0.000569 -0.006701 0.043932 0.631158 -0.646594 105.050667 2.066109 -81.389709 0 0 31467 0.00 -0.340497 9.444592 -2.555446 0.003640 0.018310 0.004039 0.044821 0.629377 -0.650897 105.054222 2.059826 -81.377777 0 0 31468 0.00 -0.401459 9.421456 -2.570927 0.009114 0.005729 0.019996 0.044935 0.631444 -0.645449 105.060135 2.046414 -81.374405 0 0 31469 0.00 -0.432197 9.436346 -2.509557 0.003851 -0.010507 0.012870 0.046398 0.628946 -0.648325 105.063202 2.039570 -81.379745 0 0 31470 0.00 -0.355348 9.406754 -2.555793 0.007465 -0.010464 0.007487 0.044946 0.629848 -0.646315 105.067917 2.035491 -81.384392 0 0 31471 0.00 -0.340433 9.437024 -2.586122 0.025401 -0.001369 0.007353 0.044674 0.629242 -0.650039 105.083534 2.030338 -81.383858 0 0 31472 0.00 -0.309591 9.414604 -2.632260 0.018180 0.002210 0.000297 0.045234 0.629558 -0.646030 105.094681 2.028347 -81.379982 0 0 31473 0.00 -0.301834 9.407135 -2.617033 0.010978 0.002173 -0.000530 0.045248 0.629240 -0.649467 105.102142 2.027006 -81.376312 0 0 31474 0.00 -0.340161 9.414395 -2.586335 0.009210 -0.001448 -0.001415 0.044658 0.630564 -0.647456 105.108086 2.026508 -81.375038 0 0 31475 0.00 -0.355829 9.444443 -2.586042 0.009182 0.002149 -0.004966 0.046398 0.629518 -0.648895 105.114548 2.027624 -81.370712 0 0 31476 0.00 -0.386719 9.466819 -2.593463 0.001863 0.012902 0.005827 0.043800 0.629275 -0.647460 105.116524 2.020975 -81.362938 0 0 31477 0.00 -0.401836 9.451615 -2.585945 0.007537 -0.022161 0.006569 0.046402 0.630365 -0.651183 105.121513 2.019370 -81.373795 0 0 31478 0.00 -0.371030 9.436790 -2.570802 0.018406 -0.026601 -0.001565 0.044670 0.628967 -0.648465 105.132225 2.022714 -81.385025 0 0 31479 0.00 -0.309796 9.437296 -2.555534 0.011150 -0.024833 0.014545 0.045694 0.628062 -0.651477 105.139191 2.017096 -81.398560 0 0 31480 0.00 -0.294490 9.437420 -2.555543 0.006651 -0.019449 -0.007680 0.044670 0.628967 -0.648465 105.143349 2.022755 -81.405540 0 0 31481 0.00 -0.263914 9.437635 -2.593817 0.005631 -0.006848 0.000386 0.045538 0.629660 -0.650468 105.147568 2.022237 -81.406990 0 0 31482 0.00 -0.279394 9.452603 -2.586015 -0.000825 0.011108 0.005842 0.045247 0.628387 -0.647896 105.147964 2.015844 -81.398834 0 0 31483 0.00 -0.302547 9.467491 -2.601162 -0.010818 0.023654 -0.002942 0.045108 0.629519 -0.650754 105.143364 2.012568 -81.382904 0 0 31484 0.00 -0.325351 9.452195 -2.631896 0.000052 0.016513 -0.004842 0.045673 0.629251 -0.647464 105.144424 2.011275 -81.370338 0 0 31485 0.00 -0.371434 9.466923 -2.616426 -0.005399 0.020071 0.004131 0.045396 0.628944 -0.650041 105.142822 2.004628 -81.357452 0 0 31486 0.00 -0.416805 9.421295 -2.616826 -0.007130 0.010155 0.013028 0.045381 0.628979 -0.646033 105.139549 1.994405 -81.351738 0 0 31487 0.00 -0.454886 9.405900 -2.616947 -0.017888 0.007398 0.000640 0.046539 0.630094 -0.648893 105.130577 1.991644 -81.345345 0 0 31488 0.00 -0.401318 9.406333 -2.616977 0.001999 -0.005091 0.012901 0.045092 0.629413 -0.646317 105.132240 1.983772 -81.348038 0 0 31489 0.00 -0.386049 9.414050 -2.555704 -0.001656 0.002078 0.014735 0.047267 0.629639 -0.650328 105.132401 1.974043 -81.346710 0 0 31490 0.00 -0.371030 9.436790 -2.570802 0.010843 0.016542 0.012881 0.046546 0.627936 -0.648043 105.139542 1.962945 -81.336380 0 0 31491 0.00 -0.355516 9.421852 -2.540348 0.025403 -0.001382 0.012697 0.046266 0.628779 -0.651189 105.155144 1.954874 -81.336662 0 0 31492 0.00 -0.355516 9.421852 -2.540348 0.014513 0.012961 -0.001424 0.046827 0.629092 -0.647466 105.164391 1.952219 -81.326546 0 0 31493 0.00 -0.332370 9.406958 -2.532852 0.032711 -0.008536 -0.006997 0.047130 0.628484 -0.650619 105.184143 1.956113 -81.327835 0 0 31494 0.00 -0.309459 9.407099 -2.586424 0.020137 -0.017582 0.002005 0.045535 0.629381 -0.649324 105.196022 1.956144 -81.336517 0 0 31495 0.00 -0.309587 9.422235 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-0.022944 -0.008716 0.045549 0.626353 -0.648907 105.286804 1.923284 -81.475449 0 0 31511 0.00 -0.264198 9.452626 -2.708444 0.025508 -0.015721 -0.005160 0.045272 0.627044 -0.652912 105.302307 1.927199 -81.480972 0 0 31512 0.00 -0.241115 9.445300 -2.670272 0.009115 0.007584 -0.001386 0.043964 0.626371 -0.649190 105.308350 1.925313 -81.475388 0 0 31513 0.00 -0.264429 9.475292 -2.662323 0.003645 0.016550 -0.006655 0.046131 0.627188 -0.651625 105.311935 1.925130 -81.462837 0 0 31514 0.00 -0.294572 9.437344 -2.647358 0.003590 0.021934 0.007615 0.045974 0.627220 -0.648188 105.315033 1.916096 -81.447891 0 0 31515 0.00 -0.355793 9.436850 -2.647324 -0.003602 0.023689 -0.004790 0.047859 0.627310 -0.651627 105.314583 1.913801 -81.431671 0 0 31516 0.00 -0.370853 9.414072 -2.678133 0.003764 0.003037 -0.004914 0.045837 0.626348 -0.649051 105.317497 1.914551 -81.427185 0 0 31517 0.00 -0.385649 9.376285 -2.617270 0.014662 -0.005021 -0.006823 0.047292 0.625441 -0.651634 105.327003 1.917757 -81.426537 0 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0.627589 -0.652771 105.366531 1.881618 -81.329674 0 0 31526 0.00 -0.371071 9.436751 -2.616710 0.012712 0.006664 0.012839 0.046114 0.628940 -0.649470 105.374550 1.872005 -81.326523 0 0 31527 0.00 -0.393952 9.429010 -2.632071 -0.004453 0.012874 0.013012 0.047868 0.626149 -0.652348 105.373329 1.861616 -81.319008 0 0 31528 0.00 -0.355611 9.421763 -2.647466 0.002055 -0.014073 0.012878 0.048428 0.627035 -0.649196 105.374870 1.855131 -81.324684 0 0 31529 0.00 -0.324833 9.406912 -2.662928 -0.001732 0.012909 0.004072 0.047583 0.625859 -0.652921 105.375252 1.849689 -81.315788 0 0 31530 0.00 -0.309548 9.407017 -2.685890 -0.003573 0.017406 0.004102 0.046994 0.626038 -0.649770 105.374176 1.843271 -81.305855 0 0 31531 0.00 -0.278574 9.377092 -2.686192 -0.017901 0.012846 -0.017173 0.049018 0.626712 -0.652348 105.365402 1.849569 -81.293770 0 0 31532 0.00 -0.271096 9.392246 -2.678403 -0.007118 0.016499 -0.018151 0.048138 0.627900 -0.649764 105.362381 1.855584 -81.278496 0 0 31533 0.00 -0.309682 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-80.577774 0 0 31647 0.00 -0.355093 9.376481 -2.678498 -0.013820 -0.059130 0.014676 0.049582 0.628588 -0.651625 105.277855 2.206262 -80.610344 0 0 31648 0.00 -0.401136 9.391247 -2.617119 0.002409 -0.059069 0.012748 0.048850 0.628482 -0.648189 105.278595 2.206631 -80.641090 0 0 31649 0.00 -0.431552 9.375926 -2.601941 -0.006478 -0.075317 0.016347 0.047720 0.627016 -0.652487 105.274551 2.208052 -80.682869 0 0 31650 0.00 -0.332095 9.376704 -2.632603 0.002516 -0.073447 0.012704 0.046833 0.628506 -0.648471 105.275040 2.210614 -80.723770 0 0 31651 0.00 -0.263423 9.392326 -2.655453 0.015124 -0.071565 0.003684 0.047709 0.627899 -0.650622 105.283516 2.218420 -80.761551 0 0 31652 0.00 -0.232974 9.407679 -2.632375 -0.001288 -0.051858 0.024384 0.046114 0.628513 -0.648756 105.282219 2.211272 -80.791595 0 0 31653 0.00 -0.263585 9.407432 -2.632357 0.016795 -0.051767 -0.005188 0.046420 0.627897 -0.652767 105.292114 2.220914 -80.817078 0 0 31654 0.00 -0.271069 9.392271 -2.647798 0.006718 -0.028423 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0.00 -0.401298 9.406351 -2.594023 0.016315 0.020176 -0.028154 0.046415 0.626623 -0.649766 105.322571 2.226680 -80.778778 0 0 31663 0.00 -0.370849 9.421703 -2.570944 0.003611 0.030909 -0.024445 0.048437 0.627728 -0.652629 105.326775 2.234237 -80.755592 0 0 31664 0.00 -0.340258 9.421931 -2.593915 0.008888 0.045338 -0.017324 0.046985 0.628202 -0.650047 105.333641 2.235436 -80.725250 0 0 31665 0.00 -0.355725 9.436913 -2.570811 0.001690 0.043496 -0.015480 0.047576 0.627445 -0.653201 105.336960 2.236103 -80.696449 0 0 31666 0.00 -0.355466 9.414271 -2.586327 0.017941 0.041782 -0.022763 0.047287 0.626024 -0.650916 105.348969 2.240840 -80.667679 0 0 31667 0.00 -0.340224 9.421963 -2.555659 0.010781 0.038147 -0.031621 0.049013 0.627723 -0.652344 105.357468 2.251201 -80.639389 0 0 31668 0.00 -0.355732 9.436907 -2.578462 -0.003787 0.057869 -0.033215 0.046991 0.627187 -0.650481 105.357452 2.259265 -80.600182 0 0 31669 0.00 -0.355843 9.444430 -2.601345 0.012323 0.072349 -0.036884 0.049016 0.626432 -0.651347 105.367615 2.267314 -80.552170 0 0
(the data is best be seen by jEdit)
I intend to load the data file to the CC2540 Module mounted on SmartRF05 EB through USB cable and then wirelessly transfer the data to Mater CC2540 module on another SmartRF05EB.
My initial data file has size of aroung 12 MB, but I cut it to a small section to test first as on the SmartRF05EB, there's not memory chips to store the amount of data.
Regards,
Hi Daniel,
First of all, I didn't do my math correctly before, it should be 8KB/s transfer rate. This means that it would take over 25 minutes for you to transfer 12 MB of data, if the link is in perfect condition and you maximize the performance. As mentioned earlier, BLE should not be used for large data transfers.
If you decide to go for BLE anyways, you should start by looking at simpleBLEPeripheral, where you typically would use characteristic values to buffer data.
BR
Hi Nick,
Thanks for that. I have noticed it. The text file I attached last time has many lines of data information with each line starting with a counter number. (each line has 133 characters which can be represented by 133 bytes of ASCII code) If, under optimized condition, the maximum 8KB/s rate can be achieved, does it mean that around 60 lines of data can be trasfer over BLE link?
What do you mean "BLE should not be used for large data transfers"? If we use, what the problems might be?
Regards,
Hi Dan,
BLE was designed for sensor applications or similar in mind. Of course you can send large files in BLE, but it is not designed for this purpose. Since BLE devices usually run with cell coin or small batteries, if the communication only occurs ocasionally (for example, every 10 seconds) the batteries can last for "long".
When sending a large file, you are forcing the BLE chip to continuously spend energy. I do not know how used are you to battery terms, but, for example, CR2032 batteries use to present a 230mAh capacity. That means that if you use for example 23mA... this is gonna last 10 hours, in the most optimistic case. Since BLE devices are thought to, for example, last for 2 years if used wisely, you can see the difference.
If you do not have battery constrainments, do whatever you want, but then you could use a dual chip and employ the traditional Bluetooth interface (not the BLE one) to transfer big files.
Hi Daniel,
Daniel Liu said:does it mean that around 60 lines of data can be trasfer over BLE link?
60 Lines/Second, yes
.Daniel Liu said:What do you mean "BLE should not be used for large data transfers"? If we use, what the problems might be?
As Kazola mentions, it has got to do with the amount of time it takes to do large transfers and the battery consumption that comes with that. Otherwise there is no "issue" with doing large transfers, just that there are much better solutions for this.
BR
Hi Kazola,
I understand what you are saying. My this task is given by a local company which is using ANT ULP solutions on their products: body sensors. The company is also going to try BLE as BLE and ANT are both ULP solutions and evaluate their performance.
The 12MB data file is just for evaluation purposes of BLE wireless performance. Actually, the data file doesn't have to that big to do the test. If we are satisfied with BLE performance, then I will be given the next task to integrate single-mode BLE IC and Classic Bluetooth IC onto our sensors as currently no Dual-mode solutions available yet.
Regards,
Hi Nick,
Can I only use IAR development platform to write my applications for CC2540? The evaluation version of IAR has only one month for free use and academic and commercial are very expensive. I'm afraid my programming skills will have myself spend more than one month to write the correct applications.
Regards,
Ouch.
I think this info is right. Did you know this?
Hi Kazola,
I know two of them: TI's and BlueRadios dual-mode solutions.
The problems are:
1. TI's dual mode has export controls, and is very difficult to ship to Australia.
2.1 BlueRadios, I knew this months ago around this May, that it's going to deliver dual-mode solution, however, the dual-mode solution is still under status of sampling not shipping. I actually ordered its single mode Dev. kit and hope to move onto its dual mode solutions. I also contacted to the company's CEO Mark Cramer, he told me the dual-mode was going to start shipping in Fall this year. However, the status on its website is still in sampling.
2.2 Another reason is that after I order its single mode kit, I found there were very limited documentation materials about how to use and no technical supports like E2E Community.
2.3 The third reason, the kit includes only a Master USB dongle and a Slave Dev. board and a cable. The antennas are not visible.
Anyway, I have told the company we can directly use dual-mode solution, however, dual-mode is more complicated than single-mode, and the company is very cautious on BLE technology and wish to do single mode evaluation first and then either integrate a BLE and a Classic Bluetooth chip or directly use a dual-mode based on the degree of complexity.
Regards,
