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/* test debounce() function. 16/6/1 Passed test for SAMPLE_COUNT 1, 2, and 4. |
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copied from keybrd/src/Row::debounce() |
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to run test: |
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$ g++ debounce_unit_test.cpp |
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$ ./a.out |
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*/ |
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#include <inttypes.h> |
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#include <iostream> |
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#define SAMPLE_COUNT 4 //number of consecutive equal bits needed to change a debounced bit |
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uint8_t samples[SAMPLE_COUNT]; //bitwise, one bit per key, most recent readings |
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uint8_t samplesIndex = 0; //samples[] current write index |
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uint8_t debounced = 0; //bitwise, one bit per key |
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uint8_t debounce(const uint8_t rowState) |
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{ |
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uint8_t all_1 = ~0; //bitwise |
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uint8_t all_0 = 0; //bitwise |
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//delayMicroseconds(DELAY_MICROSECONDS); //delay between Row scans to debounce key |
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samples[samplesIndex] = rowState; //insert rowState into samples[] ring buffer |
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if (++samplesIndex >= SAMPLE_COUNT) //if end of ring buffer |
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{ |
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samplesIndex = 0; //wrap samplesIndex to beginning of ring buffer |
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} |
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for (uint8_t j = 0; j < SAMPLE_COUNT; j++) //traverse the sample[] ring buffer |
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{ |
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all_1 &= samples[j]; //1 if all samples are 1 |
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all_0 |= samples[j]; //0 if all samples are 0 |
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} |
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// update newDebounce if all the samples agree with one another |
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// if all samples=1 then newDebounced=1 |
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// elseif all samples=0 then newDebounced=0 |
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// else newDebounced=debounced i.e. no change |
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//return all_1 | (all_0 & debounced); |
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debounced = all_1 | (all_0 & debounced); |
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return debounced; |
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} |
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int main() |
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{ |
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//Test input and output only shows first bit of each byte. |
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const uint8_t pressed[] = {1,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0}; |
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const uint8_t bouncy[] = {1,0,0,0,0,1,0,0,1,1,1,1,0,1,1,1,1,0,0,0,0}; |
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const uint8_t SCAN_COUNT = sizeof(bouncy)/sizeof(*bouncy); |
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uint8_t i; |
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uint8_t newDebounced; |
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std::cout << "button pressed: "; |
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for (i=0; i<SCAN_COUNT; i++) |
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{ |
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std::cout << (int)pressed[i]; |
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} |
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std::cout << std::endl; |
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std::cout << "bouncy signal: "; |
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for (i=0; i<SCAN_COUNT; i++) |
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{ |
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std::cout << (int)bouncy[i]; |
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} |
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std::cout << std::endl; |
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std::cout << "debounced signal: "; |
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for (i=0; i<SCAN_COUNT; i++) |
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{ |
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newDebounced = debounce(bouncy[i]); |
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std::cout << (int)newDebounced; |
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} |
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std::cout << std::endl; |
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} |
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void loop() { } |
wolfv6
8 years ago