79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
/* 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() { }
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