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Using the MBED BLE library and Nordic Puck library this is a simple scoring application using Bluetooth LE. It monitors three analog inputs and triggers on reception of a pulse on any one recording data for a short period on all three. This is then published via BLE characteristics. It's a demonstrator for a new UI dev toolkit that is under development.
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Diff: main.cpp
- Revision:
- 10:a2ba0cef85aa
- Parent:
- 9:f2b2ebc6d908
diff -r f2b2ebc6d908 -r a2ba0cef85aa main.cpp --- a/main.cpp Sun Aug 24 20:50:22 2014 +0000 +++ b/main.cpp Tue Aug 26 14:13:31 2014 +0000 @@ -9,6 +9,7 @@ #include "Puck.h" #include "SampleChannel.h" +// This is a singleton for the Nordic Puck library which helps with some BLE init, etc. Puck* puck = &Puck::getPuck(); // Gatt characteristic and service UUIDs @@ -17,10 +18,11 @@ const UUID DIVISOR_GATT_CHARACTERISTIC = stringToUUID("nod.score1.div "); const UUID INTERVAL_US_GATT_CHARACTERISTIC = stringToUUID("nod.score1.intus"); +// Three channels for scoring const int NUM_SAMPLE_CHANNELS = 3; // Sample interval (uS) -uint32_t sampleIntervalUs = 10000; +volatile uint32_t sampleIntervalUs = 10000; // Interrupt driven ticker to do the sampling Timeout sampleTimeout; @@ -37,17 +39,16 @@ Timer intervalTimer; int lastTriggerTime = 0; int lastSampleTime = 0; -const int MIN_MS_BETWEEN_SAMPLES = 2000; +const int MIN_MS_BETWEEN_TRIGGERS = 2000; // Function called in interrupt driven timeout to handle sampling static volatile int serviceCount = 0; void SampleService() { + // For debug timing serviceCount++; - sampleTimeout.attach_us(&SampleService, sampleIntervalUs); - - // service all channel's state machines + // Service all channel's state machines bool isAnyChannelSampling = false; for (int chanIdx = 0; chanIdx < NUM_SAMPLE_CHANNELS; chanIdx++) { @@ -55,14 +56,16 @@ if (sampleChannels[chanIdx].IsSampling()) isAnyChannelSampling = true; } - + + // Check if any channel is being sampled already (if so don't check for triggering) if (!isAnyChannelSampling) { + // Check for triggering only if previous trigger was a reasonable time ago int curTimerVal = intervalTimer.read_ms(); - if ((lastTriggerTime < curTimerVal) || (curTimerVal - lastTriggerTime > MIN_MS_BETWEEN_SAMPLES)) - { - - // check each channel to see if it's been triggered + // Check for lastTriggerTime < curTimerVal is to handle (not perfectly) overflow/reset of intervalTimer + if ((lastTriggerTime < curTimerVal) || (curTimerVal - lastTriggerTime > MIN_MS_BETWEEN_TRIGGERS)) + { + // Check each channel to see if it's been triggered bool anythingTriggered = false; for (int chanIdx = 0; chanIdx < NUM_SAMPLE_CHANNELS; chanIdx++) { @@ -73,19 +76,23 @@ break; } } + // If any channel has triggered ... if(anythingTriggered) { + // Start sampling on all channels for (int chanIdx = 0; chanIdx < NUM_SAMPLE_CHANNELS; chanIdx++) - { sampleChannels[chanIdx].StartSampling(); - } // Set timer to disallow repeated readings lastTriggerTime = curTimerVal; } } } + + // Request a callback to this function after the sample interval + sampleTimeout.attach_us(&SampleService, sampleIntervalUs); } - + +// ThresholdSet ... BLE characteristic callback void onThresholdSet(uint8_t* value) { uint16_t threshold = value[0] * 256 + value[1]; @@ -94,6 +101,7 @@ sampleChannels[chanIdx].SetThreshold(threshold); } +// DivisorSet ... BLE characteristic callback void onDivisorSet(uint8_t* value) { uint16_t divisor = value[0] * 256 + value[1]; @@ -102,18 +110,17 @@ sampleChannels[chanIdx].SetDivisor(divisor); } +// Inverval ... BLE characteristic callback void onIntervalSet(uint8_t* value) { uint32_t intervalUs = (value[0] << 24) + (value[1] << 16) + (value[2] << 8) + value[3]; LOG_INFO("SampleInterval(uS)=%d\n", intervalUs); + // Interval timer is restarted in the Ticker callback so just need to store this value if (intervalUs <= 1000000) - { sampleIntervalUs = intervalUs; -// sampleTicker.detach(); -// sampleTicker.attach_us(&SampleService, sampleIntervalUs); - } } +// Main - Setup BLE and service the trigger sampling and BLE int main(void) { @@ -179,8 +186,17 @@ if ((nowTime - lastPuckDriveTime >= 1000) || (nowTime < lastPuckDriveTime)) { unsigned int elapsed = nowTime - lastPuckDriveTime; - LOG_INFO("%u E%u C%u DC%u TC%u DTC%u L%u DL%u\n", nowTime, elapsed, serviceCount, serviceCount-lastServiceCount, nowTime/serviceCount, elapsed/(serviceCount-lastServiceCount), driveLoops, driveLoops-lastDriveLoops); - lastPuckDriveTime = intervalTimer.read_ms(); + LOG_INFO("E%u C%u DC%u DTC%u L%u DL%u\n", elapsed, serviceCount, serviceCount-lastServiceCount, elapsed/(serviceCount-lastServiceCount), driveLoops, driveLoops-lastDriveLoops); + + // Check for overflow of timer + if (nowTime > 100000) + { + intervalTimer.reset(); + nowTime = 0; + } + + // Record last timer value + lastPuckDriveTime = nowTime; lastDriveLoops = driveLoops; lastServiceCount = serviceCount; }