Merge pull request #461 from FrankBoesing/patch-7

fix double promotion

teensy4/IntervalTimer.h

 	}
 	bool begin(void (*funct)(), float microseconds) {
 		if (microseconds <= 0 || microseconds > MAX_PERIOD) return false;
-		uint32_t cycles = (float)(24000000 / 1000000) * microseconds - 0.5;
+		uint32_t cycles = (float)(24000000 / 1000000) * microseconds - 0.5f;
 		if (cycles < 17) return false;
 		return beginCycles(funct, cycles);
 	}
 	}
 	void update(float microseconds) {
 		if (microseconds <= 0 || microseconds > MAX_PERIOD) return;
-		uint32_t cycles = (float)(24000000 / 1000000) * microseconds - 0.5;
+		uint32_t cycles = (float)(24000000 / 1000000) * microseconds - 0.5f;
 		if (cycles < 17) return;
 		if (channel) channel->LDVAL = cycles;
 	}

teensy4/Stream.cpp

     else if(c >= '0' && c <= '9')  {      // is c a digit?
       value = value * 10 + c - '0';
       if(isFraction)
-         fraction *= 0.1;
+         fraction *= 0.1f;
     }
     read();  // consume the character we got with peek
     c = timedPeek();

teensy4/nonstd.c

 
 			// shift decimal point
 			while (newPrecision > 0) {
-				val *= 10.0;
+				val *= 10.0f;
 				newPrecision--;
 			}
 

teensy4/pwm.c

 {
 	uint16_t mask = 1 << submodule;
 	uint32_t olddiv = p->SM[submodule].VAL1;
-	uint32_t newdiv = (uint32_t)((float)F_BUS_ACTUAL / frequency + 0.5);
+	uint32_t newdiv = (uint32_t)((float)F_BUS_ACTUAL / frequency + 0.5f);
 	uint32_t prescale = 0;
 	//printf(" div=%lu\n", newdiv);
 	while (newdiv > 65535 && prescale < 7) {
 
 void quadtimerFrequency(IMXRT_TMR_t *p, unsigned int submodule, float frequency)
 {
-	uint32_t newdiv = (uint32_t)((float)F_BUS_ACTUAL / frequency + 0.5);
+	uint32_t newdiv = (uint32_t)((float)F_BUS_ACTUAL / frequency + 0.5f);
 	uint32_t prescale = 0;
 	//printf(" div=%lu\n", newdiv);
 	while (newdiv > 65534 && prescale < 7) {