Issue adafruit#49 - fix long cable read delay on DHT sensor with RPI 1

phantomqa · phantomqa · commit dc3f15e381ad · 2018-06-20T14:30:56.000-07:00
diff --git a/source/Raspberry_Pi/pi_dht_read.c b/source/Raspberry_Pi/pi_dht_read.c
@@ -72,7 +72,7 @@ int pi_dht_read(int type, int pin, float* humidity, float* temperature) {
   // Set pin at input.
   pi_mmio_set_input(pin);
   // Need a very short delay before reading pins or else value is sometimes still low.
-  for (volatile int i = 0; i < 50; ++i) {
+  for (volatile int i = 0; i < 500; ++i) {
   }
 
   // Wait for DHT to pull pin low.

Original file line number	Diff line number	Diff line change
`@@ -72,7 +72,7 @@ int pi_dht_read(int type, int pin, float* humidity, float* temperature) {`
`72`	`72`	`// Set pin at input.`
`73`	`73`	`pi_mmio_set_input(pin);`
`74`	`74`	`// Need a very short delay before reading pins or else value is sometimes still low.`
`75`		`- for (volatile int i = 0; i < 50; ++i) {`
	`75`	`+ for (volatile int i = 0; i < 500; ++i) {`
`76`	`76`	`}`
`77`	`77`
`78`	`78`	`// Wait for DHT to pull pin low.`