int |-> float fixed p3t readings

aolgeirson · aolgeirson · commit 0b337d4b5a8a · 2026-03-20T13:48:41.000-04:00
diff --git a/general/include/p3t1755.h b/general/include/p3t1755.h
@@ -65,7 +65,7 @@ typedef struct {
   ReadPtr read;
 } p3t1755_t;
 
-static inline int16_t p3t1755_raw_to_celsius(uint16_t raw);
+static inline float p3t1755_raw_to_celsius(uint16_t raw);
 
 void p3t1755_init(p3t1755_t *p3t, WritePtr write, ReadPtr read,
                   uint16_t dev_addr);
diff --git a/general/src/p3t1755.c b/general/src/p3t1755.c
@@ -25,12 +25,12 @@ int p3t1755_read_reg(p3t1755_t *p3t, uint16_t reg, uint8_t *data,
   return p3t->read(p3t->dev_addr, reg, data, length);
 }
 
-inline int16_t p3t1755_raw_to_celsius(uint16_t raw) {
+inline float p3t1755_raw_to_celsius(uint16_t raw) {
   PRINTLN_INFO("raw temp: %d", raw);
   if (raw & 1 << 11) { // Check if sign bit is set |-> t<0
-    return -(int16_t)(raw * p3t1755_TEMP_RESOLUTION);
+    return -(raw * p3t1755_TEMP_RESOLUTION);
   } else
-    return (int16_t)(raw * p3t1755_TEMP_RESOLUTION);
+    return (raw * p3t1755_TEMP_RESOLUTION);
 }
 
 int p3t1755_read_temperature(p3t1755_t *p3t, float *temp_c) {

Original file line number	Diff line number	Diff line change
`@@ -25,12 +25,12 @@ int p3t1755_read_reg(p3t1755_t p3t, uint16_t reg, uint8_t data,`
`25`	`25`	`return p3t->read(p3t->dev_addr, reg, data, length);`
`26`	`26`	`}`
`27`	`27`
`28`		`-inline int16_t p3t1755_raw_to_celsius(uint16_t raw) {`
	`28`	`+inline float p3t1755_raw_to_celsius(uint16_t raw) {`
`29`	`29`	`PRINTLN_INFO("raw temp: %d", raw);`
`30`	`30`	`if (raw & 1 << 11) { // Check if sign bit is set \|-> t<0`
`31`		`- return -(int16_t)(raw * p3t1755_TEMP_RESOLUTION);`
	`31`	`+ return -(raw * p3t1755_TEMP_RESOLUTION);`
`32`	`32`	`} else`
`33`		`- return (int16_t)(raw * p3t1755_TEMP_RESOLUTION);`
	`33`	`+ return (raw * p3t1755_TEMP_RESOLUTION);`
`34`	`34`	`}`
`35`	`35`
`36`	`36`	`int p3t1755_read_temperature(p3t1755_t p3t, float temp_c) {`