AHT20 work. Fix i2c read.

Dryer.layout

@@ -2,54 +2,54 @@
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@@ -57,19 +57,19 @@
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inc/sensor.h

@@ -20,8 +20,8 @@ typedef enum {
 
 /* Data type */
 typedef struct {
-  uint8_t Humidity;
-   int8_t Temperature;
+  uint16_t Humidity;
+   int16_t Temperature;
 } aht20_t;
 
 /* Function */

src/sensor.c

@@ -52,7 +52,7 @@ aht20_st_t AHT20_Init(void)
   }
 
   /* get one byte with NACK */
-  res = I2C_ReadByte(&data, 1);
+  res = I2C_ReadByte(&data, 0);
   if (res != I2C_Ret_OK) {
     return AHT_St_Err;
   }
@@ -143,23 +143,15 @@ aht20_st_t AHT20_GetData(aht20_t * data)
     return AHT_St_Err;
   }
 
-  /* Now read the data */
-  uint8_t buf[8];
-  uint8_t rd, i;
-  /* read status and data */
-  for (i=0; i<6; i++) {
-    res = I2C_ReadByte(&rd, 0);
+  /* Now read 7 bytes of data */
+  uint8_t buf[8], i;
+
+  for (i=0; i<7; i++) {
+    res = I2C_ReadByte(&buf[i], 6-i);
     if (res != I2C_Ret_OK) {
       return AHT_St_Err;
     }
-    buf[i] = rd;
-  }
-  /* read crc */
-  res = I2C_ReadByte(&rd, 1);
-  if (res != I2C_Ret_OK) {
-    return AHT_St_Err;
   }
-  buf[6] = rd;
 
   I2C_Stop();
 
@@ -177,10 +169,12 @@ aht20_st_t AHT20_GetData(aht20_t * data)
   result <<= 8;
   result |= buf[3];
   result >>= 4;
-  result *= 100;
+  result *= 1000;
   result += 524288;
-  result /= 10248576;
-  data->Humidity = (uint8_t)result;
+  result /= 256;
+  result /= 256;
+  result /= 16;
+  data->Humidity = (uint16_t)result;
 
   /* Temperature = St * 200 / 2^20 - 50 */
   result = buf[3] & 0xf;
@@ -188,11 +182,12 @@ aht20_st_t AHT20_GetData(aht20_t * data)
   result |= buf[4];
   result <<= 8;
   result |= buf[5];
-  result *= 200;
+  result *= 2000;
   result += 524288;
-  result /= 1048576;
-  result -= 50;
-  data->Temperature = (int8_t)result;
+  result /= 256;
+  result /= 256;
+  result /= 16;
+  data->Temperature = (int16_t)(result - 500);
 
   return AHT_St_OK;
 }