drivers/hih6130: avoid using floats

drivers/hih6130/hih6130.c

@@ -93,14 +93,14 @@ static inline int hih6130_get_humidity_temperature_raw(const hih6130_t *dev, uin
 
     /* data is in big-endian format, with status bits in the first byte. */
     switch (buf[0] & HIH6130_STATUS_MASK) {
-        case HIH6130_STATUS_OK:
-            status = 0;
-            break;
-        case HIH6130_STATUS_STALE_DATA:
-            status = 1;
-            break;
-        default:
-            return -2;
+    case HIH6130_STATUS_OK:
+        status = 0;
+        break;
+    case HIH6130_STATUS_STALE_DATA:
+        status = 1;
+        break;
+    default:
+        return -2;
     }
 
     *humidity_raw    = ((buf[0] << 8) | buf[1]) & HIH6130_HUMIDITY_MASK;
@@ -109,8 +109,8 @@ static inline int hih6130_get_humidity_temperature_raw(const hih6130_t *dev, uin
     return status;
 }
 
-int hih6130_get_humidity_temperature_float(const hih6130_t *dev,
-    float *relative_humidity_percent, float *temperature_celsius)
+int hih6130_get_humidity_temperature(const hih6130_t *dev,
+        int32_t *humidity_milli_percent, int32_t *temperature_milli_celsius)
 {
     uint16_t hum_raw, temp_raw;
     int status;
@@ -127,11 +127,12 @@ int hih6130_get_humidity_temperature_float(const hih6130_t *dev,
         return -1;
     }
 
-    if (relative_humidity_percent != NULL) {
-        *relative_humidity_percent = hum_raw * (100.f / 16383.f);
+    if (humidity_milli_percent != NULL) {
+        *humidity_milli_percent= (int32_t)hum_raw * 100000 / 16383;
     }
-    if (temperature_celsius != NULL) {
-        *temperature_celsius = temp_raw * (165.f / 16383.f) - 40.f;
+
+    if (temperature_milli_celsius != NULL) {
+        *temperature_milli_celsius = (int32_t)temp_raw * 165000 / 16383 - 40000;
     }
 
     return status;

drivers/include/hih6130.h

@@ -49,18 +49,18 @@ typedef struct {
 void hih6130_init(hih6130_t *dev, i2c_t i2c, uint8_t address);
 
 /**
- * @brief   Read humidity and temperature from sensor and convert to floating-point
+ * @brief   Read humidity and temperature
  *
- * @param[in]  dev                       Sensor device descriptor
- * @param[out] relative_humidity_percent Measured relative humidity in percent
- * @param[out] temperature_celsius       Measured temperature in degrees Celsius
+ * @param[in]  dev                          Sensor device descriptor
+ * @param[out] humidity_milli_percent       Relative humidity in E-03 %
+ * @param[out] temperature_milli_celsius    Temperature in m°C
  *
- * @return 0 on success
- * @return -1 on error
- * @return 1 if data is stale
+ * @retval  0       success
+ * @retval  -1      error
+ * @retval 1        data is stale
  */
-int hih6130_get_humidity_temperature_float(const hih6130_t *dev,
-    float *relative_humidity_percent, float *temperature_celsius);
+int hih6130_get_humidity_temperature(const hih6130_t *dev,
+        int32_t *humidity_milli_percent, int32_t *temperature_milli_celsius);
 
 #ifdef __cplusplus
 }

tests/drivers/hih6130/Makefile

@@ -1,7 +1,8 @@
 include ../Makefile.drivers_common
 
+USEMODULE += fmt
 USEMODULE += hih6130
-USEMODULE += xtimer
+USEMODULE += ztimer_msec
 
 # set default device parameters in case they are undefined
 TEST_HIH6130_I2C  ?= I2C_DEV\(0\)

tests/drivers/hih6130/app.config.test

@@ -1,4 +1,5 @@
 # this file enables modules defined in Kconfig. Do not use this file for
 # application configuration. This is only needed during migration.
 CONFIG_MODULE_HIH6130=y
-CONFIG_MODULE_XTIMER=y
+CONFIG_MODULE_ZTIMER_MSEC=y
+CONFIG_MODULE_FMT=y

tests/drivers/hih6130/main.c

@@ -25,50 +25,49 @@
 #error "TEST_HIH6130_ADDR not defined"
 #endif
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-
-#include "xtimer.h"
+#include "fmt.h"
 #include "hih6130.h"
+#include "ztimer.h"
 
-#define SLEEP_USEC  (100 * 1000U)
+#define SLEEP_MSEC  100
 
 int main(void)
 {
     hih6130_t dev;
 
-    puts("HIH6130 sensor driver test application\n");
+    print_str("HIH6130 sensor driver test application\n");
 
-    printf("Initializing HIH6130 sensor at I2C_%i, address 0x%02x... ",
-        TEST_HIH6130_I2C, TEST_HIH6130_ADDR);
+    print_str("Initializing HIH6130 sensor at I2C_");
+    print_u32_dec(TEST_HIH6130_I2C);
+    print_str(", address 0x");
+    print_u32_hex(TEST_HIH6130_ADDR);
+    print_str("...\n");
     hih6130_init(&dev, TEST_HIH6130_I2C, TEST_HIH6130_ADDR);
-    puts("[OK]");
+    print_str("[OK]\n");
 
     while (1) {
-        float hum = 0.f;
-        float temp = 0.f;
+        int32_t hum, temp;
         int status;
-        float integral = 0.f;
-        float fractional;
 
-        xtimer_usleep(SLEEP_USEC);
+        ztimer_sleep(ZTIMER_MSEC, SLEEP_MSEC);
 
-        status = hih6130_get_humidity_temperature_float(&dev, &hum, &temp);
+        status = hih6130_get_humidity_temperature(&dev, &hum, &temp);
         if (status < 0) {
-            printf("Communication error: %d\n", status);
+            print_str("Communication error: ");
+            print_s32_dec(status);
+            print_str("\n");
             continue;
-        } else if (status == 1) {
-            puts("Stale values");
         }
-        /* Several platforms usually build with nano.specs, (without float printf) */
-        /* Split value into two integer parts for printing. */
-        fractional = modff(hum, &integral);
-        printf("humidity: %4d.%04u %%",
-            (int)integral, (unsigned int)abs((int)(fractional * 10000.f)));
-        fractional = modff(temp, &integral);
-        printf("  temperature: %4d.%04u C\n",
-            (int)integral, (unsigned int)abs((int)(fractional * 10000.f)));
+        else if (status == 1) {
+            print_str("Stale values\n");
+        }
+
+        print_str("humidity: ");
+        char buf[20];
+        print(buf, fmt_s32_dfp(buf, hum, -3));
+        print_str(" %, temperature: ");
+        print(buf, fmt_s32_dfp(buf, temp, -3));
+        print_str(" °C\n");
     }
 
     return 0;