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drivers/ds18: fix ds18_read with negative temperatures

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When DS18 returns 0xFE6F (corresponding to -25.0625 °C), `ds18_read` returns
13877 whereas it should return -2506. This commit fixes this issue.
This commit is contained in:
Guillaume Gonnet 2019-05-16 20:12:22 +02:00
parent 901513391a
commit 1783b3da55
1 changed files with 1 additions and 1 deletions
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drivers/ds18/ds18.c
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@ -184,7 +184,7 @@ int ds18_read(const ds18_t *dev, int16_t *temperature)
DEBUG("[DS18] Received byte: 0x%02x\n", b2); DEBUG("[DS18] Received byte: 0x%02x\n", b2);
int32_t measurement = ((int32_t)(b2 << 8 | b1) * 625); int32_t measurement = ((int16_t)(b2 << 8 | b1) * 625);
*temperature = (int16_t)(measurement / 100); *temperature = (int16_t)(measurement / 100);
return DS18_OK; return DS18_OK;