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Fix endian conversion when reading weight

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Eric Jiang 2025-06-14 09:02:01 -07:00
parent 3ffb1693cb
commit 905e8dd17f
1 changed files with 4 additions and 2 deletions
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usbscale.c
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@ -376,8 +376,10 @@ static int print_scale_data(unsigned char* dat) {
uint8_t unit = dat[2]; uint8_t unit = dat[2];
// According to the docs, scaling applied to the data as a base ten exponent // According to the docs, scaling applied to the data as a base ten exponent
int8_t expt = dat[3]; int8_t expt = dat[3];
// convert to machine order at all times // combine the little-endian weight bytes without relying on system
double weight = (double) le16toh(dat[5] << 8 | dat[4]); // endianness. dat[4] is the low byte and dat[5] is the high byte.
uint16_t raw_weight = (uint16_t)dat[4] | ((uint16_t)dat[5] << 8);
double weight = (double)raw_weight;
// since the expt is signed, we do not need no trickery // since the expt is signed, we do not need no trickery
weight = weight * pow(10, expt); weight = weight * pow(10, expt);