improving sample rate

[gaeljaton]

hi, great work, I eventually succed to work this lib on teensy hardware, but sample rate was slow (default 10SPS) and get hard to open monitor.
so I look at .cpp and I was intrigued by line 133 (read function) :
for (unsigned int i = 0; i < 128; i++) { digitalWrite(PD_SCK, HIGH); #if ARCH_ESPRESSIF delayMicroseconds(1); #endif digitalWrite(PD_SCK, LOW); #if ARCH_ESPRESSIF delayMicroseconds(1); #endif }
why do you produce 128 pulses? according to datasheet, hx710b need between 25 an 27 pulse to properly work
PD_SCK / Pulses Input / Data Rate
25 / Differential input / 10 Hz
26 / Temperature / 40 Hz
27 / Differential input / 40 Hz
so I done some change (I work on teensy LC, I guess I need some timing between pulse) :
for (unsigned int i = 0; i < 3; i++) { digitalWrite(PD_SCK, HIGH); //#if ARCH_ESPRESSIF delayMicroseconds(1); //#endif digitalWrite(PD_SCK, LOW); //#if ARCH_ESPRESSIF delayMicroseconds(1); //#endif }
It seem's to work properly and I double at least the sample rate near 25-30SPS (I guess serial routine slow down a bit the theorical 40SPS).
I'm not sure my butcher's code will work on other boards so I let you (or community) to pull this crap properly :)