112 lines
2.7 KiB
C++
112 lines
2.7 KiB
C++
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#include "HX710B.h"
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HX710B::HX710B(uint8_t sck_pin , uint8_t do_pin, uint8_t mode)
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{
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this->SCK_pin = sck_pin;
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this->DO_pin = do_pin;
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this->mode = mode;
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}
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HX710B::~HX710B(){}
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void HX710B::halt_(unsigned long time_)
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{
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if( this->delay_ == NULL )
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delay(time_);
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else
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this->delay_(time_);
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}
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unsigned long HX710B::getTick(void)
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{
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if( this->tick != NULL )
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return this->tick();
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else
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return millis();
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}
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void HX710B::attachDelay(void (*delay__)(unsigned long ti))
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{
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this->delay_ = delay__;
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}
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void HX710B::attachTick(unsigned long (*tick_)(void))
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{
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this->tick = tick_;
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}
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uint8_t HX710B::init(void)
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{
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if (this->SCK_pin == NO_PIN_DEFINED ||
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this->DO_pin == NO_PIN_DEFINED )
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return HX710B_ERROR;
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pinMode(this->DO_pin, INPUT_PULLUP); digitalWrite(this->DO_pin, HIGH);
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pinMode(this->SCK_pin, OUTPUT); digitalWrite(this->SCK_pin, HIGH);
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for (uint8_t t_ = 0; t_ < this->mode; t_++)
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{
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NOP NOP NOP NOP NOP NOP NOP NOP NOP
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digitalWrite(this->SCK_pin, LOW);
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NOP NOP NOP NOP NOP NOP NOP NOP NOP
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digitalWrite(this->SCK_pin, HIGH);
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}
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read(NULL, 500UL);
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this->halt_(500);
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uint8_t ret = read(NULL, 100);
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return ret;
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}
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uint8_t HX710B::setMode(uint8_t mode_, unsigned long timeout_)
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{
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uint32_t val;
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return read(&val, timeout_);
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}
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uint8_t HX710B::read(uint32_t *data, unsigned long timeout_)
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{
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// exit sleep mode
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digitalWrite(this->SCK_pin, LOW);
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if (this->isReady(timeout_) == HX710B_OK)
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{
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uint8_t i = 0;
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uint32_t raw = 0;
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for (i = 0; i < this->mode; i++)
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{
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NOP NOP NOP NOP NOP NOP NOP NOP NOP
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digitalWrite(this->SCK_pin, HIGH);
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NOP NOP NOP NOP NOP NOP NOP NOP NOP
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digitalWrite(this->SCK_pin, LOW);
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if (i < 24)
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{
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raw = raw << 1;
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if (digitalRead(this->DO_pin))
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raw = raw | 0x01;
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}
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}
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// force the HX710B to enter the sleep mode
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digitalWrite(this->SCK_pin, HIGH);
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if( data != NULL)
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*data = raw ^ 0x800000;
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return HX710B_OK;
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}
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return HX710B_TIMEOUT;
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}
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uint8_t HX710B::isReady(unsigned long timeout_)
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{
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unsigned long time_s = this->getTick();
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while (digitalRead(this->DO_pin)!= LOW)
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{
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// preventive if counter is roll-over and start from beginning
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unsigned long rollOver = this->getTick();
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if (rollOver < time_s)
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time_s = rollOver;
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if (time_s - this->getTick() > timeout_)
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return HX710B_TIMEOUT;
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// need delay;
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this->halt_(5);
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}
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return HX710B_OK;
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}
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