embox

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/**
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 * @file
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 * @brief
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 *
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 * @date 21.04.2023
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 * @author Andrew Bursian
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 */
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#include <unistd.h>
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#include <util/log.h>
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#include "hts221.h"
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#include "hts221_transfer.h"
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#define HTS221_WHO_AM_I		0xf
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#define HTS221_AV_CONF_REG	0x10
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#define HTS221_CTRL_REG(i)	(0x20 + i - 1)
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#define HTS221_STATUS_REG	0x27
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#define HTS221_HUMIDITY_OUT_L	0x28
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#define HTS221_HUMIDITY_OUT_H	0x29
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#define HTS221_TEMP_OUT_L	0x2A
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#define HTS221_TEMP_OUT_H	0x2B
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#define HTS221_H0_RH_X2		0x30
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#define HTS221_H1_RH_X2		0x31
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#define HTS221_T0_DEGC_X8	0x32
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#define HTS221_T1_DEGC_X8	0x33
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#define HTS221_T0_1_DEGC_X8_MSB	0x35
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#define HTS221_H0_OUT_L		0x36
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#define HTS221_H0_OUT_H		0x37
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#define HTS221_H1_OUT_L		0x3a
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#define HTS221_H1_OUT_H		0x3b
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#define HTS221_T0_OUT_L		0x3c
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#define HTS221_T0_OUT_H		0x3d
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#define HTS221_T1_OUT_L		0x3e
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#define HTS221_T1_OUT_H		0x3f
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#define HTS221_WHO_AM_I_VALUE 0xbc
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extern struct hts221_dev hts221_dev0;
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static int16_t H0_rH_x2, dH_rH_x2, H0, dH, T0_degC_x8, dT_degC_x8, T0, dT;
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int16_t hts221_get_humidity(void) {
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	uint8_t l, h;
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	int32_t H;
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	struct hts221_dev *dev = &hts221_dev0;
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	hts221_readb(dev, HTS221_HUMIDITY_OUT_L, &l);
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	hts221_readb(dev, HTS221_HUMIDITY_OUT_H, &h);
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	H = l | (int16_t) (h << 8);
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	return ((H - H0) * dH_rH_x2 + (int32_t)dH * H0_rH_x2 + dH) / (2 * dH);
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}
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int16_t hts221_get_temp_x10(void) {
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	uint8_t l, h;
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	int32_t T;
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	struct hts221_dev *dev = &hts221_dev0;
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	hts221_readb(dev, HTS221_TEMP_OUT_L, &l);
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	hts221_readb(dev, HTS221_TEMP_OUT_H, &h);
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	T = l | (int16_t) (h << 8);
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	return (((T - T0) * dT_degC_x8 + (int32_t)dT * T0_degC_x8) * 5 + 2 * dT) / (4 * dT);
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}
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int hts221_init(void) {
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	int i;
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	uint8_t tmp;
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	struct hts221_dev *dev = &hts221_dev0;
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	if (hts221_hw_init(dev) < 0) {
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		log_error("HTS221 hw init failed!");
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		return -1;
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	}
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	if (hts221_readb(dev, HTS221_WHO_AM_I, &tmp) < 0) {
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		log_error("HTS221 readb failed!");
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		return -1;
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	}
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	log_info("WHO_AM_I = 0x%02x", tmp);
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	if (tmp != HTS221_WHO_AM_I_VALUE) {
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		log_error("HTS221 Device ID mismatch! %2x", tmp);
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		return -1;
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	}
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	tmp = 0x3;		/* Humidity average number is 32 */
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	tmp |= (0x3 << 3);	/* Temperature average number is 16 */
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	hts221_writeb(dev, HTS221_AV_CONF_REG, tmp);
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	tmp = 0x1;		/* Output data rate is 1 Hz */
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	tmp |= (1 << 2);	/* Block data update until MSB reading after LSB */
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	tmp |= (1 << 7);	/* Active mode */
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	hts221_writeb(dev, HTS221_CTRL_REG(1), tmp);
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	for (i = 1; i <= 3; i++) {
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		hts221_readb(dev, HTS221_CTRL_REG(i), &tmp);
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		log_info("CTRL_REG%d = 0x%02x", i, tmp);
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	}
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	hts221_readb(dev, HTS221_STATUS_REG, &tmp);
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	log_info("STATUS_REG = 0x%02x", tmp);
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	hts221_readb(dev, HTS221_H0_RH_X2, &tmp);
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	H0_rH_x2 = tmp;
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	hts221_readb(dev, HTS221_H1_RH_X2, &tmp);
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	dH_rH_x2 = tmp-H0_rH_x2;
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	hts221_readb(dev, HTS221_H0_OUT_L, &tmp);
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	H0 = tmp;
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	hts221_readb(dev, HTS221_H0_OUT_H, &tmp);
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	H0 |= (int16_t)tmp<<8;
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	hts221_readb(dev, HTS221_H1_OUT_L, &tmp);
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	dH = tmp;
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	hts221_readb(dev, HTS221_H1_OUT_H, &tmp);
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	dH |= (int16_t)tmp<<8;
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	dH -= H0;
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	hts221_readb(dev, HTS221_T0_DEGC_X8, &tmp);
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	T0_degC_x8 = tmp;
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	hts221_readb(dev, HTS221_T1_DEGC_X8, &tmp);
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	dT_degC_x8 = tmp;
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	hts221_readb(dev, HTS221_T0_1_DEGC_X8_MSB, &tmp);
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	T0_degC_x8 |= (((uint16_t)tmp&0x3)<<8);
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	dT_degC_x8 |= (((uint16_t)tmp&0xc)<<6);
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	dT_degC_x8 -= T0_degC_x8;
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	hts221_readb(dev, HTS221_T0_OUT_L, &tmp);
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	T0 = tmp;
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	hts221_readb(dev, HTS221_T0_OUT_H, &tmp);
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	T0 |= (int16_t)tmp<<8;
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	hts221_readb(dev, HTS221_T1_OUT_L, &tmp);
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	dT = tmp;
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	hts221_readb(dev, HTS221_T1_OUT_H, &tmp);
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	dT |= (int16_t)tmp<<8;
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	dT -= T0;
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	return 0;
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}
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