X-Git-Url: http://git.smho.de/gw/?p=owSlave2.git;a=blobdiff_plain;f=common%2FI2C%2FSGP30.c;fp=common%2FI2C%2FSGP30.c;h=ee19d6a6d031ecf4e223b02d6a7d410f0c14647f;hp=0000000000000000000000000000000000000000;hb=2490e261a78b2a98ee2a9b8fc19cb3f20225926b;hpb=45806622c08cded7d77c9c9735c433de5f7fa027

diff --git a/common/I2C/SGP30.c b/common/I2C/SGP30.c
new file mode 100644
index 0000000..ee19d6a
--- /dev/null
+++ b/common/I2C/SGP30.c
@@ -0,0 +1,228 @@
+// Copyright (c) 2017, Tobias Mueller tm(at)tm3d.de
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the
+//    distribution.
+//  * All advertising materials mentioning features or use of this
+//    software must display the following acknowledgement: This product
+//    includes software developed by tm3d.de and its contributors.
+//  * Neither the name of tm3d.de nor the names of its contributors may
+//    be used to endorse or promote products derived from this software
+//    without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#ifdef  __4MHZ__
+#define F_CPU 4000000UL
+#else
+#define F_CPU 8000000UL
+#endif
+#include <avr/io.h>
+
+
+#include <util/delay.h>
+#include <avr/pgmspace.h>
+
+#include "USI_TWI_Master.h"
+#include "SGP30.h"
+//0x58
+#define WC 0b10110000
+#define RC 0b10110001
+#define CRC8_POLYNOMIAL             0x31
+#define CRC8_INIT                   0xFF
+#define CRC8_LEN                    1
+
+
+uint8_t sensirion_common_generate_crc(uint8_t *data, uint8_t count)
+{
+	uint16_t current_byte;
+	uint8_t crc = CRC8_INIT;
+	uint8_t crc_bit;
+
+	/* calculates 8-Bit checksum with given polynomial */
+	for (current_byte = 0; current_byte < count; ++current_byte) {
+		crc ^= (data[current_byte]);
+		for (crc_bit = 8; crc_bit > 0; --crc_bit) {
+			if (crc & 0x80)
+			crc = (crc << 1) ^ CRC8_POLYNOMIAL;
+			else
+			crc = (crc << 1);
+		}
+	}
+	return crc;
+}
+
+int8_t sensirion_common_check_crc(uint8_t *data, uint8_t count, uint8_t checksum)
+{
+	if (sensirion_common_generate_crc(data, count) != checksum)
+	return 0;
+	return 1;
+}
+
+void readSGPXX(uint16_t com, uint8_t* data, uint8_t len) {
+	I2c_StartCondition();
+	I2c_WriteByte(WC);
+	I2c_WriteByte(com>>8);  //Ctrl hum
+	I2c_WriteByte(com&0x00FF);  //Ctrl hum
+	_delay_ms(100);
+	I2c_StartCondition();
+	I2c_WriteByte (RC);
+	for(uint8_t i=0;i<len-1;i++) {
+		data[i]=I2c_ReadByte(ACK);
+	}
+	data[len-1]=I2c_ReadByte(NO_ACK);
+	I2c_StopCondition();
+}
+
+void writeSGPXX(uint16_t com, uint8_t* data, uint8_t len) {
+	I2c_StartCondition();
+	I2c_WriteByte(WC);
+	I2c_WriteByte(com>>8);  //Ctrl hum
+	I2c_WriteByte(com&0x00FF);  //Ctrl hum
+	for(uint8_t i=0;i<len;i++) {
+		I2c_WriteByte(data[i]);
+	}
+	I2c_StopCondition();
+}
+
+
+
+
+
+uint16_t bl1S=0,bl2S=0;
+
+uint16_t getbl=1000;
+
+
+int8_t check_convert_buf(uint8_t *b,uint16_t *v1,uint16_t *v2) {
+	int8_t ret=1;
+	if (sensirion_common_check_crc(b,2,b[2])) {	*v1=((int16_t)b[0])<<8|b[1];} else {*v1=0;ret=0;}
+	if (sensirion_common_check_crc(b+3,2,b[5])) {*v2=((int16_t)b[3])<<8|b[4];} else {*v2=0;ret=0;}
+	return ret;
+}
+
+
+
+uint16_t readEEPROM(uint8_t addr,uint16_t def) {
+	uint16_t hr;
+	EEARH=0;
+	while(EECR & (1<<EEPE));
+	EEARL=addr+1;
+	EECR |= (1<<EERE);
+	hr=EEDR;
+	if (hr!=0xFF) {
+		hr=hr<<8;
+		while(EECR & (1<<EEPE));
+		EEARL=addr;
+		EECR |= (1<<EERE);
+		hr|=EEDR;
+		return hr;
+	}
+	return def;
+}
+
+void writeEEPROM(uint8_t addr,uint16_t val) {
+	EEARH=0;
+	while(EECR & (1<<EEPE));
+	EECR = (0<<EEPM1)|(0<<EEPM0);
+	EEARL = addr;
+	EEDR = val&0xFF;
+	EECR |= (1<<EEMPE);
+	EECR |= (1<<EEPE);
+	while(EECR & (1<<EEPE));
+	EECR = (0<<EEPM1)|(0<<EEPM0);
+	EEARL = addr+1;
+	EEDR = val>>8;
+	EECR |= (1<<EEMPE);
+	EECR |= (1<<EEPE);
+}
+
+void save_baseline(uint16_t b1,uint16_t b2 ) {
+	writeEEPROM(0,b1);
+	writeEEPROM(2,b2);
+}
+
+void read_baseline(uint16_t *b1,uint16_t *b2) {
+	*b1=readEEPROM(0,0xFFFF);
+	*b2=readEEPROM(2,0xFFFF);
+}
+
+void set_baseline(uint16_t b1,uint16_t b2) {
+	uint8_t b[10];
+	b[3]=(uint16_t)b1>>8;  //irgendwie werden die Werte vertauscht zwischen lesen und schreiben
+	b[4]=(uint16_t)b1&0x00FF;
+	b[5]=sensirion_common_generate_crc(b+3,2);
+	b[0]=(uint16_t)b2>>8;
+	b[1]=(uint16_t)b2&0x00FF;
+	b[2]=sensirion_common_generate_crc(b,2);
+	writeSGPXX(0x201e,b,6);
+	bl1S=b1;
+	bl2S=b2;
+}
+
+int8_t initSGP30() {
+	uint8_t b[10];
+	readSGPXX(0x2032,b,3);
+	_delay_ms(300);
+	writeSGPXX(0x2003,0,0);
+	_delay_ms(10);
+	uint16_t b1=0,b2=0;
+	//set_baseline(0x2210,0x3320);
+	//readSGPXX(0x2015,b,6);
+	read_baseline(&b1,&b2);
+	if (b1!=0xFFFF) {
+		set_baseline(b1,b2);
+		//readSGPXX(0x2015,b,6);
+		//uint16_t bl1,bl2;
+		//check_convert_buf(b,&bl1,&bl2);
+		
+	}
+	return 0x1;
+
+}
+
+void runSGP30(uint16_t *CO2,uint16_t *VOC,uint16_t *ETH,uint16_t *H2){
+	uint8_t b[10];
+	readSGPXX(0x2008,b,6);
+	check_convert_buf(b,CO2,VOC);
+	getbl--;
+	if (getbl==0) {
+		uint8_t eq=1;
+		readSGPXX(0x2015,b,6);
+		uint16_t bl1,bl2;
+		check_convert_buf(b,&bl1,&bl2);
+		int8_t bl1d=bl1-bl1S;
+		int8_t bl2d=bl2-bl2S;
+		if (bl1d<0) bl1d=-bl1d;
+		if (bl2d<0) bl2d=-bl2d;
+		if (bl1d>4) {bl1S=bl1;eq=0;}
+		if (bl2d>4) {bl2S=bl2;eq=0;}
+		getbl=200;  //Naechste bruefunf in 100 s
+		if (eq==0) {
+			*VOC+=1000;
+			save_baseline(bl1,bl2);
+		} 
+	}
+	readSGPXX(0x2050,b,6);
+	check_convert_buf(b,ETH,H2);
+
+}
+
+