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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| FLipWare - AsTeRICS Foundation | ||
| For more info please visit: https://www.asterics-foundation.org | ||
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| Module: NAU7802.h - register definitions for the NAU7802 sensor chip | ||
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| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; See the GNU General Public License: | ||
| http://www.gnu.org/licenses/gpl-3.0.en.html | ||
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| */ | ||
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| #ifndef _NAU7802_H_ | ||
| #define _NAU7802_H_ | ||
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| /** fwd declarations */ | ||
| static inline uint8_t readNAURegister(uint8_t reg_addr); | ||
| static inline uint32_t readNAUADC(); | ||
| static inline void writeNAURegister(uint8_t reg_addr, uint8_t val); | ||
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| static inline uint8_t readNAURegister(uint8_t reg_addr) | ||
| { | ||
| Wire.beginTransmission(i2c_addr); | ||
| Wire.write(reg_addr); | ||
| Wire.requestFrom(i2c_addr,1); | ||
| Wire.endTransmission(); | ||
| delayMicroseconds(100); | ||
| return Wire.read(); | ||
| } | ||
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| static inline uint32_t readNAUADC() | ||
| { | ||
| Wire.beginTransmission(i2c_addr); | ||
| Wire.write(NAU7802_OUTPUT); | ||
| Wire.requestFrom(i2c_addr,3); | ||
| Wire.endTransmission(); | ||
| delayMicroseconds(100); | ||
| uint32_t val = Wire.read(); | ||
| val |= Wire.read() << 8; | ||
| val |= Wire.read() << 16; | ||
| return val; | ||
| } | ||
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| static inline void writeNAURegister(uint8_t reg_addr, uint8_t val) | ||
| { | ||
| Wire.beginTransmission(i2c_addr); | ||
| Wire.write(reg_addr); | ||
| Wire.write(val); | ||
| Wire.endTransmission(); | ||
| } | ||
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| //NAU7802 startup sequence | ||
| writeNAURegister(NAU7802_PU_CTRL,1); //set register reset | ||
| delay(10); | ||
| writeNAURegister(NAU7802_PU_CTRL,0); //clear register reset | ||
| delayMicroseconds(200); //wait, then check the pwr up bit | ||
| for(uint8_t i = 0; i<4; i++) { //do 4 retries | ||
| if(readNAURegister(NAU7802_PU_CTRL) & (1<<3)) | ||
| { | ||
| #ifdef DEBUG_OUTPUT_SENSORS | ||
| Serial.println("SEN: NAU7802 powered up"); | ||
| #endif | ||
| break; | ||
| } | ||
| delay(10); | ||
| if(i == 3) { | ||
| Serial.println("SEN: error, NAU7802 not powering up!"); | ||
| return; | ||
| } | ||
| } | ||
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| //enable digital | ||
| writeNAURegister(NAU7802_PU_CTRL, (1<<1)); | ||
| //enable analog + digital | ||
| writeNAURegister(NAU7802_PU_CTRL, (1<<2)|(1<<1)); | ||
| //wait | ||
| delay(600); | ||
| //setup LDO / gain | ||
| writeNAURegister(NAU7802_CTRL1, NAU7802_LDO_30 | NAU7802_PGA_128); | ||
| //set sampling rate to 320SPS. | ||
| writeNAURegister(NAU7802_CTRL2, NAU7802_SPS_320); | ||
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| /** | ||
| * @brief I2C address of the NAU7802 | ||
| */ | ||
| #define NAU7802_ADDR 0b00101010 | ||
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| /** Power control */ | ||
| #define NAU7802_PU_CTRL 0x00 | ||
| /** Config/Ctrl 1 */ | ||
| #define NAU7802_CTRL1 0x01 | ||
| /** Config/Ctrl 2 */ | ||
| #define NAU7802_CTRL2 0x02 | ||
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| /** 0x03-0x05: channel 1 offset calib */ | ||
| /** 0x06-0x09: channel 1 gain ctrl */ | ||
| /** 0x0A-0x0C: channel 2 offset calib */ | ||
| /** 0x0D-0x10: channel 2 gain ctrl */ | ||
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| /** I2C ctrl */ | ||
| #define NAU7802_I2CCTRL 0x11 | ||
| /** ADC output LSB / starting address */ | ||
| #define NAU7802_OUTPUT 0x12 | ||
| /** ADC ctrl */ | ||
| #define NAU7802_ADCCTRL 0x15 | ||
| /** PGA ctrl */ | ||
| #define NAU7802_PGACTRL 0x1B | ||
| /** Power ctrl */ | ||
| #define NAU7802_POWER 0x1C | ||
| /** Revision ID */ | ||
| #define NAU7802_ID 0x1F | ||
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| /***** LDO settings *****/ | ||
| #define NAU7802_LDO_33 ((0b100)<<3) | ||
| #define NAU7802_LDO_30 ((0b101)<<3) | ||
| #define NAU7802_LDO_27 ((0b110)<<3) | ||
| #define NAU7802_LDO_24 ((0b111)<<3) | ||
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| /***** gain settings *****/ | ||
| #define NAU7802_PGA_128 0b111 | ||
| #define NAU7802_PGA_64 0b110 | ||
| #define NAU7802_PGA_32 0b101 | ||
| #define NAU7802_PGA_16 0b100 | ||
| #define NAU7802_PGA_8 0b011 | ||
| #define NAU7802_PGA_4 0b010 | ||
| #define NAU7802_PGA_2 0b001 | ||
| #define NAU7802_PGA_1 0b000 | ||
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| /***** sampling rate *****/ | ||
| #define NAU7802_SPS_320 ((0b111)<<4) | ||
| #define NAU7802_SPS_80 ((0b011)<<4) | ||
| #define NAU7802_SPS_40 ((0b010)<<4) | ||
| #define NAU7802_SPS_20 ((0b001)<<4) | ||
| #define NAU7802_SPS_10 ((0b000)<<4) | ||
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| #endif /*_NAU7802_H_*/ |
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