diff options
Diffstat (limited to 'fw/ina226.h')
| -rw-r--r-- | fw/ina226.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/fw/ina226.h b/fw/ina226.h new file mode 100644 index 0000000..ffb9f54 --- /dev/null +++ b/fw/ina226.h @@ -0,0 +1,108 @@ +#ifndef __INA226_H__ +#define __INA226_H__ + +#include <stdint.h> +#include <stdbool.h> +#include <limits.h> +#include "i2c.h" + +/* Fixed values from datasheet */ +#define INA226_VB_LSB_uV 1250 +#define INA226_VS_LSB_nV 2500 + +enum ina226_reg { + INA226_REG_CONFIG = 0x00, + INA226_REG_VS = 0x01, + INA226_REG_VB = 0x02, + INA226_REG_P = 0x03, + INA226_REG_I = 0x04, + INA226_REG_CAL = 0x05, + INA226_REG_MASK_EN = 0x06, + INA226_REG_ALERT = 0x07, + INA226_REG_MFGID = 0xfe, + INA226_REG_DIEID = 0xff +}; + +enum ina226_config { + INA226_CONFIG_RST = 1<<15, + + INA226_CONFIG_AVG_Pos = 9, + INA226_CONFIG_AVG_Msk = 3<<9, + INA226_CONFIG_AVG_1 = 0<<9, + INA226_CONFIG_AVG_4 = 1<<9, + INA226_CONFIG_AVG_16 = 2<<9, + INA226_CONFIG_AVG_64 = 3<<9, + INA226_CONFIG_AVG_128 = 4<<9, + INA226_CONFIG_AVG_256 = 5<<9, + INA226_CONFIG_AVG_512 = 6<<9, + INA226_CONFIG_AVG_1024 = 7<<9, + + INA226_CONFIG_VBUSCT_Pos = 6, + INA226_CONFIG_VBUSCT_Msk = 7<<6, + INA226_CONFIG_VBUSCT_140u = 0<<6, + INA226_CONFIG_VBUSCT_204u = 1<<6, + INA226_CONFIG_VBUSCT_332u = 2<<6, + INA226_CONFIG_VBUSCT_588u = 3<<6, + INA226_CONFIG_VBUSCT_1m1 = 4<<6, + INA226_CONFIG_VBUSCT_2m116 = 5<<6, + INA226_CONFIG_VBUSCT_4m156 = 6<<6, + INA226_CONFIG_VBUSCT_8m244 = 7<<6, + + INA226_CONFIG_VSHCT_Pos = 3, + INA226_CONFIG_VSHCT_Msk = 7<<3, + INA226_CONFIG_VSHCT_140u = 0<<3, + INA226_CONFIG_VSHCT_204u = 1<<3, + INA226_CONFIG_VSHCT_332u = 2<<3, + INA226_CONFIG_VSHCT_588u = 3<<3, + INA226_CONFIG_VSHCT_1m1 = 4<<3, + INA226_CONFIG_VSHCT_2m116 = 5<<3, + INA226_CONFIG_VSHCT_4m156 = 6<<3, + INA226_CONFIG_VSHCT_8m244 = 7<<3, + + INA226_CONFIG_MODE_Pos = 0, + INA226_CONFIG_MODE_Msk = 7, + INA226_CONFIG_MODE_POWERDOWN = 0, + + INA226_CONFIG_MODE_SHUNT = 1, + + INA226_CONFIG_MODE_BUS = 2, + + INA226_CONFIG_MODE_TRIG = 0, + INA226_CONFIG_MODE_CONT = 4 +}; + +enum ina226_mask_en { + INA226_MASK_EN_SOL = 1<<15, + INA226_MASK_EN_SUL = 1<<14, + INA226_MASK_EN_BOL = 1<<13, + INA226_MASK_EN_BUL = 1<<12, + INA226_MASK_EN_POL = 1<<11, + INA226_MASK_EN_CNVR = 1<<10, + INA226_MASK_EN_AFF = 1<<4, + INA226_MASK_EN_CVRF = 1<<3, + INA226_MASK_EN_OVF = 1<<2, + INA226_MASK_EN_APOL = 1<<1, + INA226_MASK_EN_LEN = 1<<0 +}; + +struct ina226 { + I2C_TypeDef *i2c_periph; + uint8_t i2c_addr; + uint16_t rs_uOhm; + uint16_t conv_config; + uint16_t i_lsb_uA; + bool conv_ready:1; +}; + +/* High-level API */ +void ina226_init(struct ina226 *dev, I2C_TypeDef *i2c_periph, uint8_t i2c_addr, uint16_t rs_uOhm, uint16_t conv_config); +void ina226_trigger(struct ina226 *dev, int mode); +bool ina226_conv_ready(struct ina226 *dev); +int ina226_read_raw(struct ina226 *dev, int16_t *I_raw, int16_t *V_raw, int16_t *Vs_raw); +int ina226_read_scaled(struct ina226 *dev, int16_t *I_mA, int16_t *V_mV, int16_t *Vs_uV); + +/* Low-level API */ +void ina226_write_reg(struct ina226 *dev, uint8_t reg, uint16_t val); +uint16_t ina226_read_reg(struct ina226 *dev, uint8_t reg); + +#endif /* __INA226_H__ */ |