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bdk: max17050: simplify calculations

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And make current readings a tiny bit (±0.16%) more accurate.
This commit is contained in:
CTCaer
2025-12-31 03:44:44 +02:00
parent 520bce08cf
commit 800bec2ec2
2 changed files with 12 additions and 19 deletions
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20
bdk/power/max17050.c
View File

@@ -26,7 +26,13 @@
#include <soc/i2c.h>
#include <soc/timer.h>
#define BASE_SNS_UOHM 5000
/* Board default values */
#define BOARD_CGAIN 2 /* Actual: 1.99993 */
#define BOARD_RSENSE_MOHM 5 /* 0.005 Ohm */
#define ADJ_RSENSE_MOHM (BOARD_RSENSE_MOHM * BOARD_CGAIN) /* 0.01 Ohm */
/* Consider RepCap which is less then 10 units below FullCAP full */
#define FULL_THRESHOLD 10
/* Status register bits */
#define STATUS_POR_BIT BIT(1)
@@ -108,15 +114,15 @@ int max17050_get_property(enum MAX17050_reg reg, int *value)
break;
case MAX17050_DesignCap: // Charge full design.
data = max17050_get_reg(MAX17050_DesignCap);
*value = data * (BASE_SNS_UOHM / MAX17050_BOARD_SNS_RESISTOR_UOHM) / MAX17050_BOARD_CGAIN;
*value = (u32)data * 5 / ADJ_RSENSE_MOHM; /* Units of LSB = 5uVh / Rsense = 0.5mAh */
break;
case MAX17050_FullCAP: // Charge full.
data = max17050_get_reg(MAX17050_FullCAP);
*value = data * (BASE_SNS_UOHM / MAX17050_BOARD_SNS_RESISTOR_UOHM) / MAX17050_BOARD_CGAIN;
*value = (u32)data * 5 / ADJ_RSENSE_MOHM; /* Units of LSB = 5uVh / Rsense = 0.5mAh */
break;
case MAX17050_RepCap: // Charge now.
data = max17050_get_reg(MAX17050_RepCap);
*value = data * (BASE_SNS_UOHM / MAX17050_BOARD_SNS_RESISTOR_UOHM) / MAX17050_BOARD_CGAIN;
*value = (u32)data * 5 / ADJ_RSENSE_MOHM; /* Units of LSB = 5uVh / Rsense = 0.5mAh */
break;
case MAX17050_TEMP: // Temp.
data = max17050_get_reg(MAX17050_TEMP);
@@ -125,13 +131,11 @@ int max17050_get_property(enum MAX17050_reg reg, int *value)
break;
case MAX17050_Current: // Current now.
data = max17050_get_reg(MAX17050_Current);
*value = (s16)data;
*value *= 1562500 / (MAX17050_BOARD_SNS_RESISTOR_UOHM * MAX17050_BOARD_CGAIN);
*value = (int)(s16)data * 15625 / ADJ_RSENSE_MOHM / 10; /* Units of LSB = 1.5625uV / Rsense = 156.25uA */
break;
case MAX17050_AvgCurrent: // Current avg.
data = max17050_get_reg(MAX17050_AvgCurrent);
*value = (s16)data;
*value *= 1562500 / (MAX17050_BOARD_SNS_RESISTOR_UOHM * MAX17050_BOARD_CGAIN);
*value = (int)(s16)data * 15625 / ADJ_RSENSE_MOHM / 10; /* Units of LSB = 1.5625uV / Rsense = 156.25uA */
break;
default:
return -1;

11
bdk/power/max17050.h
View File

@@ -25,17 +25,6 @@
#include <utils/types.h>
/* Board default values */
#define MAX17050_BOARD_CGAIN 2 /* Actual: 1.99993 */
#define MAX17050_BOARD_SNS_RESISTOR_UOHM 5000 /* 0.005 Ohm */
#define MAX17050_STATUS_BattAbsent BIT(3)
/* Consider RepCap which is less then 10 units below FullCAP full */
#define MAX17050_FULL_THRESHOLD 10
#define MAX17050_CHARACTERIZATION_DATA_SIZE 48
#define MAXIM17050_I2C_ADDR 0x36
enum MAX17050_reg {