44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
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#include "max17048.h"
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#include "esp_err.h"
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#include "i2c.h"
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#include "esp_timer.h"
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static const char *TAG = "BATTERY";
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uint8_t established_soc;
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esp_err_t max17048_init() {
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esp_err_t err = ESP_OK;
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uint8_t status, _;
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err |= i2c_init();
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err |= max17048_read_reg(MAX17048_REG_STATUS, &status, &_);
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err |= bms_set_alert_bound_voltages(3.3, 4.2);
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err |= bms_set_reset_voltage(3.25);
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err |= bms_set_alsc();
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err |= bms_clear_status();
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}
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// Helper: Function reading MAX17048 SOC register, returning battery percentage
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uint8_t bms_get_soc() {
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// uint16_t raw_soc, raw_vcell;
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uint16_t raw_soc;
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// Read SOC (Register 0x04)
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if (max17048_read_reg(MAX17048_REG_SOC, ((uint8_t*)&raw_soc)+1, (uint8_t*)&raw_soc) == ESP_OK) {
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return (raw_soc >> 8) + raw_soc & 0x80; // round to the nearest percent
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} else {
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ESP_LOGE(TAG, "Failed to read MAX17048");
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return 0;
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}
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}
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esp_err_t bms_set_alert_bound_voltages(float min, float max) {
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uint8_t minVal = (uint16_t)((float)min * 1000.0) / 20;
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uint8_t maxVal = (uint16_t)((float)max * 1000.0) / 20;
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return max17048_write_reg(MAX17048_REG_VALRT, minVal, maxVal);
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}
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esp_err_t bms_set_reset_voltage(float vreset) {
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uint8_t maxVal = (uint16_t)((float)vreset * 1000.0) / 40;
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max17048_write_reg(MAX17048_REG_VRST_ID, vreset, 0);
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}
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