temp_sensor.c

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// Copyright (C) 2013-2026 Efinix Inc. All rights reserved.
// Full license header bsp/efinix/EfxSapphireSocRV64/include/LICENSE.MD

 
#include "sensor/temp_sensor/temp_sensor.h"
 
/* -----------------------------------------------------------------------------*/
/*  Common API: Helper                                          
/* -----------------------------------------------------------------------------*/
 
u8 temp_readTempReg(temp_sensor_instance_t *temp, const u8 reg)
{
    u8 data = 0;
    if (temp && temp->inst) {
        i2c_setMux(temp->inst, 0x0F);
        i2c_readData_b(temp->inst, reg, &data, 1);
    }
    return data;
}
 
u8 temp_writeTempReg(temp_sensor_instance_t *temp, const u8 reg, const u8 data)
{
    if (temp && temp->inst) {
        i2c_setMux(temp->inst, 0x0F); 
        i2c_writeData_b(temp->inst, reg, (u8*)&data, 1);
        return TEMP_SENSOR_OK;
    }
    return TEMP_SENSOR_SKIP;
}
 
float calculate_temp_celsius(u8 hb, u8 lb, u8 is_extended) {
    int16_t integer_part = hb;
 
    // Apply Offset (Extended: -64 to 191)
    if (is_extended) {
        integer_part -= 64;
    }
 
    // Calculate Fractional Part (0.125 steps)
    float fractional = (lb >> 5) * 0.125f;
    return (float)integer_part + fractional;
}
 
u8 encode_temp_limit(float val, u8 is_extended, u8 *out_hb, u8 *out_lb) {
    // Handle Offset
    if (is_extended) {
        val += 64.0f;
    }
 
    // Extract Integer Part
    int integer_part = (int)val;
    if (integer_part < 0) integer_part = 0;     // Clamp min
    if (integer_part > 255) integer_part = 255; // Clamp max
    *out_hb = (u8)integer_part;
 
    // Extract Fractional Part
    float fraction = val - integer_part;
    if (fraction < 0) fraction = 0;
    u8 frac_bits = (u8)(fraction * 8.0f);
    *out_lb = (frac_bits << 5); 
    return TEMP_SENSOR_OK;
}