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sensor: max17055: convert floating point operation to integer 

Convert a few floating point operation to fixed point. May save some
stack and some flash as well on soft-fp systems.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
This commit is contained in:
Fabio Baltieri 2023-08-01 16:47:45 +01:00 committed by Fabio Baltieri
parent 2f9b120860
commit fa2481e6fb
1 changed files with 5 additions and 5 deletions
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10
drivers/sensor/max17055/max17055.c
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@ -63,9 +63,9 @@ static int max17055_reg_write(const struct device *dev, uint8_t reg_addr,
* @param val Value to convert (taken from a MAX17055 register)
* @return corresponding value in milliamps
*/
static int current_to_ma(unsigned int rsense_mohms, int16_t val)
static int current_to_ma(uint16_t rsense_mohms, int16_t val)
{
return (val * 1.5625) / rsense_mohms;
return (int32_t)val * 25 / rsense_mohms / 16; /* * 1.5625 */
}
/**
@ -75,9 +75,9 @@ static int current_to_ma(unsigned int rsense_mohms, int16_t val)
* @param val Value in mA to convert
* @return corresponding value in MAX17055 units, ready to write to a register
*/
static int current_ma_to_max17055(unsigned int rsense_mohms, uint16_t val)
static int current_ma_to_max17055(uint16_t rsense_mohms, uint16_t val)
{
return val * rsense_mohms / 1.5625;
return (int32_t)val * rsense_mohms * 16 / 25; /* / 1.5625 */
}
/**
@ -119,7 +119,7 @@ static int capacity_to_max17055(unsigned int rsense_mohms, uint16_t val_mha)
*/
static int voltage_mV_to_max17055(uint16_t val_mv)
{
return val_mv * 16 / 1.25;
return (val_mv * 16) * 10 / 8; /* * 1.25 */
}
static void set_millis(struct sensor_value *val, int val_millis)