dnutiu/bme680-rust
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make look-up table static

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Denis-Cosmin Nutiu 2024-11-16 17:13:50 +02:00
parent bd54956320
commit 300bd90f8e
1 changed files with 40 additions and 38 deletions
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78
src/calculation.rs
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@ -4,6 +4,44 @@ use core::time::Duration;
/// Calculates values needed or returned by the BME80 Sensor. /// Calculates values needed or returned by the BME80 Sensor.
pub struct Calculation {} pub struct Calculation {}
static GAS_LOOKUP_TABLE_1: [u32; 16] = [
2147483647u32,
2147483647u32,
2147483647u32,
2147483647u32,
2147483647u32,
2126008810u32,
2147483647u32,
2130303777u32,
2147483647u32,
2147483647u32,
2143188679u32,
2136746228u32,
2147483647u32,
2126008810u32,
2147483647u32,
2147483647u32,
];
static GAS_LOOKUP_TABLE_2: [u32; 16] = [
4096000000u32,
2048000000u32,
1024000000u32,
512000000u32,
255744255u32,
127110228u32,
64000000u32,
32258064u32,
16016016u32,
8000000u32,
4000000u32,
2000000u32,
1,
500000u32,
250000u32,
125000u32,
];
impl Calculation { impl Calculation {
/// Calculates and returns the sensor's heater resistance. /// Calculates and returns the sensor's heater resistance.
/// * `calibration_data` - The calibration data of the sensor. /// * `calibration_data` - The calibration data of the sensor.
@ -154,47 +192,11 @@ impl Calculation {
gas_resistance_adc: u16, gas_resistance_adc: u16,
gas_range: u8, gas_range: u8,
) -> u32 { ) -> u32 {
let lookup_table1: [u32; 16] = [
2147483647u32,
2147483647u32,
2147483647u32,
2147483647u32,
2147483647u32,
2126008810u32,
2147483647u32,
2130303777u32,
2147483647u32,
2147483647u32,
2143188679u32,
2136746228u32,
2147483647u32,
2126008810u32,
2147483647u32,
2147483647u32,
];
let lookup_table2: [u32; 16] = [
4096000000u32,
2048000000u32,
1024000000u32,
512000000u32,
255744255u32,
127110228u32,
64000000u32,
32258064u32,
16016016u32,
8000000u32,
4000000u32,
2000000u32,
1,
500000u32,
250000u32,
125000u32,
];
let var1: i64 = ((1340 + 5 * calibration_data.range_sw_err as i64) let var1: i64 = ((1340 + 5 * calibration_data.range_sw_err as i64)
* lookup_table1[gas_range as usize] as i64) * GAS_LOOKUP_TABLE_1[gas_range as usize] as i64)
>> 16; >> 16;
let var2: u64 = (((gas_resistance_adc as i64) << 15) - 16777216 + var1) as u64; let var2: u64 = (((gas_resistance_adc as i64) << 15) - 16777216 + var1) as u64;
let var3: i64 = (lookup_table2[gas_range as usize] as i64 * var1) >> 9; let var3: i64 = (GAS_LOOKUP_TABLE_2[gas_range as usize] as i64 * var1) >> 9;
let calc_gas_res: u32 = ((var3 + ((var2 as i64) >> 1i64)) / var2 as i64) as u32; let calc_gas_res: u32 = ((var3 + ((var2 as i64) >> 1i64)) / var2 as i64) as u32;
calc_gas_res calc_gas_res
} }