氣壓bst-bmp280-ds001-10-閱讀-資料下載頁
2025-06-25 19:46本頁面
【正文】 Cb =總線電容在SDA行 所有其他的命名是指I178。(2000年1月)I178。C計時圖如圖12所示。表27給出相應的值。.上述I2C特定時間對應于以下內(nèi)部添加延遲:SDI和SCK輸入之間的輸入延遲:SDI比SCK延遲通常100 ns的標準和快速模式和一般20 ns高速模式。輸出延遲SCK下降沿SDI輸出傳播通常是140 ns標準和快速模式,通常在高速模式下70納秒。補償公式 32位// Returns temperature in DegC, resolution is DegC. Output value of “5123” equals DegC.// t_fine carries fine temperature as global valueBMP280_S32_t t_fine。BMP280_S32_t bmp280_pensate_T_int32(BMP280_S32_t adc_T){BMP280_S32_t var1, var2, T。var1 = ((((adc_T3) – ((BMP280_S32_t)dig_T11))) * ((BMP280_S32_t)dig_T2)) 11。var2 = (((((adc_T4) – ((BMP280_S32_t)dig_T1)) * ((adc_T4) – ((BMP280_S32_t)dig_T1))) 12) *((BMP280_S32_t)dig_T3)) 14。t_fine = var1 + var2。T = (t_fine * 5 + 128) 8。return T。}// Returns pressure in Pa as unsigned 32 bit integer. Output value of “96386” equals 96386 Pa = hPaBMP280_U32_t bmp280_pensate_P_int32(BMP280_S32_t adc_P){BMP280_S32_t var1, var2。BMP280_U32_t p。var1 = (((BMP280_S32_t)t_fine)1) – (BMP280_S32_t)64000。var2 = (((var12) * (var12)) 11 ) * ((BMP280_S32_t)dig_P6)。var2 = var2 + ((var1*((BMP280_S32_t)dig_P5))1)。var2 = (var22)+(((BMP280_S32_t)dig_P4)16)。var1 = (((dig_P3 * (((var12) * (var12)) 13 )) 3) + ((((BMP280_S32_t)dig_P2) * var1)1))18。var1 =((((32768+var1))*((BMP280_S32_t)dig_P1))15)。if (var1 == 0){return 0。 // avoid exception caused by division by zero}p = (((BMP280_U32_t)(((BMP280_S32_t)1048576)adc_P)(var212)))*3125。if (p 0x80000000){p = (p 1) / ((BMP280_U32_t)var1)。}else{p = (p / (BMP280_U32_t)var1) * 2。}var1 = (((BMP280_S32_t)dig_P9) * ((BMP280_S32_t)(((p3) * (p3))13)))12。var2 = (((BMP280_S32_t)(p2)) * ((BMP280_S32_t)dig_P8))13。p = (BMP280_U32_t)((BMP280_S32_t)p + ((var1 + var2 + dig_P7) 4))。return p。}64位 // Returns temperature in DegC, double precision. Output value of “” equals DegC.// t_fine carries fine temperature as global valueBMP280_S32_t t_fine。double bmp280_pensate_T_double(BMP280_S32_t adc_T){double var1, var2, T。var1 = (((double)adc_T)/ – ((double)dig_T1)/) * ((double)dig_T2)。var2 = ((((double)adc_T)/ – ((double)dig_T1)/) *(((double)adc_T)/ – ((double) dig_T1)/)) * ((double)dig_T3)。t_fine = (BMP280_S32_t)(var1 + var2)。T = (var1 + var2) / 。return T。}// Returns pressure in Pa as double. Output value of “” equals Pa = hPadouble bmp280_pensate_P_double(BMP280_S32_t adc_P){double var1, var2, p。var1 = ((double)t_fine/) – 。var2 = var1 * var1 * ((double)dig_P6) / 。var2 = var2 + var1 * ((double)dig_P5) * 。var2 = (var2/)+(((double)dig_P4) * )。var1 = (((double)dig_P3) * var1 * var1 / + ((double)dig_P2) * var1) / 。var1 = ( + var1 / )*((double)dig_P1)。if (var1 == ){return 0。 // avoid exception caused by division by zero}p = – (double)adc_P。p = (p – (var2 / )) * / var1。var1 = ((double)dig_P9) * p * p / 。var2 = p * ((double)dig_P8) / 。p = p + (var1 + var2 + ((double)dig_P7)) / 。return p。} 以上是本人使用數(shù)據(jù)手冊時，簡單翻譯，如果有誤，望指出，輕噴，謝謝
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