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bme280_test.cpp
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bme280_test.cpp
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#include <xpcc/driver/pressure/bme280.hpp>
#include <xpcc/debug/logger/logger.hpp>
#include "bme280_test.hpp"
#undef XPCC_LOG_LEVEL
#define XPCC_LOG_LEVEL xpcc::log::DISABLED
void
Bme280Test::testConversion()
{
static constexpr size_t table_size = 4;
xpcc::bme280::DataDouble dataTable[table_size];
uint32_t adc_temp_min[table_size];
uint32_t adc_temp_max[table_size];
uint32_t adc_press_min[table_size];
uint32_t adc_press_max[table_size];
// Set of calibration constants read from an arbitrary chosen sensor (A)
dataTable[0].calibration.T1 = 28192;
dataTable[0].calibration.T2 = 26148;
dataTable[0].calibration.T3 = 50;
dataTable[0].calibration.P1 = 38104;
dataTable[0].calibration.P2 = -10853;
dataTable[0].calibration.P3 = 3024;
dataTable[0].calibration.P4 = 10657;
dataTable[0].calibration.P5 = 13;
dataTable[0].calibration.P6 = -7;
dataTable[0].calibration.P7 = 9900;
dataTable[0].calibration.P8 = -10230;
dataTable[0].calibration.P9 = 4285;
dataTable[0].calibration.H1 = 75;
dataTable[0].calibration.H2 = 359;
dataTable[0].calibration.H3 = 0;
dataTable[0].calibration.H4 = 326;
dataTable[0].calibration.H5 = 0;
dataTable[0].calibration.H6 = 30;
adc_temp_min[0] = 0x4ECA0;
adc_temp_max[0] = 0xB0AA0;
adc_press_min[0] = 0x01000;
adc_press_max[0] = 0xE0000;
// Set of calibration constants read from an arbitrary chosen sensor (B)
dataTable[1].calibration.T1 = 28533;
dataTable[1].calibration.T2 = 27194;
dataTable[1].calibration.T3 = 50;
dataTable[1].calibration.P1 = 38286;
dataTable[1].calibration.P2 = -10616;
dataTable[1].calibration.P3 = 3024;
dataTable[1].calibration.P4 = 4099;
dataTable[1].calibration.P5 = 40;
dataTable[1].calibration.P6 = -7;
dataTable[1].calibration.P7 = 9900;
dataTable[1].calibration.P8 = -10230;
dataTable[1].calibration.P9 = 4285;
dataTable[1].calibration.H1 = 75;
dataTable[1].calibration.H2 = 356;
dataTable[1].calibration.H3 = 0;
dataTable[1].calibration.H4 = 334;
dataTable[1].calibration.H5 = 0;
dataTable[1].calibration.H6 = 30;
adc_temp_min[1] = 0x51530;
adc_temp_max[1] = 0xAF720;
adc_press_min[1] = 0x01000;
adc_press_max[1] = 0xE0000;
// Sample data from BMP280 datasheet
dataTable[2].calibration.T1 = 27504;
dataTable[2].calibration.T2 = 26435;
dataTable[2].calibration.T3 = -1000;
dataTable[2].calibration.P1 = 36477;
dataTable[2].calibration.P2 = -10685;
dataTable[2].calibration.P3 = 3024;
dataTable[2].calibration.P4 = 2855;
dataTable[2].calibration.P5 = 140;
dataTable[2].calibration.P6 = -7;
dataTable[2].calibration.P7 = 15500;
dataTable[2].calibration.P8 = -14600;
dataTable[2].calibration.P9 = 6000;
adc_temp_min[2] = 519888;
adc_temp_max[2] = 519889;
adc_press_min[2] = 0x01000;
adc_press_max[2] = 0xE0000;
// Set of calibration constants from a Sparkfun screenshot
// https://learn.sparkfun.com/tutorials/sparkfun-bme280-breakout-hookup-guide
// https://cdn.sparkfun.com/assets/learn_tutorials/4/1/9/readall_output.png
// ADC Values from screenshot. Temperature is 25.13 degree Celsius.
dataTable[3].calibration.T1 = 27974;
dataTable[3].calibration.T2 = 26594;
dataTable[3].calibration.T3 = 50;
dataTable[3].calibration.P1 = 38207;
dataTable[3].calibration.P2 = -10702;
dataTable[3].calibration.P3 = 3024;
dataTable[3].calibration.P4 = 7917;
dataTable[3].calibration.P5 = -188;
dataTable[3].calibration.P6 = -7;
dataTable[3].calibration.P7 = 9900;
dataTable[3].calibration.P8 = -10230;
dataTable[3].calibration.P9 = 4285;
dataTable[3].calibration.H1 = 75;
dataTable[3].calibration.H2 = 358;
dataTable[3].calibration.H3 = 0;
dataTable[3].calibration.H4 = 328;
dataTable[3].calibration.H5 = 0;
dataTable[3].calibration.H6 = 30;
adc_temp_min[3] = 0x809F0;
adc_temp_max[3] = 0x809F0;
adc_press_min[3] = 0x62090;
adc_press_max[3] = 0x62090;
for (size_t jj = 0; jj < XPCC_ARRAY_SIZE(dataTable); ++jj)
{
xpcc::bme280::DataDouble* dataDouble;
dataDouble = &(dataTable[jj]);
// Fixed Point
xpcc::bme280::Data data;
// Copy calibration from double precision to fixed point
data.calibration.T1 = dataDouble->calibration.T1;
data.calibration.T2 = dataDouble->calibration.T2;
data.calibration.T3 = dataDouble->calibration.T3;
data.calibration.P1 = dataDouble->calibration.P1;
data.calibration.P2 = dataDouble->calibration.P2;
data.calibration.P3 = dataDouble->calibration.P3;
data.calibration.P4 = dataDouble->calibration.P4;
data.calibration.P5 = dataDouble->calibration.P5;
data.calibration.P6 = dataDouble->calibration.P6;
data.calibration.P7 = dataDouble->calibration.P7;
data.calibration.P8 = dataDouble->calibration.P8;
data.calibration.P9 = dataDouble->calibration.P9;
data.calibration.H1 = dataDouble->calibration.H1;
data.calibration.H2 = dataDouble->calibration.H2;
data.calibration.H3 = dataDouble->calibration.H3;
data.calibration.H4 = dataDouble->calibration.H4;
data.calibration.H5 = dataDouble->calibration.H5;
data.calibration.H6 = dataDouble->calibration.H6;
// Evaluate Temperature
uint32_t total_error = 0;
uint32_t max_error = 0;
XPCC_LOG_DEBUG.printf("ADC --double--\t--int--\t--error--\n");
for (uint32_t adc = adc_temp_min[jj]; adc <= adc_temp_max[jj]; ++adc)
{
dataDouble->raw[3] = adc >> 12;
dataDouble->raw[4] = adc >> 4;
dataDouble->raw[5] = adc << 4;
dataDouble->rawTemperatureTouched();
data.raw[3] = dataDouble->raw[3];
data.raw[4] = dataDouble->raw[4];
data.raw[5] = dataDouble->raw[5];
data.rawTemperatureTouched();
int32_t tempDouble = dataDouble->getTemperature();
int32_t temp = data.getTemperature();
int32_t error = tempDouble - temp;
XPCC_LOG_DEBUG.printf("%05" PRIx32 "\t%5" PRId32 "\t%5" PRId32 "\t%2" PRId32 "\n", adc, tempDouble, temp, error);
error = std::abs(error);
total_error += error;
if (uint32_t(error) > max_error) {
max_error = error;
}
}
XPCC_LOG_DEBUG.printf("== Errors ==\n");
XPCC_LOG_DEBUG.printf(" max = %" PRId32 "\n", max_error);
XPCC_LOG_DEBUG.printf(" sum = %" PRId32 "\n", total_error);
TEST_ASSERT_TRUE(total_error < 51000);
TEST_ASSERT_TRUE(max_error <= 1);
// Pressure
total_error = 0;
max_error = 0;
// Check pressure conversion at 10 different temperatures
uint32_t adc_temp_span = adc_temp_max[jj] - adc_temp_min[jj];
uint32_t adc_temp_step = adc_temp_span/10;
if (adc_temp_step == 0) {
adc_temp_step = 1;
}
for (uint32_t adc_temp = adc_temp_min[jj];
adc_temp <= adc_temp_max[jj];
adc_temp += adc_temp_step)
{
dataDouble->raw[3] = adc_temp >> 12;
dataDouble->raw[4] = adc_temp >> 4;
dataDouble->raw[5] = adc_temp << 4;
dataDouble->rawTemperatureTouched();
data.raw[3] = dataDouble->raw[3];
data.raw[4] = dataDouble->raw[4];
data.raw[5] = dataDouble->raw[5];
data.rawTemperatureTouched();
double temp;
dataDouble->getTemperature(temp);
XPCC_LOG_DEBUG.printf("adc_temp = %05" PRIx32 ", T = %f\n", adc_temp, temp);
uint32_t adc_press_span = adc_press_max[jj] - adc_press_min[jj];
uint32_t adc_press_step = adc_press_span / 10;
if (adc_press_step == 0) {
adc_press_step = 1;
}
for (uint32_t adc_press = adc_press_min[jj];
adc_press <= adc_press_max[jj];
adc_press += adc_press_step)
{
data.raw[0] = adc_press >> 12;
data.raw[1] = adc_press >> 4;
data.raw[2] = adc_press << 4;
data.rawPressureTouched();
dataDouble->raw[0] = data.raw[0];
dataDouble->raw[1] = data.raw[1];
dataDouble->raw[2] = data.raw[2];
dataDouble->rawPressureTouched();
auto pressFp = data.getPressure() / 1000;
auto pressDp = dataDouble->getPressure();
if ((pressFp < 30000) or (pressDp < 30000) or (pressFp > 110000) or (pressDp > 110000)) {
continue;
}
int32_t error = pressFp - pressDp;
XPCC_LOG_DEBUG.printf(" adc_press = %05" PRIx32 " PressFp = %9" PRId32 " Pa\t PressDp = %9" PRId32 " Pa \t Diff = %5" PRId32 " Pa\n",
adc_press, pressFp, pressDp, error);
error = std::abs(error);
total_error += error;
if (uint32_t(error) > max_error) {
max_error = error;
}
}
}
XPCC_LOG_DEBUG.printf("== Errors ==\n");
XPCC_LOG_DEBUG.printf(" max = %" PRId32 "\n", max_error);
XPCC_LOG_DEBUG.printf(" sum = %" PRId32 "\n", total_error);
TEST_ASSERT_TRUE(total_error <= 2455);
TEST_ASSERT_TRUE(max_error <= 50);
}
}