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update lookup table example

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This commit is contained in:
Amar Mahmutbegovic
2024-09-23 00:17:56 +02:00
parent 6090eba6d3
commit 87087b3bfb
11 changed files with 301 additions and 72 deletions
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132
Chapter11/compile_time/app/src/main_lookup_table.cpp
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@@ -4,69 +4,31 @@
#include <stm32f072xb.h>
#include <hal.hpp>
#include <units.hpp>
#include <uart_stm32.hpp>
#include <adc_stm32.hpp>
#include <retarget.hpp>
#include <signal.hpp>
#include <algorithm>
#include <array>
#include <gpio_stm32.hpp>
ADC_HandleTypeDef hadc;
static void MX_ADC_Init(void)
{
/* USER CODE BEGIN ADC_Init 0 */
/* USER CODE END ADC_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC_Init 1 */
/* USER CODE END ADC_Init 1 */
/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc.Instance = ADC1;
hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc.Init.LowPowerAutoWait = DISABLE;
hadc.Init.LowPowerAutoPowerOff = DISABLE;
hadc.Init.ContinuousConvMode = DISABLE;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.DMAContinuousRequests = DISABLE;
hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
if (HAL_ADC_Init(&hadc) != HAL_OK)
{
//Error_Handler();
}
/** Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
//Error_Handler();
}
/* USER CODE BEGIN ADC_Init 2 */
/* USER CODE END ADC_Init 2 */
}
namespace {
struct voltage_divider {
units::resistance r2;
units::voltage vcc;
units::resistance get_r1(units::voltage vadc) {
return r2 * (vcc/vadc - 1);
}
};
};
int main()
{
using namespace units;
hal::init();
hal::uart_stm32 uart(USART2);
@@ -74,28 +36,58 @@ int main()
retarget::set_stdio_uart(&uart);
MX_ADC_Init();
hal::adc_stm32 adc(3.3_V);
adc.init();
constexpr float A = 1.18090254918130e-3;
constexpr float B = 2.16884014794388e-4;
constexpr float C = 1.90058756197216e-6;
constexpr float D = 1.83161892641824e-8;
constexpr int c_lut_points = 50;
constexpr signal<float, c_lut_points> resistance(1e3, 10e3);
constexpr auto temperature_k = 1 / (A +
B * signal(resistance, [](float x)
{ return std::log(x); }) +
C * signal(resistance, [](float x)
{ return std::pow(std::log(x), 2); }) +
D * signal(resistance, [](float x)
{ return std::pow(std::log(x), 3); }));
constexpr auto temperature_celsius = temperature_k - 273.15;
voltage_divider divider{10e3_Ohm, 3.3_V};
const hal::gpio_stm32<hal::port_a> button1(hal::pin::p4, [](){
printf("Button1 pressed!\r\n");
});
const hal::gpio_stm32<hal::port_a> button2(hal::pin::p5, [](){
printf("Button2 pressed!\r\n");
});
while(true)
{
HAL_ADC_Start(&hadc);
HAL_ADC_PollForConversion(&hadc, 1000);
auto adc_val = adc.get_reading();
if(adc_val) {
auto adc_val_voltage = *adc_val;
auto thermistor_r = divider.get_r1(adc_val_voltage);
auto adc_val = HAL_ADC_GetValue(&hadc);
float mv = 3.3f * static_cast<float>(adc_val) / 4096.f;
printf("%d, %.2f\r\n", adc_val, mv);
hal::time::delay_ms(1000);
auto it = std::lower_bound(resistance.begin(), resistance.end(), thermistor_r.get());
if(it != resistance.end()) {
std::size_t pos = std::distance(resistance.begin(), it);
float temperature = temperature_celsius.at(pos);
printf("%d mV, %d Ohm, %d.%d C\r\n", static_cast<int>(adc_val_voltage.get_mili()),
static_cast<int>(thermistor_r.get()),
static_cast<int>(temperature),
static_cast<int>(10*(temperature-std::floor(temperature)))
);
}
}
hal::time::delay_ms(200);
}
}
// adc FeedVoltageSampleToChannel 0 3100 10
// adc FeedVoltageSampleToChannel 0 3000 3 -> 1001 Ohm
// adc FeedVoltageSampleToChannel 0 2800 3 -> 1787 Ohm
// adc FeedVoltageSampleToChannel 0 2400 3 -> 3754 Ohm
// adc FeedVoltageSampleToChannel 0 2200 3 -> 5003 Ohm
// adc FeedVoltageSampleToChannel 0 2000 3 -> 6502 Ohm
// adc FeedVoltageSampleToChannel 0 1700 3 -> 9412 Ohm