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#include "touchwheel.hpp"
#include <cstdint>
#include "assert.h"
#include "driver/i2c.h"
#include "esp_err.h"
#include "esp_log.h"
#include "hal/i2c_types.h"
#include "i2c.hpp"
namespace drivers {
static const char* kTag = "TOUCHWHEEL";
static const uint8_t kTouchWheelAddress = 0x1C;
static const uint8_t kWriteMask = 0x80;
static const uint8_t kReadMask = 0xA0;
double normalise(uint16_t min, uint16_t max, uint16_t value) {
if (value >= max) {
return 1.0;
}
if (value <= min) {
return 0.0;
}
uint16_t range = max - min;
return (double)(value - min) / range;
}
auto TouchWheel::create(GpioExpander* expander)
-> cpp::result<std::unique_ptr<TouchWheel>, Error> {
std::unique_ptr<TouchWheel> wheel = std::make_unique<TouchWheel>(expander);
wheel->WriteRegister(Register::SLIDER_OPTIONS, 0xC0);
return wheel;
}
TouchWheel::TouchWheel(GpioExpander* gpio) {
this->gpio_ = gpio;
};
TouchWheel::~TouchWheel(){
};
void TouchWheel::WriteRegister(uint8_t reg, uint8_t val) {
// uint8_t maskedReg = reg | kWriteMask;
uint8_t maskedReg = reg;
I2CTransaction transaction;
transaction.start()
.write_addr(kTouchWheelAddress, I2C_MASTER_WRITE)
.write_ack(maskedReg, val)
.stop();
ESP_ERROR_CHECK(transaction.Execute());
}
void TouchWheel::ReadRegister(uint8_t reg, uint8_t* data, uint8_t count) {
// uint8_t maskedReg = reg | kReadMask;
uint8_t maskedReg = reg;
if (count <= 0) {
return;
}
I2CTransaction transaction;
transaction.start()
.write_addr(kTouchWheelAddress, I2C_MASTER_WRITE)
.write_ack(maskedReg)
.stop()
.start()
.write_addr(kTouchWheelAddress, I2C_MASTER_READ)
.read(data, I2C_MASTER_NACK)
.stop();
// TODO: Handle errors here.
ESP_ERROR_CHECK(transaction.Execute());
}
void TouchWheel::Update() {
// Read data from device into member struct
uint8_t position;
this->ReadRegister(Register::SLIDER_POSITION, &position, 1);
data_.wheel_position = position;
}
TouchWheelData TouchWheel::GetTouchWheelData() const {
return data_;
}
} // namespace drivers
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