You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
2.1 KiB
93 lines
2.1 KiB
2 years ago
|
#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
|