Add basic touch panel driver.
Handle touch event in display app : draw a big square at the touch point coordinates.main
parent
27d0e1e02f
commit
ee530baaa0
@ -0,0 +1,77 @@
|
||||
#include <FreeRTOS.h>
|
||||
#include <task.h>
|
||||
#include <nrfx_log.h>
|
||||
#include <legacy/nrf_drv_gpiote.h>
|
||||
|
||||
#include "Cst816s.h"
|
||||
using namespace Pinetime::Drivers;
|
||||
|
||||
/* References :
|
||||
* This implementation is based on this article : https://medium.com/@ly.lee/building-a-rust-driver-for-pinetimes-touch-controller-cbc1a5d5d3e9
|
||||
* Touch panel datasheet (weird chinese translation) : https://wiki.pine64.org/images/5/51/CST816S%E6%95%B0%E6%8D%AE%E6%89%8B%E5%86%8CV1.1.en.pdf
|
||||
*
|
||||
* TODO : we need a complete datasheet and protocol reference!
|
||||
* */
|
||||
|
||||
void Pinetime::Drivers::Cst816S::Init() {
|
||||
nrf_gpio_cfg_output(pinReset);
|
||||
nrf_gpio_pin_clear(pinReset);
|
||||
vTaskDelay(20);
|
||||
nrf_gpio_pin_set(pinReset);
|
||||
vTaskDelay(200);
|
||||
|
||||
nrfx_twi_config_t config;
|
||||
config.frequency = NRF_TWI_FREQ_400K;
|
||||
config.scl = 7;
|
||||
config.sda = 6;
|
||||
config.interrupt_priority = NRFX_TWI_DEFAULT_CONFIG_IRQ_PRIORITY;
|
||||
config.hold_bus_uninit = NRFX_TWI_DEFAULT_CONFIG_HOLD_BUS_UNINIT;
|
||||
|
||||
// Configure TWI in blocking mode (event_handler = nullptr)
|
||||
auto ret = nrfx_twi_init(&twi, &config, nullptr, this);
|
||||
nrfx_twi_enable(&twi);
|
||||
}
|
||||
|
||||
|
||||
void Cst816S::Probe() {
|
||||
nrfx_err_t ret;
|
||||
for(int i = 0; i < 127; i++) {
|
||||
uint8_t data;
|
||||
ret = nrfx_twi_rx(&twi, i, &data, 1);
|
||||
if(ret == NRFX_SUCCESS) {
|
||||
NRF_LOG_INFO("I2C device detected at address %d", i);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Cst816S::TouchInfos Cst816S::GetTouchInfo() {
|
||||
Cst816S::TouchInfos info;
|
||||
|
||||
nrfx_twi_rx(&twi, address, touchData, 63);
|
||||
auto nbTouchPoints = touchData[2] & 0x0f;
|
||||
|
||||
uint8_t i = 0;
|
||||
uint8_t pointId = (touchData[touchIdIndex + (touchStep * i)]) >> 4;
|
||||
if(nbTouchPoints == 0 && pointId == lastTouchId) return info;
|
||||
|
||||
// We fetch only the first touch point (the controller seems to handle only one anyway...)
|
||||
info.isTouch = true;
|
||||
|
||||
auto xHigh = touchData[touchXHighIndex + (touchStep * i)] & 0x0f;
|
||||
auto xLow = touchData[touchXLowIndex + (touchStep * i)];
|
||||
uint16_t x = (xHigh << 8) | xLow;
|
||||
|
||||
auto yHigh = touchData[touchYHighIndex + (touchStep * i)] & 0x0f;
|
||||
auto yLow = touchData[touchYLowIndex + (touchStep * i)];
|
||||
uint16_t y = (yHigh << 8) | yLow;
|
||||
|
||||
auto action = touchData[touchEventIndex + (touchStep * i)] >> 6; /* 0 = Down, 1 = Up, 2 = contact*/
|
||||
auto finger = touchData[touchIdIndex + (touchStep * i)] >> 4;
|
||||
auto pressure = touchData[touchXYIndex + (touchStep * i)];
|
||||
auto area = touchData[touchMiscIndex + (touchStep * i)] >> 4;
|
||||
|
||||
info.x = x;
|
||||
info.y = y;
|
||||
info.action = action;
|
||||
return info;
|
||||
}
|
@ -0,0 +1,47 @@
|
||||
#pragma once
|
||||
|
||||
#include <nrfx_twi.h>
|
||||
|
||||
namespace Pinetime {
|
||||
namespace Drivers {
|
||||
class Cst816S {
|
||||
public :
|
||||
struct TouchInfos {
|
||||
uint16_t x;
|
||||
uint16_t y;
|
||||
uint8_t action;
|
||||
uint8_t finger;
|
||||
uint8_t pressure;
|
||||
uint8_t area;
|
||||
bool isTouch = false;
|
||||
};
|
||||
|
||||
void Init();
|
||||
void Probe();
|
||||
TouchInfos GetTouchInfo();
|
||||
private:
|
||||
static constexpr uint8_t pinIrq = 28;
|
||||
static constexpr uint8_t pinReset = 10;
|
||||
static constexpr uint8_t address = 0x15;
|
||||
static constexpr uint8_t lastTouchId = 0x0f;
|
||||
static constexpr uint8_t touchPointNumIndex = 2;
|
||||
static constexpr uint8_t touchMiscIndex = 8;
|
||||
static constexpr uint8_t touchXYIndex = 7;
|
||||
static constexpr uint8_t touchEventIndex = 3;
|
||||
static constexpr uint8_t touchXHighIndex = 3;
|
||||
static constexpr uint8_t touchXLowIndex = 4;
|
||||
static constexpr uint8_t touchYHighIndex = 5;
|
||||
static constexpr uint8_t touchYLowIndex = 6;
|
||||
static constexpr uint8_t touchIdIndex = 5;
|
||||
static constexpr uint8_t touchStep = 6;
|
||||
|
||||
uint8_t touchData[63];
|
||||
|
||||
// TODO TWI (i²C) should be created outside and injected into this class
|
||||
// It will be needed when implementing other I²C devices
|
||||
// (0x15 = touch, 0x18 = accelerometer, 0x44 = HR sensor)
|
||||
nrfx_twi_t twi = NRFX_TWI_INSTANCE(1); // Use instance 1, because instance 0 is already used by SPI
|
||||
};
|
||||
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue