78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
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#include <FreeRTOS.h>
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#include <task.h>
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#include <nrfx_log.h>
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#include <legacy/nrf_drv_gpiote.h>
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#include "Cst816s.h"
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using namespace Pinetime::Drivers;
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/* References :
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* This implementation is based on this article : https://medium.com/@ly.lee/building-a-rust-driver-for-pinetimes-touch-controller-cbc1a5d5d3e9
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* 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
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*
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* TODO : we need a complete datasheet and protocol reference!
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* */
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void Pinetime::Drivers::Cst816S::Init() {
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nrf_gpio_cfg_output(pinReset);
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nrf_gpio_pin_clear(pinReset);
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vTaskDelay(20);
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nrf_gpio_pin_set(pinReset);
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vTaskDelay(200);
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nrfx_twi_config_t config;
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config.frequency = NRF_TWI_FREQ_400K;
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config.scl = 7;
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config.sda = 6;
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config.interrupt_priority = NRFX_TWI_DEFAULT_CONFIG_IRQ_PRIORITY;
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config.hold_bus_uninit = NRFX_TWI_DEFAULT_CONFIG_HOLD_BUS_UNINIT;
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// Configure TWI in blocking mode (event_handler = nullptr)
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auto ret = nrfx_twi_init(&twi, &config, nullptr, this);
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nrfx_twi_enable(&twi);
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}
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void Cst816S::Probe() {
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nrfx_err_t ret;
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for(int i = 0; i < 127; i++) {
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uint8_t data;
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ret = nrfx_twi_rx(&twi, i, &data, 1);
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if(ret == NRFX_SUCCESS) {
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NRF_LOG_INFO("I2C device detected at address %d", i);
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}
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}
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}
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Cst816S::TouchInfos Cst816S::GetTouchInfo() {
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Cst816S::TouchInfos info;
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nrfx_twi_rx(&twi, address, touchData, 63);
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auto nbTouchPoints = touchData[2] & 0x0f;
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uint8_t i = 0;
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uint8_t pointId = (touchData[touchIdIndex + (touchStep * i)]) >> 4;
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if(nbTouchPoints == 0 && pointId == lastTouchId) return info;
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// We fetch only the first touch point (the controller seems to handle only one anyway...)
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info.isTouch = true;
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auto xHigh = touchData[touchXHighIndex + (touchStep * i)] & 0x0f;
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auto xLow = touchData[touchXLowIndex + (touchStep * i)];
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uint16_t x = (xHigh << 8) | xLow;
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auto yHigh = touchData[touchYHighIndex + (touchStep * i)] & 0x0f;
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auto yLow = touchData[touchYLowIndex + (touchStep * i)];
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uint16_t y = (yHigh << 8) | yLow;
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auto action = touchData[touchEventIndex + (touchStep * i)] >> 6; /* 0 = Down, 1 = Up, 2 = contact*/
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auto finger = touchData[touchIdIndex + (touchStep * i)] >> 4;
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auto pressure = touchData[touchXYIndex + (touchStep * i)];
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auto area = touchData[touchMiscIndex + (touchStep * i)] >> 4;
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info.x = x;
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info.y = y;
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info.action = action;
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return info;
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}
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