111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
#include "Cst816s.h"
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#include <FreeRTOS.h>
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#include <legacy/nrf_drv_gpiote.h>
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#include <nrfx_log.h>
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#include <task.h>
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#include "drivers/PinMap.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 :
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* https://medium.com/@ly.lee/building-a-rust-driver-for-pinetimes-touch-controller-cbc1a5d5d3e9 Touch panel datasheet (weird chinese
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* 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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Cst816S::Cst816S(TwiMaster& twiMaster, uint8_t twiAddress) : twiMaster {twiMaster}, twiAddress {twiAddress} {
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}
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bool Cst816S::Init() {
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nrf_gpio_cfg_output(PinMap::Cst816sReset);
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nrf_gpio_pin_clear(PinMap::Cst816sReset);
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vTaskDelay(5);
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nrf_gpio_pin_set(PinMap::Cst816sReset);
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vTaskDelay(50);
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// Wake the touchpanel up
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uint8_t dummy;
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twiMaster.Read(twiAddress, 0x15, &dummy, 1);
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vTaskDelay(5);
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twiMaster.Read(twiAddress, 0xa7, &dummy, 1);
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vTaskDelay(5);
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/*
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[2] EnConLR - Continuous operation can slide around
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[1] EnConUD - Slide up and down to enable continuous operation
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[0] EnDClick - Enable Double-click action
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*/
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static constexpr uint8_t motionMask = 0b00000101;
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twiMaster.Write(twiAddress, 0xEC, &motionMask, 1);
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/*
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[7] EnTest - Interrupt pin to test, enable automatic periodic issued after a low pulse.
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[6] EnTouch - When a touch is detected, a periodic pulsed Low.
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[5] EnChange - Upon detecting a touch state changes, pulsed Low.
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[4] EnMotion - When the detected gesture is pulsed Low.
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[0] OnceWLP - Press gesture only issue a pulse signal is low.
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*/
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static constexpr uint8_t irqCtl = 0b01110000;
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twiMaster.Write(twiAddress, 0xFA, &irqCtl, 1);
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// There's mixed information about which register contains which information
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if (twiMaster.Read(twiAddress, 0xA7, &chipId, 1) == TwiMaster::ErrorCodes::TransactionFailed) {
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chipId = 0xFF;
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return false;
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}
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if (twiMaster.Read(twiAddress, 0xA8, &vendorId, 1) == TwiMaster::ErrorCodes::TransactionFailed) {
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vendorId = 0xFF;
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return false;
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}
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if (twiMaster.Read(twiAddress, 0xA9, &fwVersion, 1) == TwiMaster::ErrorCodes::TransactionFailed) {
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fwVersion = 0xFF;
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return false;
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}
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return chipId == 0xb4 && vendorId == 0 && fwVersion == 1;
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}
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Cst816S::TouchInfos Cst816S::GetTouchInfo() {
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Cst816S::TouchInfos info;
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uint8_t touchData[7];
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auto ret = twiMaster.Read(twiAddress, 0, touchData, sizeof(touchData));
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if (ret != TwiMaster::ErrorCodes::NoError) {
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info.isValid = false;
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return info;
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}
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// This can only be 0 or 1
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uint8_t nbTouchPoints = touchData[touchPointNumIndex] & 0x0f;
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uint8_t xHigh = touchData[touchXHighIndex] & 0x0f;
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uint8_t xLow = touchData[touchXLowIndex];
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info.x = (xHigh << 8) | xLow;
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uint8_t yHigh = touchData[touchYHighIndex] & 0x0f;
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uint8_t yLow = touchData[touchYLowIndex];
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info.y = (yHigh << 8) | yLow;
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info.touching = (nbTouchPoints > 0);
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info.gesture = static_cast<Gestures>(touchData[gestureIndex]);
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return info;
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}
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void Cst816S::Sleep() {
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nrf_gpio_pin_clear(PinMap::Cst816sReset);
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vTaskDelay(5);
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nrf_gpio_pin_set(PinMap::Cst816sReset);
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vTaskDelay(50);
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static constexpr uint8_t sleepValue = 0x03;
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twiMaster.Write(twiAddress, 0xA5, &sleepValue, 1);
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NRF_LOG_INFO("[TOUCHPANEL] Sleep");
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}
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void Cst816S::Wakeup() {
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Init();
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NRF_LOG_INFO("[TOUCHPANEL] Wakeup");
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}
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