/* * File : drv_touch.c * This file is part of RT-Thread RTOS * COPYRIGHT (C) 2018 RT-Thread Develop Team * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.rt-thread.org/license/LICENSE * * Change Logs: * Date Author Notes * 2018-10-03 xuzhuoyi first implementation. */ #include "drv_touch.h" #include "drivers/i2c.h" #ifdef PKG_USING_LITTLEVGL2RTT #include "littlevgl2rtt.h" #endif #define TSC_I2C_ADDR 0x41 /* 7-bit I2C address */ static struct rt_i2c_bus_device *stmpe811_i2c_bus; /** \fn int32_t touch_readRegister (uint8_t reg, uint8_t *val) \brief Read register value from Touchscreen controller \param[in] reg Register address \param[out] val Pointer where data will be read from register \returns - \b 0: function succeeded - \b -1: function failed */ static int32_t touch_read (uint8_t reg, uint8_t *val) { struct rt_i2c_msg msgs[2]; msgs[0].addr = TSC_I2C_ADDR; msgs[0].flags = RT_I2C_WR; msgs[0].buf = ® msgs[0].len = 1; msgs[1].addr = TSC_I2C_ADDR; msgs[1].flags = RT_I2C_RD; msgs[1].buf = val; msgs[1].len = 1; if (rt_i2c_transfer(stmpe811_i2c_bus, msgs, 2) == 2) { return RT_EOK; } else { return -RT_ERROR; } } /** \fn int32_t touch_writeData (uint8_t reg, const uint8_t *val) \brief Write value to Touchscreen controller register \param[in] reg Register address \param[in] val Pointer with data to write to register \returns - \b 0: function succeeded - \b -1: function failed */ static int32_t touch_write(uint8_t reg, uint8_t val) { struct rt_i2c_msg msgs; rt_uint8_t buf[2] = {reg, val}; msgs.addr = TSC_I2C_ADDR; msgs.flags = RT_I2C_WR; msgs.buf = buf; msgs.len = 2; if (rt_i2c_transfer(stmpe811_i2c_bus, &msgs, 1) == 1) { return RT_EOK; } else { return -RT_ERROR; } } /** \fn int32_t Touch_Initialize (void) \brief Initialize touchscreen \returns - \b 0: function succeeded - \b -1: function failed */ static rt_err_t stmpe811_touch_init(rt_device_t dev) { stmpe811_i2c_bus = rt_i2c_bus_device_find("touch"); // ptrI2C->Initialize (NULL); // ptrI2C->PowerControl(ARM_POWER_FULL); // ptrI2C->Control (ARM_I2C_BUS_SPEED, ARM_I2C_BUS_SPEED_FAST); // ptrI2C->Control (ARM_I2C_BUS_CLEAR, 0); touch_write(STMPE811_SYS_CTRL1, 0x02); /* Reset Touch-screen controller */ rt_thread_mdelay(10); /* Wait 10ms */ touch_write(STMPE811_SYS_CTRL2, 0x0C); /* Enable TSC and ADC */ touch_write(STMPE811_ADC_CTRL1, 0x68); /* Set sample time , 12-bit mode */ rt_thread_mdelay(1); /* Wait 1ms */ touch_write(STMPE811_ADC_CTRL2, 0x01); /* ADC frequency 3.25 MHz */ touch_write(STMPE811_TSC_CFG, 0xC2); /* Detect delay 10us, Settle time 500us */ touch_write(STMPE811_FIFO_TH, 0x01); /* Threshold for FIFO */ touch_write(STMPE811_FIFO_STA, 0x01); /* FIFO reset */ touch_write(STMPE811_FIFO_STA, 0x00); /* FIFO not reset */ touch_write(STMPE811_TSC_FRACTION_Z, 0x07); /* Fraction z */ touch_write(STMPE811_TSC_I_DRIVE, 0x01); /* Drive 50 mA typical */ touch_write(STMPE811_GPIO_AF, 0x00); /* Pins are used for touchscreen */ touch_write(STMPE811_TSC_CTRL, 0x01); /* Enable TSC */ return 0; } /** \fn int32_t Touch_Uninitialize (void) \brief De-initialize touchscreen \returns - \b 0: function succeeded - \b -1: function failed */ int32_t touch_uninitialize (void) { touch_write(STMPE811_SYS_CTRL1, 0x02); /* Reset Touch-screen controller */ return 0; } /** \fn int32_t Touch_GetState (TOUCH_STATE *pState) \brief Get touchscreen state \param[out] pState pointer to TOUCH_STATE structure \returns - \b 0: function succeeded - \b -1: function failed */ int32_t touch_get_state(struct touch_state *state) { uint8_t val; uint8_t num; uint8_t xyz[4]; int32_t res; struct rt_i2c_msg msgs[2]; /* Read touch status */ res = touch_read(STMPE811_TSC_CTRL, &val); if (res < 0) return -1; state->pressed = (val & (1 << 7)) ? 1 : 0; if (state->pressed) { val = STMPE811_TSC_DATA; /* If FIFO overflow, discard all samples except the last one */ res = touch_read(STMPE811_FIFO_SIZE, &num); if (res < 0 || num == 0) return -1; while (num--) { msgs[0].addr = TSC_I2C_ADDR; msgs[0].flags = RT_I2C_WR; msgs[0].buf = &val; msgs[0].len = 1; //rt_i2c_transfer(stmpe811_i2c_bus, &msgs, 1); //ptrI2C->MasterTransmit (TSC_I2C_ADDR, &val, 1, true); //while (ptrI2C->GetStatus().busy); msgs[1].addr = TSC_I2C_ADDR; msgs[1].flags = RT_I2C_RD; msgs[1].buf = xyz; msgs[1].len = 4; rt_i2c_transfer(stmpe811_i2c_bus, msgs, 2); //ptrI2C->MasterReceive (TSC_I2C_ADDR, xyz, 4, false); //while (ptrI2C->GetStatus().busy); } state->x = (int16_t)((xyz[0] << 4) | ((xyz[1] & 0xF0) >> 4)); state->y = (int16_t) (xyz[2] | ((xyz[1] & 0x0F) << 8)); } else { /* Clear all data in FIFO */ touch_write(STMPE811_FIFO_STA, 0x1); touch_write(STMPE811_FIFO_STA, 0x0); } return 0; } void touch_show_state() { int16_t x; int16_t y; struct touch_state ts; touch_get_state(&ts); x = (3706 - ts.x) / 14; y = (-461 + ts.y) / 10.5; rt_kprintf("[drv_touch] touch_show_state, x: %d, y: %d, pressed: %d, padding: %d\n", ts.x , ts.y, ts.pressed, ts.padding); rt_kprintf("[drv_touch] touch_show_state, phy x: %d, phy y: %d\n", x , y); } MSH_CMD_EXPORT(touch_show_state, show screen coordinate in touching); static int rt_hw_touch_init(void) { static struct rt_device touch; /* init device structure */ touch.type = RT_Device_Class_Unknown; touch.init = stmpe811_touch_init; touch.user_data = RT_NULL; /* register touch device to RT-Thread */ rt_device_register(&touch, "touch", RT_DEVICE_FLAG_RDWR); return RT_EOK; } INIT_BOARD_EXPORT(rt_hw_touch_init);