[bsp][stm32f429-disco] Add touchscreen support
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xuzhuoyi
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/*
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* File : drv_touch.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2018 RT-Thread Develop Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2018-10-03 xuzhuoyi first implementation.
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*/
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#include "drv_touch.h"
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#include "drivers/i2c.h"
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#define TSC_I2C_ADDR 0x41 /* 7-bit I2C address */
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static struct rt_i2c_bus_device *stmpe811_i2c_bus;
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/**
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\fn int32_t touch_readRegister (uint8_t reg, uint8_t *val)
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\brief Read register value from Touchscreen controller
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\param[in] reg Register address
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\param[out] val Pointer where data will be read from register
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\returns
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- \b 0: function succeeded
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- \b -1: function failed
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*/
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static int32_t touch_read (uint8_t reg, uint8_t *val)
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{
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struct rt_i2c_msg msgs[2];
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msgs[0].addr = TSC_I2C_ADDR;
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msgs[0].flags = RT_I2C_WR;
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msgs[0].buf = ®
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msgs[0].len = 1;
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msgs[1].addr = TSC_I2C_ADDR;
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msgs[1].flags = RT_I2C_RD;
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msgs[1].buf = val;
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msgs[1].len = 1;
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if (rt_i2c_transfer(stmpe811_i2c_bus, msgs, 2) == 2)
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{
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return RT_EOK;
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}
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else
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{
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return -RT_ERROR;
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}
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}
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/**
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\fn int32_t touch_writeData (uint8_t reg, const uint8_t *val)
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\brief Write value to Touchscreen controller register
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\param[in] reg Register address
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\param[in] val Pointer with data to write to register
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\returns
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- \b 0: function succeeded
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- \b -1: function failed
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*/
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static int32_t touch_write (uint8_t reg, uint8_t val)
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{
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struct rt_i2c_msg msgs;
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rt_uint8_t buf[2] = {reg, val};
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msgs.addr = TSC_I2C_ADDR;
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msgs.flags = RT_I2C_WR;
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msgs.buf = buf;
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msgs.len = 2;
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if (rt_i2c_transfer(stmpe811_i2c_bus, &msgs, 1) == 1)
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{
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return RT_EOK;
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}
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else
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{
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return -RT_ERROR;
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}
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}
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/**
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\fn int32_t Touch_Initialize (void)
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\brief Initialize touchscreen
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\returns
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- \b 0: function succeeded
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- \b -1: function failed
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*/
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int32_t Touch_Initialize (void)
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{
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stmpe811_i2c_bus = rt_i2c_bus_device_find(STMPE811_I2CBUS_NAME);
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// ptrI2C->Initialize (NULL);
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// ptrI2C->PowerControl(ARM_POWER_FULL);
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// ptrI2C->Control (ARM_I2C_BUS_SPEED, ARM_I2C_BUS_SPEED_FAST);
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// ptrI2C->Control (ARM_I2C_BUS_CLEAR, 0);
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touch_write(STMPE811_SYS_CTRL1, 0x02); /* Reset Touch-screen controller */
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rt_thread_mdelay(10); /* Wait 10ms */
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touch_write(STMPE811_SYS_CTRL2, 0x0C); /* Enable TSC and ADC */
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touch_write(STMPE811_ADC_CTRL1, 0x68); /* Set sample time , 12-bit mode */
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rt_thread_mdelay(1); /* Wait 1ms */
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touch_write(STMPE811_ADC_CTRL2, 0x01); /* ADC frequency 3.25 MHz */
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touch_write(STMPE811_TSC_CFG, 0xC2); /* Detect delay 10us,
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Settle time 500us */
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touch_write(STMPE811_FIFO_TH, 0x01); /* Threshold for FIFO */
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touch_write(STMPE811_FIFO_STA, 0x01); /* FIFO reset */
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touch_write(STMPE811_FIFO_STA, 0x00); /* FIFO not reset */
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touch_write(STMPE811_TSC_FRACTION_Z, 0x07); /* Fraction z */
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touch_write(STMPE811_TSC_I_DRIVE, 0x01); /* Drive 50 mA typical */
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touch_write(STMPE811_GPIO_AF, 0x00); /* Pins are used for touchscreen */
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touch_write(STMPE811_TSC_CTRL, 0x01); /* Enable TSC */
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return 0;
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}
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/**
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\fn int32_t Touch_Uninitialize (void)
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\brief De-initialize touchscreen
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\returns
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- \b 0: function succeeded
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- \b -1: function failed
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*/
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int32_t Touch_Uninitialize (void) {
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touch_write(STMPE811_SYS_CTRL1, 0x02); /* Reset Touch-screen controller */
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return 0;
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}
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/**
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\fn int32_t Touch_GetState (TOUCH_STATE *pState)
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\brief Get touchscreen state
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\param[out] pState pointer to TOUCH_STATE structure
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\returns
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- \b 0: function succeeded
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- \b -1: function failed
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*/
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int32_t Touch_GetState (struct touch_state *pState) {
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uint8_t val;
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uint8_t num;
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uint8_t xyz[4];
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int32_t res;
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uint8_t buf[4];
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struct rt_i2c_msg msgs;
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/* Read touch status */
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res = touch_read(STMPE811_TSC_CTRL, &val);
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if (res < 0) return -1;
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pState->pressed = (val & (1 << 7)) ? 1 : 0;
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if (pState->pressed)
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{
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val = STMPE811_TSC_DATA;
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/* If FIFO overflow, discard all samples except the last one */
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res = touch_read(STMPE811_FIFO_SIZE, &num);
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if (res < 0 || num == 0) return -1;
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while (num--)
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{
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msgs.addr = TSC_I2C_ADDR;
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msgs.flags = RT_I2C_WR;
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msgs.buf = buf;
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msgs.len = 1;
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rt_i2c_transfer(stmpe811_i2c_bus, &msgs, 1);
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//ptrI2C->MasterTransmit (TSC_I2C_ADDR, &val, 1, true);
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//while (ptrI2C->GetStatus().busy);
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msgs.addr = TSC_I2C_ADDR;
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msgs.flags = RT_I2C_RD;
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msgs.buf = buf;
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msgs.len = 4;
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rt_i2c_transfer(stmpe811_i2c_bus, &msgs, 1);
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//ptrI2C->MasterReceive (TSC_I2C_ADDR, xyz, 4, false);
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//while (ptrI2C->GetStatus().busy);
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}
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pState->x = (int16_t)((xyz[0] << 4) | ((xyz[1] & 0xF0) >> 4));
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pState->y = (int16_t) (xyz[2] | ((xyz[1] & 0x0F) << 8));
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}
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else
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{
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/* Clear all data in FIFO */
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touch_write(STMPE811_FIFO_STA, 0x1);
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touch_write(STMPE811_FIFO_STA, 0x0);
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}
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return 0;
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}
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@ -0,0 +1,81 @@
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/*
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* File : drv_touch.h
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2018 RT-Thread Develop Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2018-10-03 xuzhuoyi first implementation.
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*/
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#ifndef __DRV_TOUCH_H__
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#define __DRV_TOUCH_H__
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#include <stdint.h>
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/* Register addresses */
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#define STMPE811_CHIP_ID 0x00
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#define STMPE811_ID_VER 0x02
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#define STMPE811_SYS_CTRL1 0x03
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#define STMPE811_SYS_CTRL2 0x04
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#define STMPE811_SPI_CFG 0x08
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#define STMPE811_INT_CTRL 0x09
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#define STMPE811_INT_EN 0x0A
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#define STMPE811_INT_STA 0x0B
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#define STMPE811_GPIO_EN 0x0C
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#define STMPE811_GPIO_INT_STA 0x0D
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#define STMPE811_ADC_INT_EN 0x0E
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#define STMPE811_ADC_INT_STA 0x0F
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#define STMPE811_GPIO_SET_PIN 0x10
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#define STMPE811_GPIO_CLR_PIN 0x11
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#define STMPE811_GPIO_MP_STA 0x12
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#define STMPE811_GPIO_DIR 0x13
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#define STMPE811_GPIO_ED 0x14
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#define STMPE811_GPIO_RE 0x15
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#define STMPE811_GPIO_FE 0x16
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#define STMPE811_GPIO_AF 0x17
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#define STMPE811_ADC_CTRL1 0x20
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#define STMPE811_ADC_CTRL2 0x21
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#define STMPE811_ADC_CAPT 0x22
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#define STMPE811_ADC_DATA_CH0 0x30
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#define STMPE811_ADC_DATA_CH1 0x32
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#define STMPE811_ADC_DATA_CH2 0x34
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#define STMPE811_ADC_DATA_CH3 0x36
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#define STMPE811_ADC_DATA_CH4 0x38
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#define STMPE811_ADC_DATA_CH5 0x3A
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#define STMPE811_ADC_DATA_CH6 0x3C
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#define STMPE811_ADC_DATA_CH7 0x3E
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#define STMPE811_TSC_CTRL 0x40
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#define STMPE811_TSC_CFG 0x41
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#define STMPE811_WDW_TR_X 0x42
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#define STMPE811_WDW_TR_Y 0x44
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#define STMPE811_WDW_BL_X 0x46
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#define STMPE811_WDW_BL_Y 0x48
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#define STMPE811_FIFO_TH 0x4A
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#define STMPE811_FIFO_STA 0x4B
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#define STMPE811_FIFO_SIZE 0x4C
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#define STMPE811_TSC_DATA_X 0x4D
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#define STMPE811_TSC_DATA_Y 0x4F
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#define STMPE811_TSC_DATA_Z 0x51
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#define STMPE811_TSC_FRACTION_Z 0x56
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#define STMPE811_TSC_DATA_XYZ 0x57
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#define STMPE811_TSC_DATA 0xD7
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#define STMPE811_TSC_I_DRIVE 0x58
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#define STMPE811_TSC_SHIELD 0x59
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#define STMPE811_TEMP_CTRL 0x60
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#define STMPE811_TEMP_DATA 0x61
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#define STMPE811_TEMP_TH 0x62
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/* Touch state */
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struct touch_state {
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int16_t x; ///< Position X
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int16_t y; ///< Position Y
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uint8_t pressed; ///< Pressed flag
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uint8_t padding;
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};
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#endif /* __DRV_TOUCH_H__ */
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