STMPE610 touch sensor driver library
Dependents: TS_Eyes Tokei testUniGraphic_150217 AfficheurTFTAdafruit ... more
Diff: SPI_STMPE610.cpp
- Revision:
- 0:68779c92cffa
- Child:
- 1:43990f1c0a8b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SPI_STMPE610.cpp Sat Nov 08 05:17:25 2014 +0000 @@ -0,0 +1,228 @@ +/* mbed SPI_STMPE610.cpp to test adafruit 2.8" TFT LCD shiled w Touchscreen + * Copyright (c) 2014 Motoo Tanaka @ Design Methodology Lab + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + /* + * Note: Since the interrupt siganl of the shield was not connected + * to an interrupt pin on my frdm-kl25z, I just used polling mode. + */ + /* + * Note: To make this work with FRDM-K64F + * PTA0 must be disconnected from the swd clk by cutting J11. + * But to re-active SWD you need to put jumper header to J11 + * so that it can be re-connected by a jumper. + */ +#include "SPI_STMPE610.h" + +/* some definitions here */ +#define REG_CHIP_ID 0x00 +#define REG_CHIP_ID_MSB 0x00 +#define REG_CHIP_ID_LSB 0x01 + +#define REG_ID_VER 0x02 +#define REG_SYS_CTRL1 0x03 +#define REG_SYS_CTRL1_RESET 0x02 + +#define REG_SYS_CTRL2 0x04 +#define REG_SPI_CFG 0x08 +#define REG_INT_CTRL 0x09 +#define REG_INT_CTRL_POL_HIGH 0x04 +#define REG_INT_CTRL_POL_LOW 0x00 +#define REG_INT_CTRL_EDGE 0x02 +#define REG_INT_CTRL_LEVEL 0x00 +#define REG_INT_CTRL_ENABLE 0x01 +#define REG_INT_CTRL_DISABLE 0x00 + +#define REG_INT_EN 0x0A +#define REG_INT_EN_TOUCHDET 0x01 +#define REG_INT_EN_FIFOTH 0x02 +#define REG_INT_EN_FIFOOF 0x04 +#define REG_INT_EN_FIFOFULL 0x08 +#define REG_INT_EN_FIFOEMPTY 0x10 +#define REG_INT_EN_ADC 0x40 + +#define REG_INT_STA 0x0B +#define REG_INT_STA_TOUCHDET 0x01 + +#define REG_GPIO_EN 0x0C +#define REG_GPIO_INT_STA 0x0D +#define REG_ADC_INT_EN 0x0E +#define REG_ADC_INT_STA 0x0F +#define REG_GPIO_SET_PIN 0x10 +#define REG_GPIO_CLR_PIN 0x11 +#define REG_GPIO_MP_STA 0x12 +#define REG_GPIO_DIR 0x13 +#define REG_GPIO_ED 0x14 +#define REG_GPIO_RE 0x15 +#define REG_GPIO_FE 0x16 +#define REG_GPIO_AF 0x17 +#define REG_ADC_CTRL1 0x20 +#define REG_ADC_CTRL1_12BIT 0x08 +#define REG_ADC_CTRL1_10BIT 0x00 + +#define REG_ADC_CTRL2 0x21 +#define REG_ADC_CTRL2_1_625MHZ 0x00 +#define REG_ADC_CTRL2_3_25MHZ 0x01 +#define REG_ADC_CTRL2_6_5MHZ 0x02 + +#define REG_ADC_CAPT 0x22 +#define REG_ADC_DATA_CH0 0x30 +#define REG_ADC_DATA_CH1 0x32 +#define REG_ADC_DATA_CH4 0x38 +#define REG_ADC_DATA_CH5 0x3A +#define REG_ADC_DATA_CH6 0x3C +#define REG_ADC_DATA_CH7 0x3E +#define REG_TSC_CTRL 0x40 +#define REG_TSC_CTRL_EN 0x01 +#define REG_TSC_CTRL_XYZ 0x00 +#define REG_TSC_CTRL_XY 0x02 + +#define REG_TSC_CFG 0x41 +#define REG_TSC_CFG_1SAMPLE 0x00 +#define REG_TSC_CFG_2SAMPLE 0x40 +#define REG_TSC_CFG_4SAMPLE 0x80 +#define REG_TSC_CFG_8SAMPLE 0xC0 +#define REG_TSC_CFG_DELAY_10US 0x00 +#define REG_TSC_CFG_DELAY_50US 0x08 +#define REG_TSC_CFG_DELAY_100US 0x10 +#define REG_TSC_CFG_DELAY_500US 0x18 +#define REG_TSC_CFG_DELAY_1MS 0x20 +#define REG_TSC_CFG_DELAY_5MS 0x28 +#define REG_TSC_CFG_DELAY_10MS 0x30 +#define REG_TSC_CFG_DELAY_50MS 0x38 +#define REG_TSC_CFG_SETTLE_10US 0x00 +#define REG_TSC_CFG_SETTLE_100US 0x01 +#define REG_TSC_CFG_SETTLE_500US 0x02 +#define REG_TSC_CFG_SETTLE_1MS 0x03 +#define REG_TSC_CFG_SETTLE_5MS 0x04 +#define REG_TSC_CFG_SETTLE_10MS 0x05 +#define REG_TSC_CFG_SETTLE_50MS 0x06 +#define REG_TSC_CFG_SETTLE_100MS 0x07 + +#define REG_WDW_TR_X 0x42 +#define REG_WDW_TR_Y 0x44 +#define REG_WDW_BL_X 0x46 +#define REG_WDW_BL_Y 0x48 +#define REG_FIFO_TH 0x4A +#define REG_FIFO_STA 0x4B +#define REG_FIFO_SIZE 0x4C +#define REG_TSC_DATA_X 0x4D +#define REG_TSC_DATA_Y 0x4F +#define REG_TSC_DATA_Z 0x51 +#define REG_TSC_DATA_XYZ 0x52 +#define REG_TSC_FRACT_XYZ 0x56 +#define REG_TSC_DATA 0x57 +#define REG_TSC_I_DRIVE 0x58 +#define REG_TSC_SHIELD 0x59 + +SPI_STMPE610::SPI_STMPE610(PinName mosi, PinName miso, PinName sclk, PinName cs) : + m_spi(mosi, miso, sclk), m_cs(cs) { + // activate the peripheral + m_cs = 0 ; + _mode = 0 ; + m_spi.frequency(1000000) ; + m_spi.format(8, 0) ; + write8(REG_SYS_CTRL1, REG_SYS_CTRL1_RESET) ; + wait(0.1) ; + write8(REG_SYS_CTRL2, 0x00) ; // turn on clocks + write8(REG_TSC_CFG, + REG_TSC_CFG_4SAMPLE + | REG_TSC_CFG_DELAY_100US + | REG_TSC_CFG_SETTLE_1MS ) ; + + write8(REG_TSC_CTRL, REG_TSC_CTRL_XYZ | REG_TSC_CTRL_EN) ; + m_cs = 1 ; +} + +SPI_STMPE610::~SPI_STMPE610() { } + +void SPI_STMPE610::readRegs(int addr, uint8_t * data, int len) { + m_cs = 0 ; + + for (int i = 0 ; i < len ; i++ ) { + m_spi.write((addr+i)|0x80) ; // spacify address to read + data[i] = m_spi.write((addr+i)|0x80) ; + } + m_spi.write(0x00) ; // to terminate read mode + m_cs = 1 ; +} + +void SPI_STMPE610::writeRegs(uint8_t * data, int len) { + m_cs = 0 ; + for (int i = 0 ; i < len ; i++ ) { + m_spi.write(data[i]) ; + } + m_cs = 1 ; +} + +void SPI_STMPE610::write8(int addr, uint8_t data8) +{ + uint8_t data[2] ; + data[0] = addr ; + data[1] = data8 ; + writeRegs(data, 2) ; +} + +uint8_t SPI_STMPE610::read8(int addr) +{ + uint8_t data[1] ; + readRegs(addr, data, 1) ; + return( data[0] ) ; +} + +void SPI_STMPE610::write16(int addr, uint16_t data16) +{ + uint8_t data[3] ; + data[0] = addr ; + data[1] = (data16 >> 8) & 0xFF ; + data[2] = data16 & 0xFF ; + writeRegs(data, 3) ; +} + +uint16_t SPI_STMPE610::read16(int addr) +{ + uint8_t data[2] ; + uint16_t value = 0 ; + readRegs(addr, data, 2) ; + value = (data[0] << 8) | data[1] ; + return( value ) ; +} + +int SPI_STMPE610::getRAWPoint(uint16_t *x, uint16_t *y, uint16_t *z) +{ + uint8_t data[8], touched = 0 ; + data[0] = REG_TSC_CTRL ; + data[1] = REG_TSC_CTRL_EN ; + writeRegs(data, 2) ; + wait(0.01) ; + + readRegs(REG_TSC_CTRL, data, 1) ; + touched = data[0] & 0x80 ; + if (touched) { //Touch Detected + readRegs(REG_TSC_DATA_X, data,5) ; + *x = (data[0] << 8) | data[1] ; + *y = (data[2] << 8) | data[3] ; + *z = data[4] ; + } else { + *x = 0 ; + *y = 0 ; + *z = 0 ; + } + + data[0] = 0x4B ; + data[1] = 0x01 ; + writeRegs(data, 2) ; // clear FIFO + + data[0] = REG_TSC_CTRL ; + data[1] = 0x00 ; // disable TSC + writeRegs(data, 2) ; + + return( touched & (*x || *y || *z)) ; +}