stmpe811_state_t stmpe811_init(void)
{
stmpe811_i2c_init();
msleep(50);
stmpe811_reset();
/* start of the documented initialization sequence */
stmpe811_disable_ts();
stmpe811_disable_gpio();
stmpe811_enable_fifo_of();
stmpe811_enable_fifo_th();
stmpe811_enable_fifo_touch_det();
stmpe811_set_adc_sample(0x40); /* set to 80 cycles */
stmpe811_set_adc_resolution(0x08); /* set adc resolution to 12 bit */
stmpe811_set_adc_freq(0x01); /* set adc clock speed to 3.25 MHz */
stmpe811_set_gpio_af(0x00); /* set GPIO AF to function as ts/adc */
/*
* tsc cfg set to avg control = 4 samples
* touch detection delay = 500 microseconds
* panel driver settling time = 500 microcseconds
*/
stmpe811_set_tsc(0x9A);
stmpe811_set_fifo_th(0x01); /* set fifo threshold */
stmpe811_reset_fifo(); /* reset fifo */
/* set fractional part to 7, whole part to 1 */
stmpe811_set_tsc_fraction_z(0x07);
/* set current limit value to 50 mA */
stmpe811_set_tsc_i_drive(0x01);
stmpe811_enable_tsc(); /* enable tsc (touchscreen clock) */
stmpe811_set_int_sta(0xFF); /* clear interrupt status */
stmpe811_enable_interrupts();
/* end of the documented initialization sequence */
msleep(2);
return stmpe811_state_ok;
}
STMPE811_HANDLE stmpe811_instantiate(FAR struct i2c_dev_s *dev,
FAR struct stmpe811_config_s *config)
#endif
{
FAR struct stmpe811_dev_s *priv;
uint8_t regval;
int ret;
/* Allocate the device state structure */
#ifdef CONFIG_STMPE811_MULTIPLE
priv = (FAR struct stmpe811_dev_s *)kmm_zalloc(sizeof(struct stmpe811_dev_s));
if (!priv)
{
return NULL;
}
/* And save the device structure in the list of STMPE811 so that we can find it later */
priv->flink = g_stmpe811list;
g_stmpe811list = priv;
#else
/* Use the one-and-only STMPE811 driver instance */
priv = &g_stmpe811;
#endif
/* Initialize the device state structure */
sem_init(&priv->exclsem, 0, 1);
priv->config = config;
#ifdef CONFIG_STMPE811_SPI
priv->spi = dev;
#else
priv->i2c = dev;
/* Set the I2C address and frequency. REVISIT: This logic would be
* insufficient if we share the I2C bus with any other devices that also
* modify the address and frequency.
*/
I2C_SETADDRESS(dev, config->address, 7);
I2C_SETFREQUENCY(dev, config->frequency);
#endif
/* Read and verify the STMPE811 chip ID */
ret = stmpe811_checkid(priv);
if (ret < 0)
{
#ifdef CONFIG_STMPE811_MULTIPLE
g_stmpe811list = priv->flink;
kmm_free(priv);
#endif
return NULL;
}
/* Generate STMPE811 Software reset */
stmpe811_reset(priv);
/* Configure the interrupt output pin to generate interrupts on high or low level. */
regval = stmpe811_getreg8(priv, STMPE811_INT_CTRL);
#ifdef CONFIG_STMPE811_ACTIVELOW
regval &= ~INT_CTRL_INT_POLARITY; /* Pin polarity: Active low / falling edge */
#else
regval |= INT_CTRL_INT_POLARITY; /* Pin polarity: Active high / rising edge */
#endif
#ifdef CONFIG_STMPE811_EDGE
regval |= INT_CTRL_INT_TYPE; /* Edge interrupt */
#else
regval &= ~INT_CTRL_INT_TYPE; /* Level interrupt */
#endif
stmpe811_putreg8(priv, STMPE811_INT_CTRL, regval);
/* Attach the STMPE811 interrupt handler. */
config->attach(config, stmpe811_interrupt);
/* Clear any pending interrupts */
stmpe811_putreg8(priv, STMPE811_INT_STA, INT_ALL);
config->clear(config);
config->enable(config, true);
/* Enable global interrupts */
regval = stmpe811_getreg8(priv, STMPE811_INT_CTRL);
regval |= INT_CTRL_GLOBAL_INT;
stmpe811_putreg8(priv, STMPE811_INT_CTRL, regval);
/* Return our private data structure as an opaque handle */
return (STMPE811_HANDLE)priv;
}
