//******************************************************************************
/// \brief Read information block
/// \return #mxt_rc
int mxt_get_info(struct mxt_device *mxt)
{
int ret;
ret = mxt_read_info_block(mxt);
if (ret)
return ret;
ret = mxt_calc_report_ids(mxt);
if (ret) {
mxt_err(mxt->ctx, "Failed to generate report ID look-up table");
return ret;
}
mxt_display_chip_info(mxt);
return MXT_SUCCESS;
}
/**
* \brief Probe for a maXTouch connected to a specific TWI line
*
* \param interface Pointer to TWI register set
* \param *chip_adr I2C address to maXTouch device
* \return Operation result status code
*/
status_code_t mxt_probe_device(twi_master_t interface, uint8_t chip_adr)
{
struct mxt_info_object info;
uint8_t status;
/* Initializing the TWI packet to send to the slave */
twi_package_t packet = {
.addr[0] = MXT_MEM_ADDR,
.addr[1] = MXT_MEM_ADDR >> 8,
.addr_length = sizeof(mxt_memory_adr),
.chip = chip_adr,
.buffer = &info,
.length = sizeof(info)
};
/* Read information from the slave */
status = twi_master_read(interface, &packet);
if (status != TWI_SUCCESS) {
return (status_code_t)status;
}
if ((info.family_ID != MXT_FAMILY_143E)
|| (info.variant_ID != MXT_VARIANT_143E)) {
return ERR_BAD_ADDRESS;
}
return STATUS_OK;
}
/**
* \brief Initialize maXTouch device connected to TWIx module
*
* \param *interface Pointer to TWI register set
* \param *device Pointer to mxt_device instance
* \param chip_adr I2C address to maXTouch device
* \param chgpin IOPORT pin instance attached to the maXTouch device's /CHG pin
* \return Operation result status code
*/
status_code_t mxt_init_device(struct mxt_device *device,
twi_master_t interface, uint8_t chip_adr, uint32_t chgpin)
{
int8_t status;
/* Set TWI interface, TWI address and CHG-pin of the maXTouch device. */
device->interface = interface;
device->mxt_chip_adr = chip_adr;
device->chgpin = chgpin;
device->handler = NULL;
/* Read the info block from the chip into the mxt_device struct */
status = mxt_read_info_block(device);
if (status != STATUS_OK) {
return (status_code_t)status;
}
/* Validate the data read from the info block */
status = mxt_validate_info_block(device);
if (status != STATUS_OK) {
return (status_code_t)status;
}
/* Fix possible endian issues between protocol and cpu */
mxt_info_le_to_cpu(device);
/* Create map of the report ID's and put it into mxt_device struct */
status = mxt_create_report_id_map(device);
if (status != STATUS_OK) {
return (status_code_t)status;
}
/* Get the report id offset of the multi touch object*/
status = mxt_get_report_id_offset(device,
MXT_TOUCH_MULTITOUCHSCREEN_T9);
if (status == -1) {
return ERR_BAD_DATA;
}
device->multitouch_report_offset = status;
return STATUS_OK;
}
