/**
* \brief Initialize the ACIFC module.
*
* \note Enables the ACIFC module's source clock.
*
* \param[out] dev_inst Driver structure pointer
* \param[in] ac Module hardware register base address pointer
* \param[in] cfg Module configuration structure pointer
*
* \return Status of initialization.
* \retval STATUS_OK Module initiated correctly
* \retval STATUS_ERR_DENIED Module has already been enabled
* \retval STATUS_ERR_BUSY Module is busy performing a comparison
*/
enum status_code ac_init(
struct ac_dev_inst *const dev_inst,
Acifc *const ac,
struct ac_config *const cfg)
{
/* Sanity check arguments. */
Assert(dev_inst);
Assert(ac);
Assert(cfg);
uint32_t ac_ctrl = ac->ACIFC_CTRL;
/* Check if module is enabled. */
if (ac_ctrl & ACIFC_CTRL_EN) {
return STATUS_ERR_DENIED;
}
/* Check if comparison is in progress. */
if (ac_ctrl & ACIFC_CTRL_USTART) {
return STATUS_ERR_BUSY;
}
/* Enable and configure device instance */
dev_inst->hw_dev = ac;
sysclk_enable_peripheral_clock(ac);
_ac_set_config(dev_inst, cfg);
_ac_instance = (struct ac_dev_inst *)dev_inst;
return STATUS_OK;
}
/** \brief Initializes and configures the Analog Comparator driver.
*
* Initializes the Analog Comparator driver, configuring it to the user
* supplied configuration parameters, ready for use. This function should be
* called before enabling the Analog Comparator.
*
* \note Once called the Analog Comparator will not be running; to start the
* Analog Comparator call \ref ac_enable() after configuring the module.
*
* \param[out] module_inst Pointer to the AC software instance struct
* \param[in] hw Pointer to the AC module instance
* \param[in] config Pointer to the config struct, created by the user
* application
*/
enum status_code ac_init(
struct ac_module *const module_inst,
Ac *const hw,
struct ac_config *const config)
{
/* Sanity check arguments */
Assert(module_inst);
Assert(hw);
Assert(config);
/* Initialize device instance */
module_inst->hw = hw;
#if (SAML21)
/* Turn on the digital interface clock */
system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBD, MCLK_APBDMASK_AC);
#else
/* Turn on the digital interface clock */
system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, MCLK_APBCMASK_AC);
#endif
#if AC_CALLBACK_MODE == true
/* Initialize parameters */
for (uint8_t i = 0; i < AC_CALLBACK_N; i++) {
module_inst->callback[i] = NULL;
}
/* Initialize software flags*/
module_inst->register_callback_mask = 0x00;
module_inst->enable_callback_mask = 0x00;
# if (AC_INST_NUM == 1)
_ac_instance[0] = module_inst;
# else
/* Register this instance for callbacks*/
_ac_instance[_ac_get_inst_index(hw)] = module_inst;
# endif
#endif
/* Write configuration to module */
return _ac_set_config(module_inst, config);
}