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* Removed syscall.c since this is not required. Implementation done in mbed retarget.cpp file. 

* Removed rtc_count.h and rtc_count.c since we are porting rtc calendar driver from asf. Keep both drivers for the same peripheral make error in compilation after exporting.
pull/1214/head
akhilpanayamparambil 2015-06-08 11:19:52 +05:30 committed by Karthik Purushothaman
parent ce20024b88
commit 52fda8b159
3 changed files with 0 additions and 2105 deletions
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131
libraries/mbed/targets/cmsis/TARGET_Atmel/TARGET_SAM21/utils/syscalls/gcc/syscalls.c
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@ -1,131 +0,0 @@
/**
* \file
*
* \brief Syscalls for SAM0 (GCC).
*
* Copyright (C) 2012-2014 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/**
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include <stdio.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef __cplusplus
extern "C" {
#endif
#undef errno
extern int errno;
extern int _end;
extern caddr_t _sbrk(int incr);
extern int link(char *old, char *new);
extern int _close(int file);
extern int _fstat(int file, struct stat *st);
extern int _isatty(int file);
extern int _lseek(int file, int ptr, int dir);
extern void _exit(int status);
extern void _kill(int pid, int sig);
extern int _getpid(void);
extern caddr_t _sbrk(int incr)
{
static unsigned char *heap = NULL;
unsigned char *prev_heap;
if (heap == NULL) {
heap = (unsigned char *)&_end;
}
prev_heap = heap;
heap += incr;
return (caddr_t) prev_heap;
}
extern int link(char *old, char *new)
{
return -1;
}
extern int _close(int file)
{
return -1;
}
extern int _fstat(int file, struct stat *st)
{
st->st_mode = S_IFCHR;
return 0;
}
extern int _isatty(int file)
{
return 1;
}
extern int _lseek(int file, int ptr, int dir)
{
return 0;
}
extern void _exit(int status)
{
printf("Exiting with status %d.\n", status);
for (;;);
}
extern void _kill(int pid, int sig)
{
return;
}
extern int _getpid(void)
{
return -1;
}
#ifdef __cplusplus
}
#endif

1201
libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM21/drivers/rtc/rtc_count.h
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773
libraries/mbed/targets/hal/TARGET_Atmel/TARGET_SAM21/drivers/rtc/rtc_sam_d_r/rtc_count.c
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@ -1,773 +0,0 @@
/**
* \file
*
* \brief SAM RTC Driver (Count Mode)
*
* Copyright (C) 2012-2014 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/**
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include "rtc_count.h"
#include <gclk.h>
#if !defined(__DOXYGEN__)
struct rtc_module *_rtc_instance[RTC_INST_NUM];
#endif
/**
* \brief Determines if the hardware module(s) are currently synchronizing to the bus.
*
* Checks to see if the underlying hardware peripheral module(s) are currently
* synchronizing across multiple clock domains to the hardware bus, This
* function can be used to delay further operations on a module until such time
* that it is ready, to prevent blocking delays for synchronization in the
* user application.
*
* \param[in] module RTC hardware module
*
* \return Synchronization status of the underlying hardware module(s).
*
* \retval true if the module synchronization is ongoing
* \retval false if the module has completed synchronization
*/
static bool rtc_count_is_syncing(struct rtc_module *const module)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
if (rtc_module->MODE0.STATUS.reg & RTC_STATUS_SYNCBUSY) {
return true;
}
return false;
}
/**
* \brief Enables the RTC module.
*
* Enables the RTC module once it has been configured, ready for use. Most
* module configuration parameters cannot be altered while the module is enabled.
*
* \param[in,out] module RTC hardware module
*/
void rtc_count_enable(struct rtc_module *const module)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
#if RTC_COUNT_ASYNC == true
system_interrupt_enable(SYSTEM_INTERRUPT_MODULE_RTC);
#endif
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
/* Enable RTC module. */
rtc_module->MODE0.CTRL.reg |= RTC_MODE0_CTRL_ENABLE;
}
/**
* \brief Disables the RTC module.
*
* Disables the RTC module.
*
* \param[in,out] module RTC hardware module
*/
void rtc_count_disable(struct rtc_module *const module)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
#if RTC_COUNT_ASYNC == true
system_interrupt_disable(SYSTEM_INTERRUPT_MODULE_RTC);
#endif
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
/* Disable RTC module. */
rtc_module->MODE0.CTRL.reg &= ~RTC_MODE0_CTRL_ENABLE;
}
/**
* \brief Resets the RTC module.
* Resets the RTC to hardware defaults.
*
* \param[in,out] module Pointer to the software instance struct
*/
void rtc_count_reset(struct rtc_module *const module)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
/* Disable module before reset. */
rtc_count_disable(module);
#if RTC_COUNT_ASYNC == true
module->registered_callback = 0;
module->enabled_callback = 0;
#endif
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
/* Initiate software reset. */
rtc_module->MODE0.CTRL.reg |= RTC_MODE0_CTRL_SWRST;
}
/**
* \internal Applies the given configuration.
*
* Sets the configurations given from the configuration structure to the
* hardware module.
*
* \param[in,out] module Pointer to the software instance struct
* \param[in] config Pointer to the configuration structure.
*
* \return Status of the configuration procedure.
* \retval STATUS_OK RTC configurations was set successfully.
* \retval STATUS_ERR_INVALID_ARG If invalid argument(s) were given.
*/
static enum status_code _rtc_count_set_config(
struct rtc_module *const module,
const struct rtc_count_config *const config)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
rtc_module->MODE0.CTRL.reg = RTC_MODE0_CTRL_MODE(0) | config->prescaler;
/* Set mode and clear on match if applicable. */
switch (config->mode) {
case RTC_COUNT_MODE_32BIT:
/* Set 32bit mode and clear on match if applicable. */
rtc_module->MODE0.CTRL.reg |= RTC_MODE0_CTRL_MODE(0);
/* Check if clear on compare match should be set. */
if (config->clear_on_match) {
/* Set clear on match. */
rtc_module->MODE0.CTRL.reg |= RTC_MODE0_CTRL_MATCHCLR;
}
/* Set compare values. */
for (uint8_t i = 0; i < RTC_NUM_OF_COMP32; i++) {
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
rtc_count_set_compare(module, config->compare_values[i],
(enum rtc_count_compare)i);
}
break;
case RTC_COUNT_MODE_16BIT:
/* Set 16bit mode. */
rtc_module->MODE1.CTRL.reg |= RTC_MODE1_CTRL_MODE(1);
/* Check if match on clear is set, and return invalid
* argument if set. */
if (config->clear_on_match) {
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
/* Set compare values. */
for (uint8_t i = 0; i < RTC_NUM_OF_COMP16; i++) {
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
rtc_count_set_compare(module, config->compare_values[i],
(enum rtc_count_compare)i);
}
break;
default:
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
/* Check to set continuously clock read update mode. */
if (config->continuously_update) {
/* Set continuously mode. */
rtc_module->MODE0.READREQ.reg |= RTC_READREQ_RCONT;
}
/* Return status OK if everything was configured. */
return STATUS_OK;
}
/**
* \brief Initializes the RTC module with given configurations.
*
* Initializes the module, setting up all given configurations to provide
* the desired functionality of the RTC.
*
* \param[out] module Pointer to the software instance struct
* \param[in] hw Pointer to hardware instance
* \param[in] config Pointer to the configuration structure.
*
* \return Status of the initialization procedure.
* \retval STATUS_OK If the initialization was run stressfully.
* \retval STATUS_ERR_INVALID_ARG If invalid argument(s) were given.
*/
enum status_code rtc_count_init(
struct rtc_module *const module,
Rtc *const hw,
const struct rtc_count_config *const config)
{
/* Sanity check arguments */
Assert(module);
Assert(hw);
Assert(config);
/* Initialize device instance */
module->hw = hw;
/* Turn on the digital interface clock */
system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBA, PM_APBAMASK_RTC);
/* Set up GCLK */
struct system_gclk_chan_config gclk_chan_conf;
system_gclk_chan_get_config_defaults(&gclk_chan_conf);
gclk_chan_conf.source_generator = GCLK_GENERATOR_2;
system_gclk_chan_set_config(RTC_GCLK_ID, &gclk_chan_conf);
system_gclk_chan_enable(RTC_GCLK_ID);
/* Reset module to hardware defaults. */
rtc_count_reset(module);
/* Save conf_struct internally for continued use. */
module->mode = config->mode;
module->continuously_update = config->continuously_update;
# if (RTC_INST_NUM == 1)
_rtc_instance[0] = module;
# else
/* Register this instance for callbacks*/
_rtc_instance[_rtc_get_inst_index(hw)] = module;
# endif
/* Set config and return status. */
return _rtc_count_set_config(module, config);
}
/**
* \brief Set the current count value to desired value.
*
* Sets the value of the counter to the specified value.
*
* \param[in,out] module Pointer to the software instance struct
* \param[in] count_value The value to be set in count register.
*
* \return Status of setting the register.
* \retval STATUS_OK If everything was executed correctly.
* \retval STATUS_ERR_INVALID_ARG If invalid argument(s) were provided.
*/
enum status_code rtc_count_set_count(
struct rtc_module *const module,
const uint32_t count_value)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
/* Set count according to mode */
switch(module->mode){
case RTC_COUNT_MODE_32BIT:
/* Write value to register. */
rtc_module->MODE0.COUNT.reg = count_value;
break;
case RTC_COUNT_MODE_16BIT:
/* Check if 16-bit value is provided. */
if(count_value > 0xffff){
return STATUS_ERR_INVALID_ARG;
}
/* Write value to register. */
rtc_module->MODE1.COUNT.reg = (uint32_t)count_value;
break;
default:
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
return STATUS_OK;
}
/**
* \brief Get the current count value.
*
* \param[in,out] module Pointer to the software instance struct
*
* Returns the current count value.
*
* \return The current counter value as a 32-bit unsigned integer.
*/
uint32_t rtc_count_get_count(struct rtc_module *const module)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
/* Initialize return value. */
uint32_t ret_val;
/* Change of read method based on value of continuously_update value in
* the configuration structure. */
if(!(module->continuously_update)) {
/* Request read on count register. */
rtc_module->MODE0.READREQ.reg = RTC_READREQ_RREQ;
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
}
/* Read value based on mode. */
switch (module->mode) {
case RTC_COUNT_MODE_32BIT:
/* Return count value in 32-bit mode. */
ret_val = rtc_module->MODE0.COUNT.reg;
break;
case RTC_COUNT_MODE_16BIT:
/* Return count value in 16-bit mode. */
ret_val = (uint32_t)rtc_module->MODE1.COUNT.reg;
break;
default:
Assert(false);
/* Counter not initialized. Assume counter value 0.*/
ret_val = 0;
break;
}
return ret_val;
}
/**
* \brief Set the compare value for the specified compare.
*
* Sets the value specified by the implementer to the requested compare.
*
* \note Compare 4 and 5 are only available in 16-bit mode.
*
* \param[in,out] module Pointer to the software instance struct
* \param[in] comp_value The value to be written to the compare.
* \param[in] comp_index Index of the compare to set.
*
* \return Status indicating if compare was successfully set.
* \retval STATUS_OK If compare was successfully set.
* \retval STATUS_ERR_INVALID_ARG If invalid argument(s) were provided.
* \retval STATUS_ERR_BAD_FORMAT If the module was not initialized in a mode.
*/
enum status_code rtc_count_set_compare(
struct rtc_module *const module,
const uint32_t comp_value,
const enum rtc_count_compare comp_index)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
/* Set compare values based on operation mode. */
switch (module->mode) {
case RTC_COUNT_MODE_32BIT:
/* Check sanity of comp_index. */
if ((uint32_t)comp_index > RTC_NUM_OF_COMP32) {
return STATUS_ERR_INVALID_ARG;
}
/* Set compare value for COMP. */
rtc_module->MODE0.COMP[comp_index].reg = comp_value;
break;
case RTC_COUNT_MODE_16BIT:
/* Check sanity of comp_index. */
if ((uint32_t)comp_index > RTC_NUM_OF_COMP16) {
return STATUS_ERR_INVALID_ARG;
}
/* Check that 16-bit value is provided. */
if (comp_value > 0xffff) {
Assert(false);
return STATUS_ERR_INVALID_ARG;
}
/* Set compare value for COMP. */
rtc_module->MODE1.COMP[comp_index].reg = comp_value & 0xffff;
break;
default:
Assert(false);
return STATUS_ERR_BAD_FORMAT;
}
/* Return status if everything is OK. */
return STATUS_OK;
}
/**
* \brief Get the current compare value of specified compare.
*
* Retrieves the current value of the specified compare.
*
* \note Compare 4 and 5 are only available in 16-bit mode.
*
* \param[in,out] module Pointer to the software instance struct
* \param[out] comp_value Pointer to 32-bit integer that will be populated with
* the current compare value.
* \param[in] comp_index Index of compare to check.
*
* \return Status of the reading procedure.
* \retval STATUS_OK If the value was read correctly.
* \retval STATUS_ERR_INVALID_ARG If invalid argument(s) were provided.
* \retval STATUS_ERR_BAD_FORMAT If the module was not initialized in a mode.
*/
enum status_code rtc_count_get_compare(
struct rtc_module *const module,
uint32_t *const comp_value,
const enum rtc_count_compare comp_index)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
switch (module->mode) {
case RTC_COUNT_MODE_32BIT:
/* Check sanity of comp_index. */
if ((uint32_t)comp_index > RTC_NUM_OF_COMP32) {
return STATUS_ERR_INVALID_ARG;
}
/* Get compare value for COMP. */
*comp_value = rtc_module->MODE0.COMP[comp_index].reg;
break;
case RTC_COUNT_MODE_16BIT:
/* Check sanity of comp_index. */
if ((uint32_t)comp_index > RTC_NUM_OF_COMP16) {
return STATUS_ERR_INVALID_ARG;
}
/* Get compare value for COMP. */
*comp_value = (uint32_t)rtc_module->MODE1.COMP[comp_index].reg;
break;
default:
Assert(false);
return STATUS_ERR_BAD_FORMAT;
}
/* Return status showing everything is OK. */
return STATUS_OK;
}
/**
* \brief Retrieves the value of period.
*
* Retrieves the value of the period for the 16-bit mode counter.
*
* \note Only available in 16-bit mode.
*
* \param[in,out] module Pointer to the software instance struct
* \param[out] period_value Pointer to value for return argument.
*
* \return Status of getting the period value.
* \retval STATUS_OK If the period value was read correctly.
* \retval STATUS_ERR_UNSUPPORTED_DEV If incorrect mode was set.
*/
enum status_code rtc_count_get_period(
struct rtc_module *const module,
uint16_t *const period_value)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
/* Check that correct mode is set. */
if (module->mode != RTC_COUNT_MODE_16BIT) {
return STATUS_ERR_UNSUPPORTED_DEV;
}
/* Returns the value. */
*period_value = rtc_module->MODE1.PER.reg;
return STATUS_OK;
}
/**
* \brief Set the given value to the period.
*
* Sets the given value to the period.
*
* \note Only available in 16-bit mode.
*
* \param[in,out] module Pointer to the software instance struct
* \param[in] period_value The value to set to the period.
*
* \return Status of setting the period value.
* \retval STATUS_OK If the period was set correctly.
* \retval STATUS_ERR_UNSUPPORTED_DEV If module is not operated in 16-bit mode.
*/
enum status_code rtc_count_set_period(
struct rtc_module *const module,
const uint16_t period_value)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
/* Check that correct mode is set. */
if (module->mode != RTC_COUNT_MODE_16BIT) {
return STATUS_ERR_UNSUPPORTED_DEV;
}
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
/* Write value to register. */
rtc_module->MODE1.PER.reg = period_value;
return STATUS_OK;
}
/**
* \brief Check if RTC compare match has occurred.
*
* Checks the compare flag to see if a match has occurred. The compare flag is
* set when there is a compare match between counter and the compare.
*
* \note Compare 4 and 5 are only available in 16-bit mode.
*
* \param[in,out] module Pointer to the software instance struct
* \param[in] comp_index Index of compare to check current flag.
*/
bool rtc_count_is_compare_match(
struct rtc_module *const module,
const enum rtc_count_compare comp_index)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
/* Check sanity. */
switch (module->mode) {
case RTC_COUNT_MODE_32BIT:
/* Check sanity for 32-bit mode. */
if (comp_index > RTC_NUM_OF_COMP32) {
return false;
}
break;
case RTC_COUNT_MODE_16BIT:
/* Check sanity for 16-bit mode. */
if (comp_index > RTC_NUM_OF_COMP16) {
return false;
}
break;
default:
Assert(false);
return false;
}
/* Set status of INTFLAG as return argument. */
return (rtc_module->MODE0.INTFLAG.reg & (1 << comp_index));
}
/**
* \brief Clears RTC compare match flag.
*
* Clears the compare flag. The compare flag is set when there is a compare
* match between the counter and the compare.
*
* \note Compare 4 and 5 are only available in 16-bit mode.
*
* \param[in,out] module Pointer to the software instance struct
* \param[in] comp_index Index of compare to check current flag.
*
* \return Status indicating if flag was successfully cleared.
* \retval STATUS_OK If flag was successfully cleared.
* \retval STATUS_ERR_INVALID_ARG If invalid argument(s) were provided.
* \retval STATUS_ERR_BAD_FORMAT If the module was not initialized in a mode.
*/
enum status_code rtc_count_clear_compare_match(
struct rtc_module *const module,
const enum rtc_count_compare comp_index)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
/* Check sanity. */
switch (module->mode){
case RTC_COUNT_MODE_32BIT:
/* Check sanity for 32-bit mode. */
if (comp_index > RTC_NUM_OF_COMP32) {
return STATUS_ERR_INVALID_ARG;
}
break;
case RTC_COUNT_MODE_16BIT:
/* Check sanity for 16-bit mode. */
if (comp_index > RTC_NUM_OF_COMP16) {
return STATUS_ERR_INVALID_ARG;
}
break;
default:
Assert(false);
return STATUS_ERR_BAD_FORMAT;
}
/* Clear INTFLAG. */
rtc_module->MODE0.INTFLAG.reg = RTC_MODE1_INTFLAG_CMP(1 << comp_index);
return STATUS_OK;
}
/**
* \brief Calibrate for too-slow or too-fast oscillator.
*
* When used, the RTC will compensate for an inaccurate oscillator. The
* RTC module will add or subtract cycles from the RTC prescaler to adjust the
* frequency in approximately 1 PPM steps. The provided correction value should
* be between 0 and 127, allowing for a maximum 127 PPM correction.
*
* If no correction is needed, set value to zero.
*
* \note Can only be used when the RTC is operated in 1Hz.
*
* \param[in,out] module Pointer to the software instance struct
* \param[in] value Ranging from -127 to 127 used for the correction.
*
* \return Status of the calibration procedure.
* \retval STATUS_OK If calibration was executed correctly.
* \retval STATUS_ERR_INVALID_ARG If invalid argument(s) were provided.
*/
enum status_code rtc_count_frequency_correction(
struct rtc_module *const module,
const int8_t value)
{
/* Sanity check arguments */
Assert(module);
Assert(module->hw);
Rtc *const rtc_module = module->hw;
/* Check if valid argument. */
if (abs(value) > 0x7F) {
/* Value bigger than allowed, return invalid argument. */
return STATUS_ERR_INVALID_ARG;
}
uint32_t new_correction_value;
/* Load the new correction value as a positive value, sign added later */
new_correction_value = abs(value);
/* Convert to positive value and adjust register sign bit. */
if (value < 0) {
new_correction_value |= RTC_FREQCORR_SIGN;
}
while (rtc_count_is_syncing(module)) {
/* Wait for synchronization */
}
/* Set value. */
rtc_module->MODE0.FREQCORR.reg = new_correction_value;
return STATUS_OK;
}