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/** input/output pin identifier
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* @ file
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* @ author King Kévin < kingkevin @ cuvoodoo . info >
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* @ copyright SPDX - License - Identifier : GPL - 3.0 - or - later
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* @ date 2016 - 2021
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*/
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/* standard libraries */
# include <stdint.h> // standard integer types
# include <stdlib.h> // standard utilities
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# include <string.h> // string utilities
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# include <time.h> // date/time utilities
# include <ctype.h> // utilities to check chars
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/* STM32 (including CM3) libraries */
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# include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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# include <libopencm3/cm3/scb.h> // vector table definition
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# include <libopencm3/cm3/nvic.h> // interrupt utilities
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# include <libopencm3/stm32/gpio.h> // general purpose input output library
# include <libopencm3/stm32/rcc.h> // real-time control clock library
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# include <libopencm3/stm32/exti.h> // external interrupt utilities
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# include <libopencm3/stm32/rtc.h> // real time clock utilities
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# include <libopencm3/stm32/iwdg.h> // independent watchdog utilities
# include <libopencm3/stm32/dbgmcu.h> // debug utilities
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# include <libopencm3/stm32/desig.h> // design utilities
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# include <libopencm3/stm32/flash.h> // flash utilities
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/* own libraries */
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# include "global.h" // board definitions
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# include "print.h" // printing utilities
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# include "uart.h" // USART utilities
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# include "usb_cdcacm.h" // USB CDC ACM utilities
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# include "terminal.h" // handle the terminal interface
# include "menu.h" // menu utilities
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/** watchdog period in ms */
# define WATCHDOG_PERIOD 10000
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/** wakeup frequency (i.e. least number of times per second to perform the main loop) */
# define WAKEUP_FREQ 16
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/** @defgroup main_flags flag set in interrupts to be processed in main task
* @ {
*/
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static volatile bool wakeup_flag = false ; /**< flag set when wakeup timer triggered */
static volatile bool second_flag = false ; /**< flag set when a second passed */
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/** @} */
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/** number of seconds since boot */
static uint32_t boot_time = 0 ;
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size_t putc ( char c )
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{
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size_t length = 0 ; // number of characters printed
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static char last_c = 0 ; // to remember on which character we last sent
if ( ' \n ' = = c ) { // send carriage return (CR) + line feed (LF) newline for each LF
if ( ' \r ' ! = last_c ) { // CR has not already been sent
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uart_putchar_nonblocking ( ' \r ' ) ; // send CR over USART
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usb_cdcacm_putchar ( ' \r ' ) ; // send CR over USB
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length + + ; // remember we printed 1 character
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}
}
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uart_putchar_nonblocking ( c ) ; // send byte over USART
usb_cdcacm_putchar ( c ) ; // send byte over USB
length + + ; // remember we printed 1 character
last_c = c ; // remember last character
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return length ; // return number of characters printed
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}
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// menu commands
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/** display available commands
* @ param [ in ] argument no argument required
*/
static void command_help ( void * argument ) ;
/** show software and hardware version
* @ param [ in ] argument no argument required
*/
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static void command_version ( void * argument )
{
( void ) argument ; // we won't use the argument
printf ( " firmware date: %04u-%02u-%02u \n " , BUILD_YEAR , BUILD_MONTH , BUILD_DAY ) ; // show firmware build date
printf ( " device serial: %08x%08x%08x \n " , DESIG_UNIQUE_ID2 , DESIG_UNIQUE_ID1 , DESIG_UNIQUE_ID0 ) ; // show complete serial (different than the one used for USB)
}
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/** convert RTC date/time to number of seconds
* @ return number of seconds since 2000 - 01 - 01 00 : 00 : 00
* @ warning for simplicity I consider every month to have 31 days
*/
static uint32_t rtc_to_seconds ( void )
{
rtc_wait_for_synchro ( ) ; // wait until date/time is synchronised
const uint8_t year = ( ( RTC_DR > > RTC_DR_YT_SHIFT ) & RTC_DR_YT_MASK ) * 10 + ( ( RTC_DR > > RTC_DR_YU_SHIFT ) & RTC_DR_YU_MASK ) ; // get year
uint8_t month = ( ( RTC_DR > > RTC_DR_MT_SHIFT ) & RTC_DR_MT_MASK ) * 10 + ( ( RTC_DR > > RTC_DR_MU_SHIFT ) & RTC_DR_MU_MASK ) ; // get month
if ( month > 0 ) { // month has been initialized, but starts with 1
month - - ; // fix for calculation
}
uint8_t day = ( ( RTC_DR > > RTC_DR_DT_SHIFT ) & RTC_DR_DT_MASK ) * 10 + ( ( RTC_DR > > RTC_DR_DU_SHIFT ) & RTC_DR_DU_MASK ) ; // get day
if ( day > 0 ) { // day has been initialized, but starts with 1
day - - ; // fix for calculation
}
const uint8_t hour = ( ( RTC_TR > > RTC_TR_HT_SHIFT ) & RTC_TR_HT_MASK ) * 10 + ( ( RTC_TR > > RTC_TR_HU_SHIFT ) & RTC_TR_HU_MASK ) ; // get hours
const uint8_t minute = ( ( RTC_TR > > RTC_TR_MNT_SHIFT ) & RTC_TR_MNT_MASK ) * 10 + ( ( RTC_TR > > RTC_TR_MNU_SHIFT ) & RTC_TR_MNU_MASK ) ; // get minutes
const uint8_t second = ( ( RTC_TR > > RTC_TR_ST_SHIFT ) & RTC_TR_ST_MASK ) * 10 + ( ( RTC_TR > > RTC_TR_SU_SHIFT ) & RTC_TR_SU_MASK ) ; // get seconds
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const uint32_t seconds = ( ( ( ( ( ( ( ( year * 12 ) + month ) * 31 ) + day ) * 24 ) + hour ) * 60 ) + minute ) * 60 + second ; // convert to number of seconds
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return seconds ;
}
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/** show uptime
* @ param [ in ] argument no argument required
*/
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static void command_uptime ( void * argument )
{
( void ) argument ; // we won't use the argument
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const uint32_t uptime = rtc_to_seconds ( ) - boot_time ; // get time from internal RTC
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printf ( " uptime: %u.%02u:%02u:%02u \n " , uptime / ( 24 * 60 * 60 ) , ( uptime / ( 60 * 60 ) ) % 24 , ( uptime / 60 ) % 60 , uptime % 60 ) ;
}
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/** show date and time
* @ param [ in ] argument date and time to set
*/
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static void command_datetime ( void * argument )
{
char * datetime = ( char * ) argument ; // argument is optional date time
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const char * days [ ] = { " ?? " , " Mo " , " Tu " , " We " , " Th " , " Fr " , " Sa " , " Su " } ; // the days of the week
// set date
if ( datetime ) { // date has been provided
// parse date
const char * malformed = " date and time malformed, expecting YYYY-MM-DD WD HH:MM:SS \n " ;
if ( strlen ( datetime ) ! = ( 4 + 1 + 2 + 1 + 2 ) + 1 + 2 + 1 + ( 2 + 1 + 2 + 1 + 2 ) ) { // verify date/time is long enough
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printf ( malformed ) ;
return ;
}
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if ( ! ( isdigit ( ( int8_t ) datetime [ 0 ] ) & & isdigit ( ( int8_t ) datetime [ 1 ] ) & & isdigit ( ( int8_t ) datetime [ 2 ] ) & & isdigit ( ( int8_t ) datetime [ 3 ] ) & & \
' - ' = = datetime [ 4 ] & & \
isdigit ( ( int8_t ) datetime [ 5 ] ) & & isdigit ( ( int8_t ) datetime [ 6 ] ) & & \
' - ' = = datetime [ 7 ] & & \
isdigit ( ( int8_t ) datetime [ 8 ] ) & & isdigit ( ( int8_t ) datetime [ 9 ] ) & & \
' ' = = datetime [ 10 ] & & \
isalpha ( ( int8_t ) datetime [ 11 ] ) & & isalpha ( ( int8_t ) datetime [ 12 ] ) & & \
' ' = = datetime [ 13 ] & & \
isdigit ( ( int8_t ) datetime [ 14 ] ) & & isdigit ( ( int8_t ) datetime [ 15 ] ) & & \
' : ' = = datetime [ 16 ] & & \
isdigit ( ( int8_t ) datetime [ 17 ] ) & & isdigit ( ( int8_t ) datetime [ 18 ] ) & & \
' : ' = = datetime [ 19 ] & & \
isdigit ( ( int8_t ) datetime [ 20 ] ) & & isdigit ( ( int8_t ) datetime [ 21 ] ) ) ) { // verify format (good enough to not fail parsing)
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printf ( malformed ) ;
return ;
}
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const uint16_t year = strtol ( & datetime [ 0 ] , NULL , 10 ) ; // parse year
if ( year < = 2000 | | year > 2099 ) {
puts ( " year out of range \n " ) ;
return ;
}
const uint8_t month = strtol ( & datetime [ 5 ] , NULL , 10 ) ; // parse month
if ( month < 1 | | month > 12 ) {
puts ( " month out of range \n " ) ;
return ;
}
const uint8_t day = strtol ( & datetime [ 8 ] , NULL , 10 ) ; // parse day
if ( day < 1 | | day > 31 ) {
puts ( " day out of range \n " ) ;
return ;
}
const uint8_t hour = strtol ( & datetime [ 14 ] , NULL , 10 ) ; // parse hour
if ( hour > 24 ) {
puts ( " hour out of range \n " ) ;
return ;
}
const uint8_t minute = strtol ( & datetime [ 17 ] , NULL , 10 ) ; // parse minutes
if ( minute > 59 ) {
puts ( " minute out of range \n " ) ;
return ;
}
const uint8_t second = strtol ( & datetime [ 30 ] , NULL , 10 ) ; // parse seconds
if ( second > 59 ) {
puts ( " second out of range \n " ) ;
return ;
}
uint8_t week_day = 0 ;
for ( uint8_t i = 1 ; i < LENGTH ( days ) & & 0 = = week_day ; i + + ) {
if ( days [ i ] [ 0 ] = = toupper ( datetime [ 11 ] ) & & days [ i ] [ 1 ] = = tolower ( datetime [ 12 ] ) ) {
week_day = i ;
break ;
}
}
if ( 0 = = week_day ) {
puts ( " unknown week day \n " ) ;
return ;
}
uint32_t date = 0 ; // to build the date
date | = ( ( ( year - 2000 ) / 10 ) & RTC_DR_YT_MASK ) < < RTC_DR_YT_SHIFT ; // set year tenth
date | = ( ( ( year - 2000 ) % 10 ) & RTC_DR_YU_MASK ) < < RTC_DR_YU_SHIFT ; // set year unit
date | = ( ( month / 10 ) & RTC_DR_MT_MASK ) < < RTC_DR_MT_SHIFT ; // set month tenth
date | = ( ( month % 10 ) & RTC_DR_MU_MASK ) < < RTC_DR_MU_SHIFT ; // set month unit
date | = ( ( day / 10 ) & RTC_DR_DT_MASK ) < < RTC_DR_DT_SHIFT ; // set day tenth
date | = ( ( day % 10 ) & RTC_DR_DU_MASK ) < < RTC_DR_DU_SHIFT ; // set day unit
date | = ( week_day & RTC_DR_WDU_MASK ) < < RTC_DR_WDU_SHIFT ; // time day of the week
uint32_t time = 0 ; // to build the time
time = 0 ; // reset time
time | = ( ( hour / 10 ) & RTC_TR_HT_MASK ) < < RTC_TR_HT_SHIFT ; // set hour tenth
time | = ( ( hour % 10 ) & RTC_TR_HU_MASK ) < < RTC_TR_HU_SHIFT ; // set hour unit
time | = ( ( minute / 10 ) & RTC_TR_MNT_MASK ) < < RTC_TR_MNT_SHIFT ; // set minute tenth
time | = ( ( minute % 10 ) & RTC_TR_MNU_MASK ) < < RTC_TR_MNU_SHIFT ; // set minute unit
time | = ( ( second / 10 ) & RTC_TR_ST_MASK ) < < RTC_TR_ST_SHIFT ; // set second tenth
time | = ( ( second % 10 ) & RTC_TR_SU_MASK ) < < RTC_TR_SU_SHIFT ; // set second unit
// write date
pwr_disable_backup_domain_write_protect ( ) ; // disable backup protection so we can set the RTC clock source
rtc_unlock ( ) ; // enable writing RTC registers
RTC_ISR | = RTC_ISR_INIT ; // enter initialisation mode
while ( ! ( RTC_ISR & RTC_ISR_INITF ) ) ; // wait to enter initialisation mode
RTC_DR = date ; // set date
RTC_TR = time ; // set time
RTC_ISR & = ~ RTC_ISR_INIT ; // exit initialisation mode
rtc_lock ( ) ; // protect RTC register against writing
pwr_enable_backup_domain_write_protect ( ) ; // re-enable protection now that we configured the RTC clock
}
// show date
if ( ! ( RTC_ISR & RTC_ISR_INITS ) ) { // date has not been set yet
puts ( " date/time not initialized \n " ) ;
} else {
rtc_wait_for_synchro ( ) ; // wait until date/time is synchronised
const uint8_t year = ( ( RTC_DR > > RTC_DR_YT_SHIFT ) & RTC_DR_YT_MASK ) * 10 + ( ( RTC_DR > > RTC_DR_YU_SHIFT ) & RTC_DR_YU_MASK ) ; // get year
const uint8_t month = ( ( RTC_DR > > RTC_DR_MT_SHIFT ) & RTC_DR_MT_MASK ) * 10 + ( ( RTC_DR > > RTC_DR_MU_SHIFT ) & RTC_DR_MU_MASK ) ; // get month
const uint8_t day = ( ( RTC_DR > > RTC_DR_DT_SHIFT ) & RTC_DR_DT_MASK ) * 10 + ( ( RTC_DR > > RTC_DR_DU_SHIFT ) & RTC_DR_DU_MASK ) ; // get day
const uint8_t week_day = ( ( RTC_DR > > RTC_DR_WDU_SHIFT ) & RTC_DR_WDU_MASK ) ; // get week day
const uint8_t hour = ( ( RTC_TR > > RTC_TR_HT_SHIFT ) & RTC_TR_HT_MASK ) * 10 + ( ( RTC_TR > > RTC_TR_HU_SHIFT ) & RTC_TR_HU_MASK ) ; // get hours
const uint8_t minute = ( ( RTC_TR > > RTC_TR_MNT_SHIFT ) & RTC_TR_MNT_MASK ) * 10 + ( ( RTC_TR > > RTC_TR_MNU_SHIFT ) & RTC_TR_MNU_MASK ) ; // get minutes
const uint8_t second = ( ( RTC_TR > > RTC_TR_ST_SHIFT ) & RTC_TR_ST_MASK ) * 10 + ( ( RTC_TR > > RTC_TR_SU_SHIFT ) & RTC_TR_SU_MASK ) ; // get seconds
printf ( " date: 20%02d-%02d-%02d %s %02d:%02d:%02d \n " , year , month , day , days [ week_day ] , hour , minute , second ) ;
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}
}
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/** reset board
* @ param [ in ] argument no argument required
*/
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static void command_reset ( void * argument )
{
( void ) argument ; // we won't use the argument
scb_reset_system ( ) ; // reset device
while ( true ) ; // wait for the reset to happen
}
/** switch to system memory (e.g. embedded bootloader)
* @ param [ in ] argument no argument required
*/
static void command_system ( void * argument )
{
( void ) argument ; // we won't use the argument
system_memory ( ) ; // jump to system memory
}
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/** switch to DFU bootloader
* @ param [ in ] argument no argument required
*/
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static void command_bootloader ( void * argument )
{
( void ) argument ; // we won't use the argument
dfu_bootloader ( ) ; // start DFU bootloader
}
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/** list of all supported commands */
static const struct menu_command_t menu_commands [ ] = {
{
. shortcut = ' h ' ,
. name = " help " ,
. command_description = " display help " ,
. argument = MENU_ARGUMENT_NONE ,
. argument_description = NULL ,
. command_handler = & command_help ,
} ,
{
. shortcut = ' v ' ,
. name = " version " ,
. command_description = " show software and hardware version " ,
. argument = MENU_ARGUMENT_NONE ,
. argument_description = NULL ,
. command_handler = & command_version ,
} ,
{
. shortcut = ' u ' ,
. name = " uptime " ,
. command_description = " show uptime " ,
. argument = MENU_ARGUMENT_NONE ,
. argument_description = NULL ,
. command_handler = & command_uptime ,
} ,
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{
. shortcut = ' d ' ,
. name = " date " ,
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. command_description = " show/set date and time " ,
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. argument = MENU_ARGUMENT_STRING ,
. argument_description = " [YYYY-MM-DD HH:MM:SS] " ,
. command_handler = & command_datetime ,
} ,
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{
. shortcut = ' r ' ,
. name = " reset " ,
. command_description = " reset board " ,
. argument = MENU_ARGUMENT_NONE ,
. argument_description = NULL ,
. command_handler = & command_reset ,
} ,
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{
. shortcut = ' s ' ,
. name = " system " ,
. command_description = " reboot into system memory " ,
. argument = MENU_ARGUMENT_NONE ,
. argument_description = NULL ,
. command_handler = & command_system ,
} ,
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{
. shortcut = ' b ' ,
. name = " bootloader " ,
. command_description = " reboot into DFU bootloader " ,
. argument = MENU_ARGUMENT_NONE ,
. argument_description = NULL ,
. command_handler = & command_bootloader ,
} ,
} ;
static void command_help ( void * argument )
{
( void ) argument ; // we won't use the argument
printf ( " available commands: \n " ) ;
menu_print_commands ( menu_commands , LENGTH ( menu_commands ) ) ; // print global commands
}
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/** process user command
* @ param [ in ] str user command string ( \ 0 ended )
*/
static void process_command ( char * str )
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{
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// ensure actions are available
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if ( NULL = = menu_commands | | 0 = = LENGTH ( menu_commands ) ) {
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return ;
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}
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// don't handle empty lines
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if ( ! str | | 0 = = strlen ( str ) ) {
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return ;
}
bool command_handled = false ;
if ( ! command_handled ) {
command_handled = menu_handle_command ( str , menu_commands , LENGTH ( menu_commands ) ) ; // try if this is not a global command
}
if ( ! command_handled ) {
printf ( " command not recognized. enter help to list commands \n " ) ;
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}
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}
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/** program entry point
* this is the firmware function started by the micro - controller
*/
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void main ( void ) ;
void main ( void )
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{
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# if DEBUG
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// enable functionalities for easier debug
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DBGMCU_CR | = DBGMCU_CR_IWDG_STOP ; // stop independent watchdog counter when code is halted
DBGMCU_CR | = DBGMCU_CR_WWDG_STOP ; // stop window watchdog counter when code is halted
DBGMCU_CR | = DBGMCU_CR_STANDBY ; // allow debug also in standby mode (keep digital part and clock powered)
DBGMCU_CR | = DBGMCU_CR_STOP ; // allow debug also in stop mode (keep clock powered)
DBGMCU_CR | = DBGMCU_CR_SLEEP ; // allow debug also in sleep mode (keep clock powered)
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# else
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// setup watchdog to reset in case we get stuck (i.e. when an error occurred)
iwdg_set_period_ms ( WATCHDOG_PERIOD ) ; // set independent watchdog period
iwdg_start ( ) ; // start independent watchdog
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# endif
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board_setup ( ) ; // setup board
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uart_setup ( ) ; // setup USART (for printing)
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usb_cdcacm_setup ( ) ; // setup USB CDC ACM (for printing)
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puts ( " \n welcome to the CuVoodoo I/O finder \n " ) ; // print welcome message
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# if DEBUG
// show reset cause
if ( RCC_CSR & ( RCC_CSR_LPWRRSTF | RCC_CSR_WWDGRSTF | RCC_CSR_IWDGRSTF | RCC_CSR_SFTRSTF | RCC_CSR_PORRSTF | RCC_CSR_PINRSTF ) ) {
puts ( " reset cause(s): " ) ;
if ( RCC_CSR & RCC_CSR_LPWRRSTF ) {
puts ( " low-power " ) ;
}
if ( RCC_CSR & RCC_CSR_WWDGRSTF ) {
puts ( " window-watchdog " ) ;
}
if ( RCC_CSR & RCC_CSR_IWDGRSTF ) {
puts ( " independent-watchdog " ) ;
}
if ( RCC_CSR & RCC_CSR_SFTRSTF ) {
puts ( " software " ) ;
}
if ( RCC_CSR & RCC_CSR_PORRSTF ) {
puts ( " POR/PDR " ) ;
}
if ( RCC_CSR & RCC_CSR_PINRSTF ) {
puts ( " pin " ) ;
}
putc ( ' \n ' ) ;
RCC_CSR | = RCC_CSR_RMVF ; // clear reset flags
}
# endif
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# if !(DEBUG)
// show watchdog information
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printf ( " setup watchdog: %.2fs " , WATCHDOG_PERIOD / 1000.0 ) ;
if ( FLASH_OBR & FLASH_OBR_OPTERR ) {
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puts ( " (option bytes not set in flash: software watchdog used, not automatically started at reset) \n " ) ;
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} else if ( FLASH_OBR & FLASH_OBR_WDG_SW ) {
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puts ( " (software watchdog used, not automatically started at reset) \n " ) ;
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} else {
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puts ( " (hardware watchdog used, automatically started at reset) \n " ) ;
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}
# endif
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// setup RTC
puts ( " setup RTC: " ) ;
rcc_periph_clock_enable ( RCC_RTC ) ; // enable clock for RTC peripheral
if ( ! ( RCC_BDCR & & RCC_BDCR_RTCEN ) ) { // the RTC has not been configured yet
pwr_disable_backup_domain_write_protect ( ) ; // disable backup protection so we can set the RTC clock source
rtc_unlock ( ) ; // enable writing RTC registers
# if defined(MINIF401)
rcc_osc_on ( RCC_LSE ) ; // enable LSE clock
while ( ! rcc_is_osc_ready ( RCC_LSE ) ) ; // wait until clock is ready
rtc_set_prescaler ( 256 , 128 ) ; // set clock prescaler to 32768
RCC_BDCR = ( RCC_BDCR & ~ ( RCC_BDCR_RTCSEL_MASK < < RCC_BDCR_RTCSEL_SHIFT ) ) | ( RCC_BDCR_RTCSEL_LSE < < RCC_BDCR_RTCSEL_SHIFT ) ; // select LSE as RTC clock source
# else
rcc_osc_on ( RCC_LSI ) ; // enable LSI clock
while ( ! rcc_is_osc_ready ( RCC_LSI ) ) ; // wait until clock is ready
rtc_set_prescaler ( 250 , 128 ) ; // set clock prescaler to 32000
RCC_BDCR = ( RCC_BDCR & ~ ( RCC_BDCR_RTCSEL_MASK < < RCC_BDCR_RTCSEL_SHIFT ) ) | ( RCC_BDCR_RTCSEL_LSI < < RCC_BDCR_RTCSEL_SHIFT ) ; // select LSI as RTC clock source
# endif
RCC_BDCR | = RCC_BDCR_RTCEN ; // enable RTC
rtc_lock ( ) ; // protect RTC register against writing
pwr_enable_backup_domain_write_protect ( ) ; // re-enable protection now that we configured the RTC clock
}
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boot_time = rtc_to_seconds ( ) ; // remember the start time
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puts ( " OK \n " ) ;
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// setup wakeup timer for periodic checks
puts ( " setup wakeup: " ) ;
// RTC needs to be configured beforehand
pwr_disable_backup_domain_write_protect ( ) ; // disable backup protection so we can write to the RTC registers
rtc_unlock ( ) ; // enable writing RTC registers
rtc_clear_wakeup_flag ( ) ; // clear flag for fresh start
# if defined(MINIF401)
rtc_set_wakeup_time ( ( 32768 / 2 ) / WAKEUP_FREQ - 1 , RTC_CR_WUCLKSEL_RTC_DIV2 ) ; // set wakeup time based on LSE (keep highest precision, also enables the wakeup timer)
# else
rtc_set_wakeup_time ( ( 32000 / 2 ) / WAKEUP_FREQ - 1 , RTC_CR_WUCLKSEL_RTC_DIV2 ) ; // set wakeup time based on LSI (keep highest precision, also enables the wakeup timer)
# endif
rtc_enable_wakeup_timer_interrupt ( ) ; // enable interrupt
rtc_lock ( ) ; // disable writing RTC registers
// important: do not re-enable backup_domain_write_protect, since this will prevent clearing flags (but RTC registers do not need to be unlocked)
puts ( " OK \n " ) ;
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// setup terminal
terminal_prefix = " " ; // set default prefix
terminal_process = & process_command ; // set central function to process commands
terminal_setup ( ) ; // start terminal
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// start main loop
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bool action = false ; // if an action has been performed don't go to sleep
button_flag = false ; // reset button flag
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led_on ( ) ; // switch LED to indicate booting completed
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while ( true ) { // infinite loop
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iwdg_reset ( ) ; // kick the dog
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if ( user_input_available ) { // user input is available
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action = true ; // action has been performed
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led_toggle ( ) ; // toggle LED
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char c = user_input_get ( ) ; // store receive character
terminal_send ( c ) ; // send received character to terminal
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}
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if ( button_flag ) { // user pressed button
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action = true ; // action has been performed
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puts ( " button pressed \n " ) ;
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led_toggle ( ) ; // toggle LED
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sleep_ms ( 100 ) ; // wait a bit to remove noise and double trigger
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button_flag = false ; // reset flag
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}
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if ( wakeup_flag ) { // time to do periodic checks
wakeup_flag = false ; // clear flag
}
if ( second_flag ) { // one second passed
second_flag = false ; // clear flag
led_toggle ( ) ; // toggle LED to indicate if main function is stuck
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}
if ( action ) { // go to sleep if nothing had to be done, else recheck for activity
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action = false ;
} else {
__WFI ( ) ; // go to sleep
}
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} // main loop
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}
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/** interrupt service routine when the wakeup timer triggered */
void rtc_wkup_isr ( void )
{
static uint16_t tick = WAKEUP_FREQ ; // how many wakeup have occurred
exti_reset_request ( EXTI22 ) ; // clear EXTI flag used by wakeup
rtc_clear_wakeup_flag ( ) ; // clear flag
wakeup_flag = true ; // notify main loop
tick - - ; // count the number of ticks down (do it in the ISR to no miss any tick)
if ( 0 = = tick ) { // count down completed
second_flag = true ; // notify main loop a second has passed
tick = WAKEUP_FREQ ; // restart count down
}
}