void SDI12Timer::configSDI12TimerPrescale(void)
{
// Select generic clock generator 4 (Arduino core uses 0-3)
// Most examples use this clock generator.. consider yourself warned!
// I would use a higher clock number, but some of the cores don't include them for some reason
REG_GCLK_GENDIV = GCLK_GENDIV_ID(4) | // Select Generic Clock Generator 4
GCLK_GENDIV_DIV(3) ; // Divide the 48MHz clock source by divisor 3: 48MHz/3=16MHz
while (GCLK->STATUS.bit.SYNCBUSY); // Wait for synchronization
// Write the generic clock generator 5 configuration
REG_GCLK_GENCTRL = GCLK_GENCTRL_ID(4) | // Select GCLK4
GCLK_GENCTRL_SRC_DFLL48M | // Set the 48MHz clock source
GCLK_GENCTRL_IDC | // Set the duty cycle to 50/50 HIGH/LOW
GCLK_GENCTRL_GENEN; // Enable the generic clock clontrol
while (GCLK->STATUS.bit.SYNCBUSY); // Wait for synchronization
// Feed GCLK4 to TC4 (also feeds to TC5, the two must have the same source)
REG_GCLK_CLKCTRL = GCLK_CLKCTRL_GEN_GCLK4 | // Select Generic Clock Generator 4
GCLK_CLKCTRL_CLKEN | // Enable the generic clock generator
GCLK_CLKCTRL_ID_TC4_TC5; // Feed the Generic Clock Generator 4 to TC4 and TC5
while (GCLK->STATUS.bit.SYNCBUSY); // Wait for synchronization
REG_TC4_CTRLA |= TC_CTRLA_PRESCALER_DIV1024 | // Set prescaler to 1024, 16MHz/1024 = 15.625kHz
TC_CTRLA_WAVEGEN_NFRQ | // Put the timer TC4 into normal frequency (NFRQ) mode
TC_CTRLA_MODE_COUNT8 | // Put the timer TC4 into 8-bit mode
TC_CTRLA_ENABLE; // Enable TC4
while (TC4->COUNT16.STATUS.bit.SYNCBUSY); // Wait for synchronization
}
void RtcInit() {
// SYSCTRL->XOSC32K.reg = SYSCTRL_XOSC32K_ENABLE | SYSCTRL_XOSC32K_EN32K;
// //wait for crystal to warm up
// while((SYSCTRL->PCLKSR.reg & (SYSCTRL_PCLKSR_XOSC32KRDY)) == 0);
GCLK->GENDIV.reg = GCLK_GENDIV_ID(2) |
GCLK_GENDIV_DIV(8);
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID(2) |
GCLK_GENCTRL_SRC(GCLK_SOURCE_OSC8M) |
GCLK_GENCTRL_IDC |
GCLK_GENCTRL_RUNSTDBY |
GCLK_GENCTRL_GENEN;
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
// Configure RTC
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID(RTC_GCLK_ID) |
GCLK_CLKCTRL_CLKEN |
GCLK_CLKCTRL_GEN(2);
RTC->MODE1.CTRL.reg = RTC_MODE1_CTRL_MODE_COUNT16;
while (RTC->MODE1.STATUS.bit.SYNCBUSY);
// Prescaler needs to be enabled separately from the mode for some reason
RTC->MODE1.CTRL.reg |= RTC_MODE1_CTRL_PRESCALER_DIV1;
while (RTC->MODE1.STATUS.bit.SYNCBUSY);
RTC->MODE1.PER.reg = 998;
while (RTC->MODE1.STATUS.bit.SYNCBUSY);
RTC->MODE1.READREQ.reg |= RTC_READREQ_RCONT | RTC_READREQ_ADDR(0x10);
RTC->MODE1.INTENSET.reg = RTC_MODE1_INTENSET_OVF;
RTC->MODE1.CTRL.bit.ENABLE = 1;
while (RTC->MODE1.STATUS.bit.SYNCBUSY);
NVIC_EnableIRQ(RTC_IRQn);
}
void
SystemInit(void)
{
// Setup flash to work with 48Mhz clock
NVMCTRL->CTRLB.reg = NVMCTRL_CTRLB_RWS_HALF;
// Enable external 32Khz crystal
uint32_t val = (SYSCTRL_XOSC32K_STARTUP(6)
| SYSCTRL_XOSC32K_XTALEN | SYSCTRL_XOSC32K_EN32K);
SYSCTRL->XOSC32K.reg = val;
SYSCTRL->XOSC32K.reg = val | SYSCTRL_XOSC32K_ENABLE;
while (!(SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_XOSC32KRDY))
;
// Reset GCLK
GCLK->CTRL.reg = GCLK_CTRL_SWRST;
while (GCLK->CTRL.reg & GCLK_CTRL_SWRST)
;
// Route 32Khz clock to DFLL48M
GCLK->GENDIV.reg = GCLK_GENDIV_ID(CLK_32K);
GCLK->GENCTRL.reg = (GCLK_GENCTRL_ID(CLK_32K)
| GCLK_GENCTRL_SRC_XOSC32K | GCLK_GENCTRL_GENEN);
GCLK->CLKCTRL.reg = (GCLK_CLKCTRL_ID(MCLK_DFLL48M)
| GCLK_CLKCTRL_GEN(CLK_32K) | GCLK_CLKCTRL_CLKEN);
// Configure DFLL48M clock
SYSCTRL->DFLLCTRL.reg = 0;
uint32_t mul = DIV_ROUND_CLOSEST(CONFIG_CLOCK_FREQ, CLK_32K_FREQ);
SYSCTRL->DFLLMUL.reg = (SYSCTRL_DFLLMUL_CSTEP(31)
| SYSCTRL_DFLLMUL_FSTEP(511)
| SYSCTRL_DFLLMUL_MUL(mul));
SYSCTRL->DFLLCTRL.reg = (SYSCTRL_DFLLCTRL_MODE | SYSCTRL_DFLLCTRL_WAITLOCK
| SYSCTRL_DFLLCTRL_QLDIS
| SYSCTRL_DFLLCTRL_ENABLE);
uint32_t ready = (SYSCTRL_PCLKSR_DFLLRDY | SYSCTRL_PCLKSR_DFLLLCKC
| SYSCTRL_PCLKSR_DFLLLCKF);
while ((SYSCTRL->PCLKSR.reg & ready) != ready)
;
// Switch main clock to DFLL48M clock
GCLK->GENDIV.reg = GCLK_GENDIV_ID(CLK_MAIN);
GCLK->GENCTRL.reg = (GCLK_GENCTRL_ID(CLK_MAIN)
| GCLK_GENCTRL_SRC_DFLL48M
| GCLK_GENCTRL_IDC | GCLK_GENCTRL_GENEN);
}
/**
* @brief Initialize RTT module
*
* The RTT is running at 32768 Hz by default, i.e. @ XOSC32K frequency without
* divider. There are 2 cascaded dividers in the clock path:
*
* - GCLK_GENDIV_DIV(n): between 1 and 31
* - RTC_MODE0_CTRL_PRESCALER_DIVn: between 1 and 1024, see defines in `component_rtc.h`
*
* However the division scheme of GCLK_GENDIV_DIV can be changed by setting
* GCLK_GENCTRL_DIVSEL:
*
* - GCLK_GENCTRL_DIVSEL = 0: Clock divided by GENDIV.DIV (default)
* - GCLK_GENCTRL_DIVSEL = 1: Clock divided by 2^( GENDIV.DIV + 1 )
*/
void rtt_init(void)
{
RtcMode0 *rtcMode0 = &(RTT_DEV);
/* Turn on power manager for RTC */
PM->APBAMASK.reg |= PM_APBAMASK_RTC;
/* RTC uses External 32,768KHz Oscillator because OSC32K isn't accurate
* enough (p1075/1138). Also keep running in standby. */
SYSCTRL->XOSC32K.reg = SYSCTRL_XOSC32K_ONDEMAND |
SYSCTRL_XOSC32K_EN32K |
SYSCTRL_XOSC32K_XTALEN |
SYSCTRL_XOSC32K_STARTUP(6) |
#if RTT_RUNSTDBY
SYSCTRL_XOSC32K_RUNSTDBY |
#endif
SYSCTRL_XOSC32K_ENABLE;
/* Setup clock GCLK2 with divider 1 */
GCLK->GENDIV.reg = GCLK_GENDIV_ID(2) | GCLK_GENDIV_DIV(1);
while (GCLK->STATUS.bit.SYNCBUSY) {}
/* Enable GCLK2 with XOSC32K as source. Use divider without modification
* and keep running in standby. */
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID(2) |
GCLK_GENCTRL_GENEN |
#if RTT_RUNSTDBY
GCLK_GENCTRL_RUNSTDBY |
#endif
GCLK_GENCTRL_SRC_XOSC32K;
while (GCLK->STATUS.bit.SYNCBUSY) {}
/* Connect GCLK2 to RTC */
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_GEN_GCLK2 |
GCLK_CLKCTRL_CLKEN |
GCLK_CLKCTRL_ID(RTC_GCLK_ID);
while (GCLK->STATUS.bit.SYNCBUSY) {}
/* Disable RTC */
rtt_poweroff();
/* Reset RTC */
rtcMode0->CTRL.bit.SWRST = 1;
while (rtcMode0->STATUS.bit.SYNCBUSY || rtcMode0->CTRL.bit.SWRST) {}
/* Configure as 32bit counter with no prescaler and no clear on match compare */
rtcMode0->CTRL.reg = RTC_MODE0_CTRL_MODE_COUNT32 |
RTT_PRESCALER;
while (rtcMode0->STATUS.bit.SYNCBUSY) {}
/* Setup interrupt */
NVIC_EnableIRQ(RTT_IRQ);
/* Enable RTC */
rtt_poweron();
}
/*******************************************************************************************
*Description: Function responsible of RTC initialization
*Input Parameters: bool timeRep this parameter can be TIME_H24 (24 hour mode) or TIME_H12 (12 hour mode)
*Return Parameter: None
*******************************************************************************************/
void RTCInt::begin(bool timeRep, int oscillatorType)
{
PM->APBAMASK.reg |= PM_APBAMASK_RTC; // turn on digital interface clock for RTC
GCLK->CLKCTRL.reg = (uint32_t)((GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK4 | (RTC_GCLK_ID << GCLK_CLKCTRL_ID_Pos)));
while (GCLK->STATUS.bit.SYNCBUSY);
//Set the oscillator to use - M0 only
if(oscillatorType==HIGH_PRECISION)
//External oscillator
GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_XOSC32K | GCLK_GENCTRL_ID(4) | GCLK_GENCTRL_DIVSEL );
else
//Internal low power oscillator (default configuration)
GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_OSCULP32K | GCLK_GENCTRL_ID(4) | GCLK_GENCTRL_DIVSEL );
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
GCLK->GENDIV.reg = GCLK_GENDIV_ID(4);
GCLK->GENDIV.bit.DIV=4;
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
RTCdisable();
RTCreset();
RTC->MODE2.CTRL.reg |= RTC_MODE2_CTRL_MODE_CLOCK; // set RTC operating mode
RTC->MODE2.CTRL.reg |= RTC_MODE2_CTRL_PRESCALER_DIV1024; // set prescaler to 1024 for MODE2
RTC->MODE2.CTRL.bit.MATCHCLR = 0; // disable clear on match
if (timeRep)
{
RTC->MODE2.CTRL.bit.CLKREP = 0; // 24h time representation
time_Mode = true;
}
else
{
RTC->MODE2.CTRL.bit.CLKREP = 1; // 12h time representation
time_Mode = false;
}
RTC->MODE2.READREQ.reg &= ~RTC_READREQ_RCONT; // disable continuously mode
while (RTCSync());
RTCresetRemove();
RTCenable();
}
void WatchdogSAMD::_initialize_wdt() {
// One-time initialization of watchdog timer.
// Insights from rickrlh and rbrucemtl in Arduino forum!
#if defined(__SAMD51__)
// SAMD51 WDT uses OSCULP32k as input clock now
// section: 20.5.3
OSC32KCTRL->OSCULP32K.bit.EN1K = 1; // Enable out 1K (for WDT)
OSC32KCTRL->OSCULP32K.bit.EN32K = 0; // Disable out 32K
// Enable WDT early-warning interrupt
NVIC_DisableIRQ(WDT_IRQn);
NVIC_ClearPendingIRQ(WDT_IRQn);
NVIC_SetPriority(WDT_IRQn, 0); // Top priority
NVIC_EnableIRQ(WDT_IRQn);
while(WDT->SYNCBUSY.reg);
USB->DEVICE.CTRLA.bit.ENABLE = 0; // Disable the USB peripheral
while(USB->DEVICE.SYNCBUSY.bit.ENABLE); // Wait for synchronization
USB->DEVICE.CTRLA.bit.RUNSTDBY = 0; // Deactivate run on standby
USB->DEVICE.CTRLA.bit.ENABLE = 1; // Enable the USB peripheral
while(USB->DEVICE.SYNCBUSY.bit.ENABLE); // Wait for synchronization
#else
// Generic clock generator 2, divisor = 32 (2^(DIV+1))
GCLK->GENDIV.reg = GCLK_GENDIV_ID(2) | GCLK_GENDIV_DIV(4);
// Enable clock generator 2 using low-power 32KHz oscillator.
// With /32 divisor above, this yields 1024Hz(ish) clock.
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID(2) |
GCLK_GENCTRL_GENEN |
GCLK_GENCTRL_SRC_OSCULP32K |
GCLK_GENCTRL_DIVSEL;
while(GCLK->STATUS.bit.SYNCBUSY);
// WDT clock = clock gen 2
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID_WDT |
GCLK_CLKCTRL_CLKEN |
GCLK_CLKCTRL_GEN_GCLK2;
// Enable WDT early-warning interrupt
NVIC_DisableIRQ(WDT_IRQn);
NVIC_ClearPendingIRQ(WDT_IRQn);
NVIC_SetPriority(WDT_IRQn, 0); // Top priority
NVIC_EnableIRQ(WDT_IRQn);
#endif
_initialized = true;
}
void SaLBuzzerInit() {
pinOut(BUZZER);
pinCfg(BUZZER);
//
PM->APBCMASK.reg |= PM_APBCMASK_TC5;
//
GCLK->GENDIV.reg = GCLK_GENDIV_ID(5) |
GCLK_GENDIV_DIV(1);
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID(5) |
GCLK_GENCTRL_SRC_OSC8M |
GCLK_GENCTRL_GENEN;
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_GEN(0) |
GCLK_CLKCTRL_CLKEN |
GCLK_CLKCTRL_ID(TC5_GCLK_ID);
TC5->COUNT16.CTRLA.reg = TC_CTRLA_MODE_COUNT16|
TC_CTRLA_RUNSTDBY |
// TC_CTRLA_PRESCSYNC_GCLK |
TC_CTRLA_PRESCALER_DIV4;
// TC5->COUNT16.EVCTRL.bit.EVACT = 0x1;
TC5->COUNT16.CC[0].bit.CC = 700;
//TC5->COUNT16.PER.reg = 0x02;
TC5->COUNT16.INTENSET.reg = TC_INTENSET_MC0;
TC5->COUNT16.CTRLA.reg |= TC_CTRLA_ENABLE;
TC5->COUNT16.EVCTRL.bit.EVACT = 0x1;
NVIC_EnableIRQ(TC5_IRQn);
NVIC_SetPriority(TC5_IRQn,0xFFF);
TC5->COUNT16.CTRLBSET.reg = TC_CTRLBSET_CMD_STOP;
}
void rtc_init(void)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
/* Turn on power manager for RTC */
PM->APBAMASK.reg |= PM_APBAMASK_RTC;
SYSCTRL->OSC32K.bit.ENABLE = 0;
SYSCTRL->OSC32K.bit.ONDEMAND = 1;
SYSCTRL->OSC32K.bit.RUNSTDBY = 0;
SYSCTRL->OSC32K.bit.EN1K = 1;
SYSCTRL->OSC32K.bit.EN32K = 1;
SYSCTRL->OSC32K.bit.ENABLE = 1;
/* Setup clock GCLK2 with OSC32K divided by 32 */
GCLK->GENDIV.reg = GCLK_GENDIV_ID(2)|GCLK_GENDIV_DIV(4);
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_OSC32K | GCLK_GENCTRL_ID(2) | GCLK_GENCTRL_DIVSEL );
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
GCLK->CLKCTRL.reg = (uint32_t)((GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK2 | (RTC_GCLK_ID << GCLK_CLKCTRL_ID_Pos)));
while (GCLK->STATUS.bit.SYNCBUSY);
/* DISABLE RTC MASTER */
while (rtcMode2->STATUS.reg & RTC_STATUS_SYNCBUSY);
rtc_poweroff();
/* Reset RTC */
while (rtcMode2->STATUS.bit.SYNCBUSY);
rtcMode2->CTRL.reg= RTC_MODE2_CTRL_SWRST;
while (rtcMode2->STATUS.bit.SYNCBUSY);
/* RTC config with RTC_MODE2_CTRL_CLKREP = 0 (24h) */
rtcMode2->CTRL.reg = RTC_MODE2_CTRL_PRESCALER_DIV1024|RTC_MODE2_CTRL_MODE_CLOCK;
while (rtcMode2->STATUS.bit.SYNCBUSY);
rtcMode2->INTENSET.reg = RTC_MODE2_INTENSET_OVF;
while (rtcMode2->STATUS.bit.SYNCBUSY);
rtc_poweron();
}
void rtc_init(void)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
/* Turn on power manager for RTC */
PM->APBAMASK.reg |= PM_APBAMASK_RTC;
/* RTC uses External 32,768KHz Oscillator (OSC32K isn't accurate enough p1075/1138)*/
SYSCTRL->XOSC32K.reg = SYSCTRL_XOSC32K_ONDEMAND |
SYSCTRL_XOSC32K_EN32K |
SYSCTRL_XOSC32K_XTALEN |
SYSCTRL_XOSC32K_STARTUP(6) |
SYSCTRL_XOSC32K_ENABLE;
/* Setup clock GCLK2 with OSC32K divided by 32 */
GCLK->GENDIV.reg = GCLK_GENDIV_ID(2)|GCLK_GENDIV_DIV(4);
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_XOSC32K | GCLK_GENCTRL_ID(2) | GCLK_GENCTRL_DIVSEL );
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
GCLK->CLKCTRL.reg = (uint32_t)((GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK2 | (RTC_GCLK_ID << GCLK_CLKCTRL_ID_Pos)));
while (GCLK->STATUS.bit.SYNCBUSY);
/* DISABLE RTC MASTER */
while (rtcMode2->STATUS.reg & RTC_STATUS_SYNCBUSY);
rtc_poweroff();
/* Reset RTC */
while (rtcMode2->STATUS.bit.SYNCBUSY);
rtcMode2->CTRL.reg= RTC_MODE2_CTRL_SWRST;
while (rtcMode2->STATUS.bit.SYNCBUSY);
/* RTC config with RTC_MODE2_CTRL_CLKREP = 0 (24h) */
rtcMode2->CTRL.reg = RTC_MODE2_CTRL_PRESCALER_DIV1024|RTC_MODE2_CTRL_MODE_CLOCK;
while (rtcMode2->STATUS.bit.SYNCBUSY);
rtcMode2->INTENSET.reg = RTC_MODE2_INTENSET_OVF;
while (rtcMode2->STATUS.bit.SYNCBUSY);
rtc_poweron();
}
void SystemInit( void )
{
/* Set 1 Flash Wait State for 48MHz, cf tables 20.9 and 35.27 in SAMD21 Datasheet */
NVMCTRL->CTRLB.bit.RWS = NVMCTRL_CTRLB_RWS_HALF_Val ;
/* Turn on the digital interface clock */
PM->APBAMASK.reg |= PM_APBAMASK_GCLK ;
/* ----------------------------------------------------------------------------------------------
* 1) Enable XOSC32K clock (External on-board 32.768Hz oscillator)
*/
SYSCTRL->XOSC32K.reg = SYSCTRL_XOSC32K_STARTUP( 0x6u ) | /* cf table 15.10 of product datasheet in chapter 15.8.6 */
SYSCTRL_XOSC32K_XTALEN | SYSCTRL_XOSC32K_EN32K ;
SYSCTRL->XOSC32K.bit.ENABLE = 1 ; /* separate call, as described in chapter 15.6.3 */
while ( (SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_XOSC32KRDY) == 0 )
{
/* Wait for oscillator stabilization */
}
/* Software reset the module to ensure it is re-initialized correctly */
/* Note: Due to synchronization, there is a delay from writing CTRL.SWRST until the reset is complete.
* CTRL.SWRST and STATUS.SYNCBUSY will both be cleared when the reset is complete, as described in chapter 13.8.1
*/
GCLK->CTRL.reg = GCLK_CTRL_SWRST ;
while ( (GCLK->CTRL.reg & GCLK_CTRL_SWRST) && (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) )
{
/* Wait for reset to complete */
}
/* ----------------------------------------------------------------------------------------------
* 2) Put XOSC32K as source of Generic Clock Generator 1
*/
GCLK->GENDIV.reg = GCLK_GENDIV_ID( GENERIC_CLOCK_GENERATOR_XOSC32K ) ; // Generic Clock Generator 1
while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY )
{
/* Wait for synchronization */
}
/* Write Generic Clock Generator 1 configuration */
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID( GENERIC_CLOCK_GENERATOR_XOSC32K ) | // Generic Clock Generator 1
GCLK_GENCTRL_SRC_XOSC32K | // Selected source is External 32KHz Oscillator
// GCLK_GENCTRL_OE | // Output clock to a pin for tests
GCLK_GENCTRL_GENEN ;
while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY )
{
/* Wait for synchronization */
}
/* ----------------------------------------------------------------------------------------------
* 3) Put Generic Clock Generator 1 as source for Generic Clock Multiplexer 0 (DFLL48M reference)
*/
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID( GENERIC_CLOCK_MULTIPLEXER_DFLL48M ) | // Generic Clock Multiplexer 0
GCLK_CLKCTRL_GEN_GCLK1 | // Generic Clock Generator 1 is source
GCLK_CLKCTRL_CLKEN ;
while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY )
{
/* Wait for synchronization */
}
/* ----------------------------------------------------------------------------------------------
* 4) Enable DFLL48M clock
*/
/* DFLL Configuration in Closed Loop mode, cf product datasheet chapter 15.6.7.1 - Closed-Loop Operation */
/* Remove the OnDemand mode, Bug http://avr32.icgroup.norway.atmel.com/bugzilla/show_bug.cgi?id=9905 */
SYSCTRL->DFLLCTRL.bit.ONDEMAND = 0 ;
while ( (SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_DFLLRDY) == 0 )
{
/* Wait for synchronization */
}
SYSCTRL->DFLLMUL.reg = SYSCTRL_DFLLMUL_CSTEP( 31 ) | // Coarse step is 31, half of the max value
SYSCTRL_DFLLMUL_FSTEP( 511 ) | // Fine step is 511, half of the max value
SYSCTRL_DFLLMUL_MUL( (__CLOCK_48MHz/__CLOCK_32KHz) ) ; // External 32KHz is the reference
while ( (SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_DFLLRDY) == 0 )
{
/* Wait for synchronization */
}
/* Write full configuration to DFLL control register */
SYSCTRL->DFLLCTRL.reg |= SYSCTRL_DFLLCTRL_MODE | /* Enable the closed loop mode */
SYSCTRL_DFLLCTRL_WAITLOCK |
SYSCTRL_DFLLCTRL_QLDIS ; /* Disable Quick lock */
while ( (SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_DFLLRDY) == 0 )
{
/* Wait for synchronization */
}
/* Enable the DFLL */
SYSCTRL->DFLLCTRL.reg |= SYSCTRL_DFLLCTRL_ENABLE ;
while ( (SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_DFLLLCKC) == 0 ||
(SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_DFLLLCKF) == 0 )
{
/* Wait for locks flags */
}
while ( (SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_DFLLRDY) == 0 )
{
/* Wait for synchronization */
}
/* ----------------------------------------------------------------------------------------------
* 5) Switch Generic Clock Generator 0 to DFLL48M. CPU will run at 48MHz.
*/
GCLK->GENDIV.reg = GCLK_GENDIV_ID( GENERIC_CLOCK_GENERATOR_MAIN ) ; // Generic Clock Generator 0
while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY )
{
/* Wait for synchronization */
}
/* Write Generic Clock Generator 0 configuration */
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID( GENERIC_CLOCK_GENERATOR_MAIN ) | // Generic Clock Generator 0
GCLK_GENCTRL_SRC_DFLL48M | // Selected source is DFLL 48MHz
// GCLK_GENCTRL_OE | // Output clock to a pin for tests
GCLK_GENCTRL_IDC | // Set 50/50 duty cycle
GCLK_GENCTRL_GENEN ;
while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY )
{
/* Wait for synchronization */
}
/* ----------------------------------------------------------------------------------------------
* 6) Modify PRESCaler value of OSC8M to have 8MHz
*/
SYSCTRL->OSC8M.bit.PRESC = SYSCTRL_OSC8M_PRESC_0_Val ;
SYSCTRL->OSC8M.bit.ONDEMAND = 0 ;
/* ----------------------------------------------------------------------------------------------
* 7) Put OSC8M as source for Generic Clock Generator 3
*/
GCLK->GENDIV.reg = GCLK_GENDIV_ID( GENERIC_CLOCK_GENERATOR_OSC8M ) ; // Generic Clock Generator 3
/* Write Generic Clock Generator 3 configuration */
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID( GENERIC_CLOCK_GENERATOR_OSC8M ) | // Generic Clock Generator 3
GCLK_GENCTRL_SRC_OSC8M | // Selected source is RC OSC 8MHz (already enabled at reset)
// GCLK_GENCTRL_OE | // Output clock to a pin for tests
GCLK_GENCTRL_GENEN ;
while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY )
{
/* Wait for synchronization */
}
/* ----------------------------------------------------------------------------------------------
* 8) Put OSC8M as source for Generic Clock Generator 2, with freq/8
*/
GCLK->GENDIV.reg = GCLK_GENDIV_ID( GENERIC_CLOCK_GENERATOR_OSC1M ) | 8 << 8; // Generic Clock Generator 4
/* Write Generic Clock Generator 3 configuration */
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID( GENERIC_CLOCK_GENERATOR_OSC1M ) | // Generic Clock Generator 4
GCLK_GENCTRL_SRC_OSC8M | // Selected source is RC OSC 8MHz (already enabled at reset)
// GCLK_GENCTRL_OE | // Output clock to a pin for tests
GCLK_GENCTRL_GENEN ;
while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY )
{
/* Wait for synchronization */
}
/*
* Now that all system clocks are configured, we can set CPU and APBx BUS clocks.
* There values are normally the one present after Reset.
*/
PM->CPUSEL.reg = PM_CPUSEL_CPUDIV_DIV1 ;
PM->APBASEL.reg = PM_APBASEL_APBADIV_DIV1_Val ;
PM->APBBSEL.reg = PM_APBBSEL_APBBDIV_DIV1_Val ;
PM->APBCSEL.reg = PM_APBCSEL_APBCDIV_DIV1_Val ;
SystemCoreClock=__CLOCK_48MHz ;
return;
}
/**
* \brief Initializes generators
*/
void _gclk_init_generators(void)
{
void *hw = (void *)GCLK;
# if CONF_GCLK_GEN_0_GENEN == 1
hri_gclk_write_GENDIV_reg(hw, GCLK_GENDIV_DIV(CONF_GCLK_GEN_0_DIV) |
GCLK_GENDIV_ID(0));
hri_gclk_write_GENCTRL_reg(hw,
(CONF_GCLK_GEN_0_RUNSTDBY << GCLK_GENCTRL_RUNSTDBY_Pos) |
(CONF_GCLK_GEN_0_DIVSEL << GCLK_GENCTRL_DIVSEL_Pos) |
(CONF_GCLK_GEN_0_OE << GCLK_GENCTRL_OE_Pos) |
(CONF_GCLK_GEN_0_OOV << GCLK_GENCTRL_OOV_Pos) |
(CONF_GCLK_GEN_0_IDC << GCLK_GENCTRL_IDC_Pos) |
(CONF_GCLK_GEN_0_GENEN << GCLK_GENCTRL_GENEN_Pos) |
CONF_GCLK_GEN_0_SRC |
GCLK_GENCTRL_ID(0));
# endif
# if CONF_GCLK_GEN_1_GENEN == 1
hri_gclk_write_GENDIV_reg(hw, GCLK_GENDIV_DIV(CONF_GCLK_GEN_1_DIV) |
GCLK_GENDIV_ID(1));
hri_gclk_write_GENCTRL_reg(hw,
(CONF_GCLK_GEN_1_RUNSTDBY << GCLK_GENCTRL_RUNSTDBY_Pos) |
(CONF_GCLK_GEN_1_DIVSEL << GCLK_GENCTRL_DIVSEL_Pos) |
(CONF_GCLK_GEN_1_OE << GCLK_GENCTRL_OE_Pos) |
(CONF_GCLK_GEN_1_OOV << GCLK_GENCTRL_OOV_Pos) |
(CONF_GCLK_GEN_1_IDC << GCLK_GENCTRL_IDC_Pos) |
(CONF_GCLK_GEN_1_GENEN << GCLK_GENCTRL_GENEN_Pos) |
CONF_GCLK_GEN_1_SRC |
GCLK_GENCTRL_ID(1));
# endif
# if CONF_GCLK_GEN_2_GENEN == 1
hri_gclk_write_GENDIV_reg(hw, GCLK_GENDIV_DIV(CONF_GCLK_GEN_2_DIV) |
GCLK_GENDIV_ID(2));
hri_gclk_write_GENCTRL_reg(hw,
(CONF_GCLK_GEN_2_RUNSTDBY << GCLK_GENCTRL_RUNSTDBY_Pos) |
(CONF_GCLK_GEN_2_DIVSEL << GCLK_GENCTRL_DIVSEL_Pos) |
(CONF_GCLK_GEN_2_OE << GCLK_GENCTRL_OE_Pos) |
(CONF_GCLK_GEN_2_OOV << GCLK_GENCTRL_OOV_Pos) |
(CONF_GCLK_GEN_2_IDC << GCLK_GENCTRL_IDC_Pos) |
(CONF_GCLK_GEN_2_GENEN << GCLK_GENCTRL_GENEN_Pos) |
CONF_GCLK_GEN_2_SRC |
GCLK_GENCTRL_ID(2));
# endif
# if CONF_GCLK_GEN_3_GENEN == 1
hri_gclk_write_GENDIV_reg(hw, GCLK_GENDIV_DIV(CONF_GCLK_GEN_3_DIV) |
GCLK_GENDIV_ID(3));
hri_gclk_write_GENCTRL_reg(hw,
(CONF_GCLK_GEN_3_RUNSTDBY << GCLK_GENCTRL_RUNSTDBY_Pos) |
(CONF_GCLK_GEN_3_DIVSEL << GCLK_GENCTRL_DIVSEL_Pos) |
(CONF_GCLK_GEN_3_OE << GCLK_GENCTRL_OE_Pos) |
(CONF_GCLK_GEN_3_OOV << GCLK_GENCTRL_OOV_Pos) |
(CONF_GCLK_GEN_3_IDC << GCLK_GENCTRL_IDC_Pos) |
(CONF_GCLK_GEN_3_GENEN << GCLK_GENCTRL_GENEN_Pos) |
CONF_GCLK_GEN_3_SRC |
GCLK_GENCTRL_ID(3));
# endif
# if CONF_GCLK_GEN_4_GENEN == 1
hri_gclk_write_GENDIV_reg(hw, GCLK_GENDIV_DIV(CONF_GCLK_GEN_4_DIV) |
GCLK_GENDIV_ID(4));
hri_gclk_write_GENCTRL_reg(hw,
(CONF_GCLK_GEN_4_RUNSTDBY << GCLK_GENCTRL_RUNSTDBY_Pos) |
(CONF_GCLK_GEN_4_DIVSEL << GCLK_GENCTRL_DIVSEL_Pos) |
(CONF_GCLK_GEN_4_OE << GCLK_GENCTRL_OE_Pos) |
(CONF_GCLK_GEN_4_OOV << GCLK_GENCTRL_OOV_Pos) |
(CONF_GCLK_GEN_4_IDC << GCLK_GENCTRL_IDC_Pos) |
(CONF_GCLK_GEN_4_GENEN << GCLK_GENCTRL_GENEN_Pos) |
CONF_GCLK_GEN_4_SRC |
GCLK_GENCTRL_ID(4));
# endif
# if CONF_GCLK_GEN_5_GENEN == 1
hri_gclk_write_GENDIV_reg(hw, GCLK_GENDIV_DIV(CONF_GCLK_GEN_5_DIV) |
GCLK_GENDIV_ID(5));
hri_gclk_write_GENCTRL_reg(hw,
(CONF_GCLK_GEN_5_RUNSTDBY << GCLK_GENCTRL_RUNSTDBY_Pos) |
(CONF_GCLK_GEN_5_DIVSEL << GCLK_GENCTRL_DIVSEL_Pos) |
(CONF_GCLK_GEN_5_OE << GCLK_GENCTRL_OE_Pos) |
(CONF_GCLK_GEN_5_OOV << GCLK_GENCTRL_OOV_Pos) |
(CONF_GCLK_GEN_5_IDC << GCLK_GENCTRL_IDC_Pos) |
(CONF_GCLK_GEN_5_GENEN << GCLK_GENCTRL_GENEN_Pos) |
CONF_GCLK_GEN_5_SRC |
GCLK_GENCTRL_ID(5));
# endif
# if CONF_GCLK_GEN_6_GENEN == 1
hri_gclk_write_GENDIV_reg(hw, GCLK_GENDIV_DIV(CONF_GCLK_GEN_6_DIV) |
GCLK_GENDIV_ID(6));
hri_gclk_write_GENCTRL_reg(hw,
(CONF_GCLK_GEN_6_RUNSTDBY << GCLK_GENCTRL_RUNSTDBY_Pos) |
(CONF_GCLK_GEN_6_DIVSEL << GCLK_GENCTRL_DIVSEL_Pos) |
(CONF_GCLK_GEN_6_OE << GCLK_GENCTRL_OE_Pos) |
(CONF_GCLK_GEN_6_OOV << GCLK_GENCTRL_OOV_Pos) |
(CONF_GCLK_GEN_6_IDC << GCLK_GENCTRL_IDC_Pos) |
(CONF_GCLK_GEN_6_GENEN << GCLK_GENCTRL_GENEN_Pos) |
CONF_GCLK_GEN_6_SRC |
GCLK_GENCTRL_ID(6));
# endif
# if CONF_GCLK_GEN_7_GENEN == 1
hri_gclk_write_GENDIV_reg(hw, GCLK_GENDIV_DIV(CONF_GCLK_GEN_7_DIV) |
GCLK_GENDIV_ID(7));
hri_gclk_write_GENCTRL_reg(hw,
(CONF_GCLK_GEN_7_RUNSTDBY << GCLK_GENCTRL_RUNSTDBY_Pos) |
(CONF_GCLK_GEN_7_DIVSEL << GCLK_GENCTRL_DIVSEL_Pos) |
(CONF_GCLK_GEN_7_OE << GCLK_GENCTRL_OE_Pos) |
(CONF_GCLK_GEN_7_OOV << GCLK_GENCTRL_OOV_Pos) |
(CONF_GCLK_GEN_7_IDC << GCLK_GENCTRL_IDC_Pos) |
(CONF_GCLK_GEN_7_GENEN << GCLK_GENCTRL_GENEN_Pos) |
CONF_GCLK_GEN_7_SRC |
GCLK_GENCTRL_ID(7));
# endif
}
/**
* @brief Configure clock sources and the cpu frequency
*/
static void clk_init(void)
{
/* enable clocks for the power, sysctrl and gclk modules */
PM->APBAMASK.reg = (PM_APBAMASK_PM | PM_APBAMASK_SYSCTRL |
PM_APBAMASK_GCLK);
/* adjust NVM wait states, see table 42.30 (p. 1070) in the datasheet */
#if (CLOCK_CORECLOCK > 24000000)
PM->APBAMASK.reg |= PM_AHBMASK_NVMCTRL;
NVMCTRL->CTRLB.reg |= NVMCTRL_CTRLB_RWS(1);
PM->APBAMASK.reg &= ~PM_AHBMASK_NVMCTRL;
#endif
/* configure internal 8MHz oscillator to run without prescaler */
SYSCTRL->OSC8M.bit.PRESC = 0;
SYSCTRL->OSC8M.bit.ONDEMAND = 1;
SYSCTRL->OSC8M.bit.RUNSTDBY = 0;
SYSCTRL->OSC8M.bit.ENABLE = 1;
while (!(SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_OSC8MRDY)) {}
#if CLOCK_USE_PLL
/* reset the GCLK module so it is in a known state */
GCLK->CTRL.reg = GCLK_CTRL_SWRST;
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) {}
/* setup generic clock 1 to feed DPLL with 1MHz */
GCLK->GENDIV.reg = (GCLK_GENDIV_DIV(8) |
GCLK_GENDIV_ID(1));
GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN |
GCLK_GENCTRL_SRC_OSC8M |
GCLK_GENCTRL_ID(1));
GCLK->CLKCTRL.reg = (GCLK_CLKCTRL_GEN(1) |
GCLK_CLKCTRL_ID(1) |
GCLK_CLKCTRL_CLKEN);
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) {}
/* enable PLL */
SYSCTRL->DPLLRATIO.reg = (SYSCTRL_DPLLRATIO_LDR(CLOCK_PLL_MUL));
SYSCTRL->DPLLCTRLB.reg = (SYSCTRL_DPLLCTRLB_REFCLK_GCLK);
SYSCTRL->DPLLCTRLA.reg = (SYSCTRL_DPLLCTRLA_ENABLE);
while(!(SYSCTRL->DPLLSTATUS.reg &
(SYSCTRL_DPLLSTATUS_CLKRDY | SYSCTRL_DPLLSTATUS_LOCK))) {}
/* select the PLL as source for clock generator 0 (CPU core clock) */
GCLK->GENDIV.reg = (GCLK_GENDIV_DIV(CLOCK_PLL_DIV) |
GCLK_GENDIV_ID(0));
GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN |
GCLK_GENCTRL_SRC_FDPLL |
GCLK_GENCTRL_ID(0));
#else /* do not use PLL, use internal 8MHz oscillator directly */
GCLK->GENDIV.reg = (GCLK_GENDIV_DIV(CLOCK_DIV) |
GCLK_GENDIV_ID(0));
GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN |
GCLK_GENCTRL_SRC_OSC8M |
GCLK_GENCTRL_ID(0));
#endif
/* make sure we synchronize clock generator 0 before we go on */
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) {}
/* Setup Clock generator 2 with divider 1 (32.768kHz) */
GCLK->GENDIV.reg = (GCLK_GENDIV_ID(2) | GCLK_GENDIV_DIV(0));
GCLK->GENCTRL.reg = (GCLK_GENCTRL_ID(2) | GCLK_GENCTRL_GENEN |
GCLK_GENCTRL_RUNSTDBY |
GCLK_GENCTRL_SRC_OSCULP32K);
while (GCLK->STATUS.bit.SYNCBUSY) {}
/* redirect all peripherals to a disabled clock generator (7) by default */
for (int i = 0x3; i <= 0x22; i++) {
GCLK->CLKCTRL.reg = ( GCLK_CLKCTRL_ID(i) | GCLK_CLKCTRL_GEN_GCLK7 );
while (GCLK->STATUS.bit.SYNCBUSY) {}
}
}
// ****************************************************************************
void HAL_hardware_init(bool is_servo_reader, bool servo_output_enabled, bool uart_output_enabled)
{
uint32_t *coarse_p;
uint32_t coarse;
// FIXME: output diagnostics on UART only if uart_output_enabled is false
(void) uart_output_enabled;
// ------------------------------------------------
// Perform GPIO initialization as early as possible
HAL_gpio_set(HAL_GPIO_BLANK);
HAL_gpio_out(HAL_GPIO_BLANK);
HAL_gpio_clear(HAL_GPIO_SWITCHED_LIGHT_OUTPUT);
HAL_gpio_out(HAL_GPIO_SWITCHED_LIGHT_OUTPUT);
HAL_gpio_out(HAL_GPIO_XLAT);
HAL_gpio_out(HAL_GPIO_SIN);
HAL_gpio_pmuxen(HAL_GPIO_SIN);
HAL_gpio_out(HAL_GPIO_SCK);
HAL_gpio_pmuxen(HAL_GPIO_SCK);
HAL_gpio_in(HAL_GPIO_CH3);
HAL_gpio_pmuxen(HAL_GPIO_CH3);
HAL_gpio_in(HAL_GPIO_PUSH_BUTTON);
HAL_gpio_pmuxen(HAL_GPIO_USB_DM);
HAL_gpio_pmuxen(HAL_GPIO_USB_DP);
// Turn the status LED on to signify we are initializing
HAL_gpio_out(HAL_GPIO_LED);
HAL_gpio_out(HAL_GPIO_LED2);
HAL_gpio_set(HAL_GPIO_LED);
HAL_gpio_set(HAL_GPIO_LED2);
// ------------------------------------------------
// Configure GPIOs shared between servo inputs, servo output and UART
// Output UART Tx on OUT in all cases when the servo output is disabled
if (servo_output_enabled) {
HAL_gpio_out(HAL_GPIO_OUT);
HAL_gpio_pmuxen(HAL_GPIO_OUT);
}
else {
HAL_gpio_out(HAL_GPIO_TX_ON_OUT);
HAL_gpio_pmuxen(HAL_GPIO_TX_ON_OUT);
tx_pad = HAL_GPIO_TX_ON_OUT.txpo;
}
if (is_servo_reader) {
HAL_gpio_in(HAL_GPIO_ST);
HAL_gpio_pmuxen(HAL_GPIO_ST);
HAL_gpio_in(HAL_GPIO_TH);
HAL_gpio_pmuxen(HAL_GPIO_TH);
}
else {
HAL_gpio_in(HAL_GPIO_RX);
HAL_gpio_pmuxen(HAL_GPIO_RX);
// In case we have a UART and a servi output, TH is unused. We can
// use TH as Tx signal, just like in the LPC812 Mk4 light controller
if (servo_output_enabled) {
HAL_gpio_out(HAL_GPIO_TX_ON_TH);
HAL_gpio_pmuxen(HAL_GPIO_TX_ON_TH);
tx_pad = HAL_GPIO_TX_ON_TH.txpo;
}
else {
HAL_gpio_in(HAL_GPIO_TH);
HAL_gpio_pmuxen(HAL_GPIO_TH);
}
}
// ------------------------------------------------
// Since we intend to run at 48 MHz system clock, we neeed to conigure
// one wait state for the flash according to the datasheet.
NVMCTRL->CTRLB.reg = NVMCTRL_CTRLB_RWS(1);
// ------------------------------------------------
// Set up the PLL to provide a 48 MHz system clock
SYSCTRL->INTFLAG.reg =
SYSCTRL_INTFLAG_BOD33RDY |
SYSCTRL_INTFLAG_BOD33DET |
SYSCTRL_INTFLAG_DFLLRDY;
SYSCTRL->DFLLCTRL.reg = 0;
while (!(SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_DFLLRDY));
SYSCTRL->DFLLMUL.reg = SYSCTRL_DFLLMUL_MUL(48000);
// Load PLL calibration values from NVRAM
coarse_p = (uint32_t *)FUSES_DFLL48M_COARSE_CAL_ADDR;
coarse = (*coarse_p & FUSES_DFLL48M_COARSE_CAL_Msk) >> FUSES_DFLL48M_COARSE_CAL_Pos;
SYSCTRL->DFLLVAL.reg = SYSCTRL_DFLLVAL_COARSE(coarse) | SYSCTRL_DFLLVAL_FINE(512);
SYSCTRL->DFLLCTRL.reg =
SYSCTRL_DFLLCTRL_ENABLE |
SYSCTRL_DFLLCTRL_USBCRM |
SYSCTRL_DFLLCTRL_BPLCKC |
SYSCTRL_DFLLCTRL_STABLE |
SYSCTRL_DFLLCTRL_CCDIS;
while (!(SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_DFLLRDY));
// ------------------------------------------------
// Reset the generic clock control block
GCLK->CTRL.reg = GCLK_CTRL_SWRST;
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
// Setup GENCLK0 to run at 48 MHz. This clock is used for high speed
// peripherals such as SPI, USB and UART
GCLK->GENDIV.reg =
GCLK_GENDIV_ID(0) |
GCLK_GENDIV_DIV(1);
GCLK->GENCTRL.reg =
GCLK_GENCTRL_ID(0) |
GCLK_GENCTRL_SRC_DFLL48M |
GCLK_GENCTRL_RUNSTDBY |
GCLK_GENCTRL_GENEN;
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
// Setup GENCLK1 to run at 2 MHz. We use GENCLK1 for timers that need
// microsecond resolution (e.g. servo output and servo reader).
// We derive the clock from the 48 MHz PLL, so we use a clock divider of
// 24
GCLK->GENDIV.reg =
GCLK_GENDIV_ID(1) |
GCLK_GENDIV_DIV(24);
GCLK->GENCTRL.reg =
GCLK_GENCTRL_ID(1) |
GCLK_GENCTRL_SRC_DFLL48M |
GCLK_GENCTRL_RUNSTDBY |
GCLK_GENCTRL_GENEN;
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
// ------------------------------------------------
// Turn on power to the peripherals we use
PM->APBCMASK.reg =
UART_SERCOM_APBCMASK |
SPI_SERCOM_APBCMASK |
PM_APBAMASK_EIC |
PM_APBCMASK_EVSYS |
PM_APBCMASK_TCC0 |
PM_APBCMASK_TC4 |
PM_APBBMASK_USB;
// ------------------------------------------------
// Initialize the Event System
// Use GLKGEN0 (48 MHz) as clock source for the EVSYS0..2
GCLK->CLKCTRL.reg =
GCLK_CLKCTRL_ID_EVSYS_0 |
GCLK_CLKCTRL_CLKEN |
GCLK_CLKCTRL_GEN(0);
GCLK->CLKCTRL.reg =
GCLK_CLKCTRL_ID_EVSYS_1 |
GCLK_CLKCTRL_CLKEN |
GCLK_CLKCTRL_GEN(0);
GCLK->CLKCTRL.reg =
GCLK_CLKCTRL_ID_EVSYS_2 |
GCLK_CLKCTRL_CLKEN |
GCLK_CLKCTRL_GEN(0);
// Always turn on the Generic Clock within EVSYS
EVSYS->CTRL.reg = EVSYS_CTRL_GCLKREQ;
// ------------------------------------------------
// Configure the SYSTICK to create an interrupt every 1 millisecond
SysTick_Config(48000);
NVIC_SetPriority(SysTick_IRQn, 0);
// ------------------------
// The UART Tx can be used for diagnostics output if it is not in use.
// The pin is in use when HAL gets passed "uart_output_enabled==true"
// (UART used for pre-processor, winch or slave output), or when we
// have a servo reader and the servo output is enabled.
//
// Or in other words: the UART can output diagnostics on the OUT pin
// when it is not in use, or the UART can output diagnostics on the TH/Tx
// pin when we the UART reader is in use and no UART output function is
// configured.
diagnostics_on_uart = !uart_output_enabled;
if (is_servo_reader) {
if (servo_output_enabled) {
diagnostics_on_uart = false;
}
}
__enable_irq();
}
void uart_init(uint32_t baud) {
uint32_t UART_CLKGEN_F = 8000000UL;
uint64_t br = (uint64_t)65536 * (UART_CLKGEN_F - 16 * baud) / UART_CLKGEN_F;
//enable GPS pins
// SaLPinMode(MTK3339_RX_PIN,INPUT);
// SaLPinMode(MTK3339_TX_PIN,OUTPUT);
SYSCTRL->OSC8M.reg -= SYSCTRL_OSC8M_ENABLE;
SYSCTRL->OSC8M.reg -= SYSCTRL_OSC8M_PRESC_3;
SYSCTRL->OSC8M.reg |= SYSCTRL_OSC8M_ENABLE;
//portB22->PINCFG->reg = 0x44;
// portB23->PINCFG->reg = 0x44;
// GPS pin configs
((Port *)PORT)->Group[1].PINCFG[22].reg = 0x41;
((Port *)PORT)->Group[1].PINCFG[23].reg = 0x41;
((Port *)PORT)->Group[1].PMUX[11].reg = 0x32;
// usb port configs
// ((Port *)PORT)->Group[0].PINCFG[24].reg = 0x41;
// ((Port *)PORT)->Group[0].PINCFG[25].reg = 0x41;
// ((Port *)PORT)->Group[0].PMUX[12].reg = 0x24;
//enable power to sercom 5 module
PM->APBCMASK.reg |= PM_APBCMASK_SERCOM5;
//enable and configure the sercom clock
GCLK->GENDIV.reg = GCLK_GENDIV_ID(3) |
GCLK_GENDIV_DIV(1);
GCLK->GENCTRL.reg = GCLK_GENCTRL_ID(3) |
GCLK_GENCTRL_SRC_OSC8M |
GCLK_GENCTRL_IDC |
GCLK_GENCTRL_RUNSTDBY |
GCLK_GENCTRL_GENEN;
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID_SERCOM5_CORE |
GCLK_CLKCTRL_GEN_GCLK3 |
GCLK_CLKCTRL_CLKEN;
// GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID_SERCOMX_SLOW |
// GCLK_CLKCTRL_GEN_GCLK3 |
// GCLK_CLKCTRL_CLKEN;
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID_SERCOM3_CORE |
GCLK_CLKCTRL_GEN_GCLK3 |
GCLK_CLKCTRL_CLKEN;
//configure the sercom module for the gps (sercom 5)
SERCOM5->USART.CTRLA.reg = SERCOM_USART_CTRLA_DORD |
SERCOM_USART_CTRLA_MODE_USART_INT_CLK |
SERCOM_USART_CTRLA_RXPO(3) |
SERCOM_USART_CTRLA_TXPO(1);
uart_sync(SERCOM5);
SERCOM5->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN |
SERCOM_USART_CTRLB_CHSIZE(0/*8 bits*/);
// SERCOM_USART_CTRLB_SFDE;
uart_sync(SERCOM5);
SERCOM5->USART.BAUD.reg = (uint16_t)br;
uart_sync(SERCOM5);
SERCOM5->USART.CTRLA.reg |= SERCOM_USART_CTRLA_ENABLE;
uart_sync(SERCOM5);
SaLInitUsart(&USART_0,SERCOM5);
}