/* \brief This is an example that shows how to do the following:
* - configure and start the OSC32K 32kHz oscillator,
* - set-up a generic clock at 32kHz with the OSC32K osc as a source,
* - output the generic clock to a pin,
* - toggle all four leds 10 times,
* - then switch the device into the static sleep mode (while still maintaining
* the OSC32 32kHz oscillator).
*
*/
int main(void)
{
//! OSC32K config.
scif_osc32_opt_t osc32Conf = {
SCIF_OSC_MODE_2PIN_CRYSTAL_HICUR, // 2-pin Crystal and high current mode. Crystal is connected to XIN32/XOUT32.
OSC32_STARTUP, // oscillator startup time
true, // select the alternate xin32_2 and xout32_2 for the 32kHz crystal oscillator
false, // disable the 1kHz output
true // enable the 32kHz output
};
volatile int i,j;
// - configure and start the OSC32K 32kHz oscillator,
if(PASS != scif_start_osc32(&osc32Conf, true))
{ // Error
while(1)
{
gpio_tgl_gpio_pin(LED3_GPIO);
for(i=1000; i; i--);
}
}
// - set-up a generic clock at 32kHz with the OSC32K osc as a source,
// - output the generic clock to a pin.
local_start_gc();
// - toggle all four leds 10 times,
for(i=25;i;i--)
{
gpio_tgl_gpio_pin(LED0_GPIO); gpio_tgl_gpio_pin(LED1_GPIO);
gpio_tgl_gpio_pin(LED2_GPIO); gpio_tgl_gpio_pin(LED3_GPIO);
for(j=1000;j;j--);
}
// - then switch the device into the static sleep mode (while still maintaining
// the OSC32 32kHz oscillator).
// If there is a chance that any PB write operations are incomplete, the CPU
// should perform a read operation from any register on the PB bus before
// executing the sleep instruction.
AVR32_INTC.ipr[0]; // Dummy read
SLEEP(AVR32_PM_SMODE_STATIC);
// Note: in static sleep mode, the GCLK output is not maintained but the OSC32K
// oscillator is still active (check the XIN32_2 pin (500mv peek-to-peek amplitude)).
while(1);
}
/**
** PDCA Init.
**/
void init_pdca(void)
{
// PDCA channel 0/1 options
static const pdca_channel_options_t PDCA_CH_OPTIONS =
{
.addr = (void *)aDataTransfered, // memory address
.pid = AVR32_PDCA_PID_USART2_TX, // select peripheral - data are transmit on USART TX line.
.size = 0, // transfer counter
.r_addr = (void *)aDataTransfered, // next memory address
.r_size = sizeof(aDataTransfered), // next transfer counter
.transfer_size = PDCA_TRANSFER_SIZE_BYTE, // select size of one data packet
.etrig = true // Trigger transfer on event.
};
Disable_global_interrupt();
// Initialize interrupt vectors.
INTC_init_interrupts();
// Register the PDCA interrupt handler to the interrupt controller.
INTC_register_interrupt(&pdca_int_handler, PDCA_CHANNEL_IRQ, AVR32_INTC_INT0);
Enable_global_interrupt();
// Init PDCA channel with the pdca_options.
pdca_init_channel(PDCA_CHANNEL_USART, &PDCA_CH_OPTIONS);
pdca_channel = pdca_get_handler(PDCA_CHANNEL_USART); // For use in the pdca interrupt handler.
// Enable pdca transfer error interrupt & transfer complete interrupt.
pdca_enable_interrupt_transfer_error(PDCA_CHANNEL_USART);
pdca_enable_interrupt_transfer_complete(PDCA_CHANNEL_USART);
// Enable the PEVC channel "PDCA CHANNEL 0/1 ONE-ITEM-TRANSFER"
PEVC_CHANNELS_ENABLE(ppevc, 1<<PEVC_PDCA_SOT_USER);
// Enable the PDCA.
pdca_enable(PDCA_CHANNEL_USART);
}
/**
** AST Init.
**/
void init_ast(void)
{
avr32_ast_pir0_t pir = {
.insel = 14 // Set a event every second
};
ast_calendar_t ast_calendar;
ast_calendar.FIELD.sec = 30;
ast_calendar.FIELD.min = 45;
ast_calendar.FIELD.hour = 12;
ast_calendar.FIELD.day = 7;
ast_calendar.FIELD.month= 10;
ast_calendar.FIELD.year = 9;
scif_osc32_opt_t opt;
opt.mode = SCIF_OSC_MODE_2PIN_CRYSTAL;
opt.startup = AVR32_SCIF_OSCCTRL32_STARTUP_0_RCOSC;
// Start OSC_32KHZ
scif_start_osc32(&opt,true);
// Initialize the AST
if (!ast_init_calendar(&AVR32_AST, AST_OSC_32KHZ, AST_PSEL_32KHZ_1HZ, ast_calendar))
{
print_dbg("Error initializing the AST\r\n");
while(1);
}
ast_set_periodic0_value(&AVR32_AST,pir);
ast_enable_periodic0(&AVR32_AST);
// Clear All Interrupt
AVR32_AST.scr=0xFFFFFFFF;
// Enable the AST
ast_enable(&AVR32_AST);
}
/*! \brief Initializes the MCU system clocks.
*/
static void init_sys_clocks(void)
{
/*! \name System Clock Frequencies
*/
//! @{
static pcl_freq_param_t pcl_freq_param =
{
.cpu_f = FCPU_HZ,
.pba_f = FPBA_HZ,
.osc0_f = FOSC0,
.osc0_startup = OSC0_STARTUP
};
//! @}
// Configure system clocks.
if (pcl_configure_clocks(&pcl_freq_param) != PASS) {
while(1);
}
}
/*! \brief This example show a DMA transfer to USART controlled by the AST
periodic alarm using the PEVC.
*/
int main(void)
{
int i;
// Init the string with a simple recognizable pattern.
for(i=0;i<sizeof(aDataTransfered);i++)
aDataTransfered[i] = '0' + (i%36);
init_sys_clocks();
init_usart();
gpio_clr_gpio_pin(LED0_GPIO);
init_pevc();
init_ast();
init_pdca();
while(1)
{
gpio_tgl_gpio_pin(LED1_GPIO);
delay_ms(500); //Wait 500ms
}
}
/*!
* \brief main function : do init and loop (poll if configured so)
*/
int main(void)
{
char temp[20];
char *ptemp;
static const gpio_map_t USART_GPIO_MAP = {
{EXAMPLE_USART_RX_PIN, EXAMPLE_USART_RX_FUNCTION},
{EXAMPLE_USART_TX_PIN, EXAMPLE_USART_TX_FUNCTION}
};
/* USART options */
static const usart_options_t USART_OPTIONS = {
.baudrate = 57600,
.charlength = 8,
.paritytype = USART_NO_PARITY,
.stopbits = USART_1_STOPBIT,
.channelmode = 0
};
#if BOARD == UC3L_EK
scif_osc32_opt_t opt = {
/*
* 2-pin Crystal connected to XIN32/XOUT32 and high current
* mode.
*/
SCIF_OSC_MODE_2PIN_CRYSTAL_HICUR,
/* oscillator startup time */
AVR32_SCIF_OSCCTRL32_STARTUP_0_RCOSC,
/*
* select alternate xin32_2 and xout32_2 for 32kHz crystal
* oscillator
*/
true,
/* disable the 1kHz output */
false,
/* enable the 32kHz output */
true
};
#else
scif_osc32_opt_t opt;
opt.mode = SCIF_OSC_MODE_2PIN_CRYSTAL;
opt.startup = AVR32_SCIF_OSCCTRL32_STARTUP_0_RCOSC;
#endif
#if BOARD == UC3L_EK
/*
* Note: on the AT32UC3L-EK board, there is no crystal/external clock
* connected to the OSC0 pinout XIN0/XOUT0. We shall then program the
* DFLL and switch the main clock source to the DFLL.
*/
pcl_configure_clocks(&pcl_dfll_freq_param);
/*
* Note: since it is dynamically computing the appropriate field values
* of the configuration registers from the parameters structure, this
* function is not optimal in terms of code size. For a code size
* optimal solution, it is better to create a new function from
* pcl_configure_clocks_dfll0() and modify it to use preprocessor
* computation from pre-defined target frequencies.
*/
#else
pcl_switch_to_osc(PCL_OSC0, FOSC0, OSC0_STARTUP);
#endif
/* Start OSC_32KHZ */
scif_start_osc32(&opt, true);
/* Assign GPIO pins to USART0. */
gpio_enable_module(USART_GPIO_MAP,
sizeof(USART_GPIO_MAP) / sizeof(USART_GPIO_MAP[0]));
/* Initialize USART in RS232 mode */
usart_init_rs232(EXAMPLE_USART, &USART_OPTIONS, FPBA);
/* Welcome message */
usart_write_line(EXAMPLE_USART, "\x1B[2J\x1B[H\r\nATMEL\r\n");
usart_write_line(EXAMPLE_USART, "AVR32 UC3 - AST example\r\n");
usart_write_line(EXAMPLE_USART,
"AST 32 KHz oscillator program test.\r\n");
ast_calendar_t ast_calendar;
ast_calendar.FIELD.sec = 0;
ast_calendar.FIELD.min = 15;
ast_calendar.FIELD.hour = 12;
ast_calendar.FIELD.day = 5;
ast_calendar.FIELD.month = 6;
ast_calendar.FIELD.year = 9;
/* Initialize the AST */
if (!ast_init_calendar(&AVR32_AST,
AST_OSC_32KHZ, AST_PSEL_32KHZ_1HZ, ast_calendar)) {
usart_write_line(EXAMPLE_USART,
"Error initializing the AST\r\n");
while (1) {
}
}
/* Enable the AST */
ast_enable(&AVR32_AST);
volatile int i;
while (1) {
/* slow down operations */
for (i = 0; i < 10000; i++) {
}
gpio_tgl_gpio_pin(LED0_GPIO);
/* Set cursor to the position (1; 5) */
usart_write_line(EXAMPLE_USART, "\x1B[5;1H");
ast_calendar = ast_get_calendar_value(&AVR32_AST);
usart_write_line(EXAMPLE_USART, "Timer: ");
ptemp = print_i(temp, ast_calendar.FIELD.sec);
usart_write_line(EXAMPLE_USART, ptemp);
usart_write_line(EXAMPLE_USART, " sec ");
}
}
/*!
* \brief main function : do init and loop (poll if configured so)
*/
int main(void)
{
char temp[20];
char *ptemp;
uint32_t ast_alarm;
static const gpio_map_t USART_GPIO_MAP = {
{EXAMPLE_USART_RX_PIN, EXAMPLE_USART_RX_FUNCTION},
{EXAMPLE_USART_TX_PIN, EXAMPLE_USART_TX_FUNCTION}
};
/* USART options */
static const usart_options_t USART_OPTIONS = {
.baudrate = 57600,
.charlength = 8,
.paritytype = USART_NO_PARITY,
.stopbits = USART_1_STOPBIT,
.channelmode = 0
};
#if BOARD == UC3L_EK
scif_osc32_opt_t opt = {
/* 2-pin Crystal connected to XIN32/XOUT32 and high current
* mode. */
SCIF_OSC_MODE_2PIN_CRYSTAL_HICUR,
/* oscillator startup time */
AVR32_SCIF_OSCCTRL32_STARTUP_0_RCOSC,
/* select alternate xin32_2 and xout32_2 for 32kHz crystal
* oscillator */
true,
/* disable the 1kHz output */
false,
/* enable the 32kHz output */
true
};
#else
scif_osc32_opt_t opt;
opt.mode = SCIF_OSC_MODE_2PIN_CRYSTAL;
opt.startup = AVR32_SCIF_OSCCTRL32_STARTUP_0_RCOSC;
#endif
#if BOARD == UC3L_EK
/*
* Note: on the AT32UC3L-EK board, there is no crystal/external clock
* connected to the OSC0 pinout XIN0/XOUT0. We shall then program the
* DFLL and switch the main clock source to the DFLL.
*/
pcl_configure_clocks(&pcl_dfll_freq_param);
/*
* Note: since it is dynamically computing the appropriate field values
* of the configuration registers from the parameters structure, this
* function is not optimal in terms of code size. For a code size
* optimal solution, it is better to create a new function from
* pcl_configure_clocks_dfll0() and modify it to use preprocessor
* computation from pre-defined target frequencies.
*/
#else
pcl_switch_to_osc(PCL_OSC0, FOSC0, OSC0_STARTUP);
#endif
/* Start OSC_32KHZ */
scif_start_osc32(&opt, true);
/* Assign GPIO pins to USART0. */
gpio_enable_module(USART_GPIO_MAP,
sizeof(USART_GPIO_MAP) / sizeof(USART_GPIO_MAP[0]));
/* Initialize USART in RS232 mode */
usart_init_rs232(EXAMPLE_USART, &USART_OPTIONS, FPBA);
/* Welcome sentence // 2-pin Crystal and high current mode. */
/* Crystal is connected to XIN32/XOUT32. */
usart_write_line(EXAMPLE_USART, "\x1B[2J\x1B[H\r\nATMEL\r\n");
usart_write_line(EXAMPLE_USART, "AVR32 UC3 - AST example 2\r\n");
usart_write_line(EXAMPLE_USART,
"AST 32 KHz oscillator counter example.\r\n");
usart_write_line(EXAMPLE_USART,
"Alarm0 wakeup from static sleep mode every second.\r\n");
/* Using counter mode and set it to 0 */
unsigned long ast_counter = 0;
/* Initialize the AST */
if (!ast_init_counter(&AVR32_AST,
AST_OSC_32KHZ, AST_PSEL_32KHZ_1HZ, ast_counter)) {
usart_write_line(EXAMPLE_USART,
"Error initializing the AST\r\n");
while (1) {
}
}
/* Alarm 0 sends a wakeup signal to the Power manager */
ast_enable_alarm_async_wakeup(&AVR32_AST, 0);
/* Enable the AST */
ast_enable(&AVR32_AST);
while (1) {
/* disable alarm 0 */
ast_disable_alarm0(&AVR32_AST);
/* ast_init_counter Set Alarm to current time+30 seconds */
ast_alarm = ast_counter + 1;
ast_set_alarm0_value(&AVR32_AST, ast_alarm);
/* Enable alarm 0 */
ast_enable_alarm0(&AVR32_AST);
/*
* Precautions when entering a sleep mode
* Modules communicating with external circuits should normally
* be disabled before entering a sleep mode that will stop the
* module operation.
* Make sure the USART dumps the last message completely before
* turning it off.
*/
while (!usart_tx_empty(EXAMPLE_USART)) {
}
pcl_disable_module(EXAMPLE_USART_CLOCK_MASK);
/*
* Since we're going into a sleep mode deeper than IDLE, all HSB
* masters must be stopped before entering the sleep mode.
* Note: since we're not using the PDCA, we don't have to stop
*it.
*/
/*
* If there is a chance that any PB write operations are
*incomplete,
* the CPU should perform a read operation from any register on
*the
* PB bus before executing the sleep instruction.
*/
AVR32_INTC.ipr[0]; /* Dummy read */
/* Go into static sleep mode */
SLEEP(AVR32_PM_SMODE_STATIC);
/* We're out of the static sleep mode now => re-enable the USART
* module */
pcl_enable_module(EXAMPLE_USART_CLOCK_MASK);
/* After wake up, clear the Alarm0 */
ast_clear_alarm_status_flag(&AVR32_AST, 0);
/* Toggle Led0 */
gpio_tgl_gpio_pin(LED0_GPIO);
/* Set cursor to the position (1; 6) */
usart_write_line(EXAMPLE_USART, "\x1B[6;1H");
ast_counter = ast_get_counter_value(&AVR32_AST);
usart_write_line(EXAMPLE_USART, "Timer: ");
ptemp = print_i(temp, ast_counter);
usart_write_line(EXAMPLE_USART, ptemp);
usart_write_line(EXAMPLE_USART, " sec ");
}
}
/**
* \brief Initializes the ACIFB module with trigger
* - Start the GCLK for ACIFB
* - Initialize the trigger mode & compare interrupts for ACIFB
*
* \retval STATUS_OK Configuration OK
* \retval ERR_TIMEOUT Timeout on configuring ACIFB module
* \retval ERR_BUSY ACIFB module unable to configure the trigger
*/
static status_code_t ac_init()
{
/* struct genclk_config gcfg; */
uint32_t div = sysclk_get_pba_hz() / AC_GCLK_FREQUENCY;
scif_gc_setup(AC_GCLK_ID, AC_GCLK_SRC, AVR32_GC_DIV_CLOCK, div);
/* Now enable the generic clock */
scif_gc_enable(AC_GCLK_ID);
/* GPIO pin/acifb - function map. */
static const gpio_map_t ACIFB_GPIO_MAP = {
{EXAMPLE_ACIFBP_PIN, EXAMPLE_ACIFBP_FUNCTION},
{EXAMPLE_ACIFBN_PIN, EXAMPLE_ACIFBN_FUNCTION},
};
/* ACIFB Configuration */
const acifb_t acifb_opt = {
.sut = 6, /* Resolution mode */
.actest = TESTMODE_OFF,
.eventen = true
};
/* ACIFB Channel Configuration */
const acifb_channel_t acifb_channel_opt = {
/* Filter length */
.filter_len = 0,
/* Hysteresis value */
.hysteresis_value = 0,
/* Output event when ACOUT is zero? */
.event_negative = false,
/* Output event when ACOUT is one? */
.event_positive = false,
/* Set the positive input */
.positive_input = PI_ACP,
/* Set the negative input */
.negative_input = NI_ACN,
/* Set the comparator mode */
.mode = MODE_EVENT_TRIGGERED,
/* Interrupt settings */
.interrupt_settings = IS_VINP_LT_VINN,
/* Analog comparator channel number */
.ac_n = EXAMPLE_ACIFB_CHANNEL
};
/* Enable Analog Comparator clock */
sysclk_enable_pba_module(SYSCLK_ACIFB);
/* Disable pullup on ACIFB channel input pins */
gpio_disable_pin_pull_up(EXAMPLE_ACIFBP_PIN);
gpio_disable_pin_pull_up(EXAMPLE_ACIFBN_PIN);
/* Enable the ACIFB pins */
gpio_enable_module(ACIFB_GPIO_MAP,
sizeof(ACIFB_GPIO_MAP) / sizeof(ACIFB_GPIO_MAP[0]));
/* Configure the ACIFB peripheral */
acifb_setup_and_enable(acifb, &acifb_opt);
/* Configure the ACIFB channel with interrupt & trigger */
acifb_channels_setup(acifb, &acifb_channel_opt, AC_NB_CHANNELS);
/* Disable global interrupts */
cpu_irq_disable();
/*
* Initialize the interrupt vectors
* Note: This function adds nothing for IAR as the interrupts are
* handled by the IAR compiler itself. It provides an abstraction
* between GCC & IAR compiler to use interrupts.
* Refer function implementation in interrupt_avr32.h
*/
irq_initialize_vectors();
/*
* Register the ACIFB interrupt handler
* Note: This function adds nothing for IAR as the interrupts are
* handled by the IAR compiler itself. It provides an abstraction
* between GCC & IAR compiler to use interrupts.
* Refer function implementation in interrupt_avr32.h
*/
irq_register_handler(&ACIFB_interrupt_handler, AVR32_ACIFB_IRQ,
AC_INTERRUPT_PRIORITY);
/* Enable Analog Comparator Channel interrupt */
acifb_enable_comparison_interrupt(acifb, EXAMPLE_ACIFB_CHANNEL);
/* Enable global interrupts */
cpu_irq_enable();
return STATUS_OK;
} /* End of ac_init() */
/**
* \brief Asynchronous Timer Initialization
* - Start the 32KHz Oscillator
* - Initializes the AST module with periodic trigger events
*
* \retval STATUS_OK Configuration OK
* \retval ERR_BUSY Error in configuring the AST module
*/
static status_code_t ast_init()
{
/* Initial Count value to write in AST */
unsigned long ast_counter = 0;
/* Set the prescaler to set a periodic trigger from AST */
avr32_ast_pir0_t pir = {
.insel = AST_TRIGGER_PRESCALER
};
/* Set the OSC32 parameters */
scif_osc32_opt_t osc32_opt = {
.mode = SCIF_OSC_MODE_2PIN_CRYSTAL_HICUR,
.startup = OSC32_STARTUP_8192,
.pinsel = BOARD_OSC32_PINSEL,
.en1k = false,
.en32k = true
};
/* Enable the 32KHz Oscillator */
scif_start_osc32(&osc32_opt, true);
/* Enable the Peripheral Event System Clock */
sysclk_enable_hsb_module(SYSCLK_EVENT);
/* Enable PBA clock for AST clock to switch its source */
sysclk_enable_pba_module(SYSCLK_AST);
/* Initialize the AST in counter mode */
if (!ast_init_counter(&AVR32_AST, AST_CLOCK_SOURCE, AST_PRESCALER,
ast_counter)) {
return ERR_BUSY;
}
/* Initialize the periodic value register with the prescaler */
ast_set_periodic0_value(&AVR32_AST, pir);
/* Enable the AST periodic event */
ast_enable_periodic0(&AVR32_AST);
/* Clear All AST Interrupt request and clear SR */
ast_clear_all_status_flags(&AVR32_AST);
/* Enable the AST */
ast_enable(&AVR32_AST);
/* Disable PBA clock for AST after switching its source to OSC32 */
sysclk_disable_pba_module(SYSCLK_AST);
return STATUS_OK;
} /* End of ast_init() */
/**
* \brief Low Power Configuration
* Initializes the power saving measures to reduce power consumption
* - Enable pull-ups on GPIO pins
* - Disable the clocks to unwanted modules
* - Disable internal voltage regulator when in 1.8V supply mode
*/
static void power_save_measures_init()
{
uint8_t i;
uint32_t gpio_mask[AVR32_GPIO_PORT_LENGTH] = {0};
/*
* Enable internal pull-ups on all unused GPIO pins
* Note: Pull-ups on Oscillator or JTAG pins can be enabled only if they
* are not used as an oscillator or JTAG pin respectively.
*/
for (i = 0; i < (sizeof(gpio_used_pins) / sizeof(uint32_t)); i++) {
gpio_mask[gpio_used_pins[i] >>
5] |= 1 << (gpio_used_pins[i] & 0x1F);
}
for (i = 0; i < AVR32_GPIO_PORT_LENGTH; i++) {
gpio_configure_group(i, ~(gpio_mask[i]),
GPIO_PULL_UP | GPIO_DIR_INPUT);
}
/* Disable OCD clock which is not disabled by sysclk service */
sysclk_disable_cpu_module(SYSCLK_OCD);
#if POWER_SUPPLY_MODE_1_8V
/*
* When using 1.8V Single supply mode, the Voltage Regulator can be
* shut-down using the code below, in-order to save power.
* See Voltage Regulator Calibration Register in datasheet for more
*info.
* CAUTION: When using 3.3V Single supply mode, the Voltage Regulator
* cannot be shut-down and the application will hang in this loop.
*/
uint32_t tmp = (AVR32_SCIF.vregcr);
tmp &= (~(1 << 5 | 1 << 18));
AVR32_SCIF.unlock = 0xAA000000 | AVR32_SCIF_VREGCR;
AVR32_SCIF.vregcr = tmp;
/* Wait until internal voltage regulator is disabled. */
while ((AVR32_SCIF.vregcr & 0x00040020)) {
}
#endif
} /* End of power_save_measures_init() */
/**
* \brief Initializes the ADCIFB module with trigger
* - Initialize the trigger mode & compare interrupts for ADCIFB
*
* \retval STATUS_OK Configuration OK
* \retval ERR_TIMEOUT Timeout on configuring ADCIFB module
* \retval ERR_BUSY ADCIFB module unable to configure the trigger
*/
static status_code_t adc_init()
{
/* GPIO pin/adc - function map. */
static const gpio_map_t ADCIFB_GPIO_MAP = {
{EXAMPLE_ADCIFB_PIN, EXAMPLE_ADCIFB_FUNCTION}
};
/* ADCIFB Configuration */
adcifb_opt_t adcifb_opt = {
/* Resolution mode */
.resolution = AVR32_ADCIFB_ACR_RES_10BIT,
/* Channels Sample & Hold Time in [0,15] */
.shtim = ADC_SAMPLE_HOLD_TIME,
/* ADC Clock Prescaler */
.ratio_clkadcifb_clkadc = (sysclk_get_pba_hz()) / ADC_FREQUENCY,
.startup = ADC_STARTUP_TIME,
/* ADCIFB Sleep Mode enabled */
.sleep_mode_enable = true
};
/* Disable pull up on ADCIFB channel input pin */
gpio_disable_pin_pull_up(EXAMPLE_ADCIFB_PIN);
/* Enable the ADC pins */
gpio_enable_module(ADCIFB_GPIO_MAP,
sizeof(ADCIFB_GPIO_MAP) / sizeof(ADCIFB_GPIO_MAP[0]));
/* Enable ADCIFB clock */
sysclk_enable_pba_module(SYSCLK_ADCIFB);
/* Configure the ADCIFB peripheral */
if (adcifb_configure(adcifb, &adcifb_opt)) {
/* Error configuring the ADCIFB */
return ERR_TIMEOUT;
}
/* Configure the trigger for ADCIFB peripheral */
if (adcifb_configure_trigger(adcifb, AVR32_ADCIFB_TRGR_TRGMOD_EVT, 0)) {
/* Error configuring the trigger for ADCIFB */
return ERR_BUSY;
}
/* Enable ADCIFB Channel 0 */
adcifb_channels_enable(adcifb, EXAMPLE_ADCIFB_CHANNEL);
/* Disable global interrupts */
cpu_irq_disable();
/*
* Initialize the interrupt vectors
* Note: This function adds nothing for IAR as the interrupts are
* handled by the IAR compiler itself. It provides an abstraction
* between GCC & IAR compiler to use interrupts.
* Refer function implementation in interrupt_avr32.h
*/
irq_initialize_vectors();
/*
* Register the ADCIFB interrupt handler
* Note: This function adds nothing for IAR as the interrupts are
* handled by the IAR compiler itself. It provides an abstraction
* between GCC & IAR compiler to use interrupts.
* Refer function implementation in interrupt_avr32.h
*/
irq_register_handler(&ADCIFB_interrupt_handler, AVR32_ADCIFB_IRQ,
ADC_INTERRUPT_PRIORITY);
/*
* Set the threshold value in CVR.LV register to generate interrupt
* when the value detected is above the threshold.
* 1.500 V with 10-bit resolution
*/
adcifb_set_high_compare_value(adcifb, ADC_COMPARE_VALUE);
/* Enable the Analog Compare option in ADCIFB */
adcifb_enable_analog_compare_mode(adcifb);
/* Enable the data ready interrupt for ADCIFB */
adcifb_enable_compare_gt_interrupt(adcifb);
return STATUS_OK;
} /* End of adc_init() */
/**
* \brief Asynchronous Timer Initialization
* - Start the 32KHz Oscillator
* - Initializes the AST module with periodic trigger events
*
* \retval STATUS_OK Configuration OK
* \retval ERR_TIMEOUT Error in configuring the AST module
*/
static status_code_t ast_init()
{
/* Initial Count value to write in AST */
unsigned long ast_counter = 0;
/* Set the prescaler to set a periodic trigger from AST */
avr32_ast_pir0_t pir = {
.insel = AST_TRIGGER_PRESCALER
};
/* Set the OSC32 parameters */
scif_osc32_opt_t osc32_opt = {
.mode = SCIF_OSC_MODE_2PIN_CRYSTAL_HICUR,
.startup = OSC32_STARTUP_8192,
.pinsel = BOARD_OSC32_PINSEL,
.en1k = false,
.en32k = true
};
/* Enable the 32KHz Oscillator */
scif_start_osc32(&osc32_opt, true);
/* Enable the Peripheral Event System Clock */
sysclk_enable_hsb_module(SYSCLK_EVENT);
/* Enable PBA clock for AST clock to switch its source */
sysclk_enable_pba_module(SYSCLK_AST);
/* Initialize the AST in counter mode */
if (!ast_init_counter(&AVR32_AST, AST_CLOCK_SOURCE, AST_PRESCALER,
ast_counter)) {
return ERR_TIMEOUT;
}
/* Initialize the periodic value register with the prescaler */
ast_set_periodic0_value(&AVR32_AST, pir);
/* Enable the AST periodic event */
ast_enable_periodic0(&AVR32_AST);
/* Clear All AST Interrupt request and clear SR */
ast_clear_all_status_flags(&AVR32_AST);
/* Enable the AST */
ast_enable(&AVR32_AST);
/* Disable PBA clock for AST after switching its source to OSC32 */
sysclk_disable_pba_module(SYSCLK_AST);
return STATUS_OK;
} /* End of ast_init() */
/**
* \brief Low Power Configuration
* Initializes the power saving measures to reduce power consumption
* - Enable pullups on GPIO pins
* - Disable the clocks to unused modules
* - Disable internal voltage regulator when in 1.8V supply mode
*/
static void power_save_measures_init()
{
uint8_t i;
uint32_t gpio_mask[AVR32_GPIO_PORT_LENGTH] = {0};
/*
* Enable internal pull-ups on all unused GPIO pins
* Note: Pull-ups on Oscillator or JTAG pins can be enabled only if they
* are not used as an oscillator or JTAG pin respectively.
*/
for (i = 0; i < (sizeof(gpio_used_pins) / sizeof(uint32_t)); i++) {
gpio_mask[gpio_used_pins[i] >>
5] |= 1 << (gpio_used_pins[i] & 0x1F);
}
for (i = 0; i < AVR32_GPIO_PORT_LENGTH; i++) {
gpio_configure_group(i, ~(gpio_mask[i]),
GPIO_PULL_UP | GPIO_DIR_INPUT);
}
/* Disable OCD clock which is not disabled by sysclk service */
sysclk_disable_cpu_module(SYSCLK_OCD);
#if POWER_SUPPLY_MODE_1_8V
/*
* When using 1.8V Single supply mode, the Voltage Regulator can be
* shut-down using the code below, in-order to save power.
* See Voltage Regulator Calibration Register in datasheet for more
*info.
* CAUTION: When using 3.3V Single supply mode, the Voltage Regulator
* cannot be shut-down and the application will hang in this loop.
*/
uint32_t tmp = (AVR32_SCIF.vregcr);
tmp &= (~(1 << 5 | 1 << 18));
AVR32_SCIF.unlock = 0xAA000000 | AVR32_SCIF_VREGCR;
AVR32_SCIF.vregcr = tmp;
/* Wait until internal voltage regulator is disabled. */
while ((AVR32_SCIF.vregcr & 0x00040020)) {
}
#endif
} /* End of power_save_measures_init() */
static status_code_t ast_init()
{
/* Initial Count value to write in AST */
unsigned long ast_counter = 0;
/* Set the prescaler to set a periodic trigger from AST */
avr32_ast_pir0_t pir = {
.insel = AST_TRIGGER_PRESCALER
};
/* Set the OSC32 parameters */
scif_osc32_opt_t osc32_opt = {
#if BOARD_OSC32_IS_XTAL
.mode = SCIF_OSC_MODE_2PIN_CRYSTAL_HICUR,
#else
.mode = SCIF_OSC_MODE_EXT_CLK,
#endif
.startup = OSC32_STARTUP_8192,
.pinsel = BOARD_OSC32_PINSEL,
.en1k = false,
.en32k = true
};
/* Enable the 32KHz Oscillator */
scif_start_osc32(&osc32_opt, true);
/* Enable the Peripheral Event System Clock */
sysclk_enable_hsb_module(SYSCLK_EVENT);
/* Enable PBA clock for AST clock to switch its source */
sysclk_enable_pba_module(SYSCLK_AST);
/* Initialize the AST in counter mode */
if (!ast_init_counter(&AVR32_AST, AST_CLOCK_SOURCE, AST_PRESCALER,
ast_counter)) {
return ERR_BUSY; /* Check AST timer */
}
/* Initialize the periodic value register with the prescaler */
ast_set_periodic0_value(&AVR32_AST, pir);
/* Enable the AST periodic event */
ast_enable_periodic0(&AVR32_AST);
/* Clear All AST Interrupt request and clear SR */
ast_clear_all_status_flags(&AVR32_AST);
/* Enable the AST */
ast_enable(&AVR32_AST);
/* Disable PBA clock for AST after switching its source to OSC32 */
sysclk_disable_pba_module(SYSCLK_AST);
return STATUS_OK;
} /* End of ast_init() */
#endif
/**
* \brief Low Power Configuration
* Initializes the power saving measures to reduce power consumption
* - Enable pull ups on GPIO pins
* - Disable the clocks to unwanted modules
* - Disable internal voltage regulator when in 1.8V supply mode
*/
void power_save_measures_init()
{
uint8_t i;
uint32_t gpio_mask[AVR32_GPIO_PORT_LENGTH] = {0};
/*
* Enable internal pull-ups on all unused GPIO pins
* Note: Pull-ups on Oscillator or JTAG pins can be enabled only if they
* are not used as an oscillator or JTAG pin respectively.
*/
for (i = 0; i < (sizeof(gpio_used_pins) / sizeof(uint32_t)); i++) {
gpio_mask[gpio_used_pins[i] >>
5] |= 1 << (gpio_used_pins[i] & 0x1F);
}
for (i = 0; i < AVR32_GPIO_PORT_LENGTH; i++) {
gpio_configure_group(i, gpio_mask[i],
GPIO_PULL_UP | GPIO_DIR_INPUT);
}
/* Disable OCD clock which is not disabled by sysclk service */
sysclk_disable_cpu_module(SYSCLK_OCD);
#if POWER_SUPPLY_MODE_1_8V
/*
* When using 1.8V Single supply mode, the Voltage Regulator can be
* shut-down using the code below, in-order to save power.
* See Voltage Regulator Calibration Register in datasheet for more
*info.
* CAUTION: When using 3.3V Single supply mode, the Voltage Regulator
* cannot be shut-down and the application will hang in this loop.
*/
uint32_t tmp = (AVR32_SCIF.vregcr);
tmp &= (~(1 << 5));
AVR32_SCIF.unlock = 0xAA000000 | AVR32_SCIF_VREGCR;
AVR32_SCIF.vregcr = tmp;
/* Wait until internal voltage regulator is disabled. */
while ((AVR32_SCIF.vregcr & 0x20)) {
}
#endif
} /* End of power_save_measures_init() */
/**
* \brief main function
*/
int main(void)
{
static const gpio_map_t USART_GPIO_MAP = {
{EXAMPLE_USART_RX_PIN, EXAMPLE_USART_RX_FUNCTION},
{EXAMPLE_USART_TX_PIN, EXAMPLE_USART_TX_FUNCTION}
};
// USART options
static const usart_options_t USART_OPTIONS = {
.baudrate = 57600,
.charlength = 8,
.paritytype = USART_NO_PARITY,
.stopbits = USART_1_STOPBIT,
.channelmode = 0
};
#if BOARD == UC3L_EK
scif_osc32_opt_t opt_osc32 = {
// 2-pin Crystal and high current mode
SCIF_OSC_MODE_2PIN_CRYSTAL_HICUR,
// oscillator startup time
AVR32_SCIF_OSCCTRL32_STARTUP_0_RCOSC,
/*
* select the alternate xin32_2 and xout32_2 for the
* 32kHz crystal oscillator
*/
true,
// disable the 1kHz output
false,
// enable the 32kHz output
true
};
#else
scif_osc32_opt_t opt_osc32 = {
// 2-pin crystal mode
.mode = SCIF_OSC_MODE_2PIN_CRYSTAL,
// startup time
.startup = AVR32_SCIF_OSCCTRL32_STARTUP_0_RCOSC
};
#endif
// Set system clock
sysclk_init();
// Start OSC_32KHZ
scif_start_osc32(&opt_osc32,true);
// Assign GPIO pins to USART0.
gpio_enable_module(USART_GPIO_MAP,
sizeof(USART_GPIO_MAP) / sizeof(USART_GPIO_MAP[0]));
// Initialize USART in RS232 mode
usart_init_rs232(EXAMPLE_USART, &USART_OPTIONS, FPBA);
// Welcome message
usart_write_line(EXAMPLE_USART, "\x1B[2J\x1B[H\r\nATMEL\r\n");
usart_write_line(EXAMPLE_USART, "AVR UC3 - FREQM example\r\n");
#ifndef INTERRUPT_MODE_SUPPORT
uint32_t result;
status_code_t status;
uint32_t duration = 128;
usart_write_line(EXAMPLE_USART, "/*** Normal Mode ***/\r\n");
freqm_enable();
status = freqm_write_config(AVR32_FREQM_REF_OSC32, AVR32_FREQM_CPU,
duration);
if (status == ERR_TIMEOUT) {
usart_write_line(EXAMPLE_USART, "FREQM Module Config Fail!");
while(true);
}
result = clock_measure();
usart_write_line(EXAMPLE_USART, "CPU Clock:\r\n");
display_result(OSC32K_FREQ_HZ, duration, result);
usart_write_line(EXAMPLE_USART, "HSB Clock:\r\n");
freqm_set_clock_source(AVR32_FREQM_HSB);
result = clock_measure();
display_result(OSC32K_FREQ_HZ, duration, result);
usart_write_line(EXAMPLE_USART, "PBA Clock:\r\n");
freqm_set_clock_source(AVR32_FREQM_PBA);
result = clock_measure();
display_result(OSC32K_FREQ_HZ, duration, result);
usart_write_line(EXAMPLE_USART, "PBB Clock:\r\n");
freqm_set_clock_source(AVR32_FREQM_PBB);
result = clock_measure();
display_result(OSC32K_FREQ_HZ, duration, result);
pm_set_clk_domain_div(PM_CLK_DOMAIN_3,PM_CKSEL_DIVRATIO_16);
usart_write_line(EXAMPLE_USART, "PBB Clock(Main clock/16):\r\n");
freqm_set_clock_source(AVR32_FREQM_PBB);
result = clock_measure();
display_result(OSC32K_FREQ_HZ, duration, result);
usart_write_line(EXAMPLE_USART, "Test Complete!\r\n");
while (true) {
/*
* Force a NOP instruction for an eventual placement of a debug
* session breakpoint.
*/
asm("nop\n");
}
#else
INTC_init_interrupts();
INTC_register_interrupt(&freqm_int_handler, AVR32_FREQM_IRQ,
AVR32_INTC_INT0);
freqm_enable_measurement_done_int();
cpu_irq_enable();
usart_write_line(EXAMPLE_USART, "/*** Interrupt Mode ***/\r\n");
uint32_t duration = 128;
uint32_t result;
status_code_t status;
freqm_enable();
status = freqm_write_config(AVR32_FREQM_REF_OSC32, AVR32_FREQM_CPU,
duration);
if (status == ERR_TIMEOUT) {
usart_write_line(EXAMPLE_USART, "FREQM Module Config Fail!");
while(true);
}
freqm_start();
while(true) {
if(flag == 0) {
result =(uint32_t)(((F32)value / duration)
* OSC32K_FREQ_HZ);
usart_write_line(EXAMPLE_USART, "CPU Clock:\r\n");
display_result(OSC32K_FREQ_HZ, duration, result);
usart_write_line(EXAMPLE_USART, "Test Complete!\r\n");
flag = 1;
}
/*
* Force a NOP instruction for an eventual placement of a debug
* session breakpoint.
*/
asm("nop\n");
};
#endif
return 0;
}
