#include <stdint.h>

#include <stdbool.h>

#include "efm32gg.h"

/*

TODO calculate the appropriate sample period for the sound wave(s)

you want to generate. The core clock (which the timer clock is derived

from) runs at 14 MHz by default. Also remember that the timer counter

registers are 16 bits.

*/

/* The period between sound samples, in clock cycles */

#define SAMPLE_PERIOD 317

/* Declaration of peripheral setup functions */

void setupTimer(uint32_t period);

void setupDAC();

void setupNVIC();

/* Your code will start executing here */

int main(void)

{

/* Call the peripheral setup functions */

setupGPIO();

setupDAC();

setupTimer(SAMPLE_PERIOD);

/* Enable interrupt handling */

*SCR = 2;

setupNVIC();

__asm volatile("wfi");

/* TODO for higher energy efficiency, sleep while waiting for interrupts

instead of infinite loop for busy-waiting

*/

while(1);

return 0;

}

void setupNVIC()

{

*ISER0 |= (1 << 12);

*ISER0 = 0x802;

// *ISER0 |= (1 << 11);

// *ISER0 |= (1 << 1);

/* TODO use the NVIC ISERx registers to enable handling of interrupt(s)

remember two things are necessary for interrupt handling:

- the peripheral must generate an interrupt signal

- the NVIC must be configured to make the CPU handle the signal

You will need TIMER1, GPIO odd and GPIO even interrupt handling for this

assignment.

*/

}

/* if other interrupt handlers are needed, use the following names:

NMI_Handler

HardFault_Handler

MemManage_Handler

BusFault_Handler

UsageFault_Handler

Reserved7_Handler

Reserved8_Handler

Reserved9_Handler

Reserved10_Handler

SVC_Handler

DebugMon_Handler

Reserved13_Handler

PendSV_Handler

SysTick_Handler

DMA_IRQHandler

GPIO_EVEN_IRQHandler

TIMER0_IRQHandler

USART0_RX_IRQHandler

USART0_TX_IRQHandler

USB_IRQHandler

ACMP0_IRQHandler

ADC0_IRQHandler

DAC0_IRQHandler

I2C0_IRQHandler

I2C1_IRQHandler

GPIO_ODD_IRQHandler

TIMER1_IRQHandler

TIMER2_IRQHandler

TIMER3_IRQHandler

USART1_RX_IRQHandler

USART1_TX_IRQHandler

LESENSE_IRQHandler

USART2_RX_IRQHandler

USART2_TX_IRQHandler

UART0_RX_IRQHandler

UART0_TX_IRQHandler

UART1_RX_IRQHandler

UART1_TX_IRQHandler

LEUART0_IRQHandler

LEUART1_IRQHandler

LETIMER0_IRQHandler

PCNT0_IRQHandler

PCNT1_IRQHandler

PCNT2_IRQHandler

RTC_IRQHandler

BURTC_IRQHandler

CMU_IRQHandler

VCMP_IRQHandler

LCD_IRQHandler

MSC_IRQHandler

AES_IRQHandler

EBI_IRQHandler

EMU_IRQHandler

*/