main.c File Reference

#include "fw_hal.h"
#include "voice.h"

Go to the source code of this file.

Functions
void	PWM_Init ()
void	Timer0_Init ()
	INTERRUPT (Timer0_Routine, EXTI_VectTimer0)
void	main (void)

Variables
uint8_t	dc = 0
uint16_t	voice_pos = 0
uint16_t	voice_size = 27451

Function Documentation

INTERRUPT()

INTERRUPT	(	Timer0_Routine	,
		EXTI_VectTimer0
	)

Definition at line 72 of file main.c.

{
    uint8_t dc;
    dc = voice_bulk[voice_pos++];
    PWMA_PWM1_SetCaptureCompareValue(dc);
    if (voice_pos == voice_size) voice_pos = 0;
}

main()

void main

(

void

)

Definition at line 80 of file main.c.

{
    SYS_SetClock();
    PWM_Init();
    Timer0_Init();
 
    while(1);
}

PWM_Init()

void PWM_Init

(

)

Definition at line 28 of file main.c.

{
    // Set GPIO pins output mode P10 -> PWMA.1P
    GPIO_P1_SetMode(GPIO_Pin_0, GPIO_Mode_Output_PP);
    // Turn off PWMA.1 before change its mode
    PWMA_PWM1_SetPortState(HAL_State_OFF);
    PWMA_PWM1N_SetPortState(HAL_State_OFF);
    // Set PWMA.1 port direction output
    PWMA_PWM1_SetPortDirection(PWMB_PortDirOut);
    // Set PWMA.1 output low voltage when counter is less than target value
    PWMA_PWM1_ConfigOutputMode(PWM_OutputMode_PWM_HighIfLess);
    // Enable comparison value preload to make duty cycle changing smooth
    PWMA_PWM1_SetComparePreload(HAL_State_ON);
    // Turn on PWMA.1
    PWMA_PWM1_SetPortState(HAL_State_ON);
 
    // Set PWM frequency to 16kHz, Fpwm = SYSCLK / (PWMx_PSCR + 1) / (PWMx_ARR + 1)
    // You will hear obvious noise if PWM frequency is less than 12kHz
    PWMA_SetPrescaler(8);
    // PWM width = Period + 1 (side alignment), or AutoReloadPeriod * 2 (center alignment)
    PWMA_SetPeriod(0xFF);
    // Counter direction, down:from [PWMA_ARRH,PWMA_ARRL] to 0
    PWMA_SetCounterDirection(PWM_CounterDirection_Down);
    // Enable preload on reload-period
    PWMA_SetAutoReloadPreload(HAL_State_ON);
    // Enable output on PWMA.1P
    PWMA_SetPinOutputState(PWM_Pin_1, HAL_State_ON);
    // Set PWMA.1 alternative ports to P1.0 and P1.1
    PWMA_PWM1_SetPort(PWMA_PWM1_AlterPort_P10_P11);
    // Enable overall output
    PWMA_SetOverallState(HAL_State_ON);
    // Start counter
    PWMA_SetCounterState(HAL_State_ON);
}

Timer0_Init()

void Timer0_Init

(

)

Definition at line 63 of file main.c.

{
    TIM_Timer0_Config(HAL_State_ON, TIM_TimerMode_16BitAuto, 8000);
    EXTI_Timer0_SetIntState(HAL_State_ON);
    EXTI_Timer0_SetIntPriority(EXTI_IntPriority_High);
    EXTI_Global_SetIntState(HAL_State_ON);
    TIM_Timer0_SetRunState(HAL_State_ON);
}

Variable Documentation

dc

uint8_t dc = 0

Demo: DAC voice output simulation Board: STC8H3K32 (types with flash size >= 32KB)

P1.0 -> 200R -> Speaker + GND -> Speaker -

Definition at line 25 of file main.c.

voice_pos

uint16_t voice_pos = 0

Definition at line 26 of file main.c.

voice_size

uint16_t voice_size = 27451

Definition at line 26 of file main.c.