[MCU] 【 HC32F4A0开发板】定时器0测试

TL-LED 2023-2-23 20:45 楼主

这篇来学习下定时器0的配置和应用，通过定时器0来学习，实现1MS定时中断。

一、定时器0时钟

定时器0有两个通道A和B，这里使用定时器0的通道B，时钟选择PCLK1。

PCLK1在主时钟的位置

二、程序部分

2.1、主时钟部分

PCLK1经2分频后得到120MHz频率的时钟。

__WEAKDEF void BSP_CLK_Init(void)
{
    stc_clock_xtal_init_t stcXtalInit;
    stc_clock_pll_init_t stcPLLHInit;

    /* PCLK0, HCLK  Max 240MHz */
    /* PCLK1, PCLK4 Max 120MHz */
    /* PCLK2, PCLK3 Max 60MHz  */
    /* EX BUS Max 120MHz */
    CLK_SetClockDiv(CLK_BUS_CLK_ALL, \
                    (CLK_PCLK0_DIV1 | CLK_PCLK1_DIV2 | CLK_PCLK2_DIV4 | \
                     CLK_PCLK3_DIV4 | CLK_PCLK4_DIV2 | CLK_EXCLK_DIV2 | \
                     CLK_HCLK_DIV1));

    GPIO_AnalogCmd(BSP_XTAL_PORT, BSP_XTAL_IN_PIN | BSP_XTAL_OUT_PIN, ENABLE);
    (void)CLK_XtalStructInit(&stcXtalInit);
    /* Config Xtal and enable Xtal */
    stcXtalInit.u8Mode   = CLK_XTAL_MD_OSC;
    stcXtalInit.u8Drv    = CLK_XTAL_DRV_ULOW;
    stcXtalInit.u8State  = CLK_XTAL_ON;
    stcXtalInit.u8StableTime = CLK_XTAL_STB_2MS;
    (void)CLK_XtalInit(&stcXtalInit);

    (void)CLK_PLLStructInit(&stcPLLHInit);
    /* VCO = (8/1)*120 = 960MHz*/
    stcPLLHInit.u8PLLState = CLK_PLL_ON;
    stcPLLHInit.PLLCFGR = 0UL;
    stcPLLHInit.PLLCFGR_f.PLLM = 1UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLN = 120UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLP = 4UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLQ = 4UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLR = 4UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLSRC = CLK_PLL_SRC_XTAL;
    (void)CLK_PLLInit(&stcPLLHInit);

    /* Highspeed SRAM set to 0 Read/Write wait cycle */
    SRAM_SetWaitCycle(SRAM_SRAMH, SRAM_WAIT_CYCLE0, SRAM_WAIT_CYCLE0);

    /* SRAM1_2_3_4_backup set to 1 Read/Write wait cycle */
    SRAM_SetWaitCycle((SRAM_SRAM123 | SRAM_SRAM4 | SRAM_SRAMB), SRAM_WAIT_CYCLE1, SRAM_WAIT_CYCLE1);

    /* 0-wait @ 40MHz */
    (void)EFM_SetWaitCycle(EFM_WAIT_CYCLE5);

    /* 4 cycles for 200 ~ 250MHz */
    GPIO_SetReadWaitCycle(GPIO_RD_WAIT4);

    CLK_SetSysClockSrc(CLK_SYSCLK_SRC_PLL);
}

2.2、timer0.c

#include "main.h"
#include "led.h"

/* TMR0 unit and channel definition */
#define TMR0_UNIT                       (CM_TMR0_1)
#define TMR0_CH                         (TMR0_CH_B)
#define TMR0_CH_INT                     (TMR0_INT_CMP_B)
#define TMR0_CH_FLAG                    (TMR0_FLAG_CMP_B)
#define TMR0_INT_SRC                    (INT_SRC_TMR0_1_CMP_B)
#define TMR0_IRQn                       (INT006_IRQn)

void init_timer0(void)
{
    stc_tmr0_init_t stcTmr0Init;
    stc_irq_signin_config_t stcIrqSignConfig;

    (void)TMR0_StructInit(&stcTmr0Init);
    stcTmr0Init.u32ClockSrc     = TMR0_CLK_SRC_INTERN_CLK;
    stcTmr0Init.u32ClockDiv     = TMR0_CLK_DIV8;
    stcTmr0Init.u32Func         = TMR0_FUNC_CMP;
    stcTmr0Init.u16CompareValue = 15000;
    (void)TMR0_Init(TMR0_UNIT, TMR0_CH, &stcTmr0Init);

    TMR0_HWStopCondCmd(TMR0_UNIT, TMR0_CH, ENABLE);
    TMR0_IntCmd(TMR0_UNIT, TMR0_CH_INT, ENABLE);
	
    stcIrqSignConfig.enIntSrc    = TMR0_INT_SRC;
    stcIrqSignConfig.enIRQn      = TMR0_IRQn;
    stcIrqSignConfig.pfnCallback = &TMR0_CompareIrqCallback;
    (void)INTC_IrqSignIn(&stcIrqSignConfig);
    NVIC_ClearPendingIRQ(stcIrqSignConfig.enIRQn);
    NVIC_SetPriority(stcIrqSignConfig.enIRQn, DDL_IRQ_PRIO_DEFAULT);
    NVIC_EnableIRQ(stcIrqSignConfig.enIRQn);
		
    TMR0_Start(TMR0_UNIT, TMR0_CH);	
}

定时器输入时钟的选择

a> 时钟选择内部的PCLK1时钟

b> 分频选择分频，输入时钟的内部时钟=120/8=15MHz

c> 输出比较功能

d> 实现1ms的比较值=15000，15个时钟是1us，15*1000实现1MS；

2.3、定时器0中断

 uint32_t t0_cnt=0;
static void TMR0_CompareIrqCallback(void)
{	
		t0_cnt++;
		if(t0_cnt>99)
		{
			t0_cnt=0;
			BSP_LED_Toggle(LED_BLUE);
		}
    
		led1_tog();
    TMR0_ClearStatus(TMR0_UNIT, TMR0_CH_FLAG);
}

三、输出波形

测量led1(PE2)的波形：