M451的定时器的寄存器的这一章节，相信很多人都清楚明白了，但还是有必要说一说的
/** * @brief Timer0 IRQ * * @param None * * @return None * * @details The Timer0 default IRQ, declared in startup_M451Series.s. */ void TMR0_IRQHandler(void) { if(TIMER_GetIntFlag(TIMER0) == 1) { /* Clear Timer0 time-out interrupt flag */ TIMER_ClearIntFlag(TIMER0); g_au32TMRINTCount[0]++; } } /** * @brief Timer1 IRQ * * @param None * * @return None * * @details The Timer1 default IRQ, declared in startup_M451Series.s. */ void TMR1_IRQHandler(void) { if(TIMER_GetIntFlag(TIMER1) == 1) { /* Clear Timer1 time-out interrupt flag */ TIMER_ClearIntFlag(TIMER1); g_au32TMRINTCount[1]++; } } /** * @brief Timer2 IRQ * * @param None * * @return None * * @details The Timer2 default IRQ, declared in startup_M451Series.s. */ void TMR2_IRQHandler(void) { if(TIMER_GetIntFlag(TIMER2) == 1) { /* Clear Timer2 time-out interrupt flag */ TIMER_ClearIntFlag(TIMER2); g_au32TMRINTCount[2]++; } } /** * @brief Timer3 IRQ * * @param None * * @return None * * @details The Timer3 default IRQ, declared in startup_M451Series.s. */ void TMR3_IRQHandler(void) { if(TIMER_GetIntFlag(TIMER3) == 1) { /* Clear Timer3 time-out interrupt flag */ TIMER_ClearIntFlag(TIMER3); g_au32TMRINTCount[3]++; } } void SYS_Init(void) { /*---------------------------------------------------------------------------------------------------------*/ /* Init System Clock */ /*---------------------------------------------------------------------------------------------------------*/ /* Enable HIRC clock */ CLK->PWRCTL |= CLK_PWRCTL_HIRCEN_Msk; /* Waiting for HIRC clock ready */ while(!(CLK->STATUS & CLK_STATUS_HIRCSTB_Msk)); /* Switch HCLK clock source to HIRC */ CLK->CLKSEL0 = CLK_CLKSEL0_HCLKSEL_HIRC; /* Set PLL to Power-down mode and PLLSTB bit in CLK_STATUS register will be cleared by hardware.*/ CLK->PLLCTL |= CLK_PLLCTL_PD_Msk; /* Enable HXT */ CLK->PWRCTL |= CLK_PWRCTL_HXTEN_Msk; /* Enable PLL and Set PLL frequency */ CLK->PLLCTL = PLLCON_SETTING; /* Waiting for clock ready */ while(!(CLK->STATUS & CLK_STATUS_PLLSTB_Msk)); while(!(CLK->STATUS & CLK_STATUS_HXTSTB_Msk)); /* Switch STCLK source to HCLK/2 and HCLK clock source to PLL */ CLK->CLKSEL0 = CLK_CLKSEL0_STCLKSEL_HCLK_DIV2 | CLK_CLKSEL0_HCLKSEL_PLL; /* Enable peripheral clock */ CLK->APBCLK0 = CLK_APBCLK0_UART0CKEN_Msk | CLK_APBCLK0_TMR0CKEN_Msk | CLK_APBCLK0_TMR1CKEN_Msk | CLK_APBCLK0_TMR2CKEN_Msk | CLK_APBCLK0_TMR3CKEN_Msk; /* Peripheral clock source */ CLK->CLKSEL1 = CLK_CLKSEL1_UARTSEL_PLL | CLK_CLKSEL1_TMR0SEL_HXT | CLK_CLKSEL1_TMR1SEL_PCLK0 | CLK_CLKSEL1_TMR2SEL_HIRC | CLK_CLKSEL1_TMR3SEL_HXT; /* Update System Core Clock */ /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */ SystemCoreClockUpdate(); /*---------------------------------------------------------------------------------------------------------*/ /* Init I/O Multi-function */ /*---------------------------------------------------------------------------------------------------------*/ /* Set PD multi-function pins for UART0 RXD, TXD */ SYS->GPD_MFPL = SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD; } void UART0_Init(void) { /*---------------------------------------------------------------------------------------------------------*/ /* Init UART */ /*---------------------------------------------------------------------------------------------------------*/ /* Reset UART module */ SYS->IPRST1 |= SYS_IPRST1_UART0RST_Msk; SYS->IPRST1 &= ~SYS_IPRST1_UART0RST_Msk; /* Configure UART0 and set UART0 Baudrate */ UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(PllClock, 115200); UART0->LINE = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1; } /*---------------------------------------------------------------------------------------------------------*/ /* MAIN function */ /*---------------------------------------------------------------------------------------------------------*/ int main(void) { volatile uint32_t u32InitCount; /* Unlock protected registers */ SYS_UnlockReg(); /* Init System, peripheral clock and multi-function I/O */ SYS_Init(); /* Lock protected registers */ SYS_LockReg(); /* Init UART0 for printf */ UART0_Init(); printf(" CPU @ %d Hz ", SystemCoreClock); printf("+--------------------------------------------+ "); printf("| Timer Periodic Interrupt Sample Code | "); printf("+--------------------------------------------+ "); printf("# Timer0 Settings: "); printf(" - Clock source is HXT "); printf(" - Time-out frequency is 1 Hz "); printf(" - Periodic mode "); printf(" - Interrupt enable "); printf("# Timer1 Settings: "); printf(" - Clock source is HCLK "); printf(" - Time-out frequency is 2 Hz "); printf(" - Periodic mode "); printf(" - Interrupt enable "); printf("# Timer2 Settings: "); printf(" - Clock source is HIRC "); printf(" - Time-out frequency is 4 Hz "); printf(" - Periodic mode "); printf(" - Interrupt enable "); printf("# Timer3 Settings: "); printf(" - Clock source is HXT "); printf(" - Time-out frequency is 8 Hz "); printf(" - Periodic mode "); printf(" - Interrupt enable "); printf("# Check Timer0 ~ Timer3 interrupt counts are reasonable or not. "); /* Open Timer0 in periodic mode, enable interrupt and 1 interrupt tick per second */ TIMER0->CMP = __HXT; TIMER0->CTL = TIMER_CTL_INTEN_Msk | TIMER_PERIODIC_MODE; TIMER_SET_PRESCALE_VALUE(TIMER0, 0); /* Open Timer1 in periodic mode, enable interrupt and 2 interrupt ticks per second */ TIMER1->CMP = ((SystemCoreClock / 4) / 2); TIMER1->CTL = TIMER_CTL_INTEN_Msk | TIMER_PERIODIC_MODE; TIMER_SET_PRESCALE_VALUE(TIMER1, 3); /* Open Timer2 in periodic mode, enable interrupt and 4 interrupt ticks per second */ TIMER2->CMP = ((__HIRC / 1) / 4); TIMER2->CTL = TIMER_CTL_INTEN_Msk | TIMER_PERIODIC_MODE; TIMER_SET_PRESCALE_VALUE(TIMER2, 0); /* Open Timer3 in periodic mode, enable interrupt and 8 interrupt ticks per second */ TIMER3->CMP = ((__HXT / 1) / 8); TIMER3->CTL = TIMER_CTL_INTEN_Msk | TIMER_PERIODIC_MODE; TIMER_SET_PRESCALE_VALUE(TIMER3, 0); /* Enable Timer0 ~ Timer3 NVIC */ NVIC_EnableIRQ(TMR0_IRQn); NVIC_EnableIRQ(TMR1_IRQn); NVIC_EnableIRQ(TMR2_IRQn); NVIC_EnableIRQ(TMR3_IRQn); /* Clear Timer0 ~ Timer3 interrupt counts to 0 */ g_au32TMRINTCount[0] = g_au32TMRINTCount[1] = g_au32TMRINTCount[2] = g_au32TMRINTCount[3] = 0; u32InitCount = g_au32TMRINTCount[0]; /* Start Timer0 ~ Timer3 counting */ TIMER_Start(TIMER0); TIMER_Start(TIMER1); TIMER_Start(TIMER2); TIMER_Start(TIMER3); /* Check Timer0 ~ Timer3 interrupt counts */ printf("# Timer interrupt counts : "); while(u32InitCount < 20) { if(g_au32TMRINTCount[0] != u32InitCount) { printf(" TMR0:%3d TMR1:%3d TMR2:%3d TMR3:%3d ", g_au32TMRINTCount[0], g_au32TMRINTCount[1], g_au32TMRINTCount[2], g_au32TMRINTCount[3]); u32InitCount = g_au32TMRINTCount[0]; if((g_au32TMRINTCount[1] > (g_au32TMRINTCount[0] * 2 + 1)) || (g_au32TMRINTCount[1] < (g_au32TMRINTCount[0] * 2 - 1)) || (g_au32TMRINTCount[2] > (g_au32TMRINTCount[0] * 4 + 1)) || (g_au32TMRINTCount[2] < (g_au32TMRINTCount[0] * 4 - 1)) || (g_au32TMRINTCount[3] > (g_au32TMRINTCount[0] * 8 + 1)) || (g_au32TMRINTCount[3] < (g_au32TMRINTCount[0] * 8 - 1))) { printf("*** FAIL *** "); while(1); } } } printf("*** PASS *** "); while(1); } /*** (C) COPYRIGHT 2013~2015 Nuvoton Technology Corp. ***/
typedef struct { /** * @var TIMER_T::CTL * Offset: 0x00 Timer Control and Status Register * --------------------------------------------------------------------------------------------------- * |Bits |Field |Descriptions * | :----: | :----: | :---- | * |[7:0] |PSC |Prescale Counter * | | |Timer input clock or event source is divided by (PSC+1) before it is fed to the timer up counter. * | | |If this field is 0 (PSC = 0), then there is no scaling. * |[17] |WKTKEN |Wake-Up Touch-Key Scan Enable Bit * | | |If this bit is set to 1, timer time-out interrupt in Power-down mode can be triggered Touch-Key start scan. * | | |0 = Timer time-out interrupt signal trigger Touch-Key start scan Disabled. * | | |1 = Timer time-out interrupt signal trigger Touch-Key start scan Enabled. * | | |Note: This bit is only available in TIMER0_CTL. * |[18] |TRGSSEL |Trigger Source Select Bit * | | |This bit is used to select trigger source is form Timer time-out interrupt signal or capture interrupt signal. * | | |0 = Timer time-out interrupt signal is used to trigger PWM, EADC and DAC. * | | |1 = Capture interrupt signal is used to trigger PWM, EADC and DAC. * |[19] |TRGPWM |Trigger PWM Enable Bit * | | |If this bit is set to 1, timer time-out interrupt or capture interrupt can be triggered PWM. * | | |0 = Timer interrupt trigger PWM Disabled. * | | |1 = Timer interrupt trigger PWM Enabled. * | | |Note: If TRGSSEL (TIMERx_CTL[18]) = 0, time-out interrupt signal will trigger PWM. * | | |If TRGSSEL (TIMERx_CTL[18]) = 1, capture interrupt signal will trigger PWM. * |[20] |TRGDAC |Trigger DAC Enable Bit * | | |If this bit is set to 1, timer time-out interrupt or capture interrupt can be triggered DAC. * | | |0 = Timer interrupt trigger DAC Disabled. * | | |1 = Timer interrupt trigger DAC Enabled. * | | |Note: If TRGSSEL (TIMERx_CTL[18]) = 0, time-out interrupt signal will trigger DAC. * | | |If TRGSSEL (TIMERx_CTL[18]) = 1, capture interrupt signal will trigger DAC. * |[21] |TRGEADC |Trigger EADC Enable Bit * | | |If this bit is set to 1, timer time-out interrupt or capture interrupt can be triggered EADC. * | | |0 = Timer interrupt trigger EADC Disabled. * | | |1 = Timer interrupt trigger EADC Enabled. * | | |Note: If TRGSSEL (TIMERx_CTL[18]) = 0, time-out interrupt signal will trigger EADC. * | | |If TRGSSEL (TIMERx_CTL[18]) = 1, capture interrupt signal will trigger EADC. * |[22] |TGLPINSEL |Toggle-Output Pin Select * | | |0 = Toggle mode output to Tx_OUT (Timer Event Counter Pin). * | | |1 = Toggle mode output to Tx_EXT(Timer External Capture Pin). * |[23] |WKEN |Wake-Up Function Enable Bit * | | |If this bit is set to 1, while timer interrupt flag TIF (TIMERx_INTSTS[0]) is 1 and INTEN (TIMERx_CTL[29]) is enabled, the timer interrupt signal will generate a wake-up trigger event to CPU. * | | |0 = Wake-up function Disabled if timer interrupt signal generated. * | | |1 = Wake-up function Enabled if timer interrupt signal generated. * |[24] |EXTCNTEN |Event Counter Mode Enable Bit * | | |This bit is for external counting pin function enabled. * | | |0 = Event counter mode Disabled. * | | |1 = Event counter mode Enabled. * | | |Note: When timer is used as an event counter, this bit should be set to 1 and select HCLK as timer clock source. * |[25] |ACTSTS |Timer Active Status Bit (Read Only) * | | |This bit indicates the 24-bit up counter status. * | | |0 = 24-bit up counter is not active. * | | |1 = 24-bit up counter is active. * |[26] |RSTCNT |Timer Counter Reset Bit * | | |Setting this bit will reset the 24-bit up counter value CNT (TIMERx_CNT[23:0]) and also force CNTEN (TIMERx_CTL[30]) to 0 if ACTSTS (TIMERx_CTL[25]) is 1. * | | |0 = No effect. * | | |1 = Reset internal 8-bit prescale counter, 24-bit up counter value and CNTEN bit. * |[28:27] |OPMODE |Timer Counting Mode Select * | | |00 = The Timer controller is operated in One-shot mode. * | | |01 = The Timer controller is operated in Periodic mode. * | | |10 = The Timer controller is operated in Toggle-output mode. * | | |11 = The Timer controller is operated in Continuous Counting mode. * |[29] |INTEN |Timer Interrupt Enable Bit * | | |0 = Timer Interrupt Disabled. * | | |1 = Timer Interrupt Enabled. * | | |Note: If this bit is enabled, when the timer interrupt flag TIF is set to 1, the timer interrupt signal is generated and inform to CPU. * |[30] |CNTEN |Timer Counting Enable Bit * | | |0 = Stops/Suspends counting. * | | |1 = Starts counting. * | | |Note1: In stop status, and then set CNTEN to 1 will enable the 24-bit up counter to keep counting from the last stop counting value. * | | |Note2: This bit is auto-cleared by hardware in one-shot mode (TIMER_CTL[28:27] = 00) when the timer interrupt flag TIF (TIMERx_INTSTS[0]) is generated. * |[31] |ICEDEBUG |ICE Debug Mode Acknowledge Disable * | | |0 = ICE debug mode acknowledgement effects TIMER counting. * | | |TIMER counter will be held while CPU is held by ICE. * | | |1 = ICE debug mode acknowledgement Disabled. * | | |TIMER counter will keep going no matter CPU is held by ICE or not. * @var TIMER_T::CMP * Offset: 0x04 Timer Compare Register * --------------------------------------------------------------------------------------------------- * |Bits |Field |Descriptions * | :----: | :----: | :---- | * |[23:0] |CMPDAT |Timer Compared Value * | | |CMPDAT is a 24-bit compared value register. * | | |When the internal 24-bit up counter value is equal to CMPDAT value, the TIF (TIMERx_INTSTS[0] Timer Interrupt Flag) will set to 1. * | | |Time-out period = (Period of timer clock input) * (8-bit PSC + 1) * (24-bit CMPDAT). * | | |Note1: Never write 0x0 or 0x1 in CMPDAT field, or the core will run into unknown state. * | | |Note2: When timer is operating at continuous counting mode, the 24-bit up counter will keep counting continuously even if user writes a new value into CMPDAT field. * | | |But if timer is operating at other modes, the 24-bit up counter will restart counting from 0 and using newest CMPDAT value to be the timer compared value while user writes a new value into CMPDAT field. * @var TIMER_T::INTSTS * Offset: 0x08 Timer Interrupt Status Register * --------------------------------------------------------------------------------------------------- * |Bits |Field |Descriptions * | :----: | :----: | :---- | * |[0] |TIF |Timer Interrupt Flag * | | |This bit indicates the interrupt flag status of Timer while 24-bit timer up counter CNT (TIMERx_CNT[23:0]) value reaches to CMPDAT (TIMERx_CMP[23:0]) value. * | | |0 = No effect. * | | |1 = CNT value matches the CMPDAT value. * | | |Note: This bit is cleared by writing 1 to it. * |[1] |TWKF |Timer Wake-Up Flag * | | |This bit indicates the interrupt wake-up flag status of timer. * | | |0 = Timer does not cause CPU wake-up. * | | |1 = CPU wake-up from Idle or Power-down mode if timer time-out interrupt signal generated. * | | |Note: This bit is cleared by writing 1 to it. * @var TIMER_T::CNT * Offset: 0x0C Timer Data Register * --------------------------------------------------------------------------------------------------- * |Bits |Field |Descriptions * | :----: | :----: | :---- | * |[23:0] |CNT |Timer Data Register * | | |This field can be reflected the internal 24-bit timer counter value or external event input counter value from Tx_CNT (x=0~3) pin. * | | |If EXTCNTEN (TIMERx_CTL[24] ) is 0, user can read CNT value for getting current 24- bit counter value . * | | |If EXTCNTEN (TIMERx_CTL[24] ) is 1, user can read CNT value for getting current 24- bit event input counter value. * @var TIMER_T::CAP * Offset: 0x10 Timer Capture Data Register * --------------------------------------------------------------------------------------------------- * |Bits |Field |Descriptions * | :----: | :----: | :---- | * |[23:0] |CAPDAT |Timer Capture Data Register * | | |When CAPEN (TIMERx_EXTCTL[3]) bit is set, CAPFUNCS (TIMERx_EXTCTL[4]) bit is 0, and a transition on Tx_EXT pin matched the CAPEDGE (TIMERx_EXTCTL[2:1]) setting, CAPIF (TIMERx_EINTSTS[0]) will set to 1 and the current timer counter value CNT (TIMERx_CNT[23:0]) will be auto-loaded into this CAPDAT field. * @var TIMER_T::EXTCTL * Offset: 0x14 Timer External Control Register * --------------------------------------------------------------------------------------------------- * |Bits |Field |Descriptions * | :----: | :----: | :---- | * |[0] |CNTPHASE |Timer External Count Phase * | | |This bit indicates the detection phase of external counting pin Tx_CNT (x= 0~3). * | | |0 = A Falling edge of external counting pin will be counted. * | | |1 = A Rising edge of external counting pin will be counted. * |[2:1] |CAPEDGE |Timer External Capture Pin Edge Detect * | | |00 = A Falling edge on Tx_EXT (x= 0~3) pin will be detected. * | | |01 = A Rising edge on Tx_EXT (x= 0~3) pin will be detected. * | | |10 = Either Rising or Falling edge on Tx_EXT (x= 0~3) pin will be detected. * | | |11 = Reserved. * |[3] |CAPEN |Timer External Capture Pin Enable * | | |This bit enables the Tx_EXT pin. * | | |0 =Tx_EXT (x= 0~3) pin Disabled. * | | |1 =Tx_EXT (x= 0~3) pin Enabled. * |[4] |CAPFUNCS |Capture Function Selection * | | |0 = External Capture Mode Enabled. * | | |1 = External Reset Mode Enabled. * | | |Note1: When CAPFUNCS is 0, transition on Tx_EXT (x= 0~3) pin is using to save the 24-bit timer counter value. * | | |Note2: When CAPFUNCS is 1, transition on Tx_EXT (x= 0~3) pin is using to reset the 24-bit timer counter value. * |[5] |CAPIEN |Timer External Capture Interrupt Enable * | | |0 = Tx_EXT (x= 0~3) pin detection Interrupt Disabled. * | | |1 = Tx_EXT (x= 0~3) pin detection Interrupt Enabled. * | | |Note: CAPIEN is used to enable timer external interrupt. * | | |If CAPIEN enabled, timer will rise an interrupt when CAPIF (TIMERx_EINTSTS[0]) is 1. * | | |For example, while CAPIEN = 1, CAPEN = 1, and CAPEDGE = 00, a 1 to 0 transition on the Tx_EXT pin will cause the CAPIF to be set then the interrupt signal is generated and sent to NVIC to inform CPU. * |[6] |CAPDBEN |Timer External Capture Pin De-Bounce Enable * | | |0 = Tx_EXT (x= 0~3) pin de-bounce Disabled. * | | |1 = Tx_EXT (x= 0~3) pin de-bounce Enabled. * | | |Note: If this bit is enabled, the edge detection of Tx_EXT pin is detected with de-bounce circuit. * |[7] |CNTDBEN |Timer Counter Pin De-Bounce Enable * | | |0 = Tx_CNT (x= 0~3) pin de-bounce Disabled. * | | |1 = Tx_CNT (x= 0~3) pin de-bounce Enabled. * | | |Note: If this bit is enabled, the edge detection of Tx_CNT pin is detected with de-bounce circuit. * @var TIMER_T::EINTSTS * Offset: 0x18 Timer External Interrupt Status Register * --------------------------------------------------------------------------------------------------- * |Bits |Field |Descriptions * | :----: | :----: | :---- | * |[0] |CAPIF |Timer External Capture Interrupt Flag * | | |This bit indicates the timer external capture interrupt flag status. * | | |0 = Tx_EXT (x= 0~3) pin interrupt did not occur. * | | |1 = Tx_EXT (x= 0~3) pin interrupt occurred. * | | |Note1: This bit is cleared by writing 1 to it. * | | |Note2: When CAPEN (TIMERx_EXTCTL[3]) bit is set, CAPFUNCS (TIMERx_EXTCTL[4]) bit is 0, and a transition on Tx_EXT (x= 0~3) pin matched the CAPEDGE (TIMERx_EXTCTL[2:1]) setting, this bit will set to 1 by hardware. * | | |Note3: There is a new incoming capture event detected before CPU clearing the CAPIF status. * | | |If the above condition occurred, the Timer will keep register TIMERx_CAP unchanged and drop the new capture value. */ __IO uint32_t CTL; /* Offset: 0x00 Timer Control and Status Register */ __IO uint32_t CMP; /* Offset: 0x04 Timer Compare Register */ __IO uint32_t INTSTS; /* Offset: 0x08 Timer Interrupt Status Register */ __I uint32_t CNT; /* Offset: 0x0C Timer Data Register */ __I uint32_t CAP; /* Offset: 0x10 Timer Capture Data Register */ __IO uint32_t EXTCTL; /* Offset: 0x14 Timer External Control Register */ __IO uint32_t EINTSTS; /* Offset: 0x18 Timer External Interrupt Status Register */ } TIMER_T; /** @addtogroup TMR_CONST TMR Bit Field Definition Constant Definitions for TMR Controller @{ */ #define TIMER_CTL_PSC_Pos (0) /*!< TIMER_T::CTL: PSC Position */ #define TIMER_CTL_PSC_Msk (0xfful << TIMER_CTL_PSC_Pos) /*!< TIMER_T::CTL: PSC Mask */ #define TIMER_CTL_WKTKEN_Pos (17) /*!< TIMER_T::CTL: WKTKEN Position */ #define TIMER_CTL_WKTKEN_Msk (0x1ul << TIMER_CTL_WKTKEN_Pos) /*!< TIMER_T::CTL: WKTKEN Mask */ #define TIMER_CTL_TRGSSEL_Pos (18) /*!< TIMER_T::CTL: TRGSSEL Position */ #define TIMER_CTL_TRGSSEL_Msk (0x1ul << TIMER_CTL_TRGSSEL_Pos) /*!< TIMER_T::CTL: TRGSSEL Mask */ #define TIMER_CTL_TRGPWM_Pos (19) /*!< TIMER_T::CTL: TRGPWM Position */ #define TIMER_CTL_TRGPWM_Msk (0x1ul << TIMER_CTL_TRGPWM_Pos) /*!< TIMER_T::CTL: TRGPWM Mask */ #define TIMER_CTL_TRGDAC_Pos (20) /*!< TIMER_T::CTL: TRGDAC Position */ #define TIMER_CTL_TRGDAC_Msk (0x1ul << TIMER_CTL_TRGDAC_Pos) /*!< TIMER_T::CTL: TRGDAC Mask */ #define TIMER_CTL_TRGEADC_Pos (21) /*!< TIMER_T::CTL: TRGEADC Position */ #define TIMER_CTL_TRGEADC_Msk (0x1ul << TIMER_CTL_TRGEADC_Pos) /*!< TIMER_T::CTL: TRGEADC Mask */ #define TIMER_CTL_TGLPINSEL_Pos (22) /*!< TIMER_T::CTL: TGLPINSEL Position */ #define TIMER_CTL_TGLPINSEL_Msk (0x1ul << TIMER_CTL_TGLPINSEL_Pos) /*!< TIMER_T::CTL: TGLPINSEL Mask */ #define TIMER_CTL_WKEN_Pos (23) /*!< TIMER_T::CTL: WKEN Position */ #define TIMER_CTL_WKEN_Msk (0x1ul << TIMER_CTL_WKEN_Pos) /*!< TIMER_T::CTL: WKEN Mask */ #define TIMER_CTL_EXTCNTEN_Pos (24) /*!< TIMER_T::CTL: EXTCNTEN Position */ #define TIMER_CTL_EXTCNTEN_Msk (0x1ul << TIMER_CTL_EXTCNTEN_Pos) /*!< TIMER_T::CTL: EXTCNTEN Mask */ #define TIMER_CTL_ACTSTS_Pos (25) /*!< TIMER_T::CTL: ACTSTS Position */ #define TIMER_CTL_ACTSTS_Msk (0x1ul << TIMER_CTL_ACTSTS_Pos) /*!< TIMER_T::CTL: ACTSTS Mask */ #define TIMER_CTL_RSTCNT_Pos (26) /*!< TIMER_T::CTL: RSTCNT Position */ #define TIMER_CTL_RSTCNT_Msk (0x1ul << TIMER_CTL_RSTCNT_Pos) /*!< TIMER_T::CTL: RSTCNT Mask */ #define TIMER_CTL_OPMODE_Pos (27) /*!< TIMER_T::CTL: OPMODE Position */ #define TIMER_CTL_OPMODE_Msk (0x3ul << TIMER_CTL_OPMODE_Pos) /*!< TIMER_T::CTL: OPMODE Mask */ #define TIMER_CTL_INTEN_Pos (29) /*!< TIMER_T::CTL: INTEN Position */ #define TIMER_CTL_INTEN_Msk (0x1ul << TIMER_CTL_INTEN_Pos) /*!< TIMER_T::CTL: INTEN Mask */ #define TIMER_CTL_CNTEN_Pos (30) /*!< TIMER_T::CTL: CNTEN Position */ #define TIMER_CTL_CNTEN_Msk (0x1ul << TIMER_CTL_CNTEN_Pos) /*!< TIMER_T::CTL: CNTEN Mask */ #define TIMER_CTL_ICEDEBUG_Pos (31) /*!< TIMER_T::CTL: ICEDEBUG Position */ #define TIMER_CTL_ICEDEBUG_Msk (0x1ul << TIMER_CTL_ICEDEBUG_Pos) /*!< TIMER_T::CTL: ICEDEBUG Mask */ #define TIMER_CMP_CMPDAT_Pos (0) /*!< TIMER_T::CMP: CMPDAT Position */ #define TIMER_CMP_CMPDAT_Msk (0xfffffful << TIMER_CMP_CMPDAT_Pos) /*!< TIMER_T::CMP: CMPDAT Mask */ #define TIMER_INTSTS_TIF_Pos (0) /*!< TIMER_T::INTSTS: TIF Position */ #define TIMER_INTSTS_TIF_Msk (0x1ul << TIMER_INTSTS_TIF_Pos) /*!< TIMER_T::INTSTS: TIF Mask */ #define TIMER_INTSTS_TWKF_Pos (1) /*!< TIMER_T::INTSTS: TWKF Position */ #define TIMER_INTSTS_TWKF_Msk (0x1ul << TIMER_INTSTS_TWKF_Pos) /*!< TIMER_T::INTSTS: TWKF Mask */ #define TIMER_CNT_CNT_Pos (0) /*!< TIMER_T::CNT: CNT Position */ #define TIMER_CNT_CNT_Msk (0xfffffful << TIMER_CNT_CNT_Pos) /*!< TIMER_T::CNT: CNT Mask */ #define TIMER_CAP_CAPDAT_Pos (0) /*!< TIMER_T::CAP: CAPDAT Position */ #define TIMER_CAP_CAPDAT_Msk (0xfffffful << TIMER_CAP_CAPDAT_Pos) /*!< TIMER_T::CAP: CAPDAT Mask */ #define TIMER_EXTCTL_CNTPHASE_Pos (0) /*!< TIMER_T::EXTCTL: CNTPHASE Position */ #define TIMER_EXTCTL_CNTPHASE_Msk (0x1ul << TIMER_EXTCTL_CNTPHASE_Pos) /*!< TIMER_T::EXTCTL: CNTPHASE Mask */ #define TIMER_EXTCTL_CAPEDGE_Pos (1) /*!< TIMER_T::EXTCTL: CAPEDGE Position */ #define TIMER_EXTCTL_CAPEDGE_Msk (0x3ul << TIMER_EXTCTL_CAPEDGE_Pos) /*!< TIMER_T::EXTCTL: CAPEDGE Mask */ #define TIMER_EXTCTL_CAPEN_Pos (3) /*!< TIMER_T::EXTCTL: CAPEN Position */ #define TIMER_EXTCTL_CAPEN_Msk (0x1ul << TIMER_EXTCTL_CAPEN_Pos) /*!< TIMER_T::EXTCTL: CAPEN Mask */ #define TIMER_EXTCTL_CAPFUNCS_Pos (4) /*!< TIMER_T::EXTCTL: CAPFUNCS Position */ #define TIMER_EXTCTL_CAPFUNCS_Msk (0x1ul << TIMER_EXTCTL_CAPFUNCS_Pos) /*!< TIMER_T::EXTCTL: CAPFUNCS Mask */ #define TIMER_EXTCTL_CAPIEN_Pos (5) /*!< TIMER_T::EXTCTL: CAPIEN Position */ #define TIMER_EXTCTL_CAPIEN_Msk (0x1ul << TIMER_EXTCTL_CAPIEN_Pos) /*!< TIMER_T::EXTCTL: CAPIEN Mask */ #define TIMER_EXTCTL_CAPDBEN_Pos (6) /*!< TIMER_T::EXTCTL: CAPDBEN Position */ #define TIMER_EXTCTL_CAPDBEN_Msk (0x1ul << TIMER_EXTCTL_CAPDBEN_Pos) /*!< TIMER_T::EXTCTL: CAPDBEN Mask */ #define TIMER_EXTCTL_CNTDBEN_Pos (7) /*!< TIMER_T::EXTCTL: CNTDBEN Position */ #define TIMER_EXTCTL_CNTDBEN_Msk (0x1ul << TIMER_EXTCTL_CNTDBEN_Pos) /*!< TIMER_T::EXTCTL: CNTDBEN Mask */ #define TIMER_EINTSTS_CAPIF_Pos (0) /*!< TIMER_T::EINTSTS: CAPIF Position */ #define TIMER_EINTSTS_CAPIF_Msk (0x1ul << TIMER_EINTSTS_CAPIF_Pos) /*!< TIMER_T::EINTSTS: CAPIF Mask */ /**@}*/ /* TIMER_CONST */ /**@}*/ /* end of TIMER register group */
#define TIMER0 ((TIMER_T *) TMR01_BASE) #define TIMER1 ((TIMER_T *) (TMR01_BASE + 0x20)) #define TIMER2 ((TIMER_T *) TMR23_BASE) #define TIMER3 ((TIMER_T *) (TMR23_BASE+ 0x20))
/** @addtogroup TIMER_EXPORTED_CONSTANTS TIMER Exported Constants @{ */ /*---------------------------------------------------------------------------------------------------------*/ /* TIMER Operation Mode, External Counter and Capture Mode Constant Definitions */ /*---------------------------------------------------------------------------------------------------------*/ #define TIMER_ONESHOT_MODE (0UL << TIMER_CTL_OPMODE_Pos) /*!< Timer working in one-shot mode */ #define TIMER_PERIODIC_MODE (1UL << TIMER_CTL_OPMODE_Pos) /*!< Timer working in periodic mode */ #define TIMER_TOGGLE_MODE (2UL << TIMER_CTL_OPMODE_Pos) /*!< Timer working in toggle-output mode */ #define TIMER_CONTINUOUS_MODE (3UL << TIMER_CTL_OPMODE_Pos) /*!< Timer working in continuous counting mode */ #define TIMER_TOUT_PIN_FROM_TX (0UL << TIMER_CTL_TGLPINSEL_Pos) /*!< Timer toggle-output pin is from Tx pin */ #define TIMER_TOUT_PIN_FROM_TX_EXT (1UL << TIMER_CTL_TGLPINSEL_Pos) /*!< Timer toggle-output pin is from Tx_EXT pin */ #define TIMER_CAPTURE_FREE_COUNTING_MODE (0UL << TIMER_EXTCTL_CAPFUNCS_Pos) /*!< Timer capture event to get timer counter value */ #define TIMER_CAPTURE_COUNTER_RESET_MODE (1UL << TIMER_EXTCTL_CAPFUNCS_Pos) /*!< Timer capture event to reset timer counter */ #define TIMER_CAPTURE_FALLING_EDGE (0UL << TIMER_EXTCTL_CAPEDGE_Pos) /*!< Falling edge detection to trigger timer capture */ #define TIMER_CAPTURE_RISING_EDGE (1UL << TIMER_EXTCTL_CAPEDGE_Pos) /*!< Rising edge detection to trigger timer capture */ #define TIMER_CAPTURE_FALLING_AND_RISING_EDGE (2UL << TIMER_EXTCTL_CAPEDGE_Pos) /*!< Both falling and rising edge detection to trigger timer capture */ #define TIMER_COUNTER_FALLING_EDGE (0UL << TIMER_EXTCTL_CNTPHASE_Pos) /*!< Counter increase on falling edge detection */ #define TIMER_COUNTER_RISING_EDGE (1UL << TIMER_EXTCTL_CNTPHASE_Pos) /*!< Counter increase on rising edge detection */ /*@}*/ /* end of group TIMER_EXPORTED_CONSTANTS */
TIMER1->CMP = ((SystemCoreClock / 4) / 2);
TIMER1->CTL = TIMER_CTL_INTEN_Msk | TIMER_PERIODIC_MODE;
TIMER_SET_PRESCALE_VALUE(TIMER1, 3);
One–shot模式
如果定时器工作在单周期 (one-shot) 模式(TIMERx_CTL[28:27]为00，且CNTEN (TIMERx_CTL[30])置1)，则定时器的计数器开始计数。一旦CNT (TIMERx_CNT[23:0])计数器的值达到CMPDAT (TIMERx_CMP[23:0])的值时，TIF (TIMERx_INTSTS[0])标志将变为1，CNT的值和 CNTEN位将由定时器控制器自动清零，然后定时器计数操作停止。与此同时，如果INTEN (TIMERx_CTL[29])位使能，则定时器中断信号产生并送到 NVIC通知CPU。（参见数据手册上的数据）
#define TIMER_CTL_OPMODE_Pos (27) /*!< TIMER_T::CTL: OPMODE Position */ #define TIMER_CTL_OPMODE_Msk (0x3ul << TIMER_CTL_OPMODE_Pos) /*!< TIMER_T::CTL: OPMODE Mask
如果定时器工作在周期 (periodic) 模式(TIMERx_CTL[28:27]为01)且CNTEN (TIMERx_CTL[30])置1，则定时器的计数器开始向上计数。一旦CNT (TIMERx_CNT[23:0])计数器的值达到CMPDAT (TIMERx_CMP[23:0])的值时，TIF (TIMERx_INTSTS[0])标志将变为1，CNT的值将由定时器控制器自动清零，然后定时器重新计数。与此同时，如果INTEN (TIMERx_CTL[29])使能，则定时器中断信号产生并送到 NVIC 通知 CPU 。在该模式，定时器控制器周期性地操作计数和 与CMPDAT的值比较，直到CNTEN位由软件清0。
