TimerIntEnable(GPTIMER0_BASE,GPTIMER_CAPB_EVENT) TimerIntRegister(GPTIMER0_BASE,GPTIMER_B, FreqMeasure_handler) !< Register a handler else systick will be called UARTprintf(' Time_B0 = %d ', TimevalgetB) *TimevalgetB= TimerValueGet(GPTIMER0_BASE, GPTIMER_B) TimerControlEvent(GPTIMER0_BASE,GPTIMER_B,GPTIMER_EVENT_POS_EDGE) //!< EDGES ! Timer Control Event TimerControlEvent(uint32_t ui32Base, uint32_t ui32Timer, uint32_t ui32Event)

TimerConfigure(GPTIMER0_BASE, GPTIMER_CFG_SPLIT_PAIR | GPTIMER_CFG_B_CAP_COUNT | GPTIMER_CFG_A_PERIODIC_UP ) !< GPTIMER_CFG ( Configure Timer for 16 bit Timer ) TimerDisable(GPTIMER0_BASE,GPTIMER_BOTH) IOCPinConfigPeriphInput(BSP_LED_BASE, BSP_LED_1, IOC_GPT0OCP1) SysCtrlPeripheralEnable(SYS_CTRL_PERIPH_GPT0) SysCtrlIOClockSet(SYS_CTRL_SYSDIV_32MHZ) SysCtrlClockSet(false, false, SYS_CTRL_SYSDIV_32MHZ) Inīoth cases, the status flags are cleared by writing a 1 to the CnMCINT bit of the GPTM Interrupt Poll the CnMRIS bit in the GPTMRIS register or wait for the interrupt to be generated (if enabled). Set the TnEN bit in the GPTIMER_CTL register to enable the timer and begin waiting for edge events.ġ0. If interrupts are required, set the CnMIM bit in the GPTM Interrupt Mask (GPTIMER_IMR) register.ĩ. Load the event count into the GPTM Timer n Match (GPTIMER_TnMATCHR) register.Ĩ. Load the timer start value into the GPTM Timer n Interval Load (GPTIMER_TnILR) register.ħ. If a prescaler is to be used, write the prescale value to the GPTM Timer n Prescale RegisterĦ. Configure the type of event(s) that the timer captures by writing the TnEVENT field of the GPTMĥ. In the GPTM Timer Mode (GPTIMER_TnMR) register, write the TnCMR field to 0x0 and the TnMRĤ. Write the GPTM Configuration (GPTIMER_CFG) register with a value of 0x0000.0004.ģ. Ensure the timer is disabled (the TAEN bit is cleared) before making any changes.Ģ. I am going to post the steps and my code for the same.Ī timer is configured to Input Edge-Count mode by the following sequence:ġ. Also followed the steps as mentioned in the data sheet. I would like to use the CC2538 in Input Edge Count mode using Timer for detection of rising edges. I would like to measure a frequency from 500 Khz to 1 MHz. I am giving a rising edge frequency to CC2538 at BSP_LED_1 pin of CC2538.

Keil 5 与 tm4c1231c3pm