ST STM32L0x3 User Manual

Code examples RM0367
1002/1043 RM0367 Rev 7
Select TI2 as the trigger input source by writing TS=110
in the TIMx_SMCR register.*/
/* (4) Set prescaler to 4000-1 in order to get an increment each 250us */
TIMx->CCMR1 |= TIM_CCMR1_CC2S_0; /* (1 */
//TIMx->CCER &= ~TIM_CCER_CC2P; /* (2) */
TIMx->SMCR |= TIM_SMCR_SMS_2 | TIM_SMCR_SMS_1 \
| TIM_SMCR_TS_2 | TIM_SMCR_TS_1; /* (3) */
TIMx->PSC = 3999; /* (4) */
A.11.15 External clock mode 2 + trigger mode code example
/* (1) Configure no input filter (ETF=0000, reset value)
configure prescaler disabled (ETPS = 0, reset value)
select detection on rising edge on ETR (ETP = 0, reset value)
enable external clock mode 2 (ECE = 1 */
/* (2) Configure no input filter (IC1F=0000, reset value)
select input capture source on TI1 (CC1S = 01) */
/* (3) Select polarity by writing CC1P=0 (reset value) in the TIMx_CCER
register */
/* (4) Configure the timer in trigger mode by writing SMS=110
Select TI1 as the trigger input source by writing TS=101
in the TIMx_SMCR register.*/
TIMx->SMCR |= TIM_SMCR_ECE; /* (1) */
TIMx->CCMR1 |= TIM_CCMR1_CC1S_0; /* (2 */
//TIMx->CCER &= ~TIM_CCER_CC1P; /* (3) */
TIMx->SMCR |= TIM_SMCR_SMS_2 | TIM_SMCR_SMS_1 \
| TIM_SMCR_TS_2 | TIM_SMCR_TS_0; /* (4) */
A.11.16 One-Pulse mode code example
/* The OPM waveform is defined by writing the compare registers */
/* (1) Set prescaler to 15, so APBCLK/16 i.e 1MHz */
/* (2) Set ARR = 7, as timer clock is 1MHz the period is 8 us */
/* (3) Set CCRx = 5, the burst will be delayed for 5 us (must be > 0 */
/* (4) Select PWM mode 2 on OC1 (OC1M = 111),
enable preload register on OC1 (OC1PE = 1, reset value)
enable fast enable (no delay) if PULSE_WITHOUT_DELAY is set*/
/* (5) Select active high polarity on OC1 (CC1P = 0, reset value),
enable the output on OC1 (CC1E = 1 */
/* (6) Enable output (MOE = 1) */
/* (7) Write '1 in the OPM bit in the TIMx_CR1 register to stop the
counter
at the next update event (OPM = 1)
enable auto-reload register(ARPE = 1) */
TIMx->PSC = 15; /* (1) */

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English