Code examples RM0367
1006/1043 RM0367 Rev 7
TIMy->CR1 |= TIM_CR1_CEN; /* (1) */
TIMx->CR1 |= TIM_CR1_CEN; /* (2) */
A.11.20 Two timers synchronized by an external trigger code example
/* (1) Configure TIMx master mode to send its enable signal
as trigger output (MMS=001 in the TIMx_CR2 register). */
/* (2) Configure TIMx in slave mode to get the input trigger from TI1
by writing TS = 100 in TIMx_SMCR
Configure TIMx in trigger mode, by writing SMS=110 in the
TIMx_SMCR register.
Configure TIMx in Master/Slave mode by writing MSM = 1
in TIMx_SMCR */
/* (3) Configure TIMy in slave mode to get the input trigger from Timer1
by writing TS = 000 in TIMy_SMCR (reset value)
Configure TIMy in trigger mode, by writing SMS=110 in the
TIMy_SMCR register. */
/* (4) Reset Timer x counter by writing '1' in UG bit (TIMx_EGR register) */
/* (5) Reset Timer y counter by writing '1' in UG bit (TIMy_EGR register) */
TIMx->CR2 |= TIM_CR2_MMS_0; /* (1 */
TIMx->SMCR |= TIM_SMCR_TS_2 | TIM_SMCR_SMS_2 | TIM_SMCR_SMS_1
| TIM_SMCR_MSM; /* (2) */
TIMy->SMCR |= TIM_SMCR_SMS_2 | TIM_SMCR_SMS_1; /* (3) */
TIMx->EGR |= TIM_EGR_UG; /* (4) */
TIMy->EGR |= TIM_EGR_UG; /* (5) */
/* Configure the Timer Channel 2 as PWM as PWM */
/* (1) Configure the Timer 1 Channel 2 waveform (TIM1_CCMR1 register)
is in PWM mode 1 (write OC2M = 110) */
/* (2) Set TIMx prescaler to 2 */
/* (3) Set TIMx Autoreload to 99 in order to get an overflow (so an UEV)
each 10ms */
/* (4) Set capture compare register to a value between 0 and 99 */
TIMx->CCMR1 |= TIM_CCMR1_OC2M_2 | TIM_CCMR1_OC2M_1; /* (1) */
TIMx->PSC = 2; /* (2) */
TIMx->ARR = 99; /* (3) */
TIMx-> CCR2 = 25; /* (4) */
/* Configure the slave timer Channel 1 as PWM as Timer
to show synchronicity */
/* (1) Configure the Timer 2 in PWM mode 1 (write OC1M = 110) */
/* (2) Set TIMy prescaler to 2 */
/* (3) Set TIMx Autoreload to 99 */
/* (4) Set capture compare register to 25 */
TIMy->CCMR1 |= TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_1; /* (1) */
TIMy->PSC = 2; /* (2) */
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