/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* STM32F2xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 4
- Global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock to 120 MHz */
SystemClock_Config();
/* Configure LED3 */
BSP_LED_Init(LED3);
/* Timers synchronisation in cascade mode with an external trigger -----
1/TIM1 is configured as Master Timer:
- Toggle Mode is used
- The TIM1 Enable event is used as Trigger Output
2/TIM1 is configured as Slave Timer for an external Trigger connected
to TIM1 TI2 pin (TIM1 CH2 configured as input pin):
- The TIM1 TI2FP2 is used as Trigger Input
- Rising edge is used to start and stop the TIM1: Gated Mode.
3/TIM3 is slave for TIM1 and Master for TIM4,
- Toggle Mode is used
- The ITR1(TIM1) is used as input trigger
- Gated mode is used, so start and stop of slave counter
are controlled by the Master trigger output signal(TIM1 enable event).
- The TIM3 enable event is used as Trigger Output.
4/TIM4 is slave for TIM3,
- Toggle Mode is used
- The ITR2(TIM3) is used as input trigger
- Gated mode is used, so start and stop of slave counter
are controlled by the Master trigger output signal(TIM3 enable event).
TIM1 input clock (TIM1CLK) is set to 2 * APB2 clock (PCLK2),
since APB2 prescaler is different from 1.
TIM1CLK = 2 * PCLK2
PCLK2 = HCLK / 2
=> TIM1CLK = 2 * (HCLK / 2) = HCLK = SystemCoreClock
TIM3/TIM4 input clock (TIM3CLK/TIM4CLK) is set to 2 * APB1 clock (PCLK1),
since APB1 prescaler is different from 1.
TIM3CLK/TIM4CLK = 2 * PCLK1
PCLK1 = HCLK / 4
=> TIM3CLK/TIM4CLK = HCLK / 2 = SystemCoreClock /2
The TIM1CLK is fixed to 120 MHZ, the Prescaler is equal to 5 so the TIMx clock
counter is equal to 28 MHz.
The TIM3CLK and TIM4CLK are fixed to 84 MHZ, the Prescaler is equal to 5
so the TIMx clock counter is equal to 14 MHz.
The Three Timers are running at:
TIMx frequency = TIMx clock counter/ 2*(TIMx_Period + 1) = 93,3 KHz.
The starts and stops of the TIM1 counters are controlled by the
external trigger.
The TIM3 starts and stops are controlled by the TIM1, and the TIM4
starts and stops are controlled by the TIM3.
Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f2xx.c file.
Each time the core clock (HCLK) changes, user had to update SystemCoreClock
variable value. Otherwise, any configuration based on this variable will be incorrect.
This variable is updated in three ways:
1) by calling CMSIS function SystemCoreClockUpdate()
2) by calling HAL API function HAL_RCC_GetSysClockFreq()
3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
-------------------------------------------------------------------- */
/* Set Timers instance */
TimMasterHandle.Instance = TIM1;
TimSlaveMasterHandle.Instance = TIM3;
TimSlaveHandle.Instance = TIM4;
/*======= Master1/Slave for an external trigger configuration : TIM1 =======*/
/* Initialize TIM1 peripheral in Output Compare mode*/
TimMasterHandle.Init.Period = 149;
TimMasterHandle.Init.Prescaler = 5;
TimMasterHandle.Init.ClockDivision = 0;
TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
TimMasterHandle.Init.RepetitionCounter = 0;
if(HAL_TIM_OC_Init(&TimMasterHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Configure the output: Channel_1 */
sOCConfig.OCMode = TIM_OCMODE_TOGGLE;
sOCConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
if(HAL_TIM_OC_ConfigChannel(&TimMasterHandle, &sOCConfig, TIM_CHANNEL_1) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure the Input: channel_2 */
sICConfig.ICPolarity = TIM_ICPOLARITY_RISING;
sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
sICConfig.ICFilter = 0;
if(HAL_TIM_IC_ConfigChannel(&TimMasterHandle, &sICConfig, TIM_CHANNEL_2) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM1 in Gated Slave mode for the external trigger (Filtered Timer
Input 2) */
sSlaveConfig.InputTrigger = TIM_TS_TI2FP2;
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;
if( HAL_TIM_SlaveConfigSynchronization(&TimMasterHandle, &sSlaveConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM1 in Master Enable mode & use the update event as Trigger
Output (TRGO) */
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
sMasterConfig.MasterOutputTrigger = TIM_TRGO_ENABLE;
if( HAL_TIMEx_MasterConfigSynchronization(&TimMasterHandle, &sMasterConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/*=== End of Master1/Slave for an external trigger configuration : TIM1 ====*/
/*=================== Slave/Master configuration : TIM3 ====================*/
/* Initialize TIM3 peripheral in Output Compare mode*/
TimSlaveMasterHandle.Init.Period = 74;
TimSlaveMasterHandle.Init.Prescaler = 5;
TimSlaveMasterHandle.Init.ClockDivision = 0;
TimSlaveMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
TimSlaveMasterHandle.Init.RepetitionCounter = 0;
if(HAL_TIM_OC_Init(&TimSlaveMasterHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Configure the Output Compare channel_1 */
sOCConfig.OCMode = TIM_OCMODE_TOGGLE;
sOCConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
if(HAL_TIM_OC_ConfigChannel(&TimSlaveMasterHandle, &sOCConfig, TIM_CHANNEL_1) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM3 in Gated Slave mode for the internal trigger 0(ITR0) */
sSlaveConfig.InputTrigger = TIM_TS_ITR0;
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;
if( HAL_TIM_SlaveConfigSynchronization(&TimSlaveMasterHandle, &sSlaveConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM3 in Master Enable mode & use the update event as Trigger
Output (TRGO) */
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
sMasterConfig.MasterOutputTrigger = TIM_TRGO_ENABLE;
if( HAL_TIMEx_MasterConfigSynchronization(&TimSlaveMasterHandle, &sMasterConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/*=============== End of Slave/Master configuration : TIM3 =================*/
/*====================== Slave configuration : TIM4 ========================*/
/* Initialize TIM4 peripheral in Output Compare mode*/
TimSlaveHandle.Init.Period = 74;
TimSlaveHandle.Init.Prescaler = 5;
TimSlaveHandle.Init.ClockDivision = 0;
TimSlaveHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
TimSlaveHandle.Init.RepetitionCounter = 0;
if(HAL_TIM_OC_Init(&TimSlaveHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Configure the Output Compare channel_1 */
sOCConfig.OCMode = TIM_OCMODE_TOGGLE;
sOCConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
if(HAL_TIM_OC_ConfigChannel(&TimSlaveHandle, &sOCConfig, TIM_CHANNEL_1) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM4 in Gated Slave mode for the internal trigger 2(ITR2) */
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;
sSlaveConfig.InputTrigger = TIM_TS_ITR2;
if(HAL_TIM_SlaveConfigSynchronization(&TimSlaveHandle, &sSlaveConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/*================== End of Slave configuration : TIM4 =====================*/
/* 1- Start Timer1 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx */
/* Start Channel2 in Input Capture */
if(HAL_TIM_IC_Start(&TimMasterHandle, TIM_CHANNEL_2) != HAL_OK)
{
/* Start Error */
Error_Handler();
}
/* Start the Output Compare */
if(HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1) != HAL_OK)
{
/* Start Error */
Error_Handler();
}
/* 2- Start Timer3 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx */
/* Start the Output Compare */
if(HAL_TIM_OC_Start(&TimSlaveMasterHandle, TIM_CHANNEL_1) != HAL_OK)
{
/* Start Error */
Error_Handler();
}
/* 3- Start Timer3 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx */
/* Start the Output Compare */
if(HAL_TIM_OC_Start(&TimSlaveHandle, TIM_CHANNEL_1) != HAL_OK)
{
/* Start Error */
Error_Handler();
}
/* Infinite loop */
while (1)
{
}
}
/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
/* Enable the CPU Cache */
CPU_CACHE_Enable();
/* STM32F7xx HAL library initialization:
- Configure the Flash ART accelerator on ITCM interface
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 216 MHz */
SystemClock_Config();
/* Configure LED3 */
BSP_LED_Init(LED3);
/* Set Timers instance */
TimMasterHandle.Instance = TIM1;
TimSlaveMasterHandle.Instance = TIM4;
TimSlaveHandle.Instance = TIM5;
/*======= Master1/Slave for an external trigger configuration : TIM1 =======*/
/* Initialize TIM1 peripheral in Output Compare mode*/
TimMasterHandle.Init.Period = 79;
TimMasterHandle.Init.Prescaler = (SystemCoreClock / 16000000) - 1;;
TimMasterHandle.Init.ClockDivision = 0;
TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
if(HAL_TIM_OC_Init(&TimMasterHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Configure the output: Channel_1 */
sOCConfig.OCMode = TIM_OCMODE_TOGGLE;
sOCConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
if(HAL_TIM_OC_ConfigChannel(&TimMasterHandle, &sOCConfig, TIM_CHANNEL_1) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure the Input: channel_2 */
sICConfig.ICPolarity = TIM_ICPOLARITY_RISING;
sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
sICConfig.ICFilter = 0;
if(HAL_TIM_IC_ConfigChannel(&TimMasterHandle, &sICConfig, TIM_CHANNEL_2) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM1 in Gated Slave mode for the external trigger (Filtered Timer
Input 2) */
sSlaveConfig.InputTrigger = TIM_TS_TI2FP2;
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;
if( HAL_TIM_SlaveConfigSynchronization(&TimMasterHandle, &sSlaveConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM1 in Master Enable mode & use the update event as Trigger
Output (TRGO) */
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
sMasterConfig.MasterOutputTrigger = TIM_TRGO_ENABLE;
if( HAL_TIMEx_MasterConfigSynchronization(&TimMasterHandle, &sMasterConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/*=== End of Master1/Slave for an external trigger configuration : TIM1 ====*/
/*=================== Slave/Master configuration : TIM4 ====================*/
/* Initialize TIM4 peripheral in Output Compare mode*/
TimSlaveMasterHandle.Init.Period = 79;
TimSlaveMasterHandle.Init.Prescaler = ((SystemCoreClock/2) / 16000000) - 1;;
TimSlaveMasterHandle.Init.ClockDivision = 0;
TimSlaveMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
if(HAL_TIM_OC_Init(&TimSlaveMasterHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Configure the Output Compare channel_1 */
sOCConfig.OCMode = TIM_OCMODE_TOGGLE;
sOCConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
if(HAL_TIM_OC_ConfigChannel(&TimSlaveMasterHandle, &sOCConfig, TIM_CHANNEL_1) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM4 in Gated Slave mode for the internal trigger 0(ITR0) */
sSlaveConfig.InputTrigger = TIM_TS_ITR0;
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;
if( HAL_TIM_SlaveConfigSynchronization(&TimSlaveMasterHandle, &sSlaveConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM4 in Master Enable mode & use the update event as Trigger
Output (TRGO) */
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
sMasterConfig.MasterOutputTrigger = TIM_TRGO_ENABLE;
if( HAL_TIMEx_MasterConfigSynchronization(&TimSlaveMasterHandle, &sMasterConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/*=============== End of Slave/Master configuration : TIM4 =================*/
/*====================== Slave configuration : TIM5 ========================*/
/* Initialize TIM5 peripheral in Output Compare mode*/
TimSlaveHandle.Init.Period = 79;
TimSlaveHandle.Init.Prescaler = ((SystemCoreClock/2) / 16000000) - 1;;
TimSlaveHandle.Init.ClockDivision = 0;
TimSlaveHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
if(HAL_TIM_OC_Init(&TimSlaveHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Configure the Output Compare channel_1 */
sOCConfig.OCMode = TIM_OCMODE_TOGGLE;
sOCConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
if(HAL_TIM_OC_ConfigChannel(&TimSlaveHandle, &sOCConfig, TIM_CHANNEL_1) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Configure TIM5 in Gated Slave mode for the internal trigger 2(ITR2) */
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;
sSlaveConfig.InputTrigger = TIM_TS_ITR2;
if(HAL_TIM_SlaveConfigSynchronization(&TimSlaveHandle, &sSlaveConfig) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/*================== End of Slave configuration : TIM5 =====================*/
/* 1- Start Timer1 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx */
/* Start Channel2 in Input Capture */
if(HAL_TIM_IC_Start(&TimMasterHandle, TIM_CHANNEL_2) != HAL_OK)
{
/* Start Error */
Error_Handler();
}
/* Start the Output Compare */
if(HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1) != HAL_OK)
{
/* Start Error */
Error_Handler();
}
/* 2- Start Timer3 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx */
/* Start the Output Compare */
if(HAL_TIM_OC_Start(&TimSlaveMasterHandle, TIM_CHANNEL_1) != HAL_OK)
{
/* Start Error */
Error_Handler();
}
/* 3- Start Timer3 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx */
/* Start the Output Compare */
if(HAL_TIM_OC_Start(&TimSlaveHandle, TIM_CHANNEL_1) != HAL_OK)
{
/* Start Error */
Error_Handler();
}
/* Infinite loop */
while (1)
{
}
}