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| /** | ||
| * \file bsp_laser.h | ||
| * \brief Supports the laser pulse generator. | ||
| * \date 2014-05-20 | ||
| * \version 0.1 | ||
| * \author Kevin Gerber | ||
| * | ||
| * \addtogroup bsp | ||
| * @{ | ||
| * | ||
| * \addtogroup bsp_laser | ||
| * \brief This Module provides the functions to configure the laser pulse generator. | ||
| * @{ | ||
| */ | ||
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| #ifndef BSP_LASER_H_ | ||
| #define BSP_LASER_H_ | ||
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| #include "bsp.h" | ||
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| /* | ||
| * ---------------------------------------------------------------------------- | ||
| * Pulse settings | ||
| * ---------------------------------------------------------------------------- | ||
| */ | ||
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| /** PWM frequency of the laser pulse generator. */ | ||
| #define BSP_LASER_FREQ 84000000 | ||
| /** Period register of the PWM. The frequency of the laser pulse replay is f = BSP_LASER_FREQ[Hz] / (BSP_LASER_PERIOD-1) */ | ||
| #define BSP_LASER_PERIOD 1681 | ||
| /** Laser pulse width. The duty cycle is D = BSP_LASER_PULSE_WIDTH / (BSP_LASER_PERIOD-1) */ | ||
| #define BSP_LASER_PULSE_WIDTH 3 | ||
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| /* | ||
| * ---------------------------------------------------------------------------- | ||
| * Hardware configurations | ||
| * ---------------------------------------------------------------------------- | ||
| */ | ||
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| /** RCC AHB peripheral of the timer port. */ | ||
| #define BSP_LASER_TIMER_PORT_PERIPH RCC_APB1Periph_TIM5 | ||
| /** Port base address of the timer port */ | ||
| #define BSP_LASER_TIMER_PORT_BASE TIM5 | ||
| /** Used PWM type */ | ||
| #define BSP_LASER_TIMER_PORT_CHANEL CHANEL1 | ||
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| /** Hardware label of the PWM output pin, which is connected to the engine. */ | ||
| static const bsp_gpioconf_t BSP_LASER_PORT = { | ||
| RCC_AHB1Periph_GPIOA, GPIOA, GPIO_Pin_0, GPIO_Mode_AF, GPIO_PuPd_NOPULL, GPIO_AF_TIM5 | ||
| }; | ||
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| /* Interrupt settings */ | ||
| #define BSP_LASER_IRQ_CHANEL TIM5_IRQn /*!< NVIC timer interrupt */ | ||
| #define BSP_LASER_IRQ_SOURCE TIM_IT_CC1 /*!< NVIC timer interrupt source */ | ||
| #define BSP_LASER_IRQ_PRIORITY 2 /*!< NVIC timer interrupt priority */ | ||
| #define BSP_LASER_IRQ_Handler TIM5_IRQHandler /*!< NVIC timer handler */ | ||
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| /* | ||
| * ---------------------------------------------------------------------------- | ||
| * Prototypes | ||
| * ---------------------------------------------------------------------------- | ||
| */ | ||
| extern void bsp_LaserInit(void); | ||
| extern void bsp_LaserPulse(uint32_t nr_of_pulses); | ||
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| #endif /* BSP_LASER_H_ */ | ||
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| /** | ||
| * @} | ||
| */ | ||
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| /** | ||
| * @} | ||
| */ |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,179 @@ | ||
| /** | ||
| * \file bsp_laser.c | ||
| * \brief Supports the laser pulse generator. | ||
| * \date 2014-05-20 | ||
| * \version 0.1 | ||
| * \author Kevin Gerber | ||
| * | ||
| * \addtogroup bsp | ||
| * @{ | ||
| * | ||
| * \addtogroup bsp_laser | ||
| * @{ | ||
| */ | ||
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| #include "bsp_laser.h" | ||
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| /* | ||
| * ---------------------------------------------------------------------------- | ||
| * Private functions prototypes | ||
| * ---------------------------------------------------------------------------- | ||
| */ | ||
| void bsp_LaserEnable(void); | ||
| void bsp_LaserDisable(void); | ||
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| /* | ||
| * ---------------------------------------------------------------------------- | ||
| * Private variables | ||
| * ---------------------------------------------------------------------------- | ||
| */ | ||
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| /** | ||
| * \brief Counter of the remaining laser pulses. | ||
| */ | ||
| static uint32_t g_laserPulseCtr = 0; | ||
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| /* | ||
| * ---------------------------------------------------------------------------- | ||
| * Interrupt functions | ||
| * ---------------------------------------------------------------------------- | ||
| */ | ||
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| /** | ||
| * \brief Timer interrupt handler. It is triggered by the capture compare register. | ||
| */ | ||
| void BSP_LASER_IRQ_Handler(void) { | ||
| if (TIM_GetITStatus(BSP_LASER_TIMER_PORT_BASE, BSP_LASER_IRQ_SOURCE) != RESET) { | ||
| TIM_ClearITPendingBit(BSP_LASER_TIMER_PORT_BASE, BSP_LASER_IRQ_SOURCE); | ||
| /* One pulse generated */ | ||
| g_laserPulseCtr--; | ||
| if (g_laserPulseCtr == 0) { | ||
| /* All laser pulse were made */ | ||
| bsp_LaserDisable(); | ||
| } | ||
| } | ||
| } | ||
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| /* | ||
| * ---------------------------------------------------------------------------- | ||
| * Implementation | ||
| * ---------------------------------------------------------------------------- | ||
| */ | ||
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| /** | ||
| * \brief Initialize the laser pulse generator. It is used one PWM channel to make the pulse. | ||
| */ | ||
| void bsp_LaserInit(void) { | ||
| TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; | ||
| TIM_OCInitTypeDef TIM_OCInitStructure; | ||
| NVIC_InitTypeDef NVIC_InitStructure; | ||
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| uint16_t PrescalerValue; | ||
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| /* Initialize all GPIOs in their function */ | ||
| bsp_GpioInit(&BSP_LASER_PORT); | ||
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| /* TIM clock enable */ | ||
| RCC_APB1PeriphClockCmd(BSP_LASER_TIMER_PORT_PERIPH, ENABLE); | ||
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| /* Compute the prescaler value */ | ||
| PrescalerValue = (uint16_t) ((SystemCoreClock /2) / BSP_LASER_FREQ) - 1; | ||
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| /* Time base configuration */ | ||
| TIM_TimeBaseStructure.TIM_Period = BSP_LASER_PERIOD; | ||
| TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue; | ||
| TIM_TimeBaseStructure.TIM_ClockDivision = 0; | ||
| TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; | ||
| TIM_TimeBaseInit(BSP_LASER_TIMER_PORT_BASE, &TIM_TimeBaseStructure); | ||
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| /* PWM Mode configuration */ | ||
| TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; | ||
| TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; | ||
| TIM_OCInitStructure.TIM_Pulse = 0;//BSP_LASER_PULSE_WIDTH; | ||
| TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; | ||
| /* Check the PWM port */ | ||
| switch (BSP_LASER_TIMER_PORT_CHANEL) { | ||
| case CHANEL1: | ||
| /* PWM Mode configuration: Channel1 */ | ||
| TIM_OC1Init(BSP_LASER_TIMER_PORT_BASE, &TIM_OCInitStructure); | ||
| TIM_OC1PreloadConfig(BSP_LASER_TIMER_PORT_BASE, TIM_OCPreload_Enable); | ||
| break; | ||
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| case CHANEL2: | ||
| /* PWM Mode configuration: Channel2 */ | ||
| TIM_OC2Init(BSP_LASER_TIMER_PORT_BASE, &TIM_OCInitStructure); | ||
| TIM_OC2PreloadConfig(BSP_LASER_TIMER_PORT_BASE, TIM_OCPreload_Enable); | ||
| break; | ||
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| case CHANEL3: | ||
| /* PWM Mode configuration: Channel3 */ | ||
| TIM_OC3Init(BSP_LASER_TIMER_PORT_BASE, &TIM_OCInitStructure); | ||
| TIM_OC3PreloadConfig(BSP_LASER_TIMER_PORT_BASE, TIM_OCPreload_Enable); | ||
| break; | ||
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| case CHANEL4: | ||
| /* PWM Mode configuration: Channel4 */ | ||
| TIM_OC4Init(BSP_LASER_TIMER_PORT_BASE, &TIM_OCInitStructure); | ||
| TIM_OC4PreloadConfig(BSP_LASER_TIMER_PORT_BASE, TIM_OCPreload_Enable); | ||
| break; | ||
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| default: | ||
| assert(BSP_LASER_TIMER_PORT_CHANEL); | ||
| break; | ||
| } | ||
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| /* Enables TIMx peripheral preload register on ARR */ | ||
| TIM_ARRPreloadConfig(BSP_LASER_TIMER_PORT_BASE, ENABLE); | ||
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| /* Enable timer interrupt on capture compare */ | ||
| TIM_ITConfig(BSP_LASER_TIMER_PORT_BASE, BSP_LASER_IRQ_SOURCE, ENABLE); | ||
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| NVIC_InitStructure.NVIC_IRQChannel = BSP_LASER_IRQ_CHANEL; | ||
| NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = BSP_LASER_IRQ_PRIORITY; | ||
| NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; | ||
| NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; | ||
| NVIC_Init(&NVIC_InitStructure); | ||
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| /* Enable the timer */ | ||
| TIM_Cmd(BSP_LASER_TIMER_PORT_BASE, ENABLE); | ||
| } | ||
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| /** | ||
| * \brief Generates a number of pulses in the configured repetition frequency and pulse width. | ||
| * \param[in] nr_of_pulses is the number of pulse repetition. | ||
| */ | ||
| void bsp_LaserPulse(uint32_t nr_of_pulses) { | ||
| g_laserPulseCtr = nr_of_pulses; | ||
| bsp_LaserEnable(); | ||
| } | ||
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| /** | ||
| * \brief Enable the engine. It will turn with the configured speed. | ||
| */ | ||
| void bsp_LaserEnable(void) { | ||
| /* Starts a new pulse */ | ||
| TIM_SetCounter(BSP_LASER_TIMER_PORT_BASE, BSP_LASER_PERIOD-20); | ||
| /* Sets pulse width */ | ||
| TIM_SetCompare1(BSP_LASER_TIMER_PORT_BASE, BSP_LASER_PULSE_WIDTH); | ||
| } | ||
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| /** | ||
| * \brief Disable the engine. It will be stopped. | ||
| */ | ||
| void bsp_LaserDisable(void) { | ||
| /* Set output to low */ | ||
| TIM_SetCompare1(BSP_LASER_TIMER_PORT_BASE, 0); | ||
| } | ||
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| /** | ||
| * @} | ||
| */ | ||
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| /** | ||
| * @} | ||
| */ |
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