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/**
******************************************************************************
* @file Examples_LL/DAC/DAC_GenerateWaveform_TriggerHW_Init/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use the DAC peripheral to generate
* a voltage waveform from digital data stream transferred by DMA.
* This example is based on the STM32F4xx DAC LL API;
* Peripheral initialization done using LL initialization function.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup DAC_GenerateWaveform_TriggerHW_Init
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Definitions of environment analog values */
/* Value of analog reference voltage (Vref+), connected to analog voltage */
/* supply Vdda (unit: mV). */
#define VDDA_APPLI ((uint32_t)3300)
/* Definitions of data related to this example */
/* Full-scale digital value with a resolution of 12 bits (voltage range */
/* determined by analog voltage references Vref+ and Vref-, */
/* refer to reference manual). */
#define DIGITAL_SCALE_12BITS (__LL_DAC_DIGITAL_SCALE(LL_DAC_RESOLUTION_12B))
/* Definitions of waveform generation values */
/* Waveform generation: parameters of waveform */
/* Waveform amplitude (unit: mV) */
#define WAVEFORM_AMPLITUDE (VDDA_APPLI)
/* Waveform amplitude (unit: Hz) */
#define WAVEFORM_FREQUENCY ((uint32_t)1000)
/* Size of array containing DAC waveform samples */
#define WAVEFORM_SAMPLES_SIZE (sizeof (WaveformSine_12bits_32samples) / sizeof (uint16_t))
/* Waveform generation: parameters of timer (used as DAC trigger) */
/* Timer frequency (unit: Hz). With a timer 16 bits and time base */
/* freq min 1Hz, range is min=1Hz, max=32kHz. */
#define WAVEFORM_TIMER_FREQUENCY (WAVEFORM_FREQUENCY * WAVEFORM_SAMPLES_SIZE)
/* Timer minimum frequency (unit: Hz), used to calculate frequency range. */
/* With a timer 16 bits, maximum frequency will be 32000 times this value. */
#define WAVEFORM_TIMER_FREQUENCY_RANGE_MIN ((uint32_t) 1)
/* Timer prescaler maximum value (0xFFFF for a timer 16 bits) */
#define WAVEFORM_TIMER_PRESCALER_MAX_VALUE ((uint32_t)0xFFFF-1)
/* Private macro -------------------------------------------------------------*/
/**
* @brief Computation of a data from maximum value on digital scale 12 bits
* (corresponding to voltage Vdda)
* to a value on the new scale
* (corresponding to voltage defined by WAVEFORM_AMPLITUDE).
* @param __DATA_12BITS__: Digital value on scale 12 bits
* @retval None
*/
#define __WAVEFORM_AMPLITUDE_SCALING(__DATA_12BITS__) \
(__DATA_12BITS__ \
* __LL_DAC_CALC_VOLTAGE_TO_DATA(VDDA_APPLI, WAVEFORM_AMPLITUDE, LL_DAC_RESOLUTION_12B) \
/ __LL_DAC_DIGITAL_SCALE(LL_DAC_RESOLUTION_12B) \
)
/* Private variables ---------------------------------------------------------*/
__IO uint8_t ubButtonPress = 0;
/* Private variables ---------------------------------------------------------*/
const uint16_t WaveformSine_12bits_32samples[] =
{
__WAVEFORM_AMPLITUDE_SCALING(2048),
__WAVEFORM_AMPLITUDE_SCALING(2447),
__WAVEFORM_AMPLITUDE_SCALING(2831),
__WAVEFORM_AMPLITUDE_SCALING(3185),
__WAVEFORM_AMPLITUDE_SCALING(3495),
__WAVEFORM_AMPLITUDE_SCALING(3750),
__WAVEFORM_AMPLITUDE_SCALING(3939),
__WAVEFORM_AMPLITUDE_SCALING(4056),
__WAVEFORM_AMPLITUDE_SCALING(4095),
__WAVEFORM_AMPLITUDE_SCALING(4056),
__WAVEFORM_AMPLITUDE_SCALING(3939),
__WAVEFORM_AMPLITUDE_SCALING(3750),
__WAVEFORM_AMPLITUDE_SCALING(3495),
__WAVEFORM_AMPLITUDE_SCALING(3185),
__WAVEFORM_AMPLITUDE_SCALING(2831),
__WAVEFORM_AMPLITUDE_SCALING(2447),
__WAVEFORM_AMPLITUDE_SCALING(2048),
__WAVEFORM_AMPLITUDE_SCALING(1649),
__WAVEFORM_AMPLITUDE_SCALING(1265),
__WAVEFORM_AMPLITUDE_SCALING(911),
__WAVEFORM_AMPLITUDE_SCALING(601),
__WAVEFORM_AMPLITUDE_SCALING(346),
__WAVEFORM_AMPLITUDE_SCALING(157),
__WAVEFORM_AMPLITUDE_SCALING(40),
__WAVEFORM_AMPLITUDE_SCALING(0),
__WAVEFORM_AMPLITUDE_SCALING(40),
__WAVEFORM_AMPLITUDE_SCALING(157),
__WAVEFORM_AMPLITUDE_SCALING(346),
__WAVEFORM_AMPLITUDE_SCALING(601),
__WAVEFORM_AMPLITUDE_SCALING(911),
__WAVEFORM_AMPLITUDE_SCALING(1265),
__WAVEFORM_AMPLITUDE_SCALING(1649)
};
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Configure_DMA(void);
void Configure_TIM_TimeBase_DAC_trigger(void);
void Configure_DAC(void);
void Activate_DAC(void);
void LED_Init(void);
void LED_On(void);
void LED_Off(void);
void LED_Blinking(uint32_t Period);
void UserButton_Init(void);
void WaitForUserButtonPress(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 180 MHz */
SystemClock_Config();
/* Initialize LED1 */
LED_Init();
/* Initialize button in EXTI mode */
UserButton_Init();
/* Wait for User push-button press */
WaitForUserButtonPress();
/* Turn-off LED1 */
LED_Off();
/* Configure DMA for data transfer from DAC */
Configure_DMA();
/* Configure timer as a time base used to trig DAC conversion start */
Configure_TIM_TimeBase_DAC_trigger();
/* Configure DAC channel */
Configure_DAC();
/* Activate DAC channel */
Activate_DAC();
/* Turn-on LED1 */
LED_On();
/* Infinite loop */
while (1)
{
}
}
/**
* @brief This function configures DMA for transfer of data from DAC
* @param None
* @retval None
*/
void Configure_DMA(void)
{
/*## Configuration of NVIC #################################################*/
/* Configure NVIC to enable DMA interruptions */
NVIC_SetPriority(DMA1_Stream5_IRQn, 1); /* DMA IRQ lower priority than DAC IRQ */
NVIC_EnableIRQ(DMA1_Stream5_IRQn);
/*## Configuration of DMA ##################################################*/
/* Enable the peripheral clock of DMA */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_DMA1);
/* Configure the DMA transfer */
/* - DMA transfer in circular mode to have an unlimited DAC signal */
/* generation. */
/* - DMA transfer to DAC without address increment. */
/* - DMA transfer from memory with address increment. */
/* - DMA transfer to DAC by half-word to match with DAC resolution 12 bits */
/* - DMA transfer from memory by half-word to match with DAC data */
/* buffer variable type: half-word.
*/
LL_DMA_SetChannelSelection(DMA1, LL_DMA_STREAM_5, LL_DMA_CHANNEL_7);
LL_DMA_ConfigTransfer(DMA1,
LL_DMA_STREAM_5,
LL_DMA_DIRECTION_MEMORY_TO_PERIPH |
LL_DMA_MODE_CIRCULAR |
LL_DMA_PERIPH_NOINCREMENT |
LL_DMA_MEMORY_INCREMENT |
LL_DMA_PDATAALIGN_HALFWORD |
LL_DMA_MDATAALIGN_HALFWORD |
LL_DMA_PRIORITY_HIGH );
/* Set DMA transfer addresses of source and destination */
LL_DMA_ConfigAddresses(DMA1,
LL_DMA_STREAM_5,
(uint32_t)&WaveformSine_12bits_32samples,
LL_DAC_DMA_GetRegAddr(DAC1, LL_DAC_CHANNEL_1, LL_DAC_DMA_REG_DATA_12BITS_RIGHT_ALIGNED),
LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
/* Set DMA transfer size */
LL_DMA_SetDataLength(DMA1,
LL_DMA_STREAM_5,
WAVEFORM_SAMPLES_SIZE);
/* Enable DMA transfer interruption: transfer error */
LL_DMA_EnableIT_TE(DMA1,
LL_DMA_STREAM_5);
/* Note: In this example, the only DMA interruption activated is */
/* transfer error. */
/* If needed, DMA interruptions of half of transfer */
/* and transfer complete can be activated. */
/* Refer to DMA examples. */
/*## Activation of DMA #####################################################*/
/* Enable the DMA transfer */
LL_DMA_EnableStream(DMA1,
LL_DMA_STREAM_5);
}
/**
* @brief Configure timer as a time base (timer instance: TIM6)
* used to trig DAC conversion.
* @note In this DC example, timer instance must be on APB1 (clocked by PCLK1)
* to be compliant with frequency calculation used in this function.
* @param None
* @retval None
*/
void Configure_TIM_TimeBase_DAC_trigger(void)
{
uint32_t timer_clock_frequency = 0; /* Timer clock frequency */
uint32_t timer_prescaler = 0; /* Time base prescaler to have timebase aligned on minimum frequency possible */
uint32_t timer_reload = 0; /* Timer reload value in function of timer prescaler to achieve time base period */
/*## Configuration of NVIC #################################################*/
/* Note: In this example, timer interruptions are not activated. */
/* If needed, timer interruption at each time base period is */
/* possible. */
/* Refer to timer examples. */
/*## Configuration of timer ################################################*/
/* Configuration of timer as time base: */
/* Caution: Computation of frequency is done for a timer instance on APB1 */
/* (clocked by PCLK1) */
/* Timer frequency is configured from the following constants: */
/* - WAVEFORM_TIMER_FREQUENCY: timer frequency (unit: Hz). */
/* - WAVEFORM_TIMER_FREQUENCY_RANGE_MIN: timer minimum frequency possible */
/* (unit: Hz). */
/* Note: Refer to comments at these literals definition for more details. */
/* Retrieve timer clock source frequency */
/* If APB1 prescaler is different of 1, timers have a factor x2 on their */
/* clock source. */
if (LL_RCC_GetAPB1Prescaler() == LL_RCC_APB1_DIV_1)
{
timer_clock_frequency = __LL_RCC_CALC_PCLK1_FREQ(SystemCoreClock, LL_RCC_GetAPB1Prescaler());
}
else
{
timer_clock_frequency = (__LL_RCC_CALC_PCLK1_FREQ(SystemCoreClock, LL_RCC_GetAPB1Prescaler()) * 2);
}
/* Timer prescaler calculation */
/* (computation for timer 16 bits, additional + 1 to round the prescaler up) */
timer_prescaler = ((timer_clock_frequency / (WAVEFORM_TIMER_PRESCALER_MAX_VALUE * WAVEFORM_TIMER_FREQUENCY_RANGE_MIN)) +1);
/* Timer reload calculation */
timer_reload = (timer_clock_frequency / (timer_prescaler * WAVEFORM_TIMER_FREQUENCY));
/* Enable the timer peripheral clock */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM6);
/* Set timer pre-scaler value */
LL_TIM_SetPrescaler(TIM6, (timer_prescaler - 1));
/* Set timer auto-reload value */
LL_TIM_SetAutoReload(TIM6, (timer_reload - 1));
/* Set counter mode */
LL_TIM_SetCounterMode(TIM6, LL_TIM_COUNTERMODE_UP);
/* Note: In this example, timer interruptions are not activated. */
/* If needed, timer interruption at each time base period is */
/* possible. */
/* Refer to timer examples. */
/* Set timer the trigger output (TRGO) */
LL_TIM_SetTriggerOutput(TIM6, LL_TIM_TRGO_UPDATE);
/*## Activation of timer ###################################################*/
/* Enable counter */
LL_TIM_EnableCounter(TIM6);
}
/**
* @brief Configure DAC (DAC instance: DAC1, DAC instance channel: channel1 )
* and GPIO used by DAC channel.
* @note This function configures the DAC channel but does not enable it,
* in order to optimize power consumption (DAC channel enabled only
* when needed).
* @param None
* @retval None
*/
void Configure_DAC(void)
{
LL_DAC_InitTypeDef DAC_InitStruct;
/*## Configuration of GPIO used by DAC channels ############################*/
/* Enable GPIO Clock */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);
/* Configure GPIO in analog mode to be used as DAC output */
LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_4, LL_GPIO_MODE_ANALOG);
/*## Configuration of NVIC #################################################*/
/* Configure NVIC to enable DAC1 interruptions */
NVIC_SetPriority(TIM6_DAC_IRQn, 0);
NVIC_EnableIRQ(TIM6_DAC_IRQn);
/*## Configuration of DAC ##################################################*/
/* Enable DAC clock */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_DAC1);
/* Update fields of initialization structure */
/* Note: Parameter "WaveAutoGenerationConfig" is not set because discarded, */
/* since wave auto generation is disabled. */
DAC_InitStruct.TriggerSource = LL_DAC_TRIG_EXT_TIM6_TRGO;
DAC_InitStruct.WaveAutoGeneration = LL_DAC_WAVE_AUTO_GENERATION_NONE;
DAC_InitStruct.OutputBuffer = LL_DAC_OUTPUT_BUFFER_ENABLE;
/* Initialize DAC instance according to parameters defined in */
/* initialization structure. */
LL_DAC_Init(DAC1, LL_DAC_CHANNEL_1, &DAC_InitStruct);
/* Set the mode for the selected DAC channel */
// LL_DAC_SetMode(DAC1, LL_DAC_CHANNEL_1, LL_DAC_MODE_NORMAL_OPERATION);
/* Enable DAC channel DMA request */
LL_DAC_EnableDMAReq(DAC1, LL_DAC_CHANNEL_1);
/* Enable interruption DAC channel1 underrun */
LL_DAC_EnableIT_DMAUDR1(DAC1);
}
/**
* @brief Perform DAC activation procedure to make it ready to generate
* a voltage (DAC instance: DAC1).
* @note Operations:
* - Enable DAC instance channel
* - Wait for DAC instance channel startup time
* @param None
* @retval None
*/
void Activate_DAC(void)
{
__IO uint32_t wait_loop_index = 0;
/* Enable DAC channel */
LL_DAC_Enable(DAC1, LL_DAC_CHANNEL_1);
/* Delay for DAC channel voltage settling time from DAC channel startup. */
/* Compute number of CPU cycles to wait for, from delay in us. */
/* Note: Variable divided by 2 to compensate partially */
/* CPU processing cycles (depends on compilation optimization). */
/* Note: If system core clock frequency is below 200kHz, wait time */
/* is only a few CPU processing cycles. */
wait_loop_index = ((LL_DAC_DELAY_STARTUP_VOLTAGE_SETTLING_US * (SystemCoreClock / (100000 * 2))) / 10);
while(wait_loop_index != 0)
{
wait_loop_index--;
}
/* Enable DAC channel trigger */
/* Note: DAC channel conversion can start from trigger enable: */
/* - if DAC channel trigger source is set to SW: */
/* DAC channel conversion will start after trig order */
/* using function "LL_DAC_TrigSWConversion()". */
/* - if DAC channel trigger source is set to external trigger */
/* (timer, ...): */
/* DAC channel conversion can start immediately */
/* (after next trig order from external trigger) */
LL_DAC_EnableTrigger(DAC1, LL_DAC_CHANNEL_1);
}
/**
* @brief Initialize LED1.
* @param None
* @retval None
*/
void LED_Init(void)
{
/* Enable the LED1 Clock */
LED1_GPIO_CLK_ENABLE();
/* Configure IO in output push-pull mode to drive external LED1 */
LL_GPIO_SetPinMode(LED1_GPIO_PORT, LED1_PIN, LL_GPIO_MODE_OUTPUT);
/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
//LL_GPIO_SetPinOutputType(LED1_GPIO_PORT, LED1_PIN, LL_GPIO_OUTPUT_PUSHPULL);
/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
//LL_GPIO_SetPinSpeed(LED1_GPIO_PORT, LED1_PIN, LL_GPIO_SPEED_FREQ_LOW);
/* Reset value is LL_GPIO_PULL_NO */
//LL_GPIO_SetPinPull(LED1_GPIO_PORT, LED1_PIN, LL_GPIO_PULL_NO);
}
/**
* @brief Turn-on LED1.
* @param None
* @retval None
*/
void LED_On(void)
{
/* Turn LED1 on */
LL_GPIO_SetOutputPin(LED1_GPIO_PORT, LED1_PIN);
}
/**
* @brief Turn-off LED1.
* @param None
* @retval None
*/
void LED_Off(void)
{
/* Turn LED1 off */
LL_GPIO_ResetOutputPin(LED1_GPIO_PORT, LED1_PIN);
}
/**
* @brief Set LED1 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
* @param Period : Period of time (in ms) between each toggling of LED
* This parameter can be user defined values. Pre-defined values used in that example are :
* @arg LED_BLINK_FAST : Fast Blinking
* @arg LED_BLINK_SLOW : Slow Blinking
* @arg LED_BLINK_ERROR : Error specific Blinking
* @retval None
*/
void LED_Blinking(uint32_t Period)
{
/* Turn LED1 on */
LL_GPIO_SetOutputPin(LED1_GPIO_PORT, LED1_PIN);
/* Toggle IO in an infinite loop */
while (1)
{
LL_GPIO_TogglePin(LED1_GPIO_PORT, LED1_PIN);
LL_mDelay(Period);
}
}
/**
* @brief Configures User push-button in EXTI Line Mode.
* @param None
* @retval None
*/
void UserButton_Init(void)
{
/* Enable the BUTTON Clock */
USER_BUTTON_GPIO_CLK_ENABLE();
/* Configure GPIO for BUTTON */
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_NO);
/* Connect External Line to the GPIO */
USER_BUTTON_SYSCFG_SET_EXTI();
/* Enable a rising trigger EXTI line 13 Interrupt */
USER_BUTTON_EXTI_LINE_ENABLE();
USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
}
/**
* @brief Wait for User push-button press to start transfer.
* @param None
* @retval None
*/
void WaitForUserButtonPress(void)
{
while (ubButtonPress == 0)
{
LL_GPIO_TogglePin(LED1_GPIO_PORT, LED1_PIN);
LL_mDelay(LED_BLINK_FAST);
}
ubButtonPress = 0;
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 180000000
* HCLK(Hz) = 180000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 360
* PLL_P = 2
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 5
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_5);
/* Enable PWR clock */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
/* Activation OverDrive Mode */
LL_PWR_EnableOverDriveMode();
while(LL_PWR_IsActiveFlag_OD() != 1)
{
};
/* Activation OverDrive Switching */
LL_PWR_EnableOverDriveSwitching();
while(LL_PWR_IsActiveFlag_ODSW() != 1)
{
};
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 360, LL_RCC_PLLP_DIV_2);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(180000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 180000000;
}
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
/**
* @brief Function to manage IRQ Handler
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
/* On the first press on user button, update only user button variable */
/* to manage waiting function. */
if(ubButtonPress == 0)
{
/* Update User push-button variable : to be checked in waiting loop in main program */
ubButtonPress = 1;
}
}
/**
* @brief DMA transfer error callback
* @note This function is executed when the transfer error interrupt
* is generated during DMA transfer
* @retval None
*/
void DacDmaTransferError_Callback()
{
/* Error detected during DMA transfer */
LED_Blinking(LED_BLINK_ERROR);
}
/**
* @brief DAC underrun interruption callback
* @note This function is executed when DAC channel underrun error occurs.
* @retval None
*/
void DacUnderrunError_Callback(void)
{
/* Note: Disable DAC interruption that caused this error before entering in */
/* infinite loop below. */
/* Disable interruption DAC channel1 underrun */
LL_DAC_DisableIT_DMAUDR1(DAC1);
/* Error from ADC */
LED_Blinking(LED_BLINK_ERROR);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/