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/**
******************************************************************************
* @file Examples_LL/DAC/DAC_GenerateConstantSignal_TriggerSW/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use the DAC peripheral to generate
* a constant voltage signal.
* This example is based on the STM32F4xx DAC LL API;
* Peripheral initialization done using LL unitary services functions.
******************************************************************************
* @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_GenerateConstantSignal_TriggerSW
* @{
*/
/* 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))
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint8_t ubButtonPress = 0;
__IO uint8_t ubButtonPressCount = 0;
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Configure_DAC(void);
void Activate_DAC(void);
void LED_Init(void);
void LED_On(void);
void LED_Off(void);
void LED_Toggle(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 DAC channel */
Configure_DAC();
/* Activate DAC channel */
Activate_DAC();
/* Turn-on LED1 */
LED_On();
/* Infinite loop */
while (1)
{
/* Note: LED state depending and DAC channel output are set into */
/* function "UserButton_Callback()". */
}
}
/**
* @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).
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @param None
* @retval None
*/
void Configure_DAC(void)
{
/*## 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);
/* Set the mode for the selected DAC channel */
// LL_DAC_SetMode(DAC1, LL_DAC_CHANNEL_1, LL_DAC_MODE_NORMAL_OPERATION);
/* Select trigger source */
LL_DAC_SetTriggerSource(DAC1, LL_DAC_CHANNEL_1, LL_DAC_TRIG_SOFTWARE);
/* Set the output for the selected DAC channel */
//LL_DAC_SetOutputBuffer(DAC1, LL_DAC_CHANNEL_1, LL_DAC_OUTPUT_BUFFER_ENABLE);
/* Disable DAC channel DMA request */
// LL_DAC_DisableDMAReq(DAC1, LL_DAC_CHANNEL_1);
/* Set the data to be loaded in the data holding register */
// LL_DAC_ConvertData12RightAligned(DAC1, LL_DAC_CHANNEL_1, 0x000);
/* 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;
/* Force the default value to be loaded in the data holding register after reset system */
LL_DAC_ConvertData12RightAligned(DAC1, LL_DAC_CHANNEL_1, 0x00);
/* 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 Toggle LED1.
* @param None
* @retval None
*/
void LED_Toggle(void)
{
/* Toggle LED1 */
LL_GPIO_TogglePin(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);
}
}
/**
* @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)
{
uint32_t tmp_dac_value = 0;
/* On the first press on user button, update only user button variable */
/* to manage waiting function. */
/* Then, on next presses on user button, update DAC settings. */
if(ubButtonPress == 0)
{
/* Update User push-button variable : to be checked in waiting loop in main program */
ubButtonPress = 1;
}
else
{
ubButtonPressCount++;
/* Set value for DAC output */
if(ubButtonPressCount < 4)
{
/* Increase amplitude by a quarter each time button is pushed */
tmp_dac_value = DIGITAL_SCALE_12BITS * ubButtonPressCount/4;
/* Toggle LED2 */
LED_Toggle();
}
else
{
/* Final amplitude: end of example */
tmp_dac_value = DIGITAL_SCALE_12BITS;
/* Turn-on LED2 */
LED_On();
}
/* Set the data to be loaded in the data holding register */
LL_DAC_ConvertData12RightAligned(DAC1, LL_DAC_CHANNEL_1, tmp_dac_value);
/* Trig DAC conversion by software */
LL_DAC_TrigSWConversion(DAC1, LL_DAC_CHANNEL_1);
}
}
/**
* @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
/**
* @}
*/
/**
* @}
*/