Stm32f4 Hal Disable Interrupt Gpio
ADC help configuring interrupt and triggering STM32f4 Reply to Thread Discussion in 'Microcontrollers, Programming and IoT' started by victorrr, May 4, 2015. STM32F4 Discovery ADC continuous conversion single channel Julio Cesar Molina Saqui Hi everybody, I've started to use the STM32F4 Discovery, now I'm trying to use the ADC as single channel in conitnuous mode without DMA, i doesn't work, is it posible to do it? I am not experienced with HAL but with my eamples you can adapting it to your code. First code is ON-OFF Led every 1 second. You change it to 2 ms. Next code is ADC settings for 2 channels sampling - change it to 3 channels. Every time timer goes to interrupt executes third code example (add your third channel ).
STMs Application Note AN3116 explains the different operating modes quite nicely but fails to address any practical considerations of their implementation. For an overview, I am just reviewing the properties shortly. The ADC can perform a single conversion, or continuously convert values. The conversion can be performed on a single channel or multiple channels. The latter is referred to as scan configuration.
The permutation of these modes gives the different operating modes. Single-channel & single-conversion. Multi-channel (scan) & multiple-conversion. Single-channel & continuous operation.
Multi-channel (scan) & continuous operationEach of the four modes can be triggered by modifying a memory-mapped register or an external trigger such as a timer. In any mode the sample time per channel can be specified as number of ADC clock steps. Furthermore, the STM32F4 contains an analog watchdog that triggers an interrupt when values fall outside a specified range. In any case interrupts can be used to signal the completion of a conversion.The first mode performs a single conversion on a single channel when triggered and then stops.
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This can be used to measure a calibration value or perform checks between different program states.The second mode performs a scan conversion, reading one channel after the other (of up to 16 channels in a single scan). This is very useful to capture sensor data at discrete points in time such as positions.The third mode converts a single channel continuously. This can be useful to get data on a critical analog input.The last mode is just scan conversion performed continuously.Setup DescriptionBeing an ARM processor, peripherals need to be clocked to be switched on. This applies to all components that have anything to do with the clock configuration. Again the STM32 being high-end MCU from STM makes the clock three a bit of a Maze (at the time of writing to be found in Reference Manual 90, Figure 9).Use their clock configuration utility that actually generates you the initialisation code; or, be brave, print the page and determines the register value yourself. Once the clock itself is set up, the individual peripherals can be enabled with the RCCxxx functions, depending on the bus they are connected to.In this example we use ADC1, which is connected to Advanced Peripheral Bus 2 (APB2), which is a subdivision of the ARM AMBA high-performance bus (AHB). In this example it is assumed that the main clock is configured at 168 MHz and that APB2 runs at 84 MHz.
Furthermore to constrain the scope just to the ADC we use the internal reference channels VREFint and Temperature as input for our experiments.Single-Conversion Mode. So far we have just discussed examples that read off the on-chip channels. We modify the previous example to add three additional external pins as input to the ADC. We have chosen ADCIN 10. 12, which are mapped to PORTC 0. Note the pin mapping can be obtained from the datasheet of your STM32F4 chip. So far we have discussed the different operating modes of the ADC that are triggered by software.
Stm32f4 Hal Disable Interrupt Gpio File
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Stm32f Gpio Interrupt
In addition to those modes the ADC can also be triggered by an external pin or a timer source. In this example, we will demonstrate how to modify the code of the previous example to be triggered from a timer.In this case we enable Timer2 to provide the clock for the ADC. To synchronize the transfer we enable the interrupt of timer two. Note any timer is likely connected to a different part of the AHB bus structure than the ADC; it is always wise to look at the clock tree and validate the clock configuration.
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