How to design a program that can collect sensor arrays using STM32?

EdwardsThompson

How to design a program that can collect sensor arrays using STM32? [Copy link]

As the title says, the project needs to collect the pressure of a contact surface, use a sensor array, and use analog switches to switch and scan the rows. How should such a program be designed? My idea is ADC collection + DMA transmission. After DMA transfers a row of data, implement channel switching in the DMA interrupt? I wonder if this is feasible? Another method is TIM+ADC+DMA. Use TIM to trigger ADC and control the sampling rate of ADC. ADC_RegularChannelConfig(ADC1, ADC_Channel_9,10, ADC_SampleTime_480Cycles); Does this sentence control the sampling rate of ADC? It already exists, so why can we use TIM timer to control its sampling rate? When TIM is used to control the sampling rate of ADC, what is the difference between the two marked triggering methods? /* ADC1 regular channel 12 configuration **********************************/ ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ScanConvMode = ENABLE; //ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//áD￡êêê2′ ADC_InitStructure.ADC_ContinuousConvMode=DISABLE; ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;//_TRGO timer trigger? ? ? // ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2;//What is the difference with the above? ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfConversion =10; ADC_Init(ADC1, &ADC_InitStructure); // /* Enable ADC1 DMA */ // ADC_DMACmd(ADC1, ENABLE);

wsdymg

Usually, the multi-channel AD of the MCU is multiplexed. If a single channel always occupies the AD, the resources will be wasted. The sampling rate and reading frequency of each channel can be configured. For example, the sampling rate of CH1 is configured to 100Khz, the sampling rate of CH2 is configured to 50Khz, the overflow interrupt of TIM1 is used as the trigger source, and then the overflow frequency is configured to 10HZ, that is, the MCU will read the data of CH1 and CH2 10 times per second. ADC_SampleTime_480Cycles is related to the sampling rate, and ADC_ExternalTrigConv_T2_TRGO is related to the frequency of your data reading. See the figure for the interrupt source configuration.

EdwardsThompson

wsdymg posted on 2018-3-22 03:52 Usually the multi-channel AD of the microcontroller are multiplexed. If a single channel always occupies the AD, the resources are wasted. The sampling rate and reading frequency of each channel can be...

Thank you for your answer, I learned a lot!