using 12 external interrupts and 1 USART receive interrupt and 6 ADC channels to monitor, using stm32f103zet6

[raghu rajput]

Posted on July 14, 2018 at 09:23

I have a requirement to use 12 external interrupts and 1 USART receive interrupt and 6 ADC channels to monitor. i am using stm32f103zet6. is this choice good for my requirements ? also i need help to program different interrupts all together:

I want to make a program to read 12 external interrupts which almost occurs at same time . and at any given time it should receive USART interrupt and halt the process.

and on USART, how can i receive data of unknown length ?

Experts, Please help

#stm32-stm32f103-stm32f103ze

[T J]

Posted on July 16, 2018 at 01:14

that's an old chip. although any chip will do the same work, just a speed issue.

what is your primary reason for choosing that chip ? 

12 interrupts on pins? what are you trying to read ? buttons or signals ? 

what is the max frequency here ?

ADC DMA easy enough,

Uart DMA easy stuff

I suggest the F072 if you want USB or the F091 if you dont.

H7xx if you want to be blazingly fast.

[AvaTar]

Posted on July 16, 2018 at 07:29

... to read 12 external interrupts which almost occurs at same time .

This is not really very specific. A delay of 1 ms is 'at the same time' for human senses, but quite long for a 72MHz MCU.

... and at any given time it should receive USART interrupt and halt the process.

and on USART, how can i receive data of unknown length ?

You can priorize the interrupts properly, so that the UART interrupt preempts the EXTI.

And receiving UART data of unknown sentence length is a 'standard' task. In the receive interrupt, check each character for the sentence start/end. Don't do heavy processing in the interrupt, rather set a flag for the main loop code, and copy the receive data.

[raghu rajput]

Posted on July 16, 2018 at 08:42

1)I chose STM32F103ZET6 LQFP144 because of more GPIO pins as i need more

than 20GPIOs and also i needed 12 External interrupt pins, 6 ADC pins and 3

UARTs.

2)Frequency is like,for every one second , the proximity 6 sensors give

signal to 6 pins and other 6 external interrupts which are switches.

Inshort, 12 external interrupts occur nearly at the same time

I am trying to read 6 signals from individual proximity sensor.

Best Regards

Raghavendra Rajput

E-rachit technologies Pvt Ltd