I am using the arm m7, however I would like to use a cheaper processor to realize the following structure: 1- i2c output for OLED communication 2- two usart ports one for gps communication and one for gprs 3- a Gpio for communication with sensor. I am in doubt between the m0 +, m23, m3. However if you have any other suggestions I would be grateful.
See my answer and use you favorite search engine or the one on the manufactures side.
Again, "cheap" is not precise. Neither is the rest you tell.BTW: Do not use "Insert Code" for normal text.