![]() The following is a simplified example, but the principle is the same with all examples I found. So let’s have a look at the standard code. The standard code used to program UARTs on ARM microcontrollers contains a bug that prevents the processor from properly supporting any baud rates above 115,200 bits/sec.Īnd the cause of the problem is very obvious (once you know what it is). In addition, I have seen forum inquiries pointing to similar problems with the Raspberry Pi 2 which uses a 900 Mhz Quad Core ARM Cortex-A7 CPU. I am not a hardware specialist, but I believe the UART programming is somewhat universal between all ARM processor types. And yes, they are all Cortex M3 processors. I have encountered baud rate problems using embedded systems with the NXP LPC1754 and LPC1768 as well as the Arduino Due with its Atmel SAM3X8E ARM Cortex-M3 CPU. The outcome depends primarily on thorough testing of serial communication applications, but there is evidence to the contrary in popular systems like the Arduino Due and the Raspberry Pi. To say it upfront, I cannot confirm with 100% certainty that all ARM Cortex microcontrollers are affected by the UART programming problem as described in the following, but there are indications that make my assumption very probable. CANCrocodile - Contactless CAN Bus Monitoring.CAN Bus, CAN FD, CANopen, SAE J1939, LIN Bus Prototyping Solutions For Embedded Systems.PICAN CAN Bus HAT For Raspberry Pi - Selection Guide.CAN, SAE J1939, NMEA 2000 Projects with the Arduino Due - Source Code Included. ![]()
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