Arm

The “Invalid ROM Table” error is a common problem faced by developers when debugging applications on Cortex-M1 chips. This error occurs when the debugger is unable to locate the ROM table entries that contain vital debugging information about the Cortex-M1 core. The ROM table is located in the Cortex-M1 memory map and provides the debugger…

The Cortex-M1 processor from ARM is a popular 32-bit RISC CPU that is widely used in embedded systems. It combines microcontroller features with DSP capabilities, making it well-suited for real-time applications. To aid in development and debugging of Cortex-M1 based systems, Segger Microcontroller offers the ULINK2 debugger. Using the ULINK2 debugger with the Cortex-M1 processor…

The SysTick timer is an essential peripheral found in all Cortex-M processors. It allows precise timing of events and periodic software execution. The SysTick interrupt handler, which executes when the timer expires, is a critical part of any Cortex-M firmware. Well-designed interrupt handlers improve system robustness and determinism. This article provides practical design tips for…

The Cortex-M3 and Cortex-M4 microcontrollers allow for dynamic changing of interrupt priorities at runtime. This provides flexibility in adjusting the priority levels of interrupts in response to application needs. With static interrupt priorities, the priority levels are fixed at compile time and cannot be altered while the application is running. Dynamic priorities enable higher priority…

The Cortex-M processor implements a scheme called “priority masking” to prevent lower priority interrupts from interrupting higher priority code sequences. This is achieved by setting the BASEPRI register to mask interrupts below a certain priority level. For example, setting BASEPRI to 16 prevents interrupts with priority lower than 16 from triggering. This allows critical sections…

Cortex-M microcontrollers allow developers to assign different priority levels to interrupts. This allows high priority interrupts to preempt lower priority ones. Changing the priority of interrupts dynamically at runtime can help optimize interrupt response and overall system performance. Interrupt Priority Levels On Cortex-M processors, interrupts can have 256 priority levels from 0 (highest priority) to…

When working with external RAM on an ARM Cortex-M chip, it is crucial to map the external memory regions correctly using scatter load files. Scatter files provide a flexible and convenient way to define the memory layout for your Cortex-M application, allowing you to specify where code and data sections should be placed in physical…

A scatter load file is an essential component when building applications for ARM Cortex-M based microcontrollers. It defines the memory layout of the target application by specifying the memory regions, their addresses, sizes, and access permissions. A properly configured scatter file ensures code and data are placed correctly for optimum performance and efficiency. What is…

When using an external flash memory with a Cortex-M1 microcontroller, configuring the reset vector appropriately is crucial for the system to boot up and run properly. The reset vector indicates the memory location that contains the first instruction to be executed after a reset event. This 120-word opening paragraph gives a quick answer – the…

When the Cortex-M1 processor encounters a fatal error early in the boot process, it will enter hard fault mode. This indicates there is something seriously wrong with the software or hardware setup. Troubleshooting hard faults can be challenging, but there are a few key things to check that may reveal the underlying problem. Confirm the…