What is use of bit-banding?
Bit-banding is an optional feature of the Cortex-M4 processor. Bit-banding maps a complete word of memory onto a single bit in the bit-band region. For example, writing to one of the alias words sets or clears the corresponding bit in the bit-band region.
What is bit-band memory?
Bit-banding is a term that ARM uses to describe a feature that is available on the Cortex M3 and M4 CPU cores. Basically, the device takes a region of memory (the Bit-band region) and maps each bit in that region to an entire word in a second memory region (the Bit-band Alias Region).
What is the bit-band alias base address of the peripheral region?
BITBAND_PERI_BASE is the base address of bit-band alias region for peripherals. These are the base addresses for the related registers to set the pin high/low from portE (one register to set the pin and one to clear it) and to read a pin value from the portB.
What is bit band operation in Cortex M3?
The bit-band region operation is like that of the ARM Cortex-M3 and ARM Cortex-M4 processors. It maps a complete word of memory onto a single bit in the bit-band region. For example, writing to one of the alias words sets or clears the corresponding bit in the bit-band region.
What are the bit band regions?
What is bit banding and how does it work?
Basically, the device takes a region of memory (the Bit-band region) and maps each bit in that region to an entire word in a second memory region (the Bit-band Alias Region). The benefit of Bit-banding is that a write to a word in the alias region performs a write to the corresponding bit in the Bit-band region.
What is bit banging and how to use it?
Bit banging is used for all kinds of serial communications including; RS-232, Asynchronous Serial Communication, UART, SPI, and I2C. One of the popular implementations of bit banging is the Arduino Software Serial library which enables the Arduino to communicate over UART without using the dedicated hardware UART pins (D0 and D1).
Is bit-banding a race-condition?
This race-condition could lead to undesired behavior. Bit-banding is a term that ARM uses to describe a feature that is available on the Cortex M3 and M4 CPU cores. Basically, the device takes a region of memory (the Bit-band region) and maps each bit in that region to an entire word in a second memory region (the Bit-band Alias Region).
What is bit-banding in ARM Cortex-M3?
In a nutshell, using bit-field variables is more efficient for SRAM but less for flash and the speed of the code execution. To this end, the feature of bit-banding was introduced in ARM Cortex-M3 MCUs to enhance the process considerably. So let’s know more about it!