Description
Calculate room to the next page boundary, use the smaller of room and bytes for firstPageBytes, and count any remaining pages by ceiling division.
Address calculations distinguish an occupied last byte from an exclusive end, and alignment rounds to a defined boundary. Element counts and byte counts are not interchangeable.
Calculate room to the next page boundary, use the smaller of room and bytes for firstPageBytes, and count any remaining pages by ceiling division.
When to use this tool
Use Flash Page Crossing Write Budget when you need an explicit address, alignment, page, or transfer-count mapping.
How to use the tool and how it works
- Enter address, bytes, pageSize. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read firstPageBytes, pages. Use the output convention below.
Calculate room to the next page boundary, use the smaller of room and bytes for firstPageBytes, and count any remaining pages by ceiling division. Return zero pages for zero bytes.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| address | Address | Required. Safe integer; minimum 0. |
| bytes | Bytes | Required. Safe integer; minimum 0. |
| pageSize | Page Size | Required. Safe integer; minimum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| firstPageBytes | First Page Bytes | Required. Safe integer. |
| pages | Pages | Required. Safe integer. |
{
"input": {
"address": 250,
"bytes": 20,
"pageSize": 256
},
"output": {
"firstPageBytes": 6,
"pages": 2
}
}Limitations and assumptions
- This counts page coverage only; it does not split a write operation or verify device-specific page behavior.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Validate the resulting span against actual memory bounds and device-specific access and transfer rules.
References
Similar or alternative tools
- Microcontroller: Flash Page Offset Field
Divide the nonnegative addressOffset by positive pageSize, returning a floored pageIndex and offsetWithinPage.
- Microcontroller: DMA Element Count Vs Byte Count
Divide byteCount by bytesPerElement for completeElements and remainingBytes.