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SR/AI
SR/AP
Hardware Reference
Release r09
Page 19 of 76
Therefore the baud rate deviation can be calculated by the following procedure, for which
Stollmann provides a tool at
http://www.stollmann.de/uploads/media/BlueMod_SR_uart_baudrate_calculator.html
𝐷𝐼𝑉 =
14.745.600
16 𝐶𝐵𝑅
𝑀𝐴𝑁𝑇𝐼𝑆𝑆𝐴 = 𝑚𝑎𝑡ℎ. 𝑓𝑙𝑜𝑜𝑟 (𝐷𝐼𝑉)
𝐹𝑅𝐴𝐶𝑇𝐼𝑂𝑁 = 𝑚𝑎𝑡ℎ. 𝑟𝑜𝑢𝑛𝑑 [16(𝐷𝐼𝑉 − 𝑀𝐴𝑁𝑇𝐼𝑆𝑆𝐴)
If FRACTION > 15
MANTISSA := MA 1
FRACTION := 0
𝐵𝑅
𝐻𝑧
=
14.745.600
16 [𝑀𝐴𝑁𝑇𝐼𝑆𝑆𝐴 +
𝐹𝑅𝐴𝐶𝑇𝐼𝑂𝑁
16
]
𝐷𝑒𝑣𝑖𝑎𝑡𝑖𝑜𝑛
%
= 100 𝑚𝑎𝑡ℎ. 𝑎𝑏𝑠 [
𝐶𝐵𝑅 − 𝐵𝑅
𝐶𝐵𝑅
]
Explanation of used functions and expressions
1) math.floor(x)
returns the largest integer less than or equal to x
2) math.round(x)
returns a number of x rounded to the nearest integer
3) math.abs(x)
returns the absolute value of x
4) DIV
floating variable
5) CBR
targeted customer baud rate
6) BR
actual resulting baud rate
7) MANTISSA
unsigned int12 baud rate register value
8) FRACTION
unsigned int4 baud rate register value
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