Work on random number generator

[josesimoes]

Description

• Implement interface for hardware random generator in STM32 targets (strong implementation of existing weak random)

Motivation and Context

• Replace pseudo random generator with newlib nano rand() implementation
• Closes Implement random number generator with hardware support Home#123
• Closes Evaluate the replacement of CLR_RT_Random with calls to NewLibC Home#124

How Has This Been Tested?

• System.Random app from samples repo

Output using newlib rand()

-- 10 random integers between 0 and 100 --
69
79
11
70
27
28
0
10
93
66

-- 10 random integers between 0 and 999999 --
971936
562964
469367
400275
808434
566033
951456
684178
926690
36534

-- 10 random doubles --
0.096457387831275068
0.98327366401593841
0.91643186235634233
0.53871225218228636
0.065404424474297285
0.23429514944287722
0.082870655266042176
0.80382189098923551
0.53989917903202544
0.81513274079893383

-- 10 random numbers from array --
57
99
38
46
93
236
158
199
104
183

Output using hardware random generator

-- 10 random integers between 0 and 100 --
60
99
90
24
44
33
4
25
12
69

-- 10 random integers between 0 and 999999 --
811207
695039
54885
100920
772318
844083
263480
587971
989447
613734

-- 10 random doubles --
0.12095915994629244
0.208135329002546
0.61765822410063309
0.84031696753583773
0.60034945970409304
0.98402133932896452
0.23056060965884492
0.77650020778563345
0.18943352419636994
0.64050802649941951

-- 10 random numbers from array --
112
1
125
153
188
69
98
23
44
146

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Signed-off-by: josesimoes [email protected]

[nfbot]

Hi @josesimoes,

I'm nanoFramework bot.
Thank you for your contribution!

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