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RISCY BUSINESS»Episode Guide
uart_init, get_cpu_freq, & `static` Legalese
References ▼
SiFive Developers
SiFive HiFive1 Getting Started Guide
[1]2:30[4]10:49[6]21:38
SiFive Developers
Freedom E310-G000 Manual
[2]8:34
SiFive Developers
Freedom E300 Platform Reference Manual
[3]8:34
YouTube
RISCY BUSINESS - Day 27: Diving Into Pulse Width Modulation
[5]14:09
ISO/​IEC 9899:201x
[7]41:36[8]53:08
SiFive Forums
The Big RISCY BUSINESS Question Thread
[9]59:04
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0:07Recap and set the stage for the day
0:07Recap and set the stage for the day
0:07Recap and set the stage for the day
2:30Consult Table 7.1: HiFive1 GPIO Offset to Board Pin Number, and locate the definition of IOF0_UART0_MASK1
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2:30Consult Table 7.1: HiFive1 GPIO Offset to Board Pin Number, and locate the definition of IOF0_UART0_MASK1
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2:30Consult Table 7.1: HiFive1 GPIO Offset to Board Pin Number, and locate the definition of IOF0_UART0_MASK1
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6:17Return to uart_init() and determine to understand how IOF0_UART0_MASK is being used
6:17Return to uart_init() and determine to understand how IOF0_UART0_MASK is being used
6:17Return to uart_init() and determine to understand how IOF0_UART0_MASK is being used
8:34Refresh our memory on the GPIO Complex2 and HW I/O Functions (IOF)3
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8:34Refresh our memory on the GPIO Complex2 and HW I/O Functions (IOF)3
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8:34Refresh our memory on the GPIO Complex2 and HW I/O Functions (IOF)3
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10:49Assume the layout of the IOF select register4
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10:49Assume the layout of the IOF select register4
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10:49Assume the layout of the IOF select register4
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14:09Consult the annotations for IOF5
14:09Consult the annotations for IOF5
14:09Consult the annotations for IOF5
17:44Refresh our memory on the IOF masks for the LEDs
17:44Refresh our memory on the IOF masks for the LEDs
17:44Refresh our memory on the IOF masks for the LEDs
21:38Match up our IOF0_UART0_MASK in code with the documentation6
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21:38Match up our IOF0_UART0_MASK in code with the documentation6
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21:38Match up our IOF0_UART0_MASK in code with the documentation6
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25:23Critique the clarity of using masks instead of offsets for UART0
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25:23Critique the clarity of using masks instead of offsets for UART0
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25:23Critique the clarity of using masks instead of offsets for UART0
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29:09Consider what the static keyword does in terms of zero initialisation
29:09Consider what the static keyword does in terms of zero initialisation
29:09Consider what the static keyword does in terms of zero initialisation
41:36Consult the C11 spec for the default initialisation rule of locally scoped static variables7
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41:36Consult the C11 spec for the default initialisation rule of locally scoped static variables7
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41:36Consult the C11 spec for the default initialisation rule of locally scoped static variables7
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53:08Read section 5.1.2 "Execution environments" in C11 spec, and determine to confirm with SiFive whether their static implementation does zero initialise8
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53:08Read section 5.1.2 "Execution environments" in C11 spec, and determine to confirm with SiFive whether their static implementation does zero initialise8
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53:08Read section 5.1.2 "Execution environments" in C11 spec, and determine to confirm with SiFive whether their static implementation does zero initialise8
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56:56Read about how the uninitialised .bss segment in Linux executables, which holds global and static variables, initialises variables to zero
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56:56Read about how the uninitialised .bss segment in Linux executables, which holds global and static variables, initialises variables to zero
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56:56Read about how the uninitialised .bss segment in Linux executables, which holds global and static variables, initialises variables to zero
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57:59Recommend not explicitly initialising static and global variables to 0 to save some space
🎲
57:59Recommend not explicitly initialising static and global variables to 0 to save some space
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57:59Recommend not explicitly initialising static and global variables to 0 to save some space
🎲
59:04Ask in the forums where it is defined how uninitialised variables with static storage duration are initialized for the HiFive19
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59:04Ask in the forums where it is defined how uninitialised variables with static storage duration are initialized for the HiFive19
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59:04Ask in the forums where it is defined how uninitialised variables with static storage duration are initialized for the HiFive19
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1:05:18We are out of time for tonight
1:05:18We are out of time for tonight
1:05:18We are out of time for tonight