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RISCY BUSINESS»Episode Guide
Understanding measure_cpu_freq, get_cpu_freq, & uart_init
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Crowd Supply
HiFive1: Open Source, Arduino-Compatible RISC-V Dev Kit
[1]10:19
SiFive Forums
The Big RISCY BUSINESS Question Thread
[2]32:06
SiFive Developers
Freedom E300 Platform Reference Manual
[3]39:04[4]43:39[5]46:40
[6]50:28
die.net
gcc
[7]57:25
die.net
ld
[8]57:25
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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
2:24Converting a remainder into a decimal
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2:24Converting a remainder into a decimal
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2:24Converting a remainder into a decimal
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10:19Apply the measure_cpu_freq() equation to the specified speeds of our HiFive11
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10:19Apply the measure_cpu_freq() equation to the specified speeds of our HiFive11
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10:19Apply the measure_cpu_freq() equation to the specified speeds of our HiFive11
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20:07Work back through the equation to determine the exact speed of our chip
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20:07Work back through the equation to determine the exact speed of our chip
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20:07Work back through the equation to determine the exact speed of our chip
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23:18Perform integer division with the correction term on our speeds
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23:18Perform integer division with the correction term on our speeds
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23:18Perform integer division with the correction term on our speeds
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27:04Miblo /me slips into le stream
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27:04Miblo /me slips into le stream
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27:04Miblo /me slips into le stream
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27:07Continue with the integer division
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27:07Continue with the integer division
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27:07Continue with the integer division
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29:53Try to rearrange the calculation avoiding the correction term
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29:53Try to rearrange the calculation avoiding the correction term
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29:53Try to rearrange the calculation avoiding the correction term
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32:06Ask on the forums2 why we couldn't just rearrange the computation
32:06Ask on the forums2 why we couldn't just rearrange the computation
32:06Ask on the forums2 why we couldn't just rearrange the computation
37:05miblo Does their code handle an arbitrary number of decimal places, while ours can't, perhaps?
🗪
37:05miblo Does their code handle an arbitrary number of decimal places, while ours can't, perhaps?
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37:05miblo Does their code handle an arbitrary number of decimal places, while ours can't, perhaps?
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39:04Review our understanding of init.c and resume studying uart_init()3
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39:04Review our understanding of init.c and resume studying uart_init()3
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39:04Review our understanding of init.c and resume studying uart_init()3
📖
43:39Read about the Transmit Control Register4
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43:39Read about the Transmit Control Register4
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43:39Read about the Transmit Control Register4
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46:40Determine that we fully understand uart_init() and look at the UART0_REG() macro5
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46:40Determine that we fully understand uart_init() and look at the UART0_REG() macro5
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46:40Determine that we fully understand uart_init() and look at the UART0_REG() macro5
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50:28Marry up the UART_REG_DIV and UART_REG_TXCTRL macros with the documentation6
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50:28Marry up the UART_REG_DIV and UART_REG_TXCTRL macros with the documentation6
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50:28Marry up the UART_REG_DIV and UART_REG_TXCTRL macros with the documentation6
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51:47Return to demo_gpio.c and hunt for the write() function called by print_instructions()
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51:47Return to demo_gpio.c and hunt for the write() function called by print_instructions()
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51:47Return to demo_gpio.c and hunt for the write() function called by print_instructions()
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57:25Consult man gcc7 and man ld8 to learn how --wrap works
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57:25Consult man gcc7 and man ld8 to learn how --wrap works
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57:25Consult man gcc7 and man ld8 to learn how --wrap works
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59:34Read __wrap_write() and __wrap_isatty()
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59:34Read __wrap_write() and __wrap_isatty()
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59:34Read __wrap_write() and __wrap_isatty()
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1:01:19Hunt for our copy of unistd.h
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1:01:19Hunt for our copy of unistd.h
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1:01:19Hunt for our copy of unistd.h
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1:09:00Read the standard file descriptors in posix/unistd.h
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1:09:00Read the standard file descriptors in posix/unistd.h
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1:09:00Read the standard file descriptors in posix/unistd.h
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1:10:05Continue studying __wrap_write()
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1:10:05Continue studying __wrap_write()
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1:10:05Continue studying __wrap_write()
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1:11:52We are out of time for today
1:11:52We are out of time for today
1:11:52We are out of time for today