Studying LED Inversion via GPIO
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0:05Recap and set the stage for the day
0:05Recap and set the stage for the day
0:05Recap and set the stage for the day
1:05Consult the forums1 and switch to the updated Getting Started Guide2
1:05Consult the forums1 and switch to the updated Getting Started Guide2
1:05Consult the forums1 and switch to the updated Getting Started Guide2
6:06Announce patches to the Arch User Repository hifive1-sdk package3
6:06Announce patches to the Arch User Repository hifive1-sdk package3
6:06Announce patches to the Arch User Repository hifive1-sdk package3
10:20Plug Bruce's experimentations with bit banging4
10:20Plug Bruce's experimentations with bit banging4
10:20Plug Bruce's experimentations with bit banging4
15:16Consider investing in a 2.8" TFT Touch Shield5
15:16Consider investing in a 2.8" TFT Touch Shield5
15:16Consider investing in a 2.8" TFT Touch Shield5
18:47Determine to learn how to control LEDs, and look at our TODOs
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18:47Determine to learn how to control LEDs, and look at our TODOs
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18:47Determine to learn how to control LEDs, and look at our TODOs
🖌
20:37Scan through demo_gpio.c for code pertaining to the LEDs and bit banging
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20:37Scan through demo_gpio.c for code pertaining to the LEDs and bit banging
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20:37Scan through demo_gpio.c for code pertaining to the LEDs and bit banging
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25:44Our goal: To be able to disassemble and understand every instruction
25:44Our goal: To be able to disassemble and understand every instruction
25:44Our goal: To be able to disassemble and understand every instruction
27:06Review our understanding of demo_gpio.c
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27:06Review our understanding of demo_gpio.c
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27:06Review our understanding of demo_gpio.c
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30:18Closely read handle_m_time_interrupt() with a view to understanding how it controls the LEDs
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30:18Closely read handle_m_time_interrupt() with a view to understanding how it controls the LEDs
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30:18Closely read handle_m_time_interrupt() with a view to understanding how it controls the LEDs
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36:53Marry up the LED offsets in code with the documentation6
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36:53Marry up the LED offsets in code with the documentation6
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36:53Marry up the LED offsets in code with the documentation6
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41:24Hunt for the GPIO_OUTPUT_VAL
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41:24Hunt for the GPIO_OUTPUT_VAL
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41:24Hunt for the GPIO_OUTPUT_VAL
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46:55Find the GPIO_OUTPUT_VAL address7
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46:55Find the GPIO_OUTPUT_VAL address7
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46:55Find the GPIO_OUTPUT_VAL address7
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49:42Come to understand how the register offsets work
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49:42Come to understand how the register offsets work
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49:42Come to understand how the register offsets work
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51:43Research how the GPIO_REG(GPIO_OUTPUT_VAL) call in handle_m_time_interrupt() sets the LED colour, wondering how it sets intensity
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51:43Research how the GPIO_REG(GPIO_OUTPUT_VAL) call in handle_m_time_interrupt() sets the LED colour, wondering how it sets intensity
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51:43Research how the GPIO_REG(GPIO_OUTPUT_VAL) call in handle_m_time_interrupt() sets the LED colour, wondering how it sets intensity
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1:00:31Peruse the Platform Reference Manual on Input / Out Values and Interrupts8
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1:00:31Peruse the Platform Reference Manual on Input / Out Values and Interrupts8
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1:00:31Peruse the Platform Reference Manual on Input / Out Values and Interrupts8
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1:04:03Continue to research how the GPIO_REG() calls control the LEDs
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1:04:03Continue to research how the GPIO_REG() calls control the LEDs
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1:04:03Continue to research how the GPIO_REG() calls control the LEDs
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1:09:55Read about Output Inversion and Input / Output Values9
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1:09:55Read about Output Inversion and Input / Output Values9
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1:09:55Read about Output Inversion and Input / Output Values9
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1:13:40Determine to test what happens when commenting out the GPIO_REG(GPIO_OUTPUT_EN) call and the leds variable
1:13:40Determine to test what happens when commenting out the GPIO_REG(GPIO_OUTPUT_EN) call and the leds variable
1:13:40Determine to test what happens when commenting out the GPIO_REG(GPIO_OUTPUT_EN) call and the leds variable
1:15:05We are out of time today
1:15:05We are out of time today
1:15:05We are out of time today