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Studying LED Inversion via GPIO

Studying LED Inversion via GPIO ⚠ Click here to regain focus ⚠
References ▼
SiFive Forums
Lots of Questions… (RISCY BUSINESS Day 21)
[1]1:05
SiFive Developers
SiFive HiFive1 Getting Started Guide
[2]1:05[6]36:53
SiFive Forums
Arch Linux and the HiFive1
[3]6:06
YouTube
Bit banging a GPIO on HiFive1
[4]10:20
adafruit
2.8" TFT Touch Shield for Arduino with Resistive Touch Screen
[5]15:16
SiFive Developers
Platform Reference Manual
[7]46:55[8]1:00:31[9]1:09:55
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Mio Iwakura
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Matt Mascarenhas
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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
18:47Determine to learn how to control LEDs, and look at our TODOs
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
20:37Scan through demo_gpio.c for code pertaining to the LEDs and bit banging
20:37Scan through demo_gpio.c for code pertaining to the LEDs and bit banging
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
27:06Review our understanding of demo_gpio.c
27:06Review our understanding of demo_gpio.c
30:18Closely read handle_m_time_interrupt() with a view to understanding how it controls the LEDs
30:18Closely read handle_m_time_interrupt() with a view to understanding how it controls the LEDs
30:18Closely read handle_m_time_interrupt() with a view to understanding how it controls the LEDs
36:53Marry up the LED offsets in code with the documentation6
36:53Marry up the LED offsets in code with the documentation6
36:53Marry up the LED offsets in code with the documentation6
41:24Hunt for the GPIO_OUTPUT_VAL
41:24Hunt for the GPIO_OUTPUT_VAL
41:24Hunt for the GPIO_OUTPUT_VAL
46:55Find the GPIO_OUTPUT_VAL address7
46:55Find the GPIO_OUTPUT_VAL address7
46:55Find the GPIO_OUTPUT_VAL address7
49:42Come to understand how the register offsets work
49:42Come to understand how the register offsets work
49:42Come to understand how the register offsets work
51:43Research how the GPIO_REG(GPIO_OUTPUT_VAL) call in handle_m_time_interrupt() sets the LED colour, wondering how it sets intensity
51:43Research how the GPIO_REG(GPIO_OUTPUT_VAL) call in handle_m_time_interrupt() sets the LED colour, wondering how it sets intensity
51:43Research how the GPIO_REG(GPIO_OUTPUT_VAL) call in handle_m_time_interrupt() sets the LED colour, wondering how it sets intensity
1:00:31Peruse the Platform Reference Manual on Input / Out Values and Interrupts8
1:00:31Peruse the Platform Reference Manual on Input / Out Values and Interrupts8
1:00:31Peruse the Platform Reference Manual on Input / Out Values and Interrupts8
1:04:03Continue to research how the GPIO_REG() calls control the LEDs
1:04:03Continue to research how the GPIO_REG() calls control the LEDs
1:04:03Continue to research how the GPIO_REG() calls control the LEDs
1:09:55Read about Output Inversion and Input / Output Values9
1:09:55Read about Output Inversion and Input / Output Values9
1:09:55Read about Output Inversion and Input / Output Values9
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