mirror of https://github.com/OpenIPC/wiki.git
28 lines
749 B
Markdown
28 lines
749 B
Markdown
# OpenIPC Wiki
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[Table of Content](../README.md)
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SigmaStar SoC research and debugging notes
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------------------------------------------
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#### Control PWM channels on SigmaStar SSC338Q
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Switch GPIO1 to PWM1 mode and set parameters
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```
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devmem 0x1F207994 16 0x1121
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echo 1 > /sys/class/pwm/pwmchip0/export
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echo 10000 > /sys/class/pwm/pwmchip0/pwm1/period
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echo 25 > /sys/class/pwm/pwmchip0/pwm1/duty_cycle
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echo 1 > /sys/class/pwm/pwmchip0/pwm1/enable
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```
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#### Control PWM IR led on 8232SWC-WE-B device, SSC335DE
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```
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# set PWM4 on GPIO4
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devmem 0x1f203C1C w 0x3000
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echo 4 > /sys/class/pwm/pwmchip0/export
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echo 40000 > /sys/class/pwm/pwmchip0/pwm4/period
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echo 40 > /sys/class/pwm/pwmchip0/pwm4/duty_cycle
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echo 1 > /sys/class/pwm/pwmchip0/pwm4/enable
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```
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