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How to make GPIO Signals to Control Hardware
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M5Stack User Meeting Vol.7 at Shiodome, Tokyo 2020/Feb/4
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How to make GPIO Signals to Control Hardware
1.
5 7 2020/2/4
2.
16 5 5940 M5Stack
3.
4.
TLC5940 74HC595 TBD62783 8 Anodes for
each Module 16 Cathodes of each Segment GSCLK BLANK XLAT SCLK S-IN S-OUT
5.
LED 0 LED
1 LED 2 LED 3 LED 4 LED 5 LED 6 LED 7 16ms ( > 60Hz) 2ms ~GSCLK BLANK = LED off XLAT = Latch SCLKS-IN 4096 pulse / 2ms → 2MHz PWM data: 12bit x 16segment
6.
7.
BLANK XLAT SCLK GSCLK BLANK, XLAT: 2.048ms
8.
BLANK XLAT SCLK GSCLK XLAT: 112ns BLANK: 328ns GSCLK:
2MHz 124ns/376ns
9.
BLANK XLAT SCLK GSCLK SCLK: 8MHz 60ns/65ns
10.
32
11.
LEDC Channel 0 GSCLK 2MHz0-3164MHz
25% Divider Counter APB_CLK 80MHz Duty Channel GPIO2 Frequency (2MHz) Resolution (5bit) Duty (8/32) LEDC Channel(0) --> GPIO(2) Resolution Frequency × 2 <= APB_CLK 2MHz × 32 = 64MHz < 80MHz
12.
Timer 0 2.05ms1MHz Divider Counter APB_CLK 80MHz App-CPU Divider (80) Alarm (2050
count) Interrupt Interrupt Handler - digitalWrite BLANK XLATGPIO15 GPIO12
13.
Timer 0 2.05ms App-CPU Interrupt Interrupt Handler -
digitalWrite - SemaphoreGive Non-privileged Task - SemaphoreTake - Make data - Send data Resume
14.
TLC5940 GPIO5 GPIO23(MOSI) GPIO18(SCK) GPIO4 GPIO14 S-IN SCLK SS(Slave Select) LCD
15.
16.
ハードウェア・タイマがダントツで優秀
17.
5940
18.
120 16 4096 2005. TLC5940 Constant Current Driver PWM Control Register 12bit Serial Data Interface 16 channels LEDs MCU PWP NT GSCLK (Gray
–Scale Clock)
19.
25% 50% 75% Pulse Cycle Duty OffOn Time Current
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