Created
February 1, 2022 10:40
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TinyGo + Wio Terminal + LCD_BACKLIGHT
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| package main | |
| import ( | |
| "device/sam" | |
| "log" | |
| "machine" | |
| "time" | |
| ) | |
| func main() { | |
| err := run() | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| } | |
| func run() error { | |
| err := initialize() | |
| if err != nil { | |
| return err | |
| } | |
| led := machine.LED | |
| led.Configure(machine.PinConfig{Mode: machine.PinOutput}) | |
| brightness := uint8(0) | |
| for { | |
| led.Toggle() | |
| if true { | |
| setBrightness(brightness) | |
| brightness = (brightness + 10) % maxBrightness | |
| } | |
| time.Sleep(100 * time.Millisecond) | |
| } | |
| return nil | |
| } | |
| var ( | |
| maxBrightness = uint8(200) | |
| currentBrightness = uint8(50) | |
| ) | |
| func initialize() error { | |
| // enable peripheral clocks | |
| sam.GCLK.PCHCTRL[sam.PCHCTRL_GCLK_TC0].SetBits(sam.GCLK_PCHCTRL_CHEN) | |
| for !sam.GCLK.PCHCTRL[sam.PCHCTRL_GCLK_TC0].HasBits(sam.GCLK_PCHCTRL_CHEN) { | |
| } | |
| sam.GCLK.PCHCTRL[sam.PCHCTRL_GCLK_EVSYS0].SetBits(sam.GCLK_PCHCTRL_CHEN) | |
| for !sam.GCLK.PCHCTRL[sam.PCHCTRL_GCLK_EVSYS0].HasBits(sam.GCLK_PCHCTRL_CHEN) { | |
| } | |
| sam.GCLK.PCHCTRL[sam.PCHCTRL_GCLK_CCL].SetBits(sam.GCLK_PCHCTRL_CHEN) | |
| for !sam.GCLK.PCHCTRL[sam.PCHCTRL_GCLK_CCL].HasBits(sam.GCLK_PCHCTRL_CHEN) { | |
| } | |
| sam.MCLK.APBAMASK.SetBits(sam.MCLK_APBAMASK_TC0_) | |
| sam.MCLK.APBBMASK.SetBits(sam.MCLK_APBBMASK_EVSYS_) | |
| sam.MCLK.APBCMASK.SetBits(sam.MCLK_APBCMASK_CCL_) | |
| // /* Configure PORT */ | |
| sam.PORT.GROUP[2].DIRSET.Set(1 << 5) | |
| sam.PORT.GROUP[2].EVCTRL.Set(0x85) // PC05, OUT | |
| // /* Configure EVSYS */ | |
| sam.EVSYS.USER[1].Set(0x01) // Channel0 -> PORT_EV0 | |
| sam.EVSYS.CHANNEL[0].CHANNEL.Set(0x74 | (0x02 << 8) | (0x00 << 10)) // CCL_LUTOUT0, ASYNCHRONOUS, NO_EVT_OUTPUT | |
| // /* Configure CCL */ | |
| sam.CCL.CTRL.Set(1 << 0) // SWRST | |
| sam.CCL.SEQCTRL[0].Set(0x00) // Disable SEQCTRL | |
| sam.CCL.LUTCTRL[0].Set((0xAA << 24) | (0x01 << 22) | (0x06 << 8) | (0x01 << 1)) // TRUTH=0xAA, LUTEO, INSEL0=0x06(TC), ENABLE | |
| sam.CCL.CTRL.Set(1 << 1) // ENABLE | |
| // /* Configure TC0 */ | |
| sam.TC0_COUNT8.CTRLA.Set(1 << 0) // SWRST | |
| for sam.TC0_COUNT8.CTRLA.HasBits(1 << 0) { | |
| } | |
| sam.TC0_COUNT8.CTRLA.Set((1 << 2) | (1 << 4) | (4 << 8)) // MODE=COUNT8, PRESCALER=DIV16, PRESCSYNC=PRESC | |
| sam.TC0_COUNT8.WAVE.Set(0x02) // WAVEGEN=NPWM | |
| sam.TC0_COUNT8.CTRLBSET.Set(1 << 1) // LUPD | |
| sam.TC0_COUNT8.PER.Set(maxBrightness) | |
| sam.TC0_COUNT8.CC[0].Set(currentBrightness) | |
| sam.TC0_COUNT8.CC[1].Set(0) | |
| sam.TC0_COUNT8.DBGCTRL.SetBits(sam.TC_COUNT8_DBGCTRL_DBGRUN) | |
| sam.TC0_COUNT8.INTFLAG.Set(0x33) | |
| for sam.TC0_COUNT8.SYNCBUSY.HasBits(0x80 | 0x40 | 0x10 | 0x0F) { | |
| } | |
| sam.TC0_COUNT8.CTRLA.Set(1 << 1) // ENABLE | |
| for sam.TC0_COUNT8.SYNCBUSY.HasBits(0x02) { | |
| } | |
| return nil | |
| } | |
| func setBrightness(brightness uint8) { | |
| if brightness < maxBrightness { | |
| currentBrightness = brightness | |
| } | |
| sam.TC0_COUNT8.CC[0].Set(currentBrightness) | |
| for sam.TC0_COUNT8.SYNCBUSY.HasBits(0x40) { | |
| } | |
| } |
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TC0 + EVSYS + CCL を用いて LCD_BACKLIGHT の明るさ制御 (ON / OFF の Duty 制御) を行う例。
元のソースは以下。
https://github.com/ciniml/WioTerminal_BackLight