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https://github.com/UpsilonNumworks/Upsilon.git
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86 lines
1.6 KiB
C++
86 lines
1.6 KiB
C++
#include <ion.h>
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#include "regs/regs.h"
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#include "backlight.h"
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/* This driver controls the RT9365 LED driver.
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* This chip allows the brightness to be set to 16 different values. It starts
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* at full brightness on power on. Applying a pulse on the EN pin will select
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* the next value in decreasing order. Once it reaches the minimal value, the
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* next pulse will loop back to full brightness. */
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// Public Ion::Backlight methods
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namespace Ion {
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namespace Backlight {
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void setBrightness(uint8_t b) {
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Device::setLevel(b >> 4);
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}
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uint8_t brightness() {
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return Device::level() << 4;
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}
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}
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}
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// Private Ion::Backlight::Device methods
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namespace Ion {
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namespace Backlight {
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namespace Device {
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static uint8_t sLevel;
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void init() {
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GPIOC.MODER()->setMode(6, GPIO::MODER::Mode::Output);
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sLevel = 0xF;
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resume();
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}
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void shutdown() {
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GPIOC.MODER()->setMode(6, GPIO::MODER::Mode::Analog);
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GPIOC.PUPDR()->setPull(6, GPIO::PUPDR::Pull::None);
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}
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void suspend() {
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GPIOC.ODR()->set(6, false);
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mssleep(3); // Might not need to be blocking
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}
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void resume() {
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GPIOC.ODR()->set(6, true);
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ussleep(50);
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uint8_t level = sLevel;
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sLevel = 0xF;
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setLevel(level);
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}
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void setLevel(uint8_t level) {
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// From sLevel = 12 to level 7 : 5 pulses
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// From sLevel = 5 to level 9 : 12 pulses (5 to go to level 16, and 7 to 9)
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if (sLevel < level) {
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sendPulses(16 + sLevel - level);
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} else {
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sendPulses(sLevel - level);
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}
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sLevel = level;
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}
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uint8_t level() {
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return sLevel;
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}
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void sendPulses(int n) {
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for (int i=0; i<n; i++) {
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GPIOC.ODR()->set(6, false);
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ussleep(20);
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GPIOC.ODR()->set(6, true);
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ussleep(20);
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}
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}
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}
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}
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}
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