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-rw-r--r--quantum/backlight/backlight_arm.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/quantum/backlight/backlight_arm.c b/quantum/backlight/backlight_arm.c
new file mode 100644
index 0000000000..3f94ccef8e
--- /dev/null
+++ b/quantum/backlight/backlight_arm.c
@@ -0,0 +1,218 @@
+#include "quantum.h"
+#include "backlight.h"
+#include <hal.h>
+#include "debug.h"
+
+// TODO: remove short term bodge when refactoring BACKLIGHT_CUSTOM_DRIVER out
+#ifdef BACKLIGHT_PIN
+
+# if defined(STM32F0XX) || defined(STM32F0xx)
+# error "Backlight support for STMF072 is not available. Please disable."
+# endif
+
+# if defined(STM32F1XX) || defined(STM32F1xx)
+# define USE_GPIOV1
+# endif
+
+// GPIOV2 && GPIOV3
+# ifndef BACKLIGHT_PAL_MODE
+# define BACKLIGHT_PAL_MODE 2
+# endif
+
+// GENERIC
+# ifndef BACKLIGHT_PWM_DRIVER
+# define BACKLIGHT_PWM_DRIVER PWMD4
+# endif
+# ifndef BACKLIGHT_PWM_CHANNEL
+# define BACKLIGHT_PWM_CHANNEL 3
+# endif
+
+static void breathing_callback(PWMDriver *pwmp);
+
+static PWMConfig pwmCFG = {0xFFFF, /* PWM clock frequency */
+ 256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
+ NULL, /* No Callback */
+ { /* Default all channels to disabled - Channels will be configured durring init */
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_DISABLED, NULL}},
+ 0, /* HW dependent part.*/
+ 0};
+
+static PWMConfig pwmCFG_breathing = {0xFFFF, /** PWM clock frequency */
+ 256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
+ breathing_callback, /* Breathing Callback */
+ { /* Default all channels to disabled - Channels will be configured durring init */
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_DISABLED, NULL}},
+ 0, /* HW dependent part.*/
+ 0};
+
+// See http://jared.geek.nz/2013/feb/linear-led-pwm
+static uint16_t cie_lightness(uint16_t v) {
+ if (v <= 5243) // if below 8% of max
+ return v / 9; // same as dividing by 900%
+ else {
+ uint32_t y = (((uint32_t)v + 10486) << 8) / (10486 + 0xFFFFUL); // add 16% of max and compare
+ // to get a useful result with integer division, we shift left in the expression above
+ // and revert what we've done again after squaring.
+ y = y * y * y >> 8;
+ if (y > 0xFFFFUL) // prevent overflow
+ return 0xFFFFU;
+ else
+ return (uint16_t)y;
+ }
+}
+
+void backlight_init_ports(void) {
+ // printf("backlight_init_ports()\n");
+
+# ifdef USE_GPIOV1
+ palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_STM32_ALTERNATE_PUSHPULL);
+# else
+ palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_ALTERNATE(BACKLIGHT_PAL_MODE));
+# endif
+
+ pwmCFG.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_ACTIVE_HIGH;
+ pwmCFG_breathing.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_ACTIVE_HIGH;
+ pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
+
+ backlight_set(get_backlight_level());
+ if (is_backlight_breathing()) {
+ breathing_enable();
+ }
+}
+
+void backlight_set(uint8_t level) {
+ // printf("backlight_set(%d)\n", level);
+ if (level == 0) {
+ // Turn backlight off
+ pwmDisableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1);
+ } else {
+ // Turn backlight on
+ if (!is_breathing()) {
+ uint32_t duty = (uint32_t)(cie_lightness(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS));
+ // printf("duty: (%d)\n", duty);
+ pwmEnableChannel(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
+ }
+ }
+}
+
+uint8_t backlight_tick = 0;
+
+void backlight_task(void) {}
+
+# define BREATHING_NO_HALT 0
+# define BREATHING_HALT_OFF 1
+# define BREATHING_HALT_ON 2
+# define BREATHING_STEPS 128
+
+static uint8_t breathing_period = BREATHING_PERIOD;
+static uint8_t breathing_halt = BREATHING_NO_HALT;
+static uint16_t breathing_counter = 0;
+
+bool is_breathing(void) { return BACKLIGHT_PWM_DRIVER.config == &pwmCFG_breathing; }
+
+static inline void breathing_min(void) { breathing_counter = 0; }
+
+static inline void breathing_max(void) { breathing_counter = breathing_period * 256 / 2; }
+
+void breathing_interrupt_enable(void) {
+ pwmStop(&BACKLIGHT_PWM_DRIVER);
+ pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG_breathing);
+ chSysLockFromISR();
+ pwmEnablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
+ pwmEnableChannelI(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, 0xFFFF));
+ chSysUnlockFromISR();
+}
+
+void breathing_interrupt_disable(void) {
+ pwmStop(&BACKLIGHT_PWM_DRIVER);
+ pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
+}
+
+void breathing_enable(void) {
+ breathing_counter = 0;
+ breathing_halt = BREATHING_NO_HALT;
+ breathing_interrupt_enable();
+}
+
+void breathing_pulse(void) {
+ if (get_backlight_level() == 0)
+ breathing_min();
+ else
+ breathing_max();
+ breathing_halt = BREATHING_HALT_ON;
+ breathing_interrupt_enable();
+}
+
+void breathing_disable(void) {
+ // printf("breathing_disable()\n");
+ breathing_interrupt_disable();
+ // Restore backlight level
+ backlight_set(get_backlight_level());
+}
+
+void breathing_self_disable(void) {
+ if (get_backlight_level() == 0)
+ breathing_halt = BREATHING_HALT_OFF;
+ else
+ breathing_halt = BREATHING_HALT_ON;
+}
+
+void breathing_toggle(void) {
+ if (is_breathing())
+ breathing_disable();
+ else
+ breathing_enable();
+}
+
+void breathing_period_set(uint8_t value) {
+ if (!value) value = 1;
+ breathing_period = value;
+}
+
+void breathing_period_default(void) { breathing_period_set(BREATHING_PERIOD); }
+
+void breathing_period_inc(void) { breathing_period_set(breathing_period + 1); }
+
+void breathing_period_dec(void) { breathing_period_set(breathing_period - 1); }
+
+/* To generate breathing curve in python:
+ * from math import sin, pi; [int(sin(x/128.0*pi)**4*255) for x in range(128)]
+ */
+static const uint8_t breathing_table[BREATHING_STEPS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+// Use this before the cie_lightness function.
+static inline uint16_t scale_backlight(uint16_t v) { return v / BACKLIGHT_LEVELS * get_backlight_level(); }
+
+static void breathing_callback(PWMDriver *pwmp) {
+ (void)pwmp;
+ uint16_t interval = (uint16_t)breathing_period * 256 / BREATHING_STEPS;
+ // resetting after one period to prevent ugly reset at overflow.
+ breathing_counter = (breathing_counter + 1) % (breathing_period * 256);
+ uint8_t index = breathing_counter / interval % BREATHING_STEPS;
+
+ if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) || ((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1))) {
+ breathing_interrupt_disable();
+ }
+
+ uint32_t duty = cie_lightness(scale_backlight(breathing_table[index] * 256));
+
+ chSysLockFromISR();
+ pwmEnableChannelI(&BACKLIGHT_PWM_DRIVER, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
+ chSysUnlockFromISR();
+}
+
+#else
+
+__attribute__((weak)) void backlight_init_ports(void) {}
+
+__attribute__((weak)) void backlight_set(uint8_t level) {}
+
+__attribute__((weak)) void backlight_task(void) {}
+
+#endif