Refactor ARM backlight (#7959)

1 files changed, 61 insertions, 99 deletions

diff --git a/quantum/backlight/backlight_chibios.c b/quantum/backlight/backlight_chibios.c
index 723544adb..0fe812bf2 100644
--- a/quantum/backlight/backlight_chibios.c
+++ b/quantum/backlight/backlight_chibios.c
@@ -3,27 +3,37 @@
 #include <hal.h>
 #include "debug.h"
 
-// TODO: remove short term bodge when refactoring BACKLIGHT_CUSTOM_DRIVER out
-#ifdef BACKLIGHT_PIN
-
 // GPIOV2 && GPIOV3
-#    ifndef BACKLIGHT_PAL_MODE
-#        define BACKLIGHT_PAL_MODE 2
-#    endif
+#ifndef BACKLIGHT_PAL_MODE
+#    define BACKLIGHT_PAL_MODE 2
+#endif
 
 // GENERIC
-#    ifndef BACKLIGHT_PWM_DRIVER
-#        define BACKLIGHT_PWM_DRIVER PWMD4
+#ifndef BACKLIGHT_PWM_DRIVER
+#    define BACKLIGHT_PWM_DRIVER PWMD4
+#endif
+#ifndef BACKLIGHT_PWM_CHANNEL
+#    define BACKLIGHT_PWM_CHANNEL 3
+#endif
+
+// Support for pins which are on TIM1_CH1N - requires STM32_PWM_USE_ADVANCED
+#ifdef BACKLIGHT_PWM_COMPLEMENTARY_OUTPUT
+#    if BACKLIGHT_ON_STATE == 1
+#        define PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_LOW;
+#    else
+#        define PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH;
 #    endif
-#    ifndef BACKLIGHT_PWM_CHANNEL
-#        define BACKLIGHT_PWM_CHANNEL 3
+#else
+#    if BACKLIGHT_ON_STATE == 1
+#        define PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH;
+#    else
+#        define PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_LOW;
 #    endif
-
-static void breathing_callback(PWMDriver *pwmp);
+#endif
 
 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 */
+                           NULL,   /* Breathing Callback */
                            {       /* Default all channels to disabled - Channels will be configured durring init */
                             {PWM_OUTPUT_DISABLED, NULL},
                             {PWM_OUTPUT_DISABLED, NULL},
@@ -32,17 +42,6 @@ static PWMConfig pwmCFG = {0xFFFF, /* PWM clock frequency  */
                            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
@@ -60,125 +59,88 @@ static uint16_t cie_lightness(uint16_t v) {
 }
 
 void backlight_init_ports(void) {
-    // printf("backlight_init_ports()\n");
-
-#    ifdef USE_GPIOV1
+#ifdef USE_GPIOV1
     palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_STM32_ALTERNATE_PUSHPULL);
-#    else
+#else
     palSetPadMode(PAL_PORT(BACKLIGHT_PIN), PAL_PAD(BACKLIGHT_PIN), PAL_MODE_ALTERNATE(BACKLIGHT_PAL_MODE));
-#    endif
+#endif
 
-    pwmCFG.channels[BACKLIGHT_PWM_CHANNEL - 1].mode           = PWM_OUTPUT_ACTIVE_HIGH;
-    pwmCFG_breathing.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_ACTIVE_HIGH;
+    pwmCFG.channels[BACKLIGHT_PWM_CHANNEL - 1].mode = PWM_OUTPUT_MODE;
     pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
 
     backlight_set(get_backlight_level());
+
+#ifdef BACKLIGHT_BREATHING
     if (is_backlight_breathing()) {
         breathing_enable();
     }
+#endif
 }
 
 void backlight_set(uint8_t level) {
-    // printf("backlight_set(%d)\n", level);
+    if (level > BACKLIGHT_LEVELS) level = BACKLIGHT_LEVELS;
+
     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));
-        }
+        uint32_t duty = (uint32_t)(cie_lightness(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS));
+        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
+#ifdef BACKLIGHT_BREATHING
 
-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; }
+#    define BREATHING_STEPS 128
 
-static inline void breathing_max(void) { breathing_counter = get_breathing_period() * 256 / 2; }
+/* 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};
 
-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_callback(PWMDriver *pwmp);
 
-void breathing_interrupt_disable(void) {
-    pwmStop(&BACKLIGHT_PWM_DRIVER);
-    pwmStart(&BACKLIGHT_PWM_DRIVER, &pwmCFG);
-}
+bool is_breathing(void) { return pwmCFG.callback != NULL; }
 
 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();
+    pwmCFG.callback = breathing_callback;
+    pwmEnablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
 }
 
 void breathing_disable(void) {
-    // printf("breathing_disable()\n");
-    breathing_interrupt_disable();
+    pwmCFG.callback = NULL;
+    pwmDisablePeriodicNotification(&BACKLIGHT_PWM_DRIVER);
+
     // 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;
-}
-
-/* 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;
+void breathing_callback(PWMDriver *pwmp) {
     uint8_t  breathing_period = get_breathing_period();
     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));
+    // resetting after one period to prevent ugly reset at overflow.
+    static uint16_t breathing_counter = 0;
+    breathing_counter                 = (breathing_counter + 1) % (breathing_period * 256);
+    uint8_t  index                    = breathing_counter / interval % BREATHING_STEPS;
+    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));
+    pwmEnableChannelI(pwmp, BACKLIGHT_PWM_CHANNEL - 1, PWM_FRACTION_TO_WIDTH(&BACKLIGHT_PWM_DRIVER, 0xFFFF, duty));
     chSysUnlockFromISR();
 }
 
+// TODO: integrate generic pulse solution
+void breathing_pulse(void) {
+    backlight_set(is_backlight_enabled() ? 0 : BACKLIGHT_LEVELS);
+    wait_ms(10);
+    backlight_set(is_backlight_enabled() ? get_backlight_level() : 0);
+}
+
 #endif