RAMA M6-B and IS31FL3218 driver (#4021)

* Initial RAMA M6-B commit.

* Moved IS31FL3218 driver, minor cleanups

* Refactor, added dynamic keymap.

* Added dynamic keymaps to RAMA M6-A

* Refactor M6-A and M6-B to use common code.

* Formatting

* Cleanup

* Cleanup

* Changes from review

1 files changed, 139 insertions, 0 deletions

diff --git a/keyboards/rama/m6_b/rgb_backlight.c b/keyboards/rama/m6_b/rgb_backlight.c
new file mode 100644
index 000000000..8f7ac0630
--- /dev/null
+++ b/keyboards/rama/m6_b/rgb_backlight.c
@@ -0,0 +1,139 @@
+/* Copyright 2018 Jason Williams (Wilba)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#if RGB_BACKLIGHT_ENABLED
+
+#include "rgb_backlight.h"
+//#include "rgb_backlight_api.h"
+
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include "progmem.h"
+
+#include "quantum/color.h"
+#include "drivers/avr/i2c_master.h"
+#include "drivers/issi/is31fl3218.h"
+
+bool g_suspend_state = false;
+
+// Global tick at 20 Hz
+uint32_t g_tick = 0;
+uint8_t g_config_effect_speed = 0;
+uint8_t g_config_brightness = 255;
+
+void backlight_update_pwm_buffers(void)
+{
+	IS31FL3218_update_pwm_buffers();
+}
+
+void backlight_set_color( int index, uint8_t red, uint8_t green, uint8_t blue )
+{
+	IS31FL3218_set_color( index, red, green, blue );
+}
+
+void backlight_set_color_all( uint8_t red, uint8_t green, uint8_t blue )
+{
+	IS31FL3218_set_color_all( red, green, blue );
+}
+
+
+// This is (F_CPU/1024) / 20 Hz
+// = 15625 Hz / 20 Hz
+// = 781
+#define TIMER3_TOP 260
+
+void backlight_timer_init(void)
+{
+	static uint8_t backlight_timer_is_init = 0;
+	if ( backlight_timer_is_init )
+	{
+		return;
+	}
+	backlight_timer_is_init = 1;
+
+	// Timer 3 setup
+	TCCR3B = _BV(WGM32) | 			// CTC mode OCR3A as TOP
+			 _BV(CS32) | _BV(CS30); // prescale by /1024
+	// Set TOP value
+	uint8_t sreg = SREG;
+	cli();
+
+	OCR3AH = (TIMER3_TOP >> 8) & 0xff;
+	OCR3AL = TIMER3_TOP & 0xff;
+	SREG = sreg;
+}
+
+void backlight_timer_enable(void)
+{
+	TIMSK3 |= _BV(OCIE3A);
+}
+
+void backlight_timer_disable(void)
+{
+	TIMSK3 &= ~_BV(OCIE3A);
+}
+
+void backlight_set_suspend_state(bool state)
+{
+	g_suspend_state = state;
+}
+
+void backlight_effect_cycle_all(void)
+{
+	uint8_t hueOffset = ( g_tick << g_config_effect_speed ) & 0xFF;
+	uint8_t satOffset = 127;
+	// Relies on hue being 8-bit and wrapping
+	for ( int i=0; i<6; i++ )
+	{
+		HSV hsv = { .h = hueOffset, .s = satOffset, .v = g_config_brightness };
+		RGB rgb = hsv_to_rgb( hsv );
+		backlight_set_color( i, rgb.r, rgb.g, rgb.b );
+	}
+}
+
+ISR(TIMER3_COMPA_vect)
+{
+	// delay 1 second before driving LEDs or doing anything else
+	static uint8_t startup_tick = 0;
+	if ( startup_tick < 20 )
+	{
+		startup_tick++;
+		return;
+	}
+
+	g_tick++;
+
+	if ( g_suspend_state )
+	{
+		backlight_set_color_all( 0, 0, 0 );
+	}
+	else
+	{
+		//HSV hsv = { .h = 240, .s = 255, .v = g_config_brightness };
+		//RGB rgb = hsv_to_rgb( hsv );
+		//backlight_set_color_all( rgb.r, rgb.g, rgb.b );
+		backlight_effect_cycle_all();
+	}
+}
+
+void backlight_init_drivers(void)
+{
+	// Initialize I2C
+	i2c_init();
+	IS31FL3218_init();
+}
+
+#endif // RGB_BACKLIGHT_ENABLED