--- /dev/null
+Name = STLcdCapabilities;
+Version = 0.1;
+Author = "HaaTa (Jacob Alexander) 2015";
+KLL = 0.3c;
+
+# Modified Date
+Date = 2015-08-01;
+
+# Defines available to the STLcd sub-module
+
+# PWM Prescalar
+# In general this can be left alone
+# A higher prescalar should be lower power usage (less switching)
+# However, flickering may be noticeable.
+#
+# Here's a calculation table valid at a 72 MHz system clock
+# Prescalars range from 0 to 7 (1 to 128)
+# 0 - 72 MHz - Highest power usage/best result
+# 1 - 36 MHz
+# 2 - 18 MHz
+# 3 - 9 MHz - Slightly visible flicker (peripheral vision)
+# 4 - 4 500 kHz - Visible flickering
+# 5 - 2 250 kHz
+# 6 - 1 125 kHz
+# 7 - 562 500 Hz
+# Defaulting to no prescalar, looks the best
+STLcdBacklightPrescalar => STLcdBacklightPrescalar_define;
+STLcdBacklightPrescalar = 0;
+
+# Default Backlight Channel Brightness
+# There are 3 channels, RGB
+# In order to get other colors you must mix the 3 colors
+# Each channel is a 16-bit register (65536 levels)
+# Technically, this means, the backlight is a 48-bit RGB pixel
+# In practice, it may be difficult to get color consistency at times if too bright or too dim
+STLcdBacklightRed => STLcdBacklightRed_define;
+STLcdBacklightGreen => STLcdBacklightGreen_define;
+STLcdBacklightBlue => STLcdBacklightBlue_define;
+
+# Defaults to 6% brightness, white
+STLcdBacklightRed = 0xFFF;
+STLcdBacklightGreen = 0xFFF;
+STLcdBacklightBlue = 0xFFF;
+
// Project Includes
#include <cli.h>
+#include <kll.h>
#include <led.h>
#include <print.h>
// Setup Backlight
// TODO Expose default settings
- // TODO Setup PWM
- GPIOC_PDDR |= (1<<1);
- PORTC_PCR1 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1);
- GPIOC_PCOR |= (1<<1);
- GPIOC_PDDR |= (1<<2);
- PORTC_PCR2 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1);
- GPIOC_PCOR |= (1<<2);
- GPIOC_PDDR |= (1<<3);
- PORTC_PCR3 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1);
- GPIOC_PCOR |= (1<<3);
+ SIM_SCGC6 |= SIM_SCGC6_FTM0;
+ FTM0_CNT = 0; // Reset counter
+
+ // PWM Period
+ // 16-bit maximum
+ FTM0_MOD = 0xFFFF;
+
+ // Set FTM to PWM output - Edge Aligned, Low-true pulses
+ FTM0_C0SC = 0x24; // MSnB:MSnA = 10, ELSnB:ELSnA = 01
+ FTM0_C1SC = 0x24;
+ FTM0_C2SC = 0x24;
+
+ // Base FTM clock selection (72 MHz system clock)
+ // Pre-scalar calculations
+ // 0 - 72 MHz - Highest power usage/best result
+ // 1 - 36 MHz
+ // 2 - 18 MHz
+ // 3 - 9 MHz - Slightly visible flicker (peripheral vision)
+ // 4 - 4 500 kHz - Visible flickering
+ // 5 - 2 250 kHz
+ // 6 - 1 125 kHz
+ // 7 - 562 500 Hz
+ // System clock, /w prescalar setting
+ FTM0_SC = FTM_SC_CLKS(1) | FTM_SC_PS( STLcdBacklightPrescalar_define );
+
+ /* Write frequency TODO API
+ FTM0_SC = 0;
+ FTM0_CNT = 0;
+ FTM0_MOD = mod;
+ FTM0_SC = FTM_SC_CLKS(1) | FTM_SC_PS(prescale);
+ */
+
+ // Red
+ FTM0_C0V = STLcdBacklightRed_define;
+ PORTC_PCR1 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(4);
+
+ // Green
+ FTM0_C1V = STLcdBacklightGreen_define;
+ PORTC_PCR2 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(4);
+
+ // Blue
+ FTM0_C2V = STLcdBacklightBlue_define;
+ PORTC_PCR3 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(4);
}