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comparison Scan/STLcd/lcd_scan.c @ 351:38395a57cf52

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Adding 16-bit brightness control to LCD backlight
author Jacob Alexander <haata@kiibohd.com>
date Sat, 01 Aug 2015 21:59:43 -0700
parents 136e47478441
children 99b567a3b1f2
comparison
equal deleted inserted replaced
350:b02fc17eb027 351:38395a57cf52
19 // Compiler Includes 19 // Compiler Includes
20 #include <Lib/ScanLib.h> 20 #include <Lib/ScanLib.h>
21 21
22 // Project Includes 22 // Project Includes
23 #include <cli.h> 23 #include <cli.h>
24 #include <kll.h>
24 #include <led.h> 25 #include <led.h>
25 #include <print.h> 26 #include <print.h>
26 27
27 // Local Includes 28 // Local Includes
28 #include "lcd_scan.h" 29 #include "lcd_scan.h"
274 // Run LCD intialization sequence 275 // Run LCD intialization sequence
275 LCD_initialize(); 276 LCD_initialize();
276 277
277 // Setup Backlight 278 // Setup Backlight
278 // TODO Expose default settings 279 // TODO Expose default settings
279 // TODO Setup PWM 280 SIM_SCGC6 |= SIM_SCGC6_FTM0;
280 GPIOC_PDDR |= (1<<1); 281 FTM0_CNT = 0; // Reset counter
281 PORTC_PCR1 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1); 282
282 GPIOC_PCOR |= (1<<1); 283 // PWM Period
283 GPIOC_PDDR |= (1<<2); 284 // 16-bit maximum
284 PORTC_PCR2 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1); 285 FTM0_MOD = 0xFFFF;
285 GPIOC_PCOR |= (1<<2); 286
286 GPIOC_PDDR |= (1<<3); 287 // Set FTM to PWM output - Edge Aligned, Low-true pulses
287 PORTC_PCR3 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1); 288 FTM0_C0SC = 0x24; // MSnB:MSnA = 10, ELSnB:ELSnA = 01
288 GPIOC_PCOR |= (1<<3); 289 FTM0_C1SC = 0x24;
290 FTM0_C2SC = 0x24;
291
292 // Base FTM clock selection (72 MHz system clock)
293 // Pre-scalar calculations
294 // 0 - 72 MHz - Highest power usage/best result
295 // 1 - 36 MHz
296 // 2 - 18 MHz
297 // 3 - 9 MHz - Slightly visible flicker (peripheral vision)
298 // 4 - 4 500 kHz - Visible flickering
299 // 5 - 2 250 kHz
300 // 6 - 1 125 kHz
301 // 7 - 562 500 Hz
302 // System clock, /w prescalar setting
303 FTM0_SC = FTM_SC_CLKS(1) | FTM_SC_PS( STLcdBacklightPrescalar_define );
304
305 /* Write frequency TODO API
306 FTM0_SC = 0;
307 FTM0_CNT = 0;
308 FTM0_MOD = mod;
309 FTM0_SC = FTM_SC_CLKS(1) | FTM_SC_PS(prescale);
310 */
311
312 // Red
313 FTM0_C0V = STLcdBacklightRed_define;
314 PORTC_PCR1 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(4);
315
316 // Green
317 FTM0_C1V = STLcdBacklightGreen_define;
318 PORTC_PCR2 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(4);
319
320 // Blue
321 FTM0_C2V = STLcdBacklightBlue_define;
322 PORTC_PCR3 = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(4);
289 } 323 }
290 324
291 325
292 // LCD State processing loop 326 // LCD State processing loop
293 inline uint8_t LCD_scan() 327 inline uint8_t LCD_scan()