added LCD backlight driver

see example in module/bsx.c

.gitignore

@@ -7,3 +7,4 @@ firmware.elf
 *.a
 *.swp
 lpc1xxx/memory.ld
+modules/wrapper.c

lcd/Makefile

@@ -11,6 +11,7 @@ OBJS += orbitron14.o
 OBJS += display.o
 OBJS += render.o
 OBJS += decoder.o
+OBJS += backlight.o
 
 ##########################################################################
 # GNU GCC compiler flags

lcd/backlight.c

@@ -0,0 +1,44 @@
+/*
+ * Based on microbuilders PWM example.
+ */
+#include "lpc134x.h"
+#include "sysdefs.h"
+
+uint32_t brightness = 100;
+
+void backlightInit(void) {
+  /* Enable the clock for CT16B1 */
+  SCB_SYSAHBCLKCTRL |= (SCB_SYSAHBCLKCTRL_CT16B1);
+
+  /* Configure PIO1.10 as Timer1_16 MAT1 Output */
+  IOCON_PIO1_10 &= ~IOCON_PIO1_10_FUNC_MASK;
+  IOCON_PIO1_10 |= IOCON_PIO1_10_FUNC_CT16B1_MAT1;
+
+  /* Set default duty cycle (MR1) */
+  TMR_TMR16B1MR1 = (0xFFFF * (100 - brightness)) / 100;
+
+  /* External Match Register Settings for PWM */
+  TMR_TMR16B1EMR = TMR_TMR16B1EMR_EMC1_TOGGLE | TMR_TMR16B1EMR_EM1;
+
+  /* enable Timer1 */
+  TMR_TMR16B1TCR = TMR_TMR16B1TCR_COUNTERENABLE_ENABLED;
+
+  /* Enable PWM1 */
+  TMR_TMR16B1PWMC = TMR_TMR16B1PWMC_PWM1_ENABLED;
+}
+
+int backlightSetBrightness(uint32_t percentage) {
+  if ((percentage < 1) || (percentage > 100)) {
+    /* brightness must be a value between 1 and 100 */
+    return -1;
+  }
+
+  /* Set Duty Cycle (MR1) */
+  TMR_TMR16B1MR1 = (0xFFFF * (100 - (brightness = percentage))) / 100;
+
+  return 0;
+}
+
+uint32_t backlightGetBrightness(void) {
+    return brightness;
+}

lcd/backlight.h

@@ -0,0 +1,8 @@
+#ifndef __BACKLIGHT_H_
+#define __BACKLIGHT_H_ 1
+
+void backlightInit(void);
+int backlightSetBrightness(uint32_t percentage);
+uint32_t backlightGetBrightness(void);
+
+#endif /* __BACKLIGHT_H_ */

modules/bsx.c

@@ -0,0 +1,74 @@
+#include <sysinit.h>
+
+#include "basic/basic.h"
+
+#include "lcd/render.h"
+#include "lcd/backlight.h"
+#include "lcd/smallfonts.h"
+
+void ReinvokeISP(void);
+
+/**************************************************************************/
+
+void module_bsx(void) {
+    int yctr = 18;
+    int dx = 0;
+    uint32_t brightness = 0;
+
+    font_direction = FONT_DIR_LTR; // LeftToRight is the default
+    font = &Font_7x8;
+
+    DoString(0, 0, "bsx");
+
+    backlightInit();
+    brightness = backlightGetBrightness();
+
+    while (1) {
+        uint32_t results;
+        lcdDisplay(0);
+        delayms(10);
+
+        if(gpioGetValue(RB_BTN1)==0){
+            brightness++;
+            if (brightness > 100) brightness = 100;
+            backlightSetBrightness(brightness);
+        };
+
+        if(gpioGetValue(RB_BTN0)==0){
+            brightness--;
+            if (brightness > 100) brightness = 0;
+            backlightSetBrightness(brightness);
+        };
+
+        if (gpioGetValue(RB_BTN4)==0) {
+            while(gpioGetValue(RB_BTN4)==0);
+            DoString(0,8,"Enter ISP!");
+            lcdDisplay(0);
+            ReinvokeISP();
+        };
+
+        dx = DoString(0, yctr, "Bright:");
+        dx = DoInt(dx, yctr, brightness);
+        DoString(dx, yctr, "%   ");
+
+        results = adcRead(1);
+        dx=DoString(0,yctr+20,"Voltage:");
+        results *= 10560;
+        results /= 1024;
+        DoInt(dx,yctr+20,results);
+
+        if (results < 3500) {
+            DoString(0,yctr+30,"Shutdown");
+            gpioSetValue (RB_PWR_GOOD, 0); 
+            gpioSetValue (RB_LCD_BL, 0); 
+            SCB_SCR |= SCB_SCR_SLEEPDEEP;
+            PMU_PMUCTRL = PMU_PMUCTRL_DPDEN_DEEPPOWERDOWN;
+            __asm volatile ("WFI");
+        } else {
+            DoString(0,yctr+30,"OK           ");
+        }
+
+    }
+
+    return;
+}