Revision 2:d810dbdd716b, committed 2017-09-22

Comitter:

Rhyme

Date:

Fri Sep 22 05:12:59 2017 +0000

Parent:

1:a890937c9c30

Child:

3:43de31beea45

Commit message:

The backlight control of ILI9341 is not connected to the MCU, but gpio-2 of STMPE610 is, so I used STMPE610 to control ILI9341 backlight enable.

Changed in this revision

--- a/main.cpp	Fri Sep 22 01:39:14 2017 +0000
+++ b/main.cpp	Fri Sep 22 05:12:59 2017 +0000
@@ -52,6 +52,18 @@
 
 extern void doMaze(void) ;
 
+void backlight(int value)
+{
+    uint8_t data[2] ;
+    data[1] = 0x04 ; // GPIO-2 as target pin
+    if (value) { /* backlight on */
+        data[0] = 0x10 ; // GPIO_SET_PIN
+    } else {
+        data[0] = 0x11 ; // GPIO_CLR_PIN
+    }
+    tsc->writeRegs(data, 2) ;
+}
+        
 void init_hardware(void)
 {
     sakura = new MAX32630FTHR(MAX32630FTHR::VIO_3V3) ;
@@ -69,6 +81,14 @@
     tsc = new SPI_STMPE610(SPI2_MOSI, SPI2_MISO, SPI2_SCK, PIN_TSC_CS) ;
     tsc->spi_format(8, 0) ; 
     tsc->calibrate(3552, 400, 439, 3680) ;
+/* enable tsc's gpio-2 for backlight */
+    uint8_t data[2] ;
+    data[0] = 0x17 ; // GPIO_ALT_FUNC
+    data[1] = 0x04 ; // GPIO-2 to be GPIO
+    tsc->writeRegs(data, 2) ; 
+    data[0] = 0x13 ; // GPIO_DIR
+    data[1] = 0x04 ; // GPIO-2 as output
+    tsc->writeRegs(data, 2) ;
 
     ledR = new DigitalOut(PIN_LED_R) ;
     ledG = new DigitalOut(PIN_LED_G) ;
@@ -101,6 +121,7 @@
 {
     tft->BusEnable(true) ;
 //    backlight = 0 ;
+    backlight(0) ;
     tft->background(White) ;
     wait(0.1) ;
     tft->cls() ;
@@ -133,6 +154,7 @@
     tft->printf("until the next screen starts") ;
     tft->BusEnable(false) ;
 //    backlight = 1 ;
+    backlight(1) ;
 }
 
 
@@ -141,6 +163,7 @@
     //Draw some graphics
     int i, x[2], y[2] ;
 //    backlight = 0 ;
+    backlight(0) ;
     tft->BusEnable(true) ;
     tft->background(Black);
     wait(0.1) ;
@@ -190,6 +213,7 @@
     tft->printf("capability is provided") ;
     tft->BusEnable(false) ;
 //    backlight = 1 ;
+    backlight(1) ;
 }    
 
 float clip(float src)
@@ -223,6 +247,7 @@
     float gyr_range ;
  
 //    backlight = 1 ;
+    backlight(1) ;
     acc_range = (float)acc->getAccRange() ;
     gyr_range = (float)acc->getGyrRange() ;
     tft->BusEnable(true) ;
@@ -337,6 +362,7 @@
             break ;
         case 2:
             if (prevPage != page) {
+                backlight(0) ;
                 tft->BusEnable(true) ;
                 tft->background(Black) ;
                 tft->foreground(White) ;