ble: card10 svc - add lcd brightness

Documentation/bluetooth/card10.rst

@@ -80,6 +80,11 @@ The current draft uses following service specification:
   UUID: ``42230220-2342-2342-2342-234223422342``
   write no reponse
 
+- LCD brightness characteristic:
+
+  UUID: ``42230221-2342-2342-2342-234223422342``
+  write no reponse
+
 - Light sensor characteristic:
 
   UUID: ``422302f0-2342-2342-2342-234223422342``
@@ -175,6 +180,14 @@ By defining 11x rgb from left to right. You need also to set exchange a bigger M
 
 - set a rainbow beginnig with red on the right edge: ``0xff0000ff8b00e8ff005dff0000ff2e00ffb900b9ff002eff5d00ffe800ffff008b``
 
+LCD brightness characteristic
+---------------------------------
+This charatieristic set the brightness of the lcd backlight 0-100 in ``uint16``.
+It works only, if no application (pycardium app) blocks the screen.
+
+- set to 100 % ``0x6400``
+- set to 20 % ``0x1400`` (default value)
+
 Light sensor characteristic
 ---------------------------------
 

epicardium/ble/card10.c

@@ -65,6 +65,9 @@ enum {
 	/*!< \brief leds above characteristic */
 	CARD10_LEDS_ABOVE_CH_HDL,
 	CARD10_LEDS_ABOVE_VAL_HDL,
+	/*!< \brief lcd birhtness characteristic */
+	CARD10_LCD_BRIGHTNESS_CH_HDL,
+	CARD10_LCD_BRIGHTNESS_VAL_HDL,
 	/*!< \brief light sensor characteristic */
 	CARD10_LIGHT_SENSOR_CH_HDL,
 	CARD10_LIGHT_SENSOR_VAL_HDL,
@@ -235,6 +238,17 @@ static const uint8_t UUID_char_leds_above[] = {
 static const uint8_t UUID_attChar_leds_above[] = {
 	CARD10_UUID_SUFFIX, 0x20, CARD10_UUID_PREFIX
 };
+
+/* BLE UUID for card10 set lcd brightness */
+static const uint8_t UUID_char_lcd_brightness[] = {
+	ATT_PROP_WRITE_NO_RSP,
+	UINT16_TO_BYTES(CARD10_LCD_BRIGHTNESS_VAL_HDL),
+	CARD10_UUID_SUFFIX, 0x21, CARD10_UUID_PREFIX
+};
+
+static const uint8_t UUID_attChar_lcd_brightness[] = {
+	CARD10_UUID_SUFFIX, 0x21, CARD10_UUID_PREFIX
+};
 // starting at 0xf0 with read only characteristics
 
 /* BLE UUID for card10 char light sensor */
@@ -463,6 +477,21 @@ static const attsAttr_t card10SvcAttrList[] = {
 		  (ATTS_PERMIT_WRITE | ATTS_PERMIT_WRITE_ENC |
 		   ATTS_PERMIT_WRITE_AUTH) },
 
+	// LCD Brightness
+
+	{ .pUuid       = attChUuid,
+	  .pValue      = (uint8_t *)UUID_char_lcd_brightness,
+	  .pLen        = (uint16_t *)&UUID_char_len,
+	  .maxLen      = sizeof(UUID_char_lcd_brightness),
+	  .permissions = ATTS_PERMIT_READ },
+	{ .pUuid    = UUID_attChar_lcd_brightness,
+	  .pValue   = NULL,
+	  .maxLen   = sizeof(uint16_t),
+	  .settings = ATTS_SET_WRITE_CBACK,
+	  .permissions =
+		  (ATTS_PERMIT_WRITE | ATTS_PERMIT_WRITE_ENC |
+		   ATTS_PERMIT_WRITE_AUTH) },
+
 	// Light sensor
 
 	{ .pUuid       = attChUuid,
@@ -515,6 +544,7 @@ static uint8_t writeCard10CB(
 ) {
 	uint16_t ui16 = 0;
 	uint8_t ui8   = 0;
+	int intVar    = 0;
 
 	switch (handle) {
 	// time
@@ -704,6 +734,28 @@ static uint8_t writeCard10CB(
 				pValue[ui16 * 3 + 2]
 			);
 		}
+		return ATT_SUCCESS;
+	case CARD10_LCD_BRIGHTNESS_VAL_HDL:
+		intVar = epic_disp_open();
+		if (intVar < 0) {
+			APP_TRACE_INFO1(
+				"ble-card10: lock display to set brightness failed: %d",
+				intVar
+			);
+			return ATT_ERR_RANGE;
+		}
+		BYTES_TO_UINT16(ui16, pValue);
+		;
+		intVar = epic_disp_backlight(ui16);
+		APP_TRACE_INFO2(
+			"ble-card10: set lcd brightness to %ld - %d\n",
+			ui16,
+			intVar
+		);
+		if (intVar < 0)
+			return ATT_ERR_RANGE;
+		epic_disp_close();
+		return ATT_SUCCESS;
 	default:
 		APP_TRACE_INFO1(
 			"ble-card10: unsupported characteristic: %c\n", handle