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``
   read and write no reponse
 
+- LCD brightness characteristic:
+
+  UUID: ``42230221-2342-2342-2342-234223422342``
+  write no reponse
+
 - Light sensor characteristic:
 
   UUID: ``422302f0-2342-2342-2342-234223422342``
@@ -178,6 +183,13 @@ 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``.
+
+- 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,
@@ -263,6 +266,17 @@ static uint8_t aboveLEDsValue[] = {
 };
 static uint16_t aboveLEDsLen = sizeof(aboveLEDsValue);
 
+/* 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 */
@@ -543,6 +557,24 @@ static const attsAttr_t card10SvcAttrList[] = {
 			       ATTS_PERMIT_READ_ENC | ATTS_PERMIT_READ_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
 
 	{
@@ -630,6 +662,7 @@ static uint8_t writeCard10CB(
 ) {
 	uint16_t ui16 = 0;
 	uint8_t ui8   = 0;
+	int intVar    = 0;
 
 	switch (handle) {
 	// time
@@ -788,6 +821,15 @@ static uint8_t writeCard10CB(
 		}
 		epic_leds_update();
 		return ATT_SUCCESS;
+	case CARD10_LCD_BRIGHTNESS_VAL_HDL:
+		BYTES_TO_UINT16(ui16, pValue);
+		intVar = epic_disp_backlight(ui16);
+		APP_TRACE_INFO2(
+			"ble-card10: set lcd brightness to %ld - %d\n",
+			ui16,
+			intVar
+		);
+		return ATT_SUCCESS;
 	default:
 		APP_TRACE_INFO1("ble-card10: unsupported handle: %x\n", handle);
 		return ATT_ERR_HANDLE;