Update README.md

README.md

@@ -80,8 +80,9 @@ bck=<gpio>,ws=<gpio>,do=<gpio>
 The NVS parameter "display_config" sets the parameters for an optional display. Syntax is
 ```
 I2C,width=<pixels>,height=<pixels>[address=<i2c_address>][,HFlip][,VFlip][driver=SSD1306|SSD1326[:1|4]|SSD1327|SH1106]
-SPI,width=<pixels>,height=<pixels>,cs=<gpio>[,speed=<speed>][,HFlip][,VFlip][driver=SSD1306|SSD1322|SSD1326[:1|4]|SSD1327|SH1106][SSD1675]
+SPI,width=<pixels>,height=<pixels>,cs=<gpio>[,back=<gpio>][,speed=<speed>][,HFlip][,VFlip][driver=SSD1306|SSD1322|SSD1326[:1|4]|SSD1327|SH1106|SSD1675|ST7735|ST7789]
 ```
+- back: a LED backlight used by some older devices (ST7735). It is PWM controlled for brightness
 - VFlip and HFlip are optional can be used to change display orientation
 - Default speed is 8000000 (8MHz) but SPI can work up to 26MHz or even 40MHz
 - SH1106 is 128x64 monochrome I2C/SPI [here]((https://www.waveshare.com/wiki/1.3inch_OLED_HAT))
@@ -91,6 +92,8 @@ SPI,width=<pixels>,height=<pixels>,cs=<gpio>[,speed=<speed>][,HFlip][,VFlip][dri
 - SSD1326 is 256x32 monochrome or grayscale 16-levels SPI [here](https://www.aliexpress.com/item/32833603664.html?spm=a2g0o.productlist.0.0.2d19776cyQvsBi&algo_pvid=c7a3db92-e019-4095-8a28-dfdf0a087f98&algo_expid=c7a3db92-e019-4095-8a28-dfdf0a087f98-1&btsid=0ab6f81e15955375483301352e4208&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_)
 - SSD1327 is 256x64 grayscale 16-levels SPI in multiple sizes [here](https://www.buydisplay.com/oled-display/oled-display-module?resolution=159) - it is very nice
 - SSD1675 is an e-ink paper and is experimental as e-ink is really not suitable for LMS du to its very low refresh rate
+- ST7735 is a 128x160 65k color SPI [here](https://www.waveshare.com/product/displays/lcd-oled/lcd-oled-3/1.8inch-lcd-module.htm). This needs a backlight control
+- ST7789 (coming)
 
 To use the display on LMS, add repository https://raw.githubusercontent.com/sle118/squeezelite-esp32/master/plugin/repo.xml. You will then be able to tweak how the vu-meter and spectrum analyzer are displayed, as well as size of artwork. You can also install the excellent plugin "Music Information Screen" which is super useful to tweak the layout.
 
@@ -132,6 +135,11 @@ Syntax is:
 <gpio>=Vcc|GND|amp|ir|jack[:0|1]|green[:0|1]|red[:0|1]|spkfault[:0|1][,<repeated sequence for next GPIO>]
 ```
 You can define the defaults for jack, spkfault leds at compile time but nvs parameter takes precedence except for SqueezeAMP where these are forced at runtime.
+### LED 
+See §**Set GPIO** for how to set the green and red LEDs. In addition, their brightness can be controlled using the "led_brigthness" parameter. The syntax is
+```
+[green=0..100][,red=0..100]
+```
 ### Rotary Encoder
 One rotary encoder is supported, quadrature shift with press. Such encoders usually have 2 pins for encoders (A and B), and common C that must be set to ground and an optional SW pin for press. A, B and SW must be pulled up, so automatic pull-up is provided by ESP32, but you can add your own resistors. A bit of filtering on A and B (~470nF) helps for debouncing which is not made by software.