ttwrplus: add RGB LED support

Implemented WS2812C support with Zephyr driver.
Hooked up the RGB control to the existing RED and GREEN LED support.

TG-553

platform/drivers/keyboard/keyboard_ttwrplus.c

@@ -55,7 +55,7 @@ static void gpio_keys_cb_handler(struct input_event *evt)
         keys &= ~keyCode;
 }
 
-INPUT_LISTENER_CB_DEFINE(buttons_dev, gpio_keys_cb_handler);
+INPUT_CALLBACK_DEFINE(buttons_dev, gpio_keys_cb_handler);
 
 
 void kbd_init()

platform/targets/ttwrplus/platform.c

@@ -24,13 +24,14 @@
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/drivers/sensor.h>
 #include <zephyr/drivers/uart.h>
+#include <zephyr/drivers/led_strip.h>
 #include "pmu.h"
 
 #define BUTTON_PTT_NODE DT_NODELABEL(button_ptt)
 
 static const struct gpio_dt_spec button_ptt = GPIO_DT_SPEC_GET_OR(BUTTON_PTT_NODE, gpios, {0});
 static const struct device *const qdec_dev = DEVICE_DT_GET(DT_ALIAS(qdec0));
-
+static const struct device *const led_dev  = DEVICE_DT_GET(DT_ALIAS(led0));
 
 static const hwInfo_t hwInfo =
 {
@@ -42,6 +43,10 @@ static const hwInfo_t hwInfo =
     .uhf_minFreq = 440,
 };
 
+// RGB led color data
+static struct led_rgb led_color = {0};
+
+
 void platform_init()
 {
     // Setup GPIO for PTT and rotary encoder
@@ -61,6 +66,14 @@ void platform_init()
 
     // Initialize PMU
     pmu_init();
+
+    // Initialize LED
+    if (device_is_ready(led_dev) == false)
+        printk("LED device %s is not ready", led_dev->name);
+
+    ret = led_strip_update_rgb(led_dev, &led_color, 1);
+    if (ret)
+        printk("couldn't update strip: %d", ret);
 }
 
 void platform_terminate()
@@ -116,12 +129,44 @@ bool platform_pwrButtonStatus()
 
 void platform_ledOn(led_t led)
 {
-    (void) led;
+    int ret = 0;
+
+    switch(led)
+    {
+        case GREEN:
+            led_color.g = 0xff;
+            break;
+        case RED:
+            led_color.r = 0xff;
+            break;
+        default:
+            break;
+    }
+
+    ret = led_strip_update_rgb(led_dev, &led_color, 1);
+    if (ret)
+        printk("couldn't update strip: %d", ret);
 }
 
 void platform_ledOff(led_t led)
 {
-    (void) led;
+    int ret = 0;
+
+    switch(led)
+    {
+        case GREEN:
+            led_color.g = 0x00;
+            break;
+        case RED:
+            led_color.r = 0x00;
+            break;
+        default:
+            break;
+    }
+
+    ret = led_strip_update_rgb(led_dev, &led_color, 1);
+    if (ret)
+        printk("couldn't update strip: %d", ret);
 }
 
 void platform_beepStart(uint16_t freq)

platform/targets/ttwrplus/ttwrplus.dts

@@ -22,6 +22,7 @@
         radio-pdn = &radio_pdn;
         radio-ptt = &radio_ptt;
         qdec0 = &pcnt;
+        led0 = &ws2812c;
     };
 
     chosen {
@@ -52,7 +53,7 @@
     };
 
     buttons: buttons {
-		compatible = "zephyr,gpio-keys";
+        compatible = "gpio-keys";
 
         button_boot: button_0 {
             gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
@@ -117,6 +118,32 @@
         };
 };
 
+&spi3 {
+    #address-cells = <1>;
+    #size-cells = <0>;
+    line-idle-low; /* Workaround to have low signal for latching */
+    status = "okay";
+    pinctrl-0 = <&spim3_default>;
+    pinctrl-names = "default";
+    ws2812c: ws2812@0 {
+            compatible = "worldsemi,ws2812-spi";
+
+            /* SPI */
+            reg = <0x0>; /* ignored, but necessary for SPI bindings */
+            spi-max-frequency = <6400000>;
+
+            /* WS2812C */
+            chain-length = <1>; /* arbitrary; change at will */
+            spi-cpha;
+            spi-one-frame = <0xf0>; /* 11110000: 625 ns high and 625 ns low */
+            spi-zero-frame = <0xc0>; /* 11000000: 312.5 ns high and 937.5 ns low */
+            color-mapping = <LED_COLOR_ID_GREEN
+                             LED_COLOR_ID_RED
+                             LED_COLOR_ID_BLUE>;
+            reset-delay = <280>; /* > 280us by WS2812C datasheet */
+    };
+};
+
 &pcnt {
   pinctrl-0 = <&pcnt_default>;
   pinctrl-names = "default";
@@ -184,6 +211,12 @@
         };
     };
 
+    spim3_default: spim3_default {
+        group2 {
+            pinmux = <SPIM3_MOSI_GPIO42>;
+        };
+    };
+
     pcnt_default: pcnt_default {
         group1 {
             pinmux = <PCNT0_CH0SIG_GPIO46>,

platform/targets/ttwrplus/ttwrplus_defconfig

@@ -12,7 +12,12 @@ CONFIG_COMMON_LIBC_MALLOC=y
 CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=131072
 CONFIG_NEWLIB_LIBC_MIN_REQUIRED_HEAP_SIZE=0
 CONFIG_INPUT=y
+CONFIG_INPUT_GPIO_KEYS=y
 CONFIG_SENSOR=y
 CONFIG_SERIAL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y
 CONFIG_ASSERT=y
+CONFIG_SPI=y
+CONFIG_LED_STRIP=y
+CONFIG_WS2812_STRIP=y
+CONFIG_WS2812_STRIP_SPI=y