Add original Pico support

aw410k.c

@@ -30,6 +30,8 @@ static void send_color(uint8_t dev_addr);
 static void send_initial(uint8_t dev_addr);
 static struct key * find_key(char * name);
 static void set_color(char * name, uint8_t red, uint8_t green, uint8_t blue, uint8_t mode);
+static uint8_t hexint (const char c);
+static uint8_t hexbyte (const char * s);
 
 static struct key key_list[NUM_KEYS] =
 {
@@ -326,7 +328,9 @@ void parse_colors(char * data, uint16_t len) {
 	if (token != NULL) {
 		// first string is the RGB color code
 		uint8_t red, green, blue;
-		sscanf(token, "%2x%2x%2x", &red, &green, &blue);
+		red = hexbyte(token);
+		green = hexbyte(token+2);
+		blue = hexbyte(token+4);
 
 		token = strtok(NULL, ",");
 		if (token != NULL) {
@@ -432,3 +436,21 @@ bool load_rgb_config(void) {
 	tud_cdc_write_str("Configuration failed to load\n");
 	return false;
 }
+
+// simple helper to convert hex char to uint8_t value
+static uint8_t hexint (const char c) {
+	if (c >= '0' && c <= '9') {
+		return c - '0';
+	} else if ( c >= 'a' && c <= 'f') {
+		return c - 'a' + 10;
+	} else if (c >= 'A' && c <= 'F') {
+		return c- 'A' + 10;
+	} else {
+		return 0;
+	}
+}
+
+// simple helper to convert 2 hex characters into a byte (uint8_t)
+static uint8_t hexbyte (const char * s) {
+	return (hexint(s[0]) << 4) | (hexint(s[1]));
+}