Diff: resources/rgb.cpp

Revision:

17:40ce3d963495

Child:

20:84ee332ba360

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/resources/rgb.cpp	Sat Apr 05 06:39:08 2014 +0000
@@ -0,0 +1,92 @@
+// Light resource implementation
+
+#include "mbed.h"
+#include "rgb.h"
+
+#define RGB_COLOUR_RES_ID    "308/0/0"
+#define RGB_SETPT_RES_ID    "308/0/5900"
+#define RGB_UNITS_RES_ID    "308/0/5701"
+
+extern Serial pc;
+static PwmOut rout(p23);
+static PwmOut gout(p24);
+static PwmOut bout(p25);
+static int rgb[] = {0, 0, 0};
+
+/*
+Convert the r|g|b string into the integer parts, each in the range [0,255]
+*/
+static void decode_rgb(char *rgbstr)
+{
+    char tmp[4];
+    memset(tmp, 0, sizeof(tmp));
+    char *next;
+    char *token = rgbstr;
+    int index = 0;
+    while((next = strchr(token, '|')) != NULL) {
+        int len = next - token;
+        strncpy(tmp, token, len);
+        rgb[index ++] = atoi(tmp);
+        token = next + 1;
+    }
+    rgb[index] = atoi(token);
+    pc.printf("decode_rgb(%s) = %d,%d,%d\r\n", rgbstr, rgb[0], rgb[1], rgb[2]);
+}
+
+static float RGB_SCALE = 1.0 / 255.0;
+/*
+The RGB LED is common anode, so that "0" is on, and "1" is off. For PWM, the closer to 0.0 the brighter, the closer to 1.0 the dimmer. 
+This method uses (1.0 - rgb value) to invert.
+*/
+static void setRGB()
+{
+    pc.printf("Changing to RGB(%d,%d,%d)\r\n", rgb[0], rgb[1], rgb[2]);
+    float r = rgb[0] * RGB_SCALE;
+    float g = rgb[1] * RGB_SCALE;
+    float b = rgb[2] * RGB_SCALE;
+    rout = 1 - r;
+    gout = 1 - g;
+    bout = 1 - b;
+}
+    
+/* Only GET and PUT method allowed */
+static uint8_t rgb_resource_cb(sn_coap_hdr_s *received_coap_ptr, sn_nsdl_addr_s *address, sn_proto_info_s * proto)
+{
+    sn_coap_hdr_s *coap_res_ptr = 0;
+    char rgbstr[16];
+
+    pc.printf("rgb callback\r\n");
+
+    if(received_coap_ptr->msg_code == COAP_MSG_CODE_REQUEST_GET)
+    {
+        coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CONTENT);
+  
+        sprintf(rgbstr, "%d|%d|%d", rgb[0], rgb[1], rgb[2]);
+
+        coap_res_ptr->payload_len = strlen(rgbstr);
+        coap_res_ptr->payload_ptr = (uint8_t*)rgbstr;
+        sn_nsdl_send_coap_message(address, coap_res_ptr);
+    }
+    else if(received_coap_ptr->msg_code == COAP_MSG_CODE_REQUEST_PUT)
+    {
+        memcpy(rgbstr, (char *)received_coap_ptr->payload_ptr, received_coap_ptr->payload_len);
+        rgbstr[received_coap_ptr->payload_len] = '\0';
+        decode_rgb(rgbstr);
+        setRGB();
+
+        coap_res_ptr = sn_coap_build_response(received_coap_ptr, COAP_MSG_CODE_RESPONSE_CHANGED);
+        sn_nsdl_send_coap_message(address, coap_res_ptr);
+    }
+
+    sn_coap_parser_release_allocated_coap_msg_mem(coap_res_ptr);
+    return 0;
+}
+
+int create_rgb_resource(sn_nsdl_resource_info_s *resource_ptr)
+{
+    nsdl_create_dynamic_resource(resource_ptr, sizeof(RGB_SETPT_RES_ID)-1, (uint8_t*)RGB_SETPT_RES_ID, 0, 0, 0, &rgb_resource_cb, (SN_GRS_GET_ALLOWED | SN_GRS_PUT_ALLOWED));
+    nsdl_create_static_resource(resource_ptr, sizeof(RGB_COLOUR_RES_ID)-1, (uint8_t*) RGB_COLOUR_RES_ID, 0, 0,  (uint8_t*) "RBG LED Colour", sizeof("RBG LED Colour")-1);
+    nsdl_create_static_resource(resource_ptr, sizeof(RGB_UNITS_RES_ID)-1, (uint8_t*) RGB_UNITS_RES_ID, 0, 0,  (uint8_t*) "(R|G|B)0-255", sizeof("(R|G|B)0-255")-1);
+    setRGB();
+    return 0;
+}
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