example: freertos: bug fix in esp8266_wifi example

Signed-off-by: Watson Zeng <zhiwei@synopsys.com>

Author: IRISZZW

example/freertos/esp8266_wifi/esp8266.c

@@ -103,9 +103,11 @@ int32_t esp8266_wifi_mode_set(ESP8266_DEF_PTR obj, ESP8266_WIFI_MODE mode, bool
 }
 
 /* rcv_buf should be large enough for scan result */
-int32_t esp8266_wifi_scan(ESP8266_DEF_PTR obj, char *rcv_buf)
+int32_t esp8266_wifi_scan(ESP8266_DEF_PTR obj, char *rcv_buf, char *ssid)
 {
-	at_send_cmd(obj->p_at, AT_EXECUTE, "CWLAP");
+	char cmd_str[64]= {0};
+	sprintf(cmd_str, "CWLAP=%s", ssid);
+	at_send_cmd(obj->p_at, AT_EXECUTE, cmd_str);
 	return at_get_reply(obj->p_at, rcv_buf, AT_LONG_TIMEOUT);
 }
 
@@ -167,7 +169,7 @@ int32_t esp8266_wifi_disconnect(ESP8266_DEF_PTR obj)
 
 int32_t esp8266_address_get(ESP8266_DEF_PTR obj)
 {
-	char rcv_buf[64];
+	char rcv_buf[128];
 	AT_PARSER_DEF_PTR p_at = obj->p_at;
 	at_send_cmd(p_at, AT_EXECUTE, "CIFSR");
 	return at_get_reply(p_at, rcv_buf, AT_NORMAL_TIMEOUT);

example/freertos/esp8266_wifi/esp8266.h

@@ -72,13 +72,13 @@ int32_t esp8266_test(ESP8266_DEF_PTR obj);
 
 int32_t esp8266_wifi_mode_get(ESP8266_DEF_PTR obj, bool flash);
 int32_t esp8266_wifi_mode_set(ESP8266_DEF_PTR obj, ESP8266_WIFI_MODE, bool flash);
-int32_t esp8266_wifi_scan(ESP8266_DEF_PTR obj, char * rcv_buf);
+int32_t esp8266_wifi_scan(ESP8266_DEF_PTR obj, char *rcv_buf, char *ssid);
 int32_t esp8266_wifi_connect(ESP8266_DEF_PTR obj, AT_STRING ssid, AT_STRING pwd, bool flash);
 int32_t esp8266_wifi_disconnect(ESP8266_DEF_PTR obj);
 int32_t esp8266_address_get(ESP8266_DEF_PTR obj);
 int32_t esp8266_conn_status(ESP8266_DEF_PTR obj);
 
-int32_t esp8266_dns_lookup(ESP8266_DEF_PTR obj, char * domain_ip, AT_STRING domain_name);
+int32_t esp8266_dns_lookup(ESP8266_DEF_PTR obj, char *domain_ip, AT_STRING domain_name);
 int32_t esp8266_tcp_connect(ESP8266_DEF_PTR obj, AT_STRING server_IP, uint32_t port);
 int32_t esp8266_tcp_server_open(ESP8266_DEF_PTR obj, uint32_t port);
 int32_t esp8266_tcp_server_close(ESP8266_DEF_PTR obj, uint32_t port);
@@ -88,10 +88,10 @@ int32_t esp8266_passthr_start(ESP8266_DEF_PTR obj);
 int32_t esp8266_passthr_end(ESP8266_DEF_PTR obj);
 int32_t esp8266_passthr_write(ESP8266_DEF_PTR obj, char *buf, uint32_t cnt);
 uint32_t esp8266_normal_write(ESP8266_DEF_PTR obj, char *buf, uint32_t cnt);
-uint32_t esp8266_connect_write(ESP8266_DEF_PTR obj, char *buf, char* connect, uint32_t cnt);
+uint32_t esp8266_connect_write(ESP8266_DEF_PTR obj, char *buf, char *connect, uint32_t cnt);
 int32_t esp8266_read(ESP8266_DEF_PTR obj, char *buf, uint32_t timeout);
 uint32_t esp8266_nread(ESP8266_DEF_PTR obj, char *buf, uint32_t n);
 
-int32_t esp8266_CIPCLOSE(ESP8266_DEF_PTR obj, char * conn_buf);
+int32_t esp8266_CIPCLOSE(ESP8266_DEF_PTR obj, char *conn_buf);
 
 #endif

example/freertos/esp8266_wifi/main.c

@@ -48,7 +48,7 @@ static char http_html_body_2[] =
     "<p>This Website is used to test the AT command about HttpServer of ESP8266.</p></body></html>";
 
 
-static char http_server_buf[1024];
+static char http_server_buf[2048];
 
 int main(void)
 {
@@ -74,7 +74,7 @@ int main(void)
 	EMBARC_PRINTF("============================ Connect WiFi ============================\n");
 
 	do {
-		esp8266_wifi_scan(esp8266, http_server_buf);
+		esp8266_wifi_scan(esp8266, http_server_buf, WIFI_SSID);
 		EMBARC_PRINTF("Searching for WIFI %s ......\n", WIFI_SSID);
 		board_delay_ms(100, 1);
 	} while (strstr(http_server_buf, WIFI_SSID)==NULL);