Configure and manage the connection to a WiFi access point (AP) or configure and manage the access point (AP). More...

Content
	WiFi Option Codes
	WiFi Option Codes for ARM_WIFI_SetOption or ARM_WIFI_GetOption function.

	WiFi Security Type
	Specifies WiFi security type for ARM_WIFI_Activate.

	WiFi Protected Setup (WPS) Method
	Specifies WiFi WPS method for ARM_WIFI_Activate.

	WiFi DHCPv6 Mode
	Specifies IPv6 Dynamic Host Configuration Protocol (DHCP) Mode.

Data Structures
struct	ARM_WIFI_CONFIG_t
	WiFi Configuration. More...

struct	ARM_WIFI_SCAN_INFO_t
	WiFi Scan Information. More...

struct	ARM_WIFI_NET_INFO_t
	WiFi Network Information. More...

Functions
int32_t	ARM_WIFI_SetOption (uint32_t interface, uint32_t option, const void *data, uint32_t len)
	Set WiFi Module Options. More...

int32_t	ARM_WIFI_GetOption (uint32_t interface, uint32_t option, void data, uint32_t len)
	Get WiFi Module Options. More...

int32_t	ARM_WIFI_Scan (ARM_WIFI_SCAN_INFO_t scan_info[], uint32_t max_num)
	Scan for available networks in range. More...

int32_t	ARM_WIFI_Activate (uint32_t interface, const ARM_WIFI_CONFIG_t *config)
	Activate interface (Connect to a wireless network or activate an access point). More...

int32_t	ARM_WIFI_Deactivate (uint32_t interface)
	Deactivate interface (Disconnect from a wireless network or deactivate an access point). More...

uint32_t	ARM_WIFI_IsConnected (void)
	Get station connection status. More...

int32_t	ARM_WIFI_GetNetInfo (ARM_WIFI_NET_INFO_t *net_info)
	Get station Network Information. More...

Description

Configure and manage the connection to a WiFi access point (AP) or configure and manage the access point (AP).

The WiFi Management functions are used to configure and manage the connection to a WiFi access point (AP) also called hotspot when in station mode. They are also used to configure and manage the access point (AP) itself when in access point mode.

Data Structure Documentation

struct ARM_WIFI_CONFIG_t

WiFi Configuration.

Provides information needed to connect to the WiFi network for station or how to configure the access point (AP).

Used in:

ARM_WIFI_Activate

Data Fields
const char *	ssid	Pointer to Service Set Identifier (SSID) null-terminated string.
const char *	pass	Pointer to Password null-terminated string.
uint8_t	security	Security type (ARM_WIFI_SECURITY_xxx)
uint8_t	ch	WiFi Channel (0 = auto, otherwise = exact channel)
uint8_t	reserved	Reserved.
uint8_t	wps_method	WiFi Protected Setup (WPS) method (ARM_WIFI_WPS_METHOD_xxx)
const char *	wps_pin	Pointer to WiFi Protected Setup (WPS) PIN null-terminated string.

struct ARM_WIFI_SCAN_INFO_t

WiFi Scan Information.

Provides information about the wireless networks that were detected when searching for available WiFi networks. The structure contains the information needed to connect to the WiFi network. Of course, the access password is not included and must be provided separately.

Used in:

ARM_WIFI_Scan

Data Fields
char	ssid[32+1]	Service Set Identifier (SSID) null-terminated string.
uint8_t	bssid[6]	Basic Service Set Identifier (BSSID)
uint8_t	security	Security type (ARM_WIFI_SECURITY_xxx)
uint8_t	ch	WiFi Channel.
uint8_t	rssi	Received Signal Strength Indicator.

struct ARM_WIFI_NET_INFO_t

WiFi Network Information.

Provides information about the network that the station is connected to.

Used in:

ARM_WIFI_GetNetInfo

Data Fields
char	ssid[32+1]	Service Set Identifier (SSID) null-terminated string.
char	pass[64+1]	Password null-terminated string.
uint8_t	security	Security type (ARM_WIFI_SECURITY_xxx)
uint8_t	ch	WiFi Channel.
uint8_t	rssi	Received Signal Strength Indicator.

Function Documentation

int32_t ARM_WIFI_SetOption	(	uint32_t	interface,
		uint32_t	option,
		const void *	data,
		uint32_t	len
	)

Set WiFi Module Options.

Parameters

[in]	interface	Interface (0 = Station, 1 = Access Point)
[in]	option	Option to set
[in]	data	Pointer to data relevant to selected option
[in]	len	Length of data (in bytes)

Returns

execution status

ARM_DRIVER_OK : Operation successful
ARM_DRIVER_ERROR : Operation failed
ARM_DRIVER_ERROR_UNSUPPORTED : Operation not supported
ARM_DRIVER_ERROR_PARAMETER : Parameter error (invalid interface, NULL data pointer or len less than option specifies)

The function ARM_WIFI_SetOption sets the value of the specified option of the WiFi module.

The argument interface specifies the interface (0 = Station, 1 = Access Point).

The argument option specifies the option that is to be set (see below).

The argument data points to a buffer containing the value of the option to be set and must be aligned to the data type of the corresponding option.

The argument len specifies the length of the buffer data and must be equal (or higher) to the length of the corresponding option.

Option	Description	Data	Type/Length
ARM_WIFI_BSSID	BSSID of AP to connect or AP	bssid	uint8_t[6]
ARM_WIFI_TX_POWER	Transmit power	power[dbm]	uint32_t
ARM_WIFI_LP_TIMER	Low-power deep-sleep time	time[seconds]	uint32_t
ARM_WIFI_DTIM	DTIM interval	dtim[beacons]	uint32_t
ARM_WIFI_BEACON	Beacon interval	interval[ms]	uint32_t
ARM_WIFI_MAC	MAC address	mac	uint8_t[6]
ARM_WIFI_IP	IPv4 address	ip	uint8_t[4]
ARM_WIFI_IP_SUBNET_MASK	IPv4 subnet mask	mask	uint8_t[4]
ARM_WIFI_IP_GATEWAY	IPv4 gateway address	ip	uint8_t[4]
ARM_WIFI_IP_DNS1	IPv4 primary DNS server address	ip	uint8_t[4]
ARM_WIFI_IP_DNS2	IPv4 secondary DNS server address	ip	uint8_t[4]
ARM_WIFI_IP_DHCP	IPv4 DHCP client/server enable/disable	dhcp (0, 1)	uint32_t
ARM_WIFI_IP_DHCP_POOL_BEGIN	IPv4 DHCP server begin address	ip	uint8_t[4]
ARM_WIFI_IP_DHCP_POOL_END	IPv4 DHCP server end address	ip	uint8_t[4]
ARM_WIFI_IP_DHCP_LEASE_TIME	IPv4 DHCP server lease time	time[seconds]	uint32_t
ARM_WIFI_IP6_GLOBAL	IPv6 global address	ip6	uint8_t[16]
ARM_WIFI_IP6_LINK_LOCAL	IPv6 link-local address	ip6	uint8_t[16]
ARM_WIFI_IP6_SUBNET_PREFIX_LEN	IPv6 subnet prefix length	len (1..127)	uint32_t
ARM_WIFI_IP6_GATEWAY	IPv6 gateway address	ip6	uint8_t[16]
ARM_WIFI_IP6_DNS1	IPv6 primary DNS server address	ip6	uint8_t[16]
ARM_WIFI_IP6_DNS2	IPv6 secondary DNS server address	ip6	uint8_t[16]
ARM_WIFI_IP6_DHCP_MODE	IPv6 DHCP client mode	mode	uint32_t

Example:

uint8_t ip[4];
 
ip[0] = 192U;
ip[1] = 168U;
ip[2] = 0U;
ip[3] = 1U;
 
// Set IP static address of the Station
wifi->SetOption (0U, ARM_WIFI_IP, &ip, sizeof(ip));

int32_t ARM_WIFI_GetOption	(	uint32_t	interface,
		uint32_t	option,
		void *	data,
		uint32_t *	len
	)

Get WiFi Module Options.

Parameters

[in]	interface	Interface (0 = Station, 1 = Access Point)
[in]	option	Option to get
[out]	data	Pointer to memory where data for selected option will be returned
[in,out]	len	Pointer to length of data (input/output) input: maximum length of data that can be returned (in bytes) output: length of returned data (in bytes)

Returns

execution status

ARM_DRIVER_OK : Operation successful
ARM_DRIVER_ERROR : Operation failed
ARM_DRIVER_ERROR_UNSUPPORTED : Operation not supported
ARM_DRIVER_ERROR_PARAMETER : Parameter error (invalid interface, NULL data or len pointer, or *len less than option specifies)

The function ARM_WIFI_GetOption retrieves the current value of the specified option of the WiFi module.

The argument interface specifies the interface (0 = Station, 1 = Access Point).

The argument option specifies the option that is to be retrieved (see ARM_WIFI_SetOption).

The argument data points to a buffer that will be used to store the value of the option and must be aligned to the data type of the corresponding option.

The argument len is a pointer to the length of the buffer at input and returns the length of the option information on the output.

Example:

uint8_t ip[4];          // IP address
uint8_t mask[4];        // Subnet mask
uint8_t gateway[4];     // Gateway address
 
// Get IP address, Subnet mask and Gateway address of the Station
wifi->GetOption (0U, ARM_WIFI_IP, &ip, sizeof(ip));
wifi->GetOption (0U, ARM_WIFI_IP_SUBNET_MASK, &mask, sizeof(mask));
wifi->GetOption (0U, ARM_WIFI_IP_GATEWAY, &gateway, sizeof(gateway));

int32_t ARM_WIFI_Scan	(	ARM_WIFI_SCAN_INFO_t	scan_info[],
		uint32_t	max_num
	)

Scan for available networks in range.

Parameters

[out]	scan_info	Pointer to array of ARM_WIFI_SCAN_INFO_t structures where available Scan Information will be returned
[in]	max_num	Maximum number of Network Information structures to return

Returns

number of ARM_WIFI_SCAN_INFO_t structures returned or error code

value >= 0 : Number of ARM_WIFI_SCAN_INFO_t structures returned
ARM_DRIVER_ERROR : Operation failed
ARM_DRIVER_ERROR_PARAMETER : Parameter error (NULL scan_info pointer or max_num equal to 0)

The function ARM_WIFI_Scan searches for available WiFi networks. Using this function, you can determine which wireless networks are available for the connection. If the network is secured, you must also know the password to connect.

The argument scan_info is a pointer to an array of network information structures, where the available network information will be returned.

The argument max_num specifies maximum number of network information structures, that can be stored to the scan_info.

Example:

ARM_WIFI_SCAN_INFO_t scan_info[8];
 
num = wifi->Scan (scan_info, 8U);
 
// Print SSIDs of available WiFi networks
for (i = 0; i < num; i++) {
  printf ("%d. ssid=%s\n", i, scan_info[i].ssid);
}

int32_t ARM_WIFI_Activate	(	uint32_t	interface,
		const ARM_WIFI_CONFIG_t *	config
	)

Activate interface (Connect to a wireless network or activate an access point).

Parameters

[in]	interface	Interface (0 = Station, 1 = Access Point)
[in]	config	Pointer to ARM_WIFI_CONFIG_t structure where Configuration parameters are located

Returns

execution status

ARM_DRIVER_OK : Operation successful
ARM_DRIVER_ERROR : Operation failed
ARM_DRIVER_ERROR_TIMEOUT : Timeout occurred
ARM_DRIVER_ERROR_UNSUPPORTED : Operation not supported (security type, channel autodetect or WPS not supported)
ARM_DRIVER_ERROR_PARAMETER : Parameter error (invalid interface, NULL config pointer or invalid configuration)

The function ARM_WIFI_Activate activates the specified interface.

The argument interface specifies the interface (0 = Station, 1 = Access Point).

When station interface is specified, the WiFi module connects to a wireless network.

The wireless network trying to connect to must be available, otherwise the operation will fail after a timeout.

Available wireless networks can be scanned by using the function ARM_WIFI_Scan.

When access point interface is specified, the WiFi module creates a wireless network by activating the access point.

The argument config is a pointer to the configuration ARM_WIFI_CONFIG_t which provides information needed to connect to a WiFi network for station interface or information used to configure the access point (AP) for access point interface.

ssid specifies the name of the network to connect to or the network to create.

pass specifies the password for accessing the wireless network.

security specifies the security type which will be used for the connection.

ch specifies the WiFi channel which will be used for the connection. Valid channels for 2.4 GHz frequency are from 1 to 13. If the value for ch = 0, the system automatically selects the channel. For station interface the channel of the AP being connected to is used. For access point interface the module automatically selects the best channel for the WiFi connection.

Note: Optionally BSSID parameter can be also set using ARM_WIFI_SetOption. It allows connection to specific BSSID when connecting to an access point or specifies the BSSID of the access point.

wps_method specifies if WiFi Protected Setup (WPS) is used and which method.

wps_pin specifies the PIN used with WPS (ARM_WIFI_WPS_METHOD_PIN).

With the push-button method, you typically press the button, either real or virtual, both at the access point and the station. No credentials are needed.

With PIN method, you must provide the PIN code that you read from the label or screen on the wireless device.

WPS configuration for station is used when station connects to an access point. It enables to connect without specifying SSID, Password, Security Type or WiFi Channel. The actual network information can be retrieved once connected with ARM_WIFI_GetNetInfo.

WPS configuration for access point is used when access point is activated. Subsequent activate calls re-trigger the WPS procedure.

Note: WPS is typically activated by pressing the WPS button at the access point. During the discovery mode (usually 2 minutes or less) any wireless device may connect to the access point (PIN needs to match when PIN method is selected).

Example:

ARM_WIFI_CONFIG_t wifi_config;
 
wifi_config.ssid = "GuestAccess";
wifi_config.pass = "guest";
wifi_config.security = ARM_WIFI_SECURITY_WPA2;
wifi_config.ch = 0U;
wifi_config.wps_method = ARM_WIFI_WPS_METHOD_NONE;
 
// Connect to wireless network
status = wifi->Activate (0U, &wifi_config);
if (status != ARM_DRIVER_OK) {
  // error handling
}

int32_t ARM_WIFI_Deactivate ( uint32_t interface )

Deactivate interface (Disconnect from a wireless network or deactivate an access point).

Parameters

[in] interface Interface (0 = Station, 1 = Access Point)

Returns

execution status

ARM_DRIVER_OK : Operation successful
ARM_DRIVER_ERROR : Operation failed
ARM_DRIVER_ERROR_PARAMETER : Parameter error (invalid interface)

The function ARM_WIFI_Deactivate deactivates the specified interface.

The argument interface specifies the interface (0 = Station, 1 = Access Point).

When station interface is specified, the WiFi module disconnects from the wireless network.

When access point interface is specified, the WiFi module deactivates the access point.

Example:

see ARM_WIFI_GetNetInfo

uint32_t ARM_WIFI_IsConnected ( void )

Get station connection status.

Returns

station connection status

value != 0: Station connected
value = 0: Station not connected

The function ARM_WIFI_IsConnected checks if the station is connected to a wireless network and returns the connection status.

The function returns a non-zero value, if the station is connected. If the station is not connected, the function returns 0.

Example:

see ARM_WIFI_GetNetInfo

int32_t ARM_WIFI_GetNetInfo ( ARM_WIFI_NET_INFO_t * net_info )

Get station Network Information.

Parameters

[out] net_info Pointer to ARM_WIFI_NET_INFO_t structure where station Network Information will be returned

Returns

execution status

ARM_DRIVER_OK : Operation successful
ARM_DRIVER_ERROR : Operation failed (station not connected)
ARM_DRIVER_ERROR_UNSUPPORTED : Operation not supported
ARM_DRIVER_ERROR_PARAMETER : Parameter error (invalid interface or NULL net_info pointer)

The function ARM_WIFI_GetNetInfo retrieves wireless network information of a connected station.

It can be used to retrieve network connection information for subsequent connections after initially connecting using WPS.

Example:

ARM_WIFI_CONFIG_t wifi_config;
ARM_WIFI_NET_INFO_t net_info;
 
memset(&wifi_config, 0, sizeof(wifi_config));
 
wifi_config.wps_method = ARM_WIFI_WPS_METHOD_PBC;
 
// Connect to wireless network (WPS)
status = wifi->Activate (0U, &wifi_config);
if (status != ARM_DRIVER_OK) {
  // error handling
}
 
// Retrieve network information
if (wifi->IsConnected ()) {
  status = wifi->GetNetInfo (&net_info);
  if (status != ARM_DRIVER_OK) {
    // error handling
  }
  printf("SSID=%s, Password=%s",net_info.ssid, net_info.pass);
}
 
// Disconnect from wireless network
wifi->Deactivate (0U);

Content

Data Structures

Functions

Description

Data Structure Documentation

Function Documentation