PTA Configuration#

You can configure the PTA feature on the SiWG917 by enabling BIT[21] (SL_SI91X_PTA_3WIRE_EN) in the config feature bit-map of the Operation Mode command. Select one of three configuration modes by enabling or disabling Bit [23:22] as shown in the following table.


BIT [23]	BIT [22]	Configuration
0	0	Reserved
0	1	Configuration 1
1	0	Configuration 2
1	1	Configuration 3

Each configuration modifies the behavior of how the GRANT signal is asserted in response to the REQUEST and PRIORITY signals. These behaviors are described in the following table.

Configuration	Description
Configuration 1	The PTA Main aggressively asserts the GRANT signal whenever the REQUEST signal is asserted, regardless of whether the PRIORITY signal is asserted. This behavior causes any ongoing Wi-Fi transmission to be aborted, and GRANT is provided to the PTA Secondary.
Configuration 2	The PTA Main asserts the GRANT signal when the REQUEST signal is active, regardless of whether the PRIORITY signal is asserted. The only exception is during an ongoing ACK or BLOCK ACK transmission in response to a Wi-Fi reception. In such cases, GRANT is provided only if both REQUEST and PRIORITY signals are asserted.
Configuration 3	If a Wi-Fi transmission is in progress, including ACK or BLOCK ACK, the PTA Main does not assert the GRANT signal in response to a REQUEST. However, if both REQUEST and PRIORITY signals are asserted, the PTA Main could assert the GRANT signal.

PTA Main Application Configuration for SiWG917#

Use the SiWG917 throughput application to measure and display throughput values. Refer to the throughput application for more details.
To enable the PTA 3-wire feature, set BIT[21] (SL_SI91X_PTA_3WIRE_EN) in the "config_feature_bit_map" field of the opermode mode command. BIT[22] and BIT[23] are used to select the desired PTA configuration. These bit settings are defined in the "app.c" file under the "sl_wifi_device_configuration_t" structure section.
The "config_feature_bit_map" is activated when BIT[31] is set to 1 in both the "tcp_ip_feature_bit_map" and "ext_tcp_ip_feature_bit_map".
To enable, configure and use the PTA 3-wire feature use the macro below, along with the available configuration options:

#define SL_SI91X_PTA_3WIRE_EN BIT (21)

Configuration options for selecting among configurations 1, 2, and 3, where BIT [22] and BIT [23] are used to set NUM_CONN_EVENTS as shown in the table.
In the table below, the value '0' is reserved for future use. For the PTA 3-wire configuration at the DUT:
- GPIO_7 is used as the Grant pin (driven by the DUT).
- ULP_GPIO_1 is used as the Request input pin.
- ULP_GPIO_6 is used as the Priority input pin.


Mode	BIT [23]	BIT [22]
Reserved	0	0
config1	0	1
config2	1	0
config3	1	1

Update the PTA 3-wire configuration in the "app.c" file as shown below to configure Config 1, Config 2, or Config 3:

.config_feature_bit_map = SL_SI91X_PTA_3WIRE_EN | SL_SI91X_PTA_3WIRE_CONFIG_SEL (config_sel)

Set "config_sel" to 1, 2, or 3 based on the desired configuration mode.

Code Snippet

Note: Run the PTA Main throughput application first, then execute the commands for the PTA Secondary.

PTA Secondary Configuration for EFR32MG21#

To configure the PTA Secondary for the EFR32MG21 device, follow the steps described in PTA Software Setup with the Component Editor. The instructions assume that you have installed Simplicity Studio 5 and EmberZNet SDK 7.x.