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Network Packet Transmission Overview
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A device’s device’s transmit complete interrupt signals μCμC/TCP-IP that another transmit packet is available to be transmitted or be queued for transmit by the device.
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Figure 7-4 Device transmit complete interrupt and transmit ready signal
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F7-4(1) The μC/TCP-
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IP’s Network Interface Transmit calls NetOS_Dev_TxRdyWait() to wait for a specific network interface device semaphore to become ready and/or available to transmit a packet by waiting (with or without timeout) for the specific network
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interface’s Device Tx Ready Signal to be signaled.
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F7-4(2) When a device is ready and/or available to transmit a packet, the device generates an interrupt which calls the
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device’s BSP-level ISR handler.
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F7-4(3) The device’s BSP-level ISR handler determines which network interface number the specific
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device’s interrupt is signaling and then calls NetIF_ISR_Handler() to handle the transmit complete interrupt.
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F7-4(4) The specific device ISR handlers NetDev_ISR_Handler() calls NetOS_Dev_TxRdySignal() to signal the Device Tx Ready Signal for each packet or descriptor that is now available to transmit by the device.
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F7-4(5) μC/TCP-
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IP’s Network Interface
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Transmit’s call to NetOS_Dev_TxRdyWait() returns since the semaphore is made ready by each available device transmit complete that signals the Device Tx Ready Signal.
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F7-4(6) The Network Interface Transmit then calls the specific network interface and device transmit handler functions to prepare the packet for transmission by the device.