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The Init() function generally performs the following operations, however, depending on the device being initialized, functionality may need to be added or removed:
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- Configure clock gating to the MAC device, if applicable. This is generally performed via the network device’s BSP function pointer,
CfgClk(), implemented innet_bsp.c(see section A-3-1).
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- Configure all necessary I/O pins for both an internal or external MAC and PHY, if present. This is generally performed via the network device’s BSP function pointer,
CfgGPIO(), implemented innet_bsp.c(see section A-3-2).
Configure the host interrupt controller for receive and transmit complete interrupts. Additional interrupt services may be initialized depending on the device and driver requirements. This is generally performed via the network device’s BSP function pointer,CfgIntCtrl(), implemented innet_bsp.c(see section A-3-3).
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- For DMA devices: Allocate memory for all necessary descriptors. This is performed via calls to µC/LIB’s memory module.
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- For DMA devices: Initialize all descriptors to their ready states. This may be performed via calls to locally-declared, ‘
static’ functions.
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- Initialize the (R)MII bus interface, if applicable. This generally entails configuring the (R)MII bus frequency which is dependent on the system clock. Static values for clock frequencies should never be used when determining clock dividers. Instead, the driver should reference the associated clock function(s) for getting the system clock or peripheral bus frequencies, and use these values to compute the correct (R)MII bus clock divider(s). This is generally performed via the network device’s BSP function pointer,
ClkFreqGet(), implemented innet_bsp.c(see section A-3-4).
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- Disable the transmitted and receiver (should already be disabled).
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- Disable and clear pending interrupts (should already be cleared).
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- Set
perrtoNET_DEV_ERR_NONEif initialization proceeded as expected. Otherwise, setperrto an appropriate network device error code.