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- Hantro 6280/7280/8270/8290 Encoder Wrapper Layer
- Three implementations of the EWL exist:
- - ewl_x280_file.c
- + A stand-alone user-space implementation, no HW, input from file
- + Used for software testing and simulations
- - ewl_x280_polling.c ewl_x280_common.c ewl_linux_lock.c
- + A user-space implementation, polling used instead of interrupts
- + Requires the kernel driver just for getting the HW IO base
- - ewl_x280_irq.c ewl_x280_common.c ewl_linux_lock.c
- + EWL for Linux that requires a kernel driver to handle the interrupts
- + Kernel driver implemented for Linux kernel 2.6
- NOTES:
- - ewl_x280_common.c contains common parts for linux
- - ewl_linux_lock.c contains the linux binary semaphore handling for
- multi-instance
-
- The kernel driver is built separately from the codec library and loaded into
- the kernel. The user space interface is compiled into the codec library.
- These two communicate using signals and standard device I/O.
- Compile time parameters:
- EWL_NO_HW_TIMEOUT - EWL does not support timed wait. Always define!
- SDRAM_LM_BASE=n - base address of the RAM as seen by HW
- (0x80000000 in Integrator and 0x00 in Versatile)
- ENC_IO_BASE=n - base address of the HW IO registers
- ENC_MODULE_PATH=n - path of the encoder device file used to communicate with the
- kernel driver
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