Hi
I use SPI4 of OMAP3 which mux with mcbsp. And the I/O direction config of spi4_clk confused me. The spi_clk of OMAP3 should be output. But I must set
spi_clk to bidirectional mode. Otherwise the SPI bus don't work well. Anyone knows the reason?
The code is as following:
OMAP3_MUX(MCBSP1_CLKR, OMAP_MUX_MODE1|OMAP_PIN_INPUT),
OMAP3_MUX(MCBSP1_DR, OMAP_MUX_MODE1|OMAP_PIN_INPUT),
OMAP3_MUX(MCBSP1_DX, OMAP_MUX_MODE1|OMAP_PIN_OUTPUT),
OMAP3_MUX(MCBSP1_FSX, OMAP_MUX_MODE1|OMAP_PIN_OUTPUT)
The INPUTENABLE bit is described in tech ref as following
• INPUTENABLE (1 bit) drives an input enable signal to the I/O CTRL.
– INPUTENABLE = 0: Input Disable. Pin is configured in output only mode.
– INPUTENABLE = 1: Input Enable. Pin is configured in bidirectional mode.
