help! why extern master can write through HPI port but cannot read with the same config.(CY7C67300) | Cypress Semiconductor
help! why extern master can write through HPI port but cannot read with the same config.(CY7C67300)
Ask for help!
I use a CY7C67300 to transfer data from DSP to PC, the CY7's HPI port is contect to the DSP's EMIF; the SIE2 A port is configed as perpheral usb to PC.
when I set the CY7 into standalone mode, I use the qtudump tool to write 0xc006 as 0x500(set GPIO as HPI port),then DSP can write data to CY7's IRAM with HPI DMA.But the DSP cannot read from CY7' IRAM through HPI port. Why?
When I set the CY7 into HPI mode, I connect the GPIO31 and GPIO30 direct to ground; the dsp can write the firmware to CY7 and init the SIE2 A port as perpheral usb, then the PC can recognize the CY7. But also, the dsp cannot read from the CY7 IRAM.
HPI DMA can write only, cannot read! I dont kown why, beg your help!