can not read from hpi port: cy7c67300 | Cypress Semiconductor
can not read from hpi port: cy7c67300
the problem: when my Cy7 is set to bootup as HPI mode, the extern host master can not read any data from the four hpi port register but the last write data that wrtie to the hpi port registers. I dont no what's wrong, help!
when i boot the CY7 bootup as standalone, I config the GPIO as the HPI port, the extern hpi master write then read, read nothing too. but I use the qtudump, i found that the hpi write is successed. this proved the hpi write is ok. but why hpi read not work? Is there anything must be set for HPI port?
additional, I found when read the HPI port register, the data bus connect to HPI_DATA is not drived by the CY7, it hold the last data put on the bus.