We are currently working on OM25180FDK connected with a Nordic pn52 evaluation board.
We are porting the NxpNfcRdLib library (version 6.13).
For testing the library we use the example Nfcrdlib_SimplifiedAPI_ISO.
In the first initialization steps the example hangs due to persistence of busy signal after the last spi request.
In particular, the busy signal remains high after requesting the RF status.
I noticed that the problem occurs on the RF status request only if this happens after the disabling EMD_CONTROL.
Below are the SPI communication log and oscilloscope screenshots (yellow=SSEL, blu=BUSY, violet=SPI_CLK):
SPI -> 071202 (Read eeprom. Firmware Version, PHHAL_HW_PN5180_FIRMWARE_VERSION_ADDR. phhalHw_Pn5180.c:phhalHw_Pn5180_Init)
SPI <- 0104 (firmware version 4.1)
SPI -> 071701 (Read eeprom. Test Bus, PHHAL_HW_PN5180_TESTBUS_ENABLE_ADDR. phhalHw_Pn5180.c:phhalHw_Pn5180_Init)
SPI <- 00 (Test Bus disabled)
SPI -> 0201fbffffff (Write reg and Mask. IRQ_ENABLE. Bit 2 = 0. Disable Idle IRQ. phhalHw_Pn5180.c:phhalHw_Pn5180_Init)
SPI -> 0003ffff0f00 (Write reg. IRQ_SET_CLEAR. Clear all IRQs. phhalHw_Pn5180.c:408)
SPI -> 07e801 (Read eeprom. Read MISC_CONFIG value, PHHAL_HW_PN5180_DIGITAL_DELAY_CONFIG_ADDR. phhalHw_Pn5180.c:phhalHw_Pn5180_Init)
SPI <- 03 (Digital Delay enabled)
SPI -> 0228feffffff (Write reg and Mask. EMD_CONTROL. Bit 0 = 0. Disable EMD. phacDiscLoop_Sw.c:phacDiscLoop_Sw_Run)
SPI -> 041d (Read reg. RF_STATUS. phacDiscLoop_Sw_Int.c:phacDiscLoop_Sw_Int_TechDetectActivity)
SPI <- 50505050 (????????)
