DA14530 Booting from 2-wird UART not SPI slave issue.

Question

Currently on a customized board, the DA14530 needs to be enabled via 2-wired UART. But when I do the REST PING action, RX only receives 0x00 and not 0x02. Why is this? 
 There was originally a flash on the customized board but it has been removed. Will this have any impact? My EVB board is normal.

OV_Renesas · Answer

Hi There, Thank you for the reply. You can also refer here: 6. Appendix &mdash; DA14585/DA14531 SW Platform Reference Manual (renesas.com) Regarding the P0_0 (HW Reset): Please refer on DA14530 Datasheet, on section 5. Reset, page:50 And from Pinout: And on AN-B-075: DA14530/531 Hardware Guidelines (renesas.com) , on section A.2 Booting Sequence and P0_0, page:41 Finally the procedure for UART boot should look like this: Are you using an External MCU or SmartSnippets Toolbox to download the FW into the DA14530 SRAM? 
 00u18c18kvkwzgwmH358 said: Will STX only be sent once? 
 Yes, STX will be sent only once. In case of Fail you will have to restart the procedure. Best Regards, OV_Renesas

OV_Renesas · Answer

Hi There, Thank you for the reply. 
 00u18c18kvkwzgwmH358 said: If you want to send STX packets again, you must restart (power off/on)? Is this understanding correct? 
 Yes, that is correct. 
 00u18c18kvkwzgwmH358 said: Currently encountering a problem, the default state is low. For P0_0 pull-high and then pull-down, a 0x00 packet is received. Therefore, we need to change it to the default high state and pull-down P0_0 through gpio control before sending the STX packet? 
 I used the following command with CLI: SmartSnippetsToolbox.exe -type booter -chip DA14531 -com_port 48 -uart P0_0 -file flash_programmer_531.bin My connections on the Dev Kit Pro are the following: The result from CLI: Launching SmartSnippets Toolbox v5.0.24.4128
Loaded the following properties from C:\Users\ovasinio\SmartSnippetsToolbox\properties.txt
{Enable_FlashCode_NVParams=true, Enable_FlashCode_ProductHeaderBackup=true, Enable_FlashCode_ConfigurationScript=true, ENABLE_PART=true, Enable_FlashCode_FirmwareImage1=true, ENABLE_HIDDEN_TOOLS=true, ENABLE_TS=true, Enable_FlashCode_FirmwareImage2=true, Enable_FlashCode_ProductHeader=true, ENABLE_MP=true, ENABLE_TE=true}
Command line arguments:
-type booter -chip DA14531 -com_port 48 -uart P0_0 -file flash_programmer_531.bin
Connection to COM48 port has successfully opened.
Started download procedure...
Please press the hardware reset button on the board to start the download process.
Reset detected
Successfully disconnected from port COM48.
Successfully downloaded firmware file to the board. During this procedure I had probed a logic analyzer on P0_0 and P0_1: After the HW Reset, I zoom in the P0_1: Indeed we receive 0x00, which is expected since P0_1 original state is Pull Down: In less than 5ms the ROM bootloader has been loaded and P0_1 is configured for UART operation. We then immediately receive 0x02 (STX) We proceed then with SOH from P0_0 Finally we can see that P0_1 responds with ACK (0x06) and we start sending the FW. I did this on DA14531 but the exact same sequence applies for DA14530. I think that the 0x00 packet you receive on P0_1 is due to the Initial Reset state of P0_1 after the HW Reset and before the ROM bootloader has started. After this you do not receive the 0x02 at all? If this issue persists, please share with us your Schematic and Layout files so we can submit them for a HW Review. Best Regards, OV_Renesas

OV_Renesas · Answer

Hi There, Thank you for the reply. 
 00u18c18kvkwzgwmH358 said: I only received 0x00 packets but not STX (0x02) packets. What could be the reason? 
 The ROM Bootloader might be "stuck" on another boot step expecting a reply. We would need to see your Schematic and Layout files to determine that there is not an issue with the HW. If you do not want to share them here (Public forum), you can create a private ticket. For Private Tickets please refer here: Technical Support Services | Support Forums & Ticket Assistance - Renesas | Renesas 
 You can reference this Forum ticket so we can keep track of your issue. Everything on the Private tickets is confidential. We can submit your design for a HW Review by our BLE HW Support Team. Best Regards, OV_Renesas