I want to use an MSP430 configured as an SPI Master to boot the DA14586. (using pins P2_0/SPI_CLK, P2_3/SPI_EN, P2_4/SPI_DO, P2_9/SPI_DI as specified in the datasheet). When the MSP430 sends the SPI Master boot protocol (according to UM-B-079 Software Platform Reference Table 40) I don't get a response (I'm expecting ACK or NACK for bytes 3 & 6). Instead, the DA14586 switches to SPI Master and searches for external flash modules (according to the booting sequence in UM-B-079).
How do I make sure the DA14586 knows I'm trying to boot it from an external SPI Master? Is there a time frame that I need to start communicating? It looks like the DA14586 tries to communicate with an external flash after about 13ms (I used an oscilloscope to check). I've been trying to send the Master boot protocol from the MSP430 before 13ms, but it seems to ignore my attempt to boot it.