Other Parts Discussed in Thread: CC3120BOOST, CC3120, MSP-EXP432E401Y
Tool/software: TI-RTOS
DESCRIPTION OF THE PROBLEM:
Using the MSP-432E401Y and CC3120BOOST, varied that with SPI 2, or SPI 3 connection to the SPI signals of the CC3120, Wifi works, but not work if SPI 1 is used.
SDK version used:
Simplelink_msp432e4_sdk_2_30_00_14
Simplelink_sdk_wifi_plugin_2_40_00_22
PROCEDURE to IDENTIFY THE PROBLEM:
STEP1: verify Wifi works fine with SPI 2 and SPI 3
The MSP-EXP432E401Y board has two locations for the CC3120BOOST to be plugged in:
- Location close to the Ethernet connector U14 has SPI 3 of the MSP432E connecting to the SPI of the CC3120
- Location away from U14 has SPI 2 of the MSP432E connecting the SPI of the CC3120.
I could make simple modifications in the code to make Wifi work in both SPI 2, and SPI 3.
STEP 2: Verify Wifi not work with SPI 1.
With SPI 3 the following shows the relevant connections between the MSP432E and the CC3120
CC3120 MSP432E
SPI_CLK PQ0 (SPI 3)
SPI_MOSI PQ2 (SPI 3)
SPI_MISO PQ3 (SPI 3)
SPI_CS PP5
IRQ PM7
nHIB PD4
Lift the pins and use short jumpers to change the connections using SPI 1
CC3120 MSP432E
SPI_CLK PB5 (SPI 1)
SPI_MOSI PE4 (SPI 1)
SPI_MISO PE5 (SPI 1)
Keep the rest of signals the same as above.
Modify the code to use SPI 1. Wifi detection failed. Using logic analyzer, I could see the communication on the SPI 1 bus at the beginning, but the communication shut down shortly.
QUESTIONS:
- I am suspicious that this problem causes by a bug in the SPI 1 driver. Or there is some information I need to know when I use SPI 1.
Thank you.
Long
