MSPM0G1506: SPI 3-wire not working

HIEP HUYNH

Part Number: MSPM0G1506
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hi,

I need help with SPI (Motorola 3-wire with separate CS lines to 2 peripherals) on custom board. I'm sending data to my slave device but the received data on MISO is always 0xff. Am I setting the ChipSelect pin as GPIO output correct? I want to use PA9 and PA3 as GPIO output pins and assign them as SPI Chip Selects for my 2 slave devices.

Please see my sample code. Thanks for the help.

DL_GPIO_initDigitalOutput(GPIO_PORTA_PA9_IOMUX);
DL_GPIO_initDigitalOutput(GPIO_PORTA_PA3_IOMUX);

DL_GPIO_setPins(GPIO_PORTA_PORT, GPIO_PORTA_PA9_PIN | GPIO_PORTA_PA3_PIN );
DL_GPIO_enableOutput(GPIO_PORTA_PORT, GPIO_PORTA_PA9_PIN | GPIO_PORTA_PA3_PIN);

over 1 year ago

0 Eason Zhou over 1 year ago

TI__Mastermind 39775 points

If the receive data is 0xFF, is it possible that the slave setup has some problem. For the GPIO control, I would suggest you to used sysconfig to do the GPIO configuration.

Can you post the wave captured by the oscilloscope?

0 HIEP HUYNH over 1 year ago in reply to Eason Zhou

Prodigy 117 points

Hi,
For SPI0 setup, I'm using "Motorola 3-wire" with SCLK=PA11, PICO=PA5, POCI=PA10.

Then in GPIO of syscfg, I configure #1 chip select pin (PA9) as GPIOs (see 2nd screenshot), also did similarly for #2 chip select pin (PA3) in the same Group GPIO_PORT_A.