Other Parts Discussed in Thread: MSP430FR4133,
Hi eveyone.
We designed own circuit for am project with TRF7970A chip. MCU is MSP430FR4133 and powered 3V3 DC
In own design we took TRF7970A datasheet as reference an performed wire connections according to its datasheet.
But, we have a problem with SPI communication between MCU and TRF7970A chip. Sequence is below;
1. Power Up TRF (EN pin H)
2. Send SPI read command. Read ISO Control Register (for example)
3. Show SPI received data with UART
Default value of ISO Control Register is 0x02 right? But, I am receiving 0x00 sometimes, and sometimes 0xC1 etc and sometimes 0x00.
CPOL=0 and CPHA =1, SPI Clock MCLK/4 (2 MHZ), and using SS pin.
What is the wrong thing?