platform: mcu fs32k144, SPI communication to MC33771B.
a.wakeup mc33771 for BCS Pin.
b.Reset mc33771 for Write mc33771 SYS_CFG1.(not respond)
c.Assign CID for Write mc33771 INIT.(not respond)
Problem: from the appearance point of view, there is no corresponding command for Mc33771.
Logical analysis shows that the data has been sent according to the standard.
What's going on here!
There are some things you should take care about:
* Systems using only SPI communication to the 33771 may leave RDTX_OUT+ and RDTX_OUT– unterminated or may short them to ground.
Messages having less or more than 40 bits, incorrect CRC, or incorrect SCLK/RDTX_IN– phase are disregarded. Communication faults set the COM_ERR_FLT fault bit in the FAULT1_STATUS register and increments the COM_STATUS[COM_ERR_COUNT] register.
Note: It is required that the SCLK/RDTX_IN– input is low before the falling edge of CSB (SCLK/RDTX_IN– phase).