Dear All :
I want the ADSP-21479 be a slave device and the ADSP-21479 can recevice the master command and transfer data to master !
Attached file is my sample code!
My question is I don't know why ? when I send read command I always need send the command twice ans the data value will be correct !
for example :
To read Data_Temp[2] value(0xcc) ,master send the read command -> 030200
03 - INSTR
02 - Address
00 - Value - for write command
// In begin the *pTXSPIB is 0 and in switch case set *pTXSPIB = Data_Temp[Address] (0xcc)
// MISO pin measure is 0,but the *pTXSPIB is 0xcc, get fail value(0x00) ?
send the read command aging -> 030200
// the *pTXSPIB is 0xcc and in switch case set *pTXSPIB = Data_Temp[Address] (0xcc)
// MISO pin measure is 0xcc,and the *pTXSPIB is 0xcc, get correct data in this time(0xcc)!
But, continue to read other Data_Temp value
To read Data_Temp[0] value(0xaa) master send the read command -> 030000
// the *pTXSPIB is 0xcc now and in switch case set *pTXSPIB = Data_Temp[Address] (0xaa)
// MISO pin measure is 0xcc,but the *pTXSPIB is 0xaa ,get fail value(0xcc) ?
send the read command aging -> 030000
// the *pTXSPIB is 0xaa and in switch case set *pTXSPIB = Data_Temp[Address] (0xaa)
// MISO pin measure is 0xaa,and the *pTXSPIB is 0xaa, get correct data in this time(0xaa)!
I don't know why I want to get correct data always need to send the master command twice?
Where is the problem? Who can tell me?
Thanks !!