It is a crazy behavior
1. At the beginning my program have worked reasonable
But after some miserable changes in one part of code, another part became crazy.
After some redistribution of code it is working again.
2. I use CCS v5
I use ezdsp5535 usb stick, and I start my program from some examples.
The examples I have got from spectrumdigital teaching_material_C5505 using recommendation to port these examples to C5535 processor.
Also I have used the examples from CSL v2.5
3. For example, the part of code
#define SYS_SPICDR *(volatile ioport Uint16*)(0x3000)
#define SYS_SPICCR *(volatile ioport Uint16*)(0x3001)
Uint16 rSPICDR_Lcd, rSPICCR_Lcd;
void Init_SpiCfgLcd()
{
rSPICDR_Lcd = 10; // 10 minim SPI speed
SYS_SPICDR = rSPICDR_Lcd; // =3 abs minim
rSPICCR_Lcd |= 0x8000; // spi_clk enable
SYS_SPICCR = rSPICCR_Lcd;
…
}
4. Under debugger I can see the disassemble of the code and I can see the SPI control registers
The disassemble is looking reasonable:
Init_SpiCfgLcd:
02399c: 4eff AADD #-1,SP
121 rSPICDR_Lcd = 10; // 10 minim SPI speed
02399e: e6310a004420 MOV #10,*(#04420h)
122 SYS_SPICDR = rSPICDR_Lcd; // =3 abs minim
0239a4: a931004420 MOV *(#04420h),AR1
0239a9: c9513000 MOV AR1,port(#03000h)
123 rSPICCR_Lcd |= 0x8000;
0239ad: f5318000004421 OR #32768,*(#04421h)
124 SYS_SPICCR = rSPICCR_Lcd;
0239b4: a931004421 MOV *(#04421h),AR1
0239b9: c9513001 MOV AR1,port(#03001h)
But the behavior of the SPICDR register is looking totally crazy
At the line 122 everything is reasonable – I have written 10 in the register SPICDR and I can see it immediately.
But at the line 124 it is became crazy : have written 0x8000 in the another register SPICCR but it change the content of SPICDR register (reset to 0)
5. Obviously I have configured something wrong. And this is only one example. Probably another parts of program are also compiled wrong.
According to the documentation, there are many possibilities to make “cpu hang” and I tried to take in to account all that I have found.
I use huge memory model
I use all recommendation in configuration of example project.
6. Excuse me for my English, but please give me some ideas what it could be, what also I could check and change.
Thank you for your attenthion.
