Initializing Timer4 from GEL file (DM8168)

Massimiliano Cialdi

Expert 1995 points

Hi,

starting from GEL file provided by spetrum digital I made some small additions:

#define TIMER4_PERIPHERAL_REGS_BASE    0x48044000 
#define TIMER4_SUPPORT_REGS_BASE    0x48045000 
 
#define TIMER4_REGS_BASE        TIMER4_PERIPHERAL_REGS_BASE 
 
#define    TIMER4_TIDR            ( TIMER4_REGS_BASE + 0x00 ) 
#define    TIMER4_TIOCP_CFG        ( TIMER4_REGS_BASE + 0x10 ) 
#define    TIMER4_IRQ_EOI            ( TIMER4_REGS_BASE + 0x20 ) 
#define    TIMER4_IRQSTATUS_RAW        ( TIMER4_REGS_BASE + 0x24 ) 
#define    TIMER4_IRQSTATUS        ( TIMER4_REGS_BASE + 0x28 ) 
#define    TIMER4_IRQENABKE_SET        ( TIMER4_REGS_BASE + 0x2C ) 
#define    TIMER4_IRQENABKE_CLR        ( TIMER4_REGS_BASE + 0x30 ) 
#define    TIMER4_IRQWAKEEN        ( TIMER4_REGS_BASE + 0x34 ) 
#define    TIMER4_TCLR            ( TIMER4_REGS_BASE + 0x38 ) 
#define    TIMER4_TCRR            ( TIMER4_REGS_BASE + 0x3C ) 
#define    TIMER4_TLDR            ( TIMER4_REGS_BASE + 0x40 ) 
#define    TIMER4_TTGR            ( TIMER4_REGS_BASE + 0x44 ) 
#define    TIMER4_TWPS            ( TIMER4_REGS_BASE + 0x48 ) 
#define    TIMER4_TMAR            ( TIMER4_REGS_BASE + 0x4C ) 
#define    TIMER4_TCAR1            ( TIMER4_REGS_BASE + 0x50 ) 
#define    TIMER4_TSICR            ( TIMER4_REGS_BASE + 0x54 ) 
#define    TIMER4_TCAR2            ( TIMER4_REGS_BASE + 0x58 ) 
 
#define PINCTRL203             ( 0x48140B28 ) 
 
/* ------------------------------------------------------------------------ * 
 *  StartUp_Timer( )                                                        * 
 *      Setup Timer 4                                                     * 
 *                                                                          * 
 * ------------------------------------------------------------------------ */ 
StartUp_Timer() 
{ 
    int TMAR_val = 0x00000010; 
    int TLDR_val = 0xFFFFFFFF - 0x00000020 + 1; 
    int TCLR_val = 0x00001803; 
    int PINCTRL203_val = 0x00000000; 

    GEL_TextOut( "Timer4 init...\n" ); 
   
    GEL_TextOut("\tWrite TMAR %x ",,,,,TMAR_val); 
    WR_MEM_32(TIMER4_TMAR, TMAR_val); 
     
    GEL_TextOut( "\tWrite TLDR %x ",,,,,TLDR_val); 
    WR_MEM_32(TIMER4_TLDR, TLDR_val); 
     
    GEL_TextOut( "\tWrite TCLR %x ",,,,,TCLR_val); 
    WR_MEM_32(TIMER4_TCLR, ); 
     
    GEL_TextOut( "\tWrite PinControl203 %x ",,,,,PINCTRL203_val); 
    WR_MEM_32(PINCTRL203, PINCTRL203_val); 
     
    GEL_TextOut( "Timer4 init done\n" ); 
}

My hope was that there was a PWM signal on pin H33 (TIMER4).

Unfortunately pin H33 doesnt move. I also tried to move this pin "by hand", toggling bit GPO_CFG of TCLR

StartUp_Timer() 
{ 
    GEL_TextOut( "Timer4 init...\n" ); 
     
    GEL_TextOut( "Timer4 loop...\n" ); 
    while(1) 
    { 
        WR_MEM_32(TIMER4_TCLR, 0x00004000); 
        WR_MEM_32(TIMER4_TCLR, 0x00000000); 
    } 
}

but also in this case nothing happens.

where am I wrong?

best regards

over 13 years ago

0 shuai zhou over 13 years ago

Intellectual 320 points

The clock and output reg should be enable.And why you make a clock like this?

0 Massimiliano Cialdi over 13 years ago in reply to shuai zhou

Expert 1995 points

I thought timer's clock were initilized around line 750 and on, isn't it?

Instead, I don't understand your question...

best regards

0 shuai zhou over 13 years ago in reply to Massimiliano Cialdi

Intellectual 320 points

Can you post the timer's clock init code? what is the clock used for in your application program?

0 shuai zhou over 13 years ago in reply to shuai zhou

Intellectual 320 points

i think you need iomap the resoure or config the clock in u-boot

0 Massimiliano Cialdi over 13 years ago in reply to shuai zhou

Expert 1995 points

the original code is this:

http://support.spectrumdigital.com/boards/evm816x/revg/files/evm816x.gel

I added the Timer initialization at the end of the file

best regards

0 shuai zhou over 13 years ago in reply to Massimiliano Cialdi

Intellectual 320 points

but in your way to set the IO port is not config as a clock,it's just a ordinary GPIO(need config pin mux,enable gpio clock and output enabel reg).you can't set the clock's duty cycle and frequency accurately.you nend config the IO port as a TIME4 function.you should set this reg:

at 1952 in TMS320DM816x Technical Reference Manual

00h TIDR Identification Register
10h TIOCP_CFG Timer OCP Configuration Register
20h IRQ_EOI Timer IRQ End-Of-Interrupt Register
24h IRQSTATUS_RAW Timer IRQSTATUS Raw Register
28h IRQSTATUS Timer IRQSTATUS Register
2Ch IRQSTATUS_SET Timer IRQENABLE Set Register
30h IRQSTATUS_CLR Timer IRQENABLE Clear Register
34h IRQWAKEEN Timer IRQ Wakeup Enable Register
38h TCLR Timer Control Register
3Ch TCRR Timer Counter Register
40h TLDR Timer Load Register
44h TTGR Timer Trigger Register
48h TWPS Timer Write Posted Status Register
4Ch TMAR Timer Match Register
50h TCAR1 Timer Capture Register
54h TSICR Timer Synchronous Interface Control Register
58h TCAR2 Timer Capture Register

0 Massimiliano Cialdi over 13 years ago in reply to shuai zhou

Expert 1995 points

This should be done by PINCTRL203 initization as described in chapter 1.17 Pin Multiplexing Control (page 368 of rev b documents, where is explained that the pin is defaulted to TIMER4 function).

Which other register do you refer?

best regards

PS: for curiosity, what revision of document you're referring to?

0 shuai zhou over 13 years ago in reply to Massimiliano Cialdi

Intellectual 320 points

we're using dvrrdk 02.80.00.10 and we enable some external clocks in the u-boot.make sure the pin mux config was the first step and there are other regs need be configured to set Frequency and uty cycle.

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Initializing Timer4 from GEL file (DM8168)