Other Parts Discussed in Thread: AM625
Hi,
I am trying to generate PWM output on Am62x Timer4 at u-boot. i have gone through some of the threads and added the code the u-boot.
But cant able to see any output on the Pin. pls guide me where i am going wrong.
In Am62x SK Board, we have a 40 Pin Connector, where Pin number 7 can be configured as Timer4.
Configure the Pin to Timer 4.
__raw_writel(0x00000004, 0x000F41F0); /* Writing to the Pad register of Timer4 */
Reading the frequency register of Timer4 shows that it is Default set to HFOSC0_CLKOUT
=> md.l 0x001081C0 1
001081c0: 00000000
001081c0: 00000000
#define TIMERIO4_TCLR (TIMERIO4_BASE + 0x38)
#define TIMERIO4_TLDR (TIMERIO4_BASE + 0x40)
#define TIMERIO4_TMAR (TIMERIO4_BASE + 0x4C)
#define TIMERIO4_TCRR (TIMERIO4_BASE + 0x3C)
#define TIMERIO4_TIOCP_CFG (TIMERIO4_BASE + 0x10)
#define COUNTER4_PERIOD (0xFFFFD120) /* Period : 1KHz */
#define COUNTER4_DUTY (0xFFFFE88F) /* Duty cycle : 50% */
#define PWM_CONFIG_TCLR (0x00001862) /* Setting in TCLR register : PT, TRG, TCM, SCPWM,CE, PRE, PTV, AR */
#define PWM_ENABLE_TCLR (0x00001863) /* Enable PWM timer : Setting ST bit */
void timer4_config(void)
{
__raw_writel(0X0000000 ,DMTIMER4_TCLR); // stop timer
while((__raw_readl(DMTIMER4_TCLR) & 0x00000001) !=0);
printf("Timer stop\n");
__raw_writel(PWM_CONFIG_TCLR ,DMTIMER4_TCLR); // Configuring the timer
__raw_writel(COUNTER4_PERIOD ,DMTIMER4_TLDR); // Setting period
__raw_writel(COUNTER4_PERIOD ,DMTIMER4_TCRR);
__raw_writel(0x08 ,DMTIMER4_TIOCP_CFG);
__raw_writel(COUNTER4_DUTY ,DMTIMER4_TMAR); // setting the duty cycle
}
And also i can't able to see any Timer nodes declared in k3-am62x-main.dtsi and k3-am625-sk.dts.
Regards
Murali C
