-----Original Message-----
From: Anders Dam Kofoed [mailto:adk(a)accipio.dk]
Sent: Wednesday, March 23, 2016 8:01 AM
To: devel(a)lists.zephyrproject.org
Subject: [devel] FRDM-K64 PWM BUS Fault

Hi all,

I am trying to use the PWM output on the K64 board. I have taken the
sample/drivers/pwm_dw/src/main.c and modified it to use the
CONFIG_PWM_K64_FTM_0_DEV_NAME and removed the
CONFIG_PWM_DW=y from the prj.conf. Compiles without errors or
warnings. Using the latest 0.75 SDK and zephyr-project code I get this on the
terminal when running it:

PWM demo app
***** BUS FAULT *****
Executing thread ID (thread): 0x20001b28
Faulting instruction address: 0x00000b78
Imprecise data bus error
Fatal fault in task ! Aborting task.

---
prj.conf:
---
CONFIG_STDOUT_CONSOLE=y
CONFIG_PRINTK=y
CONFIG_NANO_TIMERS=y
CONFIG_NANO_TIMEOUTS=y
CONFIG_GPIO=y
CONFIG_PWM=y
---

CODE:
---
#include <zephyr.h>

#if defined(CONFIG_STDOUT_CONSOLE)
#include <stdio.h>
#define PRINT printf
#else
#include <misc/printk.h>
#define PRINT printk
#endif

#include <device.h>
#include <pwm.h>
#include <sys_clock.h>

/* about 1 ms */
#define MIN_PERIOD 32000

/* about 1 second */
#define MAX_PERIOD 32000000

#define SLEEPTICKS SECONDS(4)

void main(void)
{
struct nano_timer timer;
void *timer_data[1];
struct device *pwm_dev;
uint32_t period;
uint8_t dir;

nano_timer_init(&timer, timer_data);

PRINT("PWM demo app\n");

pwm_dev =
device_get_binding(CONFIG_PWM_K64_FTM_0_DEV_NAME);
if (!pwm_dev) {
PRINT("Cannot find %s!\n",
CONFIG_PWM_K64_FTM_0_DEV_NAME);
}

period = MAX_PERIOD;
dir = 0;

while (1) {
pwm_pin_set_values(pwm_dev, 0, period, period);
//pwm_pin_set_duty_cycle(pwm_dev, 0, 40);

if (dir) {
period *= 2;

if (period > MAX_PERIOD) {
dir = 0;
period = MAX_PERIOD;
}
} else {
period /= 2;

if (period < MIN_PERIOD) {
dir = 1;
period = MIN_PERIOD;
}
}

nano_timer_start(&timer, SLEEPTICKS);
nano_timer_test(&timer, TICKS_UNLIMITED);
}
}

I have found another way to do what I want so no rush. Just wanted to state
that it's not working.

Kind regards
Anders Dam Kofoed