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pwmcmds: Export the maximum PWM value 

Instead of assuming the maximum PWM value is 255, export a constant
from the firmware to the host with the maximum value.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-05-07 17:33:45 -04:00
parent a361b92184
commit 5c4cc0d646
5 changed files with 23 additions and 14 deletions
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8
docs/MCU_Commands.md
View File

@ -50,7 +50,7 @@ Common startup commands:
may be useful for configuring the initial value of LEDs and for
configuring the initial value of stepper driver micro-stepping pins.
* `set_pwm_out pin=%u cycle_ticks=%u value=%c` : This command will
* `set_pwm_out pin=%u cycle_ticks=%u value=%hu` : This command will
immediately configure the given pin to use hardware based
pulse-width-modulation (PWM) with the given number of
cycle_ticks. The "cycle_ticks" is the number of MCU clock ticks each
@ -148,7 +148,7 @@ This section lists some commonly used config commands.
feature can be used with heater pins to ensure the host does not
enable the heater and then go off-line.
* `config_pwm_out oid=%c pin=%u cycle_ticks=%u default_value=%c
* `config_pwm_out oid=%c pin=%u cycle_ticks=%u default_value=%hu
max_duration=%u` : This command creates an internal object for
hardware based PWM pins that the host may schedule updates for. Its
usage is analogous to config_digital_out - see the description of
@ -205,11 +205,11 @@ only of interest to developers looking to gain insight into Klipper.
same 'oid' parameter must have been issued during micro-controller
configuration.
* `schedule_pwm_out oid=%c clock=%u value=%c` : Schedules a change to
* `schedule_pwm_out oid=%c clock=%u value=%hu` : Schedules a change to
a hardware PWM output pin. See the 'schedule_digital_out' and
'config_pwm_out' commands for more info.
* `schedule_soft_pwm_out oid=%c clock=%u value=%c` : Schedules a
* `schedule_soft_pwm_out oid=%c clock=%u value=%hu` : Schedules a
change to a software PWM output pin. See the 'schedule_digital_out'
and 'config_soft_pwm_out' commands for more info.

12
klippy/mcu.py
View File

@ -272,7 +272,6 @@ class MCU_digital_out:
self.set_digital(mcu_time, dval)
class MCU_pwm:
PWM_MAX = 255.
def __init__(self, mcu, pin, cycle_time, hard_cycle_ticks, max_duration):
self._mcu = mcu
self._hard_cycle_ticks = hard_cycle_ticks
@ -280,6 +279,7 @@ class MCU_pwm:
pin, pullup, self._invert = parse_pin_extras(pin)
self._last_clock = 0
self._mcu_freq = 0.
self._pwm_max = 0.
self._cmd_queue = mcu.alloc_command_queue()
if hard_cycle_ticks:
mcu.add_config_cmd(
@ -297,16 +297,20 @@ class MCU_pwm:
def build_config(self):
self._mcu_freq = self._mcu.get_mcu_freq()
if self._hard_cycle_ticks:
self._pwm_max = self._mcu.serial.msgparser.get_constant_float(
"PWM_MAX")
self._set_cmd = self._mcu.lookup_command(
"schedule_pwm_out oid=%c clock=%u value=%c")
"schedule_pwm_out oid=%c clock=%u value=%hu")
else:
self._pwm_max = self._mcu.serial.msgparser.get_constant_float(
"SOFT_PWM_MAX")
self._set_cmd = self._mcu.lookup_command(
"schedule_soft_pwm_out oid=%c clock=%u value=%c")
"schedule_soft_pwm_out oid=%c clock=%u value=%hu")
def set_pwm(self, mcu_time, value):
clock = int(mcu_time * self._mcu_freq)
if self._invert:
value = 1. - value
value = int(value * self.PWM_MAX + 0.5)
value = int(value * self._pwm_max + 0.5)
msg = self._set_cmd.encode(self._oid, clock, value)
self._mcu.send(msg, minclock=self._last_clock, reqclock=clock
, cq=self._cmd_queue)

2
src/avr/gpio.c
View File

@ -162,6 +162,8 @@ static const uint8_t pwm_pins[ARRAY_SIZE(pwm_regs)] PROGMEM = {
#endif
};
DECL_CONSTANT(PWM_MAX, 255);
struct gpio_pwm
gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val)
{

9
src/gpiocmds.c
View File

@ -90,6 +90,9 @@ DECL_COMMAND(command_set_digital_out, "set_digital_out pin=%u value=%c");
* Soft PWM output pins
****************************************************************/
#define MAX_SOFT_PWM 255
DECL_CONSTANT(SOFT_PWM_MAX, MAX_SOFT_PWM);
struct soft_pwm_s {
struct timer timer;
uint32_t on_duration, off_duration, end_time;
@ -159,7 +162,7 @@ command_config_soft_pwm_out(uint32_t *args)
struct soft_pwm_s *s = oid_alloc(args[0], command_config_soft_pwm_out
, sizeof(*s));
s->cycle_time = args[2];
s->pulse_time = s->cycle_time / 255;
s->pulse_time = s->cycle_time / MAX_SOFT_PWM;
s->default_value = !!args[3];
s->max_duration = args[4];
s->flags = s->default_value ? SPF_ON : 0;
@ -177,7 +180,7 @@ command_schedule_soft_pwm_out(uint32_t *args)
uint8_t value = args[2];
uint8_t next_flags = SPF_CHECK_END | SPF_HAVE_NEXT;
uint32_t next_on_duration, next_off_duration;
if (value == 0 || value == 255) {
if (value == 0 || value == MAX_SOFT_PWM) {
next_on_duration = next_off_duration = 0;
next_flags |= value ? SPF_NEXT_ON : 0;
if (!!value != s->default_value && s->max_duration)
@ -208,7 +211,7 @@ command_schedule_soft_pwm_out(uint32_t *args)
irq_enable();
}
DECL_COMMAND(command_schedule_soft_pwm_out,
"schedule_soft_pwm_out oid=%c clock=%u value=%c");
"schedule_soft_pwm_out oid=%c clock=%u value=%hu");
static void
soft_pwm_shutdown(void)

6
src/pwmcmds.c
View File

@ -43,7 +43,7 @@ command_config_pwm_out(uint32_t *args)
p->max_duration = args[4];
}
DECL_COMMAND(command_config_pwm_out,
"config_pwm_out oid=%c pin=%u cycle_ticks=%u default_value=%c"
"config_pwm_out oid=%c pin=%u cycle_ticks=%u default_value=%hu"
" max_duration=%u");
void
@ -57,7 +57,7 @@ command_schedule_pwm_out(uint32_t *args)
sched_add_timer(&p->timer);
}
DECL_COMMAND(command_schedule_pwm_out,
"schedule_pwm_out oid=%c clock=%u value=%c");
"schedule_pwm_out oid=%c clock=%u value=%hu");
static void
pwm_shutdown(void)
@ -75,4 +75,4 @@ command_set_pwm_out(uint32_t *args)
{
gpio_pwm_setup(args[0], args[1], args[2]);
}
DECL_COMMAND(command_set_pwm_out, "set_pwm_out pin=%u cycle_ticks=%u value=%c");
DECL_COMMAND(command_set_pwm_out, "set_pwm_out pin=%u cycle_ticks=%u value=%hu");