bissen21/Marlin_Firmware
1
0
Fork 0
Code Issues Pull Requests Projects Releases 4 Wiki Activity

Servo & PWM support for LPC1768 (#7500)

Browse Source
This commit is contained in:
Bob-the-Kuhn 2017-08-14 14:40:13 -05:00 committed by Scott Lahteine
parent 859fa35287
commit 97444391e0
10 changed files with 739 additions and 86 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

382
Marlin/src/HAL/HAL_LPC1768/LPC1768_PWM.h Normal file
View File

@ -0,0 +1,382 @@
/**
* Marlin 3D Printer Firmware
* Copyright (C) 2017 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* The class Servo uses the PWM class to implement it's functions
*
* The PWM1 module is only used to generate interrups at specified times. It
* is NOT used to directly toggle pins. The ISR writes to the pin assigned to
* that interrupt
*
* All PWMs use the same repetition rate - 20mS because that's the normal servo rate
*
*/
/**
* The data structures are setup to minimize the computation done by the ISR which
* minimizes ISR execution time. Execution times are 1.7 to 1.9 microseconds.
*
* Two tables are used. active_table is used by the ISR. Changes to the table are
* are done by copying the active_table into the work_table, updating the work_table
* and then swapping the two tables. Swapping is done by manipulating pointers.
*
* Immediately after the swap the ISR uses the work_table until the start of the
* next 20mS cycle. During this transition the "work_table" is actually the table
* that was being used before the swap. The "active_table" contains the data that
* will start being used at the start of the next 20mS period. This keeps the pins
* well behaved during the transition.
*
* The ISR's priority is set to the maximum otherwise other ISRs can cause considerable
* jitter in the PWM high time.
*/
#ifdef TARGET_LPC1768
#include <lpc17xx_pinsel.h>
//#include "../HAL.h"
//#include "../../../macros.h"
#include "serial.h"
typedef struct { // holds all data needed to control the 6 PWM channels
uint8_t sequence; // 0: available slot, 1 - 6: PWM channel assigned to that slot
uint8_t logical_pin;
uint16_t PWM_mask;
volatile uint32_t* set_register;
volatile uint32_t* clr_register;
uint32_t write_mask;
uint32_t microseconds;
uint32_t min;
uint32_t max;
bool PWM_flag; //
uint8_t servo_index; // 0 - MAX_SERVO -1 : servo index, 0xFF : PWM channel
bool active_flag;
} PWM_map;
#define MICRO_MAX 0xffffffff
#define PWM_MAP_INIT_ROW {0, 0xff, 0, 0, 0, 0, MICRO_MAX, 0, 0, 0, 0, 0}
#define PWM_MAP_INIT {PWM_MAP_INIT_ROW,\
PWM_MAP_INIT_ROW,\
PWM_MAP_INIT_ROW,\
PWM_MAP_INIT_ROW,\
PWM_MAP_INIT_ROW,\
PWM_MAP_INIT_ROW,\
};
PWM_map PWM1_map_A[6] = PWM_MAP_INIT;
PWM_map PWM1_map_B[6] = PWM_MAP_INIT;
PWM_map *active_table = PWM1_map_A;
PWM_map *work_table = PWM1_map_B;
PWM_map *ISR_table;
#define NUM_PWMS 6
volatile uint8_t PWM1_ISR_index = 0;
#define IR_BIT(p) (p >= 0 && p <= 3 ? p : p + 4 )
#define COPY_ACTIVE_TABLE for (uint8_t i = 0; i < 6 ; i++) work_table[i] = active_table[i]
#define PIN_IS_INVERTED(p) 0 // place holder in case inverting PWM output is offered
/**
* Prescale register and MR0 register values
*
* 100MHz PCLK 50MHz PCLK 25MHz PCLK 12.5MHz PCLK
* ----------------- ----------------- ----------------- -----------------
* desired prescale MR0 prescale MR0 prescale MR0 prescale MR0 resolution
* prescale register register register register register register register register in degrees
* freq value value value value value value value value
*
* 8 11.5 159,999 5.25 159,999 2.13 159,999 0.5625 159,999 0.023
* 4 24 79,999 11.5 79,999 5.25 79,999 2.125 79,999 0.045
* 2 49 39,999 24 39,999 11.5 39,999 5.25 39,999 0.090
* 1 99 19,999 49 19,999 24 19,999 11.5 19,999 0.180
* 0.5 199 9,999 99 9,999 49 9,999 24 9,999 0.360
* 0.25 399 4,999 199 4,999 99 4,999 49 4,999 0.720
* 0.125 799 2,499 399 2,499 199 2,499 99 2,499 1.440
*
* The desired prescale frequency comes from an input in the range of 544 - 2400 microseconds and the
* desire to just shift the input left or right as needed.
*
* A resolution of 0.2 degrees seems reasonable so a prescale frequency output of 1MHz is being used.
* It also means we don't need to scale the input.
*
* The PCLK is set to 25MHz because that's the slowest one that gives whole numbers for prescale and
* MR0 registers.
*
* Final settings:
* PCLKSEL0: 0x0
* PWM1PR: 0x018 (24)
* PWM1MR0: 0x04E1F (19,999)
*
*/
#define LPC_PWM1_MR0 19999 // base repetition rate minus one count - 20mS
#define LPC_PWM1_PR 24 // prescaler value - prescaler divide by 24 + 1 - 1 MHz output
#define LPC_PWM1_PCLKSEL0 0x00 // select clock source for prescaler - defaults to 25MHz on power up
// 0: 25MHz, 1: 100MHz, 2: 50MHz, 3: 12.5MHZ to PWM1 prescaler
#define MR0_MARGIN 200 // if channel value too close to MR0 the system locks up
void LPC1768_PWM_init(void) {
#define SBIT_CNTEN 0 // PWM1 counter & pre-scaler enable/disable
#define SBIT_CNTRST 1 // reset counters to known state
#define SBIT_PWMEN 3 // 1 - PWM, 0 - timer
#define SBIT_PWMMR0R 1
#define PCPWM1 6
#define PCLK_PWM1 12
LPC_SC->PCONP |= (1 << PCPWM1); // enable PWM1 controller (enabled on power up)
LPC_SC->PCLKSEL0 &= ~(0x3 << PCLK_PWM1);
LPC_SC->PCLKSEL0 |= (LPC_PWM1_PCLKSEL0 << PCLK_PWM1);
LPC_PWM1->MR0 = LPC_PWM1_MR0; // TC resets every 19,999 + 1 cycles - sets PWM cycle(Ton+Toff) to 20 mS
// MR0 must be set before TCR enables the PWM
LPC_PWM1->TCR = _BV(SBIT_CNTEN) | _BV(SBIT_CNTRST)| _BV(SBIT_PWMEN);; // enable counters, reset counters, set mode to PWM
LPC_PWM1->TCR &= ~(_BV(SBIT_CNTRST)); // take counters out of reset
LPC_PWM1->PR = LPC_PWM1_PR;
LPC_PWM1->MCR = (_BV(SBIT_PWMMR0R) | _BV(0)); // Reset TC if it matches MR0, disable all interrupts except for MR0
LPC_PWM1->CTCR = 0; // disable counter mode (enable PWM mode)
LPC_PWM1->LER = 0x07F; // Set the latch Enable Bits to load the new Match Values for MR0 - MR6
// Set all PWMs to single edge
LPC_PWM1->PCR = 0; // single edge mode for all channels, PWM1 control of outputs off
NVIC_EnableIRQ(PWM1_IRQn); // Enable interrupt handler
// NVIC_SetPriority(PWM1_IRQn, NVIC_EncodePriority(0, 10, 0)); // normal priority for PWM module
NVIC_SetPriority(PWM1_IRQn, NVIC_EncodePriority(0, 0, 0)); // minimizes jitter due to higher priority ISRs
}
bool PWM_table_swap; // flag to tell the ISR that the tables have been swapped
bool LPC1768_PWM_attach_pin(uint8_t pin, uint32_t min = 1, uint32_t max = (LPC_PWM1_MR0 - MR0_MARGIN), uint8_t servo_index = 0xff) {
COPY_ACTIVE_TABLE; // copy active table into work table
uint8_t slot = 0;
for (uint8_t i = 0; i < NUM_PWMS ; i++) // see if already in table
if (work_table[i].logical_pin == pin) return 1;
for (uint8_t i = 1; (i < NUM_PWMS + 1) && !slot; i++) // find empty slot
if ( !(work_table[i - 1].set_register)) slot = i; // any item that can't be zero when active or just attached is OK
if (!slot) return 0;
slot--; // turn it into array index
work_table[slot].logical_pin = pin; // init slot
work_table[slot].PWM_mask = 0; // real value set by PWM_write
work_table[slot].set_register = PIN_IS_INVERTED(pin) ? &LPC_GPIO(pin_map[pin].port)->FIOCLR : &LPC_GPIO(pin_map[pin].port)->FIOSET;
work_table[slot].clr_register = PIN_IS_INVERTED(pin) ? &LPC_GPIO(pin_map[pin].port)->FIOSET : &LPC_GPIO(pin_map[pin].port)->FIOCLR;
work_table[slot].write_mask = LPC_PIN(pin_map[pin].pin);
work_table[slot].microseconds = MICRO_MAX;
work_table[slot].min = min;
work_table[slot].max = MIN(max, LPC_PWM1_MR0 - MR0_MARGIN);
work_table[slot].servo_index = servo_index;
work_table[slot].active_flag = false;
//swap tables
NVIC_DisableIRQ(PWM1_IRQn);
PWM_map *pointer_swap = active_table;
active_table = work_table;
work_table = pointer_swap;
PWM_table_swap = true; // tell the ISR that the tables have been swapped
NVIC_EnableIRQ(PWM1_IRQn); // re-enable PWM interrupts
return 1;
}
bool LPC1768_PWM_write(uint8_t pin, uint32_t value) {
COPY_ACTIVE_TABLE; // copy active table into work table
uint8_t slot = 0xFF;
for (uint8_t i = 0; i < NUM_PWMS; i++) // find slot
if (work_table[i].logical_pin == pin) slot = i;
if (slot == 0xFF) return false; // return error if pin not found
digitalWrite(pin, 0); // set pin to output & set it low
work_table[slot].microseconds = MAX(MIN(value, work_table[slot].max), work_table[slot].min);
work_table[slot].active_flag = true;
for (uint8_t i = NUM_PWMS; --i;) { // (bubble) sort table by microseconds
bool didSwap = false;
PWM_map temp;
for (uint16_t j = 0; j < i; ++j) {
if (work_table[j].microseconds > work_table[j + 1].microseconds) {
temp = work_table[j + 1];
work_table[j + 1] = work_table[j];
work_table[j] = temp;
didSwap = true;
}
}
if (!didSwap) break;
}
for (uint8_t i = 0; i < NUM_PWMS; i++) // set the index & PWM_mask
if (work_table[i].active_flag == true) {
work_table[i].sequence = i + 1;
work_table[i].PWM_mask = _BV(IR_BIT(i + 1));
}
else work_table[i].sequence = 0;
uint32_t interrupt_mask = 0; // set match registers to new values, build IRQ mask
if (work_table[0].active_flag == true) {
LPC_PWM1->MR1 = work_table[0].microseconds;
interrupt_mask |= _BV(3);
}
if (work_table[1].active_flag == true) {
LPC_PWM1->MR2 = work_table[1].microseconds;
interrupt_mask |= _BV(6);
}
if (work_table[2].active_flag == true) {
LPC_PWM1->MR3 = work_table[2].microseconds;
interrupt_mask |= _BV(9);
}
if (work_table[3].active_flag == true) {
LPC_PWM1->MR4 = work_table[3].microseconds;
interrupt_mask |= _BV(12);
}
if (work_table[4].active_flag == true) {
LPC_PWM1->MR5 = work_table[4].microseconds;
interrupt_mask |= _BV(15);
}
if (work_table[5].active_flag == true) {
LPC_PWM1->MR6 = work_table[5].microseconds;
interrupt_mask |= _BV(18);
}
interrupt_mask |= _BV(0); // add in MR0 interrupt
// swap tables
NVIC_DisableIRQ(PWM1_IRQn);
LPC_PWM1->LER = 0x07E; // Set the latch Enable Bits to load the new Match Values for MR1 - MR6
PWM_map *pointer_swap = active_table;
active_table = work_table;
work_table = pointer_swap;
PWM_table_swap = true; // tell the ISR that the tables have been swapped
LPC_PWM1->MCR = interrupt_mask; // enable new PWM individual channel interrupts
NVIC_EnableIRQ(PWM1_IRQn); // re-enable PWM interrupts
return 1;
}
bool LPC1768_PWM_detach_pin(uint8_t pin) {
COPY_ACTIVE_TABLE; // copy active table into work table
uint8_t slot = 0xFF;
for (uint8_t i = 0; i < NUM_PWMS; i++) // find slot
if (work_table[i].logical_pin == pin) slot = i;
if (slot == 0xFF) return false; // return error if pin not found
pinMode(pin, INPUT_PULLUP); // set pin to input with pullup
work_table[slot] = PWM_MAP_INIT_ROW;
for (uint8_t i = NUM_PWMS; --i;) { // (bubble) sort table by microseconds
bool didSwap = false;
PWM_map temp;
for (uint16_t j = 0; j < i; ++j) {
if (work_table[j].microseconds > work_table[j + 1].microseconds) {
temp = work_table[j + 1];
work_table[j + 1] = work_table[j];
work_table[j] = temp;
didSwap = true;
}
}
if (!didSwap) break;
}
for (uint8_t i = 0; i < NUM_PWMS; i++) // set the index & PWM_mask
if (work_table[i].active_flag == true) {
work_table[i].sequence = i + 1;
work_table[i].PWM_mask = _BV(IR_BIT(i + 1));
}
else work_table[i].sequence = 0;
uint32_t interrupt_mask = 0; // set match registers to new values, build IRQ mask
if (work_table[0].active_flag == true) {
LPC_PWM1->MR1 = work_table[0].microseconds;
interrupt_mask |= _BV(3);
}
if (work_table[1].active_flag == true) {
LPC_PWM1->MR2 = work_table[1].microseconds;
interrupt_mask |= _BV(6);
}
if (work_table[2].active_flag == true) {
LPC_PWM1->MR3 = work_table[2].microseconds;
interrupt_mask |= _BV(9);
}
if (work_table[3].active_flag == true) {
LPC_PWM1->MR4 = work_table[3].microseconds;
interrupt_mask |= _BV(12);
}
if (work_table[4].active_flag == true) {
LPC_PWM1->MR5 = work_table[4].microseconds;
interrupt_mask |= _BV(15);
}
if (work_table[5].active_flag == true) {
LPC_PWM1->MR6 = work_table[5].microseconds;
interrupt_mask |= _BV(18);
}
interrupt_mask |= _BV(0); // add in MR0 interrupt
// swap tables
NVIC_DisableIRQ(PWM1_IRQn);
LPC_PWM1->LER = 0x07E; // Set the latch Enable Bits to load the new Match Values for MR1 - MR6
PWM_map *pointer_swap = active_table;
active_table = work_table;
work_table = pointer_swap;
PWM_table_swap = true; // tell the ISR that the tables have been swapped
LPC_PWM1->MCR = interrupt_mask; // enable remaining PWM individual channel interrupts
NVIC_EnableIRQ(PWM1_IRQn); // re-enable PWM interrupts
return 1;
}
////////////////////////////////////////////////////////////////////////////////
#define HAL_PWM_LPC1768_ISR extern "C" void PWM1_IRQHandler(void)
HAL_PWM_LPC1768_ISR {
if (PWM_table_swap) ISR_table = work_table; // use old table if a swap was just done
else ISR_table = active_table;
if (LPC_PWM1->IR & 0x1) { // MR0 interrupt
PWM_table_swap = false; // MR0 means new values could have been
ISR_table = active_table; // loaded so set everything to normal operation
for (uint8_t i = 0; (i < NUM_PWMS) && ISR_table[i].active_flag ; i++)
*ISR_table[i].set_register = ISR_table[i].write_mask; // set all enabled channels active
LPC_PWM1->IR = 0x01; // clear the MR0 interrupt flag bit
PWM1_ISR_index = 0;
}
else {
if (ISR_table[PWM1_ISR_index].active_flag && (LPC_PWM1->IR & ISR_table[PWM1_ISR_index].PWM_mask)) {
LPC_PWM1->IR = ISR_table[PWM1_ISR_index].PWM_mask; // clear the interrupt flag bit
*ISR_table[PWM1_ISR_index].clr_register = ISR_table[PWM1_ISR_index].write_mask; // set channel to inactive
}
PWM1_ISR_index++; // should be the index for the next interrupt
}
return;
}
#endif

169
Marlin/src/HAL/HAL_LPC1768/LPC1768_Servo.cpp Normal file
View File

@ -0,0 +1,169 @@
/**
* Marlin 3D Printer Firmware
* Copyright (C) 2016, 2017 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* Based on servo.cpp - Interrupt driven Servo library for Arduino using 16 bit
* timers- Version 2 Copyright (c) 2009 Michael Margolis. All right reserved.
*/
/**
* A servo is activated by creating an instance of the Servo class passing the desired pin to the attach() method.
* The servos are pulsed in the background using the value most recently written using the write() method
*
* Note that analogWrite of PWM on pins associated with the timer are disabled when the first servo is attached.
* Timers are seized as needed in groups of 12 servos - 24 servos use two timers, 48 servos will use four.
*
* The methods are:
*
* Servo - Class for manipulating servo motors connected to Arduino pins.
*
* attach(pin) - Attach a servo motor to an i/o pin.
* attach(pin, min, max) - Attach to a pin, setting min and max values in microseconds
* Default min is 544, max is 2400
*
* write() - Set the servo angle in degrees. (Invalid angles —over MIN_PULSE_WIDTH— are treated as µs.)
* writeMicroseconds() - Set the servo pulse width in microseconds.
* move(pin, angle) - Sequence of attach(pin), write(angle), delay(SERVO_DELAY).
* With DEACTIVATE_SERVOS_AFTER_MOVE it detaches after SERVO_DELAY.
* read() - Get the last-written servo pulse width as an angle between 0 and 180.
* readMicroseconds() - Get the last-written servo pulse width in microseconds.
* attached() - Return true if a servo is attached.
* detach() - Stop an attached servo from pulsing its i/o pin.
*
*/
/**
* The only time that this library wants physical movement is when a WRITE
* command is issued. Before that all the attach & detach activity is solely
* within the data base.
*
* The PWM output is inactive until the first WRITE. After that it stays active
* unless DEACTIVATE_SERVOS_AFTER_MOVE is enabled and a MOVE command was issued.
*
*/
#if HAS_SERVOS
#include "LPC1768_Servo.h"
#include "servo_private.h"
extern bool LPC1768_PWM_attach_pin(uint8_t, uint32_t, uint32_t, uint8_t);
extern bool LPC1768_PWM_write(uint8_t, uint32_t);
extern bool LPC1768_PWM_detach_pin(uint8_t);
ServoInfo_t servo_info[MAX_SERVOS]; // static array of servo info structures
uint8_t ServoCount = 0; // the total number of attached servos
#define US_TO_PULSE_WIDTH(p) p
#define PULSE_WIDTH_TO_US(p) p
#define TRIM_DURATION 0
#define SERVO_MIN() MIN_PULSE_WIDTH // minimum value in uS for this servo
#define SERVO_MAX() MAX_PULSE_WIDTH // maximum value in uS for this servo
Servo::Servo() {
if (ServoCount < MAX_SERVOS) {
this->servoIndex = ServoCount++; // assign a servo index to this instance
servo_info[this->servoIndex].pulse_width = US_TO_PULSE_WIDTH(DEFAULT_PULSE_WIDTH); // store default values - 12 Aug 2009
}
else
this->servoIndex = INVALID_SERVO; // too many servos
}
int8_t Servo::attach(int pin) {
return this->attach(pin, MIN_PULSE_WIDTH, MAX_PULSE_WIDTH);
}
int8_t Servo::attach(int pin, int min, int max) {
if (this->servoIndex >= MAX_SERVOS) return -1;
if (pin > 0) servo_info[this->servoIndex].Pin.nbr = pin; // only assign a pin value if the pin info is
// greater than zero. This way the init routine can
// assign the pin and the MOVE command only needs the value.
this->min = MIN_PULSE_WIDTH; //resolution of min/max is 1 uS
this->max = MAX_PULSE_WIDTH;
servo_info[this->servoIndex].Pin.isActive = true;
return this->servoIndex;
}
void Servo::detach() {
servo_info[this->servoIndex].Pin.isActive = false;
}
void Servo::write(int value) {
if (value < MIN_PULSE_WIDTH) { // treat values less than 544 as angles in degrees (valid values in microseconds are handled as microseconds)
value = map(constrain(value, 0, 180), 0, 180, SERVO_MIN(), SERVO_MAX());
// odd - this sets zero degrees to 544 and 180 degrees to 2400 microseconds but the literature says
// zero degrees should be 500 microseconds and 180 should be 2500
}
this->writeMicroseconds(value);
}
void Servo::writeMicroseconds(int value) {
// calculate and store the values for the given channel
byte channel = this->servoIndex;
if (channel < MAX_SERVOS) { // ensure channel is valid
// ensure pulse width is valid
value = constrain(value, SERVO_MIN(), SERVO_MAX()) - (TRIM_DURATION);
value = US_TO_PULSE_WIDTH(value); // convert to pulse_width after compensating for interrupt overhead - 12 Aug 2009
servo_info[channel].pulse_width = value;
LPC1768_PWM_attach_pin(servo_info[this->servoIndex].Pin.nbr, MIN_PULSE_WIDTH, MAX_PULSE_WIDTH, this->servoIndex);
LPC1768_PWM_write(servo_info[this->servoIndex].Pin.nbr, value);
}
}
// return the value as degrees
int Servo::read() { return map(this->readMicroseconds() + 1, SERVO_MIN(), SERVO_MAX(), 0, 180); }
int Servo::readMicroseconds() {
return (this->servoIndex == INVALID_SERVO) ? 0 : PULSE_WIDTH_TO_US(servo_info[this->servoIndex].pulse_width) + TRIM_DURATION;
}
bool Servo::attached() { return servo_info[this->servoIndex].Pin.isActive; }
void Servo::move(int value) {
if (this->attach(0) >= 0) { // notice the pin number is zero here
this->write(value);
delay(SERVO_DELAY);
#if ENABLED(DEACTIVATE_SERVOS_AFTER_MOVE)
this->detach();
LPC1768_PWM_detach_pin(servo_info[this->servoIndex].Pin.nbr); // shut down the PWM signal
#endif
}
}
#endif // HAS_SERVOS

69
Marlin/src/HAL/HAL_LPC1768/LPC1768_Servo.h Normal file
View File

@ -0,0 +1,69 @@
/**
* Marlin 3D Printer Firmware
* Copyright (C) 2017 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* The class Servo uses the PWM class to implement it's functions
*
* The PWM1 module is only used to generate interrups at specified times. It
* is NOT used to directly toggle pins. The ISR writes to the pin assigned to
* that interrupt
*
* All PWMs use the same repetition rate - 20mS because that's the normal servo rate
*
*/
#ifndef LPC1768_SERVO_h
#define LPC1768_SERVO_h
#ifdef TARGET_LPC1768
#include <inttypes.h>
class Servo {
public:
Servo();
int8_t attach(int pin); // attach the given pin to the next free channel, set pinMode, return channel number (-1 on fail)
int8_t attach(int pin, int min, int max); // as above but also sets min and max values for writes.
void detach();
void write(int value); // if value is < 200 it is treated as an angle, otherwise as pulse width in microseconds
void writeMicroseconds(int value); // write pulse width in microseconds
void move(int value); // attach the servo, then move to value
// if value is < 200 it is treated as an angle, otherwise as pulse width in microseconds
// if DEACTIVATE_SERVOS_AFTER_MOVE wait SERVO_DELAY, then detach
int read(); // returns current pulse width as an angle between 0 and 180 degrees
int readMicroseconds(); // returns current pulse width in microseconds for this servo (was read_us() in first release)
bool attached(); // return true if this servo is attached, otherwise false
private:
uint8_t servoIndex; // index into the channel data for this servo
int min;
int max;
};
#define HAL_SERVO_LIB Servo
#endif
#endif

44
Marlin/src/HAL/HAL_LPC1768/Servo.cpp
View File

@ -1,44 +0,0 @@
/**
* Marlin 3D Printer Firmware
* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/*
Copyright (c) 2013 Arduino LLC. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef TARGET_LPC1768
#endif // ARDUINO_ARCH_SAM

39
Marlin/src/HAL/HAL_LPC1768/arduino.cpp
View File

@ -140,27 +140,34 @@ bool digitalRead(int pin) {
return LPC_GPIO(pin_map[pin].port)->FIOPIN & LPC_PIN(pin_map[pin].pin) ? 1 : 0;
}
void analogWrite(int pin, int pwm_value) {
/*
void analogWrite(int pin, int pwm_value) { // 1 - 254: pwm_value, 0: LOW, 255: HIGH
extern bool LPC1768_PWM_attach_pin(uint8_t, uint32_t, uint32_t, uint8_t);
extern bool LPC1768_PWM_write(uint8_t, uint32_t);
extern bool LPC1768_PWM_detach_pin(uint8_t);
#define MR0_MARGIN 200 // if channel value too close to MR0 the system locks up
static bool out_of_PWM_slots = false;
if (!WITHIN(pin, 0, NUM_DIGITAL_PINS - 1) || pin_map[pin].port == 0xFF)
return;
int old_pin = pin;
int old_value = pwm_value;
if(old_value != 0) {
for(uint16_t x = 0; x <= 5000; x++) {
LPC_GPIO(pin_map[pin].port)->FIOSET = LPC_PIN(pin_map[pin].pin);
//digitalWrite(old_pin, HIGH);
delayMicroseconds(old_value);
LPC_GPIO(pin_map[pin].port)->FIOCLR = LPC_PIN(pin_map[pin].pin);
//pinMode(pin, OUTPUT);
//digitalWrite(old_pin, LOW);
delayMicroseconds(255 - old_value);
uint value = MAX(MIN(pwm_value, 255), 0);
if (value == 0 || value == 255) { // treat as digital pin
LPC1768_PWM_detach_pin(pin); // turn off PWM
digitalWrite(pin, value);
}
else {
if (LPC1768_PWM_attach_pin(pin, 1, (LPC_PWM1->MR0 - MR0_MARGIN), 0xff)) // locks up if get too close to MR0 value
LPC1768_PWM_write(pin, map(value, 1, 254, 1, (LPC_PWM1->MR0 - MR0_MARGIN))); // map 1-254 onto PWM range
else { // out of PWM channels
if (!out_of_PWM_slots) usb_serial.printf(".\nWARNING - OUT OF PWM CHANNELS\n.\n"); //only warn once
out_of_PWM_slots = true;
digitalWrite(pin, value); // treat as a digital pin if out of channels
}
}
*/
}
extern bool HAL_adc_finished();

4
Marlin/src/HAL/HAL_LPC1768/main.cpp
View File

@ -30,6 +30,7 @@ extern "C" {
#include <stdarg.h>
#include "arduino.h"
#include "serial.h"
#include "LPC1768_PWM.h"
static __INLINE uint32_t SysTick_Config(uint32_t ticks) {
if (ticks > SysTick_LOAD_RELOAD_Msk)
@ -86,6 +87,9 @@ int main(void) {
HAL_timer_init();
extern void LPC1768_PWM_init();
LPC1768_PWM_init();
setup();
while (true) {
loop();

87
Marlin/src/HAL/HAL_LPC1768/servo_private.h Normal file
View File

@ -0,0 +1,87 @@
/**
* Marlin 3D Printer Firmware
* Copyright (C) 2016, 2017 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
servo.h - Interrupt driven Servo library for Arduino using 16 bit timers- Version 2
Copyright (c) 2009 Michael Margolis. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* Based on "servo.h - Interrupt driven Servo library for Arduino using 16 bit timers -
* Version 2 Copyright (c) 2009 Michael Margolis. All right reserved.
*
* The only modification was to update/delete macros to match the LPC176x.
*
*/
#ifndef servo_private_h
#define servo_private_h
#include <inttypes.h>
// Macros
//values in microseconds
#define MIN_PULSE_WIDTH 544 // the shortest pulse sent to a servo
#define MAX_PULSE_WIDTH 2400 // the longest pulse sent to a servo
#define DEFAULT_PULSE_WIDTH 1500 // default pulse width when servo is attached
#define REFRESH_INTERVAL 20000 // minimum time to refresh servos in microseconds
#define MAX_SERVOS 4
#define INVALID_SERVO 255 // flag indicating an invalid servo index
// Types
typedef struct {
uint8_t nbr : 8 ; // a pin number from 0 to 254 (255 signals invalid pin)
uint8_t isActive : 1 ; // true if this channel is enabled, pin not pulsed if false
} ServoPin_t;
typedef struct {
ServoPin_t Pin;
unsigned int pulse_width; // pulse width in microseconds
} ServoInfo_t;
// Global variables
extern uint8_t ServoCount;
extern ServoInfo_t servo_info[MAX_SERVOS];
#endif

25
Marlin/src/HAL/HAL_LPC1768/servotimers.h
View File

@ -1,25 +0,0 @@
/*
Copyright (c) 2013 Arduino LLC. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* Defines for 16 bit timers used with Servo library
*
* If _useTimerX is defined then TimerX is a 32 bit timer on the current board
* timer16_Sequence_t enumerates the sequence that the timers should be allocated
* _Nbr_16timers indicates how many timers are available.
*/

2
Marlin/src/HAL/servo.cpp
View File

@ -56,7 +56,7 @@
#include "HAL.h"
#if HAS_SERVOS && !IS_32BIT_TEENSY
#if HAS_SERVOS && !(IS_32BIT_TEENSY || defined(TARGET_LPC1768))
//#include <Arduino.h>

4
Marlin/src/HAL/servo.h
View File

@ -71,6 +71,10 @@
#if IS_32BIT_TEENSY
#include "HAL_TEENSY35_36/HAL_Servo_Teensy.h" // Teensy HAL uses an inherited library
#elif defined(TARGET_LPC1768)
#include "HAL_LPC1768/LPC1768_Servo.cpp"
#else
#include <inttypes.h>