mirror of
https://github.com/MarlinFirmware/Marlin.git
synced 2024-12-15 06:51:40 +00:00
282 lines
10 KiB
C++
282 lines
10 KiB
C++
/* **************************************************************************
|
|
|
|
Marlin 3D Printer Firmware
|
|
Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
|
|
Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com
|
|
|
|
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/>.
|
|
****************************************************************************/
|
|
|
|
#ifdef TARGET_LPC1768
|
|
|
|
#include "../../inc/MarlinConfig.h"
|
|
#include "../Delay.h"
|
|
|
|
HalSerial usb_serial;
|
|
|
|
// U8glib required functions
|
|
extern "C" void u8g_xMicroDelay(uint16_t val) {
|
|
DELAY_US(val);
|
|
}
|
|
extern "C" void u8g_MicroDelay(void) {
|
|
u8g_xMicroDelay(1);
|
|
}
|
|
extern "C" void u8g_10MicroDelay(void) {
|
|
u8g_xMicroDelay(10);
|
|
}
|
|
extern "C" void u8g_Delay(uint16_t val) {
|
|
delay(val);
|
|
}
|
|
//************************//
|
|
|
|
// return free heap space
|
|
int freeMemory() {
|
|
char stack_end;
|
|
void *heap_start = malloc(sizeof(uint32_t));
|
|
if (heap_start == 0) return 0;
|
|
|
|
uint32_t result = (uint32_t)&stack_end - (uint32_t)heap_start;
|
|
free(heap_start);
|
|
return result;
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// ADC
|
|
// --------------------------------------------------------------------------
|
|
|
|
#define ADC_DONE 0x80000000
|
|
#define ADC_OVERRUN 0x40000000
|
|
|
|
void HAL_adc_init(void) {
|
|
LPC_SC->PCONP |= (1 << 12); // Enable CLOCK for internal ADC controller
|
|
LPC_SC->PCLKSEL0 &= ~(0x3 << 24);
|
|
LPC_SC->PCLKSEL0 |= (0x1 << 24); // 0: 25MHz, 1: 100MHz, 2: 50MHz, 3: 12.5MHZ to ADC clock divider
|
|
LPC_ADC->ADCR = (0 << 0) // SEL: 0 = no channels selected
|
|
| (0xFF << 8) // select slowest clock for A/D conversion 150 - 190 uS for a complete conversion
|
|
| (0 << 16) // BURST: 0 = software control
|
|
| (0 << 17) // CLKS: not applicable
|
|
| (1 << 21) // PDN: 1 = operational
|
|
| (0 << 24) // START: 0 = no start
|
|
| (0 << 27); // EDGE: not applicable
|
|
}
|
|
|
|
// externals need to make the call to KILL compile
|
|
#include "../../core/language.h"
|
|
|
|
extern void kill(const char*);
|
|
extern const char errormagic[];
|
|
|
|
void HAL_adc_enable_channel(int ch) {
|
|
pin_t pin = analogInputToDigitalPin(ch);
|
|
|
|
if (pin == -1) {
|
|
SERIAL_PRINTF("%sINVALID ANALOG PORT:%d\n", errormagic, ch);
|
|
kill(MSG_KILLED);
|
|
}
|
|
|
|
int8_t pin_port = LPC1768_PIN_PORT(pin),
|
|
pin_port_pin = LPC1768_PIN_PIN(pin),
|
|
pinsel_start_bit = pin_port_pin > 15 ? 2 * (pin_port_pin - 16) : 2 * pin_port_pin;
|
|
uint8_t pin_sel_register = (pin_port == 0 && pin_port_pin <= 15) ? 0 :
|
|
pin_port == 0 ? 1 :
|
|
pin_port == 1 ? 3 : 10;
|
|
|
|
switch (pin_sel_register) {
|
|
case 1:
|
|
LPC_PINCON->PINSEL1 &= ~(0x3 << pinsel_start_bit);
|
|
LPC_PINCON->PINSEL1 |= (0x1 << pinsel_start_bit);
|
|
break;
|
|
case 3:
|
|
LPC_PINCON->PINSEL3 &= ~(0x3 << pinsel_start_bit);
|
|
LPC_PINCON->PINSEL3 |= (0x3 << pinsel_start_bit);
|
|
break;
|
|
case 0:
|
|
LPC_PINCON->PINSEL0 &= ~(0x3 << pinsel_start_bit);
|
|
LPC_PINCON->PINSEL0 |= (0x2 << pinsel_start_bit);
|
|
break;
|
|
};
|
|
}
|
|
|
|
void HAL_adc_start_conversion(const uint8_t ch) {
|
|
if (analogInputToDigitalPin(ch) == -1) {
|
|
SERIAL_PRINTF("HAL: HAL_adc_start_conversion: invalid channel %d\n", ch);
|
|
return;
|
|
}
|
|
|
|
LPC_ADC->ADCR &= ~0xFF; // Reset
|
|
SBI(LPC_ADC->ADCR, ch); // Select Channel
|
|
SBI(LPC_ADC->ADCR, 24); // Start conversion
|
|
}
|
|
|
|
bool HAL_adc_finished(void) {
|
|
return LPC_ADC->ADGDR & ADC_DONE;
|
|
}
|
|
|
|
// possible config options if something similar is extended to more platforms.
|
|
#define ADC_USE_MEDIAN_FILTER // Filter out erroneous readings
|
|
#define ADC_MEDIAN_FILTER_SIZE (23) // Higher values increase step delay (phase shift),
|
|
// (ADC_MEDIAN_FILTER_SIZE + 1) / 2 sample step delay (12 samples @ 500Hz: 24ms phase shift)
|
|
// Memory usage per ADC channel (bytes): (6 * ADC_MEDIAN_FILTER_SIZE) + 16
|
|
// 8 * ((6 * 23) + 16 ) = 1232 Bytes for 8 channels
|
|
|
|
#define ADC_USE_LOWPASS_FILTER // Filter out high frequency noise
|
|
#define ADC_LOWPASS_K_VALUE (6) // Higher values increase rise time
|
|
// Rise time sample delays for 100% signal convergence on full range step
|
|
// (1 : 13, 2 : 32, 3 : 67, 4 : 139, 5 : 281, 6 : 565, 7 : 1135, 8 : 2273)
|
|
// K = 6, 565 samples, 500Hz sample rate, 1.13s convergence on full range step
|
|
// Memory usage per ADC channel (bytes): 4 (32 Bytes for 8 channels)
|
|
|
|
|
|
// Sourced from https://embeddedgurus.com/stack-overflow/tag/median-filter/
|
|
struct MedianFilter {
|
|
#define STOPPER 0 // Smaller than any datum
|
|
struct Pair {
|
|
Pair *point; // Pointers forming list linked in sorted order
|
|
uint16_t value; // Values to sort
|
|
};
|
|
|
|
Pair buffer[ADC_MEDIAN_FILTER_SIZE] = {}; // Buffer of nwidth pairs
|
|
Pair *datpoint = buffer; // Pointer into circular buffer of data
|
|
Pair small = {NULL, STOPPER}; // Chain stopper
|
|
Pair big = {&small, 0}; // Pointer to head (largest) of linked list.
|
|
|
|
uint16_t update(uint16_t datum) {
|
|
Pair *successor; // Pointer to successor of replaced data item
|
|
Pair *scan; // Pointer used to scan down the sorted list
|
|
Pair *scanold; // Previous value of scan
|
|
Pair *median; // Pointer to median
|
|
uint16_t i;
|
|
|
|
if (datum == STOPPER) {
|
|
datum = STOPPER + 1; // No stoppers allowed.
|
|
}
|
|
|
|
if ( (++datpoint - buffer) >= ADC_MEDIAN_FILTER_SIZE) {
|
|
datpoint = buffer; // Increment and wrap data in pointer.
|
|
}
|
|
|
|
datpoint->value = datum; // Copy in new datum
|
|
successor = datpoint->point; // Save pointer to old value's successor
|
|
median = &big; // Median initially to first in chain
|
|
scanold = NULL; // Scanold initially null.
|
|
scan = &big; // Points to pointer to first (largest) datum in chain
|
|
|
|
// Handle chain-out of first item in chain as special case
|
|
if (scan->point == datpoint) {
|
|
scan->point = successor;
|
|
}
|
|
scanold = scan; // Save this pointer and
|
|
scan = scan->point ; // step down chain
|
|
|
|
// Loop through the chain, normal loop exit via break.
|
|
for (i = 0 ; i < ADC_MEDIAN_FILTER_SIZE; ++i) {
|
|
// Handle odd-numbered item in chain
|
|
if (scan->point == datpoint) {
|
|
scan->point = successor; // Chain out the old datum
|
|
}
|
|
|
|
if (scan->value < datum) { // If datum is larger than scanned value
|
|
datpoint->point = scanold->point; // Chain it in here
|
|
scanold->point = datpoint; // Mark it chained in
|
|
datum = STOPPER;
|
|
}
|
|
|
|
// Step median pointer down chain after doing odd-numbered element
|
|
median = median->point; // Step median pointer
|
|
if (scan == &small) {
|
|
break; // Break at end of chain
|
|
}
|
|
scanold = scan; // Save this pointer and
|
|
scan = scan->point; // step down chain
|
|
|
|
// Handle even-numbered item in chain.
|
|
if (scan->point == datpoint) {
|
|
scan->point = successor;
|
|
}
|
|
|
|
if (scan->value < datum) {
|
|
datpoint->point = scanold->point;
|
|
scanold->point = datpoint;
|
|
datum = STOPPER;
|
|
}
|
|
|
|
if (scan == &small) {
|
|
break;
|
|
}
|
|
|
|
scanold = scan;
|
|
scan = scan->point;
|
|
}
|
|
return median->value;
|
|
}
|
|
};
|
|
|
|
struct LowpassFilter {
|
|
uint32_t data_delay = 0;
|
|
uint16_t update(uint16_t value) {
|
|
data_delay = data_delay - (data_delay >> ADC_LOWPASS_K_VALUE) + value;
|
|
return (uint16_t)(data_delay >> ADC_LOWPASS_K_VALUE);
|
|
}
|
|
};
|
|
|
|
uint16_t HAL_adc_get_result(void) {
|
|
uint32_t adgdr = LPC_ADC->ADGDR;
|
|
CBI(LPC_ADC->ADCR, 24); // Stop conversion
|
|
|
|
if (adgdr & ADC_OVERRUN) return 0;
|
|
uint16_t data = (adgdr >> 4) & 0xFFF; // copy the 12bit data value
|
|
uint8_t adc_channel = (adgdr >> 24) & 0x7; // copy the 3bit used channel
|
|
|
|
#ifdef ADC_USE_MEDIAN_FILTER
|
|
static MedianFilter median_filter[NUM_ANALOG_INPUTS];
|
|
data = median_filter[adc_channel].update(data);
|
|
#endif
|
|
|
|
#ifdef ADC_USE_LOWPASS_FILTER
|
|
static LowpassFilter lowpass_filter[NUM_ANALOG_INPUTS];
|
|
data = lowpass_filter[adc_channel].update(data);
|
|
#endif
|
|
|
|
return ((data >> 2) & 0x3FF); // return 10bit value as Marlin expects
|
|
}
|
|
|
|
#define SBIT_CNTEN 0
|
|
#define SBIT_PWMEN 2
|
|
#define SBIT_PWMMR0R 1
|
|
|
|
#define PWM_1 0 //P2_00 (0-1 Bits of PINSEL4)
|
|
#define PWM_2 2 //P2_01 (2-3 Bits of PINSEL4)
|
|
#define PWM_3 4 //P2_02 (4-5 Bits of PINSEL4)
|
|
#define PWM_4 6 //P2_03 (6-7 Bits of PINSEL4)
|
|
#define PWM_5 8 //P2_04 (8-9 Bits of PINSEL4)
|
|
#define PWM_6 10 //P2_05 (10-11 Bits of PINSEL4)
|
|
|
|
void HAL_pwm_init(void) {
|
|
LPC_PINCON->PINSEL4 = _BV(PWM_5) | _BV(PWM_6);
|
|
|
|
LPC_PWM1->TCR = _BV(SBIT_CNTEN) | _BV(SBIT_PWMEN);
|
|
LPC_PWM1->PR = 0x0; // No prescalar
|
|
LPC_PWM1->MCR = _BV(SBIT_PWMMR0R); // Reset on PWMMR0, reset TC if it matches MR0
|
|
LPC_PWM1->MR0 = 255; // set PWM cycle(Ton+Toff)=255)
|
|
LPC_PWM1->MR5 = 0; // Set 50% Duty Cycle for the channels
|
|
LPC_PWM1->MR6 = 0;
|
|
|
|
// Trigger the latch Enable Bits to load the new Match Values MR0, MR5, MR6
|
|
LPC_PWM1->LER = _BV(0) | _BV(5) | _BV(6);
|
|
// Enable the PWM output pins for PWM_5-PWM_6(P2_04 - P2_05)
|
|
LPC_PWM1->PCR = _BV(13) | _BV(14);
|
|
}
|
|
|
|
#endif // TARGET_LPC1768
|