/* **************************************************************************
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 .
****************************************************************************/
#ifdef TARGET_LPC1768
#include "../../inc/MarlinConfig.h"
extern "C" {
//#include
//#include
}
HalSerial usb_serial;
//u8glib required fucntions
extern "C" void u8g_xMicroDelay(uint16_t val) {
delayMicroseconds(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) {
MYSERIAL.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;
};
}
uint8_t active_adc = 0;
void HAL_adc_start_conversion(const uint8_t ch) {
if (analogInputToDigitalPin(ch) == -1) {
MYSERIAL.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
active_adc = ch;
}
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_USE_LOWPASS_FILTER // filter out high frequency noise
#define ADC_LOWPASS_K_VALUE 4 // how much to smooth out noise (1:8)
struct MedianFilter {
uint16_t values[3];
uint8_t next_val;
MedianFilter() {
next_val = 0;
values[0] = values[1] = values[2] = 0;
}
uint16_t update(uint16_t value) {
values[next_val++] = value;
next_val = next_val % 3;
return max(min(values[0], values[1]), min(max(values[0], values[1]), values[2])); //median
}
};
uint16_t lowpass_filter(uint16_t value) {
const uint8_t k_data_shift = ADC_LOWPASS_K_VALUE;
static uint32_t data_delay[NUM_ANALOG_INPUTS] = { 0 };
uint32_t &active_filter = data_delay[active_adc];
active_filter = active_filter - (active_filter >> k_data_shift) + value;
return (uint16_t)(active_filter >> k_data_shift);
}
uint16_t HAL_adc_get_result(void) {
uint32_t data = LPC_ADC->ADGDR;
CBI(LPC_ADC->ADCR, 24); // Stop conversion
if (data & ADC_OVERRUN) return 0;
#ifdef ADC_USE_MEDIAN_FILTER
static MedianFilter median_filter[NUM_ANALOG_INPUTS];
data = median_filter[active_adc].update((uint16_t)data);
#endif
#ifdef ADC_USE_LOWPASS_FILTER
data = lowpass_filter((uint16_t)data);
#endif
return ((data >> 6) & 0x3ff); // 10bit
}
#define SBIT_CNTEN 0
#define SBIT_PWMEN 2
#define SBIT_PWMMR0R 1
#define PWM_1 0 //P2_0 (0-1 Bits of PINSEL4)
#define PWM_2 2 //P2_1 (2-3 Bits of PINSEL4)
#define PWM_3 4 //P2_2 (4-5 Bits of PINSEL4)
#define PWM_4 6 //P2_3 (6-7 Bits of PINSEL4)
#define PWM_5 8 //P2_4 (8-9 Bits of PINSEL4)
#define PWM_6 10 //P2_5 (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_4 - P2_5)
LPC_PWM1->PCR = _BV(13) | _BV(14);
}
#endif // TARGET_LPC1768