Mark Uckermann / DtPWM

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DtPWM.h@3:d7b9697768d8, 2017-04-04 (annotated)

Committer:
dontknowhow
Date:
Tue Apr 04 22:20:38 2017 +0000
Revision:
3:d7b9697768d8
Parent:
2:1ef7ff2f120e
Child:
4:a490a36f1cb1
single channel enable;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dontknowhow 0:f4cf8380dbee 1 #include "mbed.h"
dontknowhow 0:f4cf8380dbee 2
dontknowhow 0:f4cf8380dbee 3 #ifndef DTPWM_H
dontknowhow 0:f4cf8380dbee 4 #define DTPWM_H
dontknowhow 0:f4cf8380dbee 5
dontknowhow 2:1ef7ff2f120e 6 /**
dontknowhow 2:1ef7ff2f120e 7 * Library for fast and high resolution opposite PWM output with
dontknowhow 2:1ef7ff2f120e 8 * controllable dead times
dontknowhow 2:1ef7ff2f120e 9 */
dontknowhow 2:1ef7ff2f120e 10
dontknowhow 2:1ef7ff2f120e 11 /** definitions for interrupt flags, usage in IRS:
dontknowhow 2:1ef7ff2f120e 12 * if ( LPC_PWM1->IR & DTPWM_IF0 ) {
dontknowhow 2:1ef7ff2f120e 13 * // do something on MR0 interrupt
dontknowhow 2:1ef7ff2f120e 14 * LPC_PWM1->IR |= DTPWM_IF0; // reset interrupt flag
dontknowhow 2:1ef7ff2f120e 15 * }
dontknowhow 2:1ef7ff2f120e 16 */
dontknowhow 2:1ef7ff2f120e 17 #define DTPWM_IF0 (1 << 0U)
dontknowhow 2:1ef7ff2f120e 18 #define DTPWM_IF1 (1 << 1U)
dontknowhow 2:1ef7ff2f120e 19 #define DTPWM_IF2 (1 << 2U)
dontknowhow 2:1ef7ff2f120e 20 #define DTPWM_IF3 (1 << 3U)
dontknowhow 2:1ef7ff2f120e 21 #define DTPWM_IF4 (1 << 8U)
dontknowhow 2:1ef7ff2f120e 22 #define DTPWM_IF5 (1 << 9U)
dontknowhow 2:1ef7ff2f120e 23 #define DTPWM_IF6 (1 << 10U)
dontknowhow 2:1ef7ff2f120e 24
dontknowhow 2:1ef7ff2f120e 25 /** definitions for interrupt enable flags, usage:
dontknowhow 2:1ef7ff2f120e 26 * pwm.setInterrupts(DTPWM_SI0 | DTPWM_SI5); //to set MR0 & MR5 interrupts
dontknowhow 2:1ef7ff2f120e 27 */
dontknowhow 2:1ef7ff2f120e 28 #define DTPWM_SI0 (1 << 0U)
dontknowhow 2:1ef7ff2f120e 29 #define DTPWM_SI1 (1 << 3U)
dontknowhow 2:1ef7ff2f120e 30 #define DTPWM_SI2 (1 << 6U)
dontknowhow 2:1ef7ff2f120e 31 #define DTPWM_SI3 (1 << 9U)
dontknowhow 2:1ef7ff2f120e 32 #define DTPWM_SI4 (1 << 12U)
dontknowhow 2:1ef7ff2f120e 33 #define DTPWM_SI5 (1 << 15U)
dontknowhow 2:1ef7ff2f120e 34 #define DTPWM_SI6 (1 << 18U)
dontknowhow 2:1ef7ff2f120e 35
dontknowhow 2:1ef7ff2f120e 36 #define DTPWM_SIA (DTPWM_SI0 | DTPWM_SI1 | DTPWM_SI2 | DTPWM_SI3 | DTPWM_SI4 | DTPWM_SI5 | DTPWM_SI6)
dontknowhow 2:1ef7ff2f120e 37
dontknowhow 0:f4cf8380dbee 38 class DtPWM{
dontknowhow 0:f4cf8380dbee 39 public:
dontknowhow 0:f4cf8380dbee 40 /**
dontknowhow 0:f4cf8380dbee 41 * Create a dtPWM object connected to channel 2 and 4, optionally to LED 2&4
dontknowhow 0:f4cf8380dbee 42 *
dontknowhow 3:d7b9697768d8 43 * @param ebaled - start pwm enabled, output as soon as object is created (default)
dontknowhow 0:f4cf8380dbee 44 */
dontknowhow 3:d7b9697768d8 45 DtPWM(bool enable = true);
dontknowhow 2:1ef7ff2f120e 46
dontknowhow 2:1ef7ff2f120e 47 /**
dontknowhow 2:1ef7ff2f120e 48 * enable pin outputs and start the timer
dontknowhow 3:d7b9697768d8 49 *
dontknowhow 3:d7b9697768d8 50 * @channel - determines which channels are enabled.
dontknowhow 3:d7b9697768d8 51 * 'h' for high (PWM1.2)
dontknowhow 3:d7b9697768d8 52 * 'l' for low (PWM1.4)
dontknowhow 3:d7b9697768d8 53 * 'a' for both (PWM1.2 & 1.4) (default)
dontknowhow 2:1ef7ff2f120e 54 */
dontknowhow 3:d7b9697768d8 55 void enable(char channel = 'a');
dontknowhow 2:1ef7ff2f120e 56
dontknowhow 2:1ef7ff2f120e 57 /**
dontknowhow 2:1ef7ff2f120e 58 * set output pins to low as fast as possible and stop the timer
dontknowhow 2:1ef7ff2f120e 59 */
dontknowhow 2:1ef7ff2f120e 60 void disable();
dontknowhow 2:1ef7ff2f120e 61
dontknowhow 0:f4cf8380dbee 62 /**
dontknowhow 0:f4cf8380dbee 63 * Set the period, duty cycle, and dead time.
dontknowhow 0:f4cf8380dbee 64 *
dontknowhow 0:f4cf8380dbee 65 * @param p_us - period in micro seconds
dontknowhow 0:f4cf8380dbee 66 * @param d - duty cycle from 0-1 as float
dontknowhow 0:f4cf8380dbee 67 * @param dt_us - dead time between switching in micro seconds
dontknowhow 0:f4cf8380dbee 68 */
dontknowhow 0:f4cf8380dbee 69 void setDtPWM(double p_us, float d, double dt_us);
dontknowhow 0:f4cf8380dbee 70
dontknowhow 0:f4cf8380dbee 71 /**
dontknowhow 2:1ef7ff2f120e 72 * Set which interrupts are enabled
dontknowhow 2:1ef7ff2f120e 73 *
dontknowhow 2:1ef7ff2f120e 74 * @param flags - OR'd bits for the interrupt register, 0 to disable interrupts
dontknowhow 2:1ef7ff2f120e 75 * use the definitions eg. pwm.setInterrupts(DTPWM_SI0 | DTPWM_SI5); to set MR0 & MR5
dontknowhow 2:1ef7ff2f120e 76 * @param priority - set interrupt priority level. -1 (default) leaves them unchanged
dontknowhow 2:1ef7ff2f120e 77 */
dontknowhow 2:1ef7ff2f120e 78 void setInterrupts(uint32_t flags, int prio = -1);
dontknowhow 2:1ef7ff2f120e 79
dontknowhow 2:1ef7ff2f120e 80 /**
dontknowhow 0:f4cf8380dbee 81 * Value for maximum duty cycle that fulfils minimum dead times
dontknowhow 0:f4cf8380dbee 82 */
dontknowhow 0:f4cf8380dbee 83 float d_max;
dontknowhow 0:f4cf8380dbee 84
dontknowhow 0:f4cf8380dbee 85 /**
dontknowhow 2:1ef7ff2f120e 86 * Function to just set the duty cycle.
dontknowhow 0:f4cf8380dbee 87 *
dontknowhow 0:f4cf8380dbee 88 * @param d - duty cycle from 0-1 as float no checking is done in this function
dontknowhow 0:f4cf8380dbee 89 */
dontknowhow 0:f4cf8380dbee 90 void setD(float d);
dontknowhow 0:f4cf8380dbee 91
dontknowhow 0:f4cf8380dbee 92 private:
dontknowhow 0:f4cf8380dbee 93 unsigned int p_tcks; // clock ticks in period
dontknowhow 0:f4cf8380dbee 94 unsigned int dt_tcks; // dead time ticks
dontknowhow 0:f4cf8380dbee 95 };
dontknowhow 0:f4cf8380dbee 96 #endif