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Fork of FastPWM by
Device/FastPWM_LPC11XX.cpp@23:ed690a19dc55, 2015-04-19 (annotated)
- Committer:
- Sissors
- Date:
- Sun Apr 19 19:35:50 2015 +0000
- Revision:
- 23:ed690a19dc55
- Parent:
- Device/FastPWM_LPC11U24.cpp@12:4600daab8a83
Added LPC11XX_LPC11cXX support (LPC1114). Should work. Probably.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Sissors | 23:ed690a19dc55 | 1 | #if defined(TARGET_LPC11UXX) || defined(TARGET_LPC11XX_11CXX) |
Sissors | 4:a7b9f778c4b4 | 2 | |
Sissors | 4:a7b9f778c4b4 | 3 | #include "FastPWM.h" |
Sissors | 4:a7b9f778c4b4 | 4 | |
Sissors | 12:4600daab8a83 | 5 | #define PWM_MR (*(((fastpwm_struct*)fast_obj)->MR)) |
Sissors | 12:4600daab8a83 | 6 | #define PWM_TIMER (((fastpwm_struct*)fast_obj)->timer) |
Sissors | 12:4600daab8a83 | 7 | |
Sissors | 23:ed690a19dc55 | 8 | typedef struct { |
Sissors | 23:ed690a19dc55 | 9 | uint8_t timer; |
Sissors | 23:ed690a19dc55 | 10 | uint8_t mr; |
Sissors | 23:ed690a19dc55 | 11 | } timer_mr; |
Sissors | 23:ed690a19dc55 | 12 | |
Sissors | 23:ed690a19dc55 | 13 | #ifdef TARGET_LPC11UXX |
Sissors | 12:4600daab8a83 | 14 | typedef struct { |
Sissors | 12:4600daab8a83 | 15 | __IO uint32_t *MR; |
Sissors | 12:4600daab8a83 | 16 | LPC_CTxxBx_Type *timer; |
Sissors | 12:4600daab8a83 | 17 | } fastpwm_struct; |
Sissors | 12:4600daab8a83 | 18 | |
Sissors | 4:a7b9f778c4b4 | 19 | static timer_mr pwm_timer_map[11] = { |
Sissors | 4:a7b9f778c4b4 | 20 | {0, 0}, {0, 1}, {0, 2}, |
Sissors | 4:a7b9f778c4b4 | 21 | {1, 0}, {1, 1}, |
Sissors | 4:a7b9f778c4b4 | 22 | {2, 0}, {2, 1}, {2, 2}, |
Sissors | 4:a7b9f778c4b4 | 23 | {3, 0}, {3, 1}, {3, 2}, |
Sissors | 4:a7b9f778c4b4 | 24 | }; |
Sissors | 23:ed690a19dc55 | 25 | |
Sissors | 4:a7b9f778c4b4 | 26 | static LPC_CTxxBx_Type *Timers[4] = { |
Sissors | 4:a7b9f778c4b4 | 27 | LPC_CT16B0, LPC_CT16B1, |
Sissors | 4:a7b9f778c4b4 | 28 | LPC_CT32B0, LPC_CT32B1 |
Sissors | 4:a7b9f778c4b4 | 29 | }; |
Sissors | 23:ed690a19dc55 | 30 | #else //LPC11XX |
Sissors | 23:ed690a19dc55 | 31 | typedef struct { |
Sissors | 23:ed690a19dc55 | 32 | __IO uint32_t *MR; |
Sissors | 23:ed690a19dc55 | 33 | LPC_TMR_TypeDef *timer; |
Sissors | 23:ed690a19dc55 | 34 | } fastpwm_struct; |
Sissors | 23:ed690a19dc55 | 35 | |
Sissors | 23:ed690a19dc55 | 36 | static timer_mr pwm_timer_map[5] = { |
Sissors | 23:ed690a19dc55 | 37 | {0, 0}, /* CT16B0, MR0 */ |
Sissors | 23:ed690a19dc55 | 38 | {0, 1}, /* CT16B0, MR1 */ |
Sissors | 23:ed690a19dc55 | 39 | |
Sissors | 23:ed690a19dc55 | 40 | {1, 0}, /* CT16B1, MR0 */ |
Sissors | 23:ed690a19dc55 | 41 | {1, 1}, /* CT16B1, MR1 */ |
Sissors | 23:ed690a19dc55 | 42 | |
Sissors | 23:ed690a19dc55 | 43 | {2, 2}, /* CT32B0, MR2 */ |
Sissors | 23:ed690a19dc55 | 44 | }; |
Sissors | 23:ed690a19dc55 | 45 | |
Sissors | 23:ed690a19dc55 | 46 | static LPC_TMR_TypeDef *Timers[3] = { |
Sissors | 23:ed690a19dc55 | 47 | LPC_TMR16B0, LPC_TMR16B1, |
Sissors | 23:ed690a19dc55 | 48 | LPC_TMR32B0 |
Sissors | 23:ed690a19dc55 | 49 | }; |
Sissors | 23:ed690a19dc55 | 50 | #endif |
Sissors | 4:a7b9f778c4b4 | 51 | |
Sissors | 4:a7b9f778c4b4 | 52 | |
Sissors | 4:a7b9f778c4b4 | 53 | void FastPWM::initFastPWM( void ) { |
Sissors | 12:4600daab8a83 | 54 | fast_obj = new fastpwm_struct; |
Sissors | 12:4600daab8a83 | 55 | timer_mr tid = pwm_timer_map[_pwm.pwm]; |
Sissors | 12:4600daab8a83 | 56 | PWM_TIMER = Timers[tid.timer]; |
Sissors | 12:4600daab8a83 | 57 | (((fastpwm_struct*)fast_obj)->MR) = &PWM_TIMER->MR[tid.mr]; |
Sissors | 4:a7b9f778c4b4 | 58 | |
Sissors | 4:a7b9f778c4b4 | 59 | if (tid.timer < 2) |
Sissors | 4:a7b9f778c4b4 | 60 | //16-bit timer |
Sissors | 4:a7b9f778c4b4 | 61 | bits = 16; |
Sissors | 4:a7b9f778c4b4 | 62 | else |
Sissors | 4:a7b9f778c4b4 | 63 | //32-bit timer |
Sissors | 7:1b5df740bcd7 | 64 | bits = 32; |
Sissors | 4:a7b9f778c4b4 | 65 | } |
Sissors | 4:a7b9f778c4b4 | 66 | |
Sissors | 4:a7b9f778c4b4 | 67 | void FastPWM::pulsewidth_ticks( uint32_t ticks ) { |
Sissors | 7:1b5df740bcd7 | 68 | if (ticks) |
Sissors | 12:4600daab8a83 | 69 | PWM_MR = PWM_TIMER->MR3 - ticks; //They inverted PWM on the 11u24 |
Sissors | 7:1b5df740bcd7 | 70 | else |
Sissors | 12:4600daab8a83 | 71 | PWM_MR = 0xFFFFFFFF; //If MR3 = ticks 1 clock cycle wide errors appear, this prevents that (unless MR3 = max). |
Sissors | 4:a7b9f778c4b4 | 72 | } |
Sissors | 4:a7b9f778c4b4 | 73 | |
Sissors | 12:4600daab8a83 | 74 | void FastPWM::period_ticks( uint32_t ticks ) { |
Sissors | 12:4600daab8a83 | 75 | PWM_TIMER->TCR = 0x02; |
Sissors | 12:4600daab8a83 | 76 | PWM_TIMER->MR3 = ticks; |
Sissors | 12:4600daab8a83 | 77 | PWM_TIMER->TCR = 0x01; |
Sissors | 4:a7b9f778c4b4 | 78 | } |
Sissors | 4:a7b9f778c4b4 | 79 | |
Sissors | 4:a7b9f778c4b4 | 80 | uint32_t FastPWM::getPeriod( void ) { |
Sissors | 12:4600daab8a83 | 81 | return PWM_TIMER->MR3; |
Sissors | 4:a7b9f778c4b4 | 82 | } |
Sissors | 4:a7b9f778c4b4 | 83 | |
Sissors | 4:a7b9f778c4b4 | 84 | uint32_t FastPWM::setPrescaler(uint32_t reqScale) { |
Sissors | 4:a7b9f778c4b4 | 85 | //If 32-bit, disable auto-scaling, return 1 |
Sissors | 4:a7b9f778c4b4 | 86 | if (bits == 32) { |
Sissors | 4:a7b9f778c4b4 | 87 | dynamicPrescaler = false; |
Sissors | 4:a7b9f778c4b4 | 88 | return 1; |
Sissors | 4:a7b9f778c4b4 | 89 | } |
Sissors | 4:a7b9f778c4b4 | 90 | |
Sissors | 4:a7b9f778c4b4 | 91 | //Else 16-bit timer: |
Sissors | 4:a7b9f778c4b4 | 92 | if (reqScale == 0) |
Sissors | 4:a7b9f778c4b4 | 93 | //Return prescaler |
Sissors | 12:4600daab8a83 | 94 | return PWM_TIMER->PR + 1; |
Sissors | 4:a7b9f778c4b4 | 95 | if (reqScale > (uint32_t)(1<<16)) |
Sissors | 4:a7b9f778c4b4 | 96 | reqScale = 1<<16; |
Sissors | 4:a7b9f778c4b4 | 97 | //Else set prescaler, we have to substract one from reqScale since a 0 in PCVAL is prescaler of 1 |
Sissors | 12:4600daab8a83 | 98 | PWM_TIMER->PR = reqScale - 1; |
Sissors | 4:a7b9f778c4b4 | 99 | |
Sissors | 4:a7b9f778c4b4 | 100 | return reqScale; |
Sissors | 4:a7b9f778c4b4 | 101 | } |
Sissors | 4:a7b9f778c4b4 | 102 | |
Sissors | 4:a7b9f778c4b4 | 103 | #endif |