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   1 /*
   2  * Copyright © 2012 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #include "ao.h"
  20
  21 #if BEEPER_TIMER == 2
  22 #define stm_beeper      stm_tim2
  23 #define RCC_BEEPER      STM_RCC_APB1ENR_TIM2EN
  24 #define BEEPER_AFR      STM_AFR_AF1
  25 #elif BEEPER_TIMER == 3
  26 #define stm_beeper      stm_tim3
  27 #define RCC_BEEPER      STM_RCC_APB1ENR_TIM3EN
  28 #define BEEPER_AFR      STM_AFR_AF2
  29 #elif BEEPER_TIMER == 4
  30 #define stm_beeper      stm_tim4
  31 #define RCC_BEEPER      STM_RCC_APB1ENR_TIM4EN
  32 #define BEEPER_AFR      STM_AFR_AF2
  33 #else
  34 #error BEEPER_TIMER must be 2, 3 or 4
  35 #endif
  36
  37 void
  38 ao_beep(uint8_t beep)
  39 {
  40         if (beep == 0) {
  41                 stm_beeper.cr1 = 0;
  42                 stm_rcc.apb1enr &= ~(1 << RCC_BEEPER);
  43         } else {
  44                 stm_rcc.apb1enr |= (1 << RCC_BEEPER);
  45
  46                 stm_beeper.cr2 = ((0 << STM_TIM234_CR2_TI1S) |
  47                                 (STM_TIM234_CR2_MMS_RESET << STM_TIM234_CR2_MMS) |
  48                                 (0 << STM_TIM234_CR2_CCDS));
  49
  50                 /* Set prescaler to match cc1111 clocks
  51                  */
  52                 stm_beeper.psc = AO_TIM23467_CLK / 750000;
  53
  54                 /* 1. Select the counter clock (internal, external, prescaler).
  55                  *
  56                  * Setting SMCR to zero means use the internal clock
  57                  */
  58
  59                 stm_beeper.smcr = 0;
  60
  61                 /* 2. Write the desired data in the TIMx_ARR and TIMx_CCRx registers. */
  62                 stm_beeper.arr = beep;
  63 #if BEEPER_CHANNEL == 1
  64                 stm_beeper.ccr1 = beep;
  65 #elif BEEPER_CHANNEL == 2
  66                 stm_beeper.ccr2 = beep;
  67 #elif BEEPER_CHANNEL == 3
  68                 stm_beeper.ccr3 = beep;
  69 #elif BEEPER_CHANNEL == 4
  70                 stm_beeper.ccr4 = beep;
  71 #else
  72 #error invalid BEEPER_CHANNEL
  73 #endif
  74
  75                 /* 3. Set the CCxIE and/or CCxDE bits if an interrupt and/or a
  76                  * DMA request is to be generated.
  77                  */
  78                 /* don't want this */
  79
  80                 /* 4. Select the output mode. For example, you must write
  81                  *  OCxM=011, OCxPE=0, CCxP=0 and CCxE=1 to toggle OCx output
  82                  *  pin when CNT matches CCRx, CCRx preload is not used, OCx
  83                  *  is enabled and active high.
  84                  */
  85
  86 #define OC1M    (BEEPER_CHANNEL == 1 ? STM_TIM234_CCMR1_OC1M_TOGGLE : STM_TIM234_CCMR1_OC1M_FROZEN)
  87 #define OC2M    (BEEPER_CHANNEL == 2 ? STM_TIM234_CCMR1_OC2M_TOGGLE : STM_TIM234_CCMR1_OC2M_FROZEN)
  88 #define OC3M    (BEEPER_CHANNEL == 3 ? STM_TIM234_CCMR2_OC3M_TOGGLE : STM_TIM234_CCMR2_OC3M_FROZEN)
  89 #define OC4M    (BEEPER_CHANNEL == 4 ? STM_TIM234_CCMR2_OC4M_TOGGLE : STM_TIM234_CCMR2_OC4M_FROZEN)
  90
  91 #define CCER(n) (BEEPER_CHANNEL == (n) ? 1 : 0)
  92
  93 #if BEEPER_CHANNEL == 1 || BEEPER_CHANNEL == 2
  94                 stm_beeper.ccmr1 = ((0 << STM_TIM234_CCMR1_OC2CE) |
  95                                     (OC2M << STM_TIM234_CCMR1_OC2M) |
  96                                     (0 << STM_TIM234_CCMR1_OC2PE) |
  97                                     (0 << STM_TIM234_CCMR1_OC2FE) |
  98                                     (STM_TIM234_CCMR1_CC2S_OUTPUT << STM_TIM234_CCMR1_CC2S) |
  99
 100                                     (0 << STM_TIM234_CCMR1_OC1CE) |
 101                                     (OC1M << STM_TIM234_CCMR1_OC1M) |
 102                                     (0 << STM_TIM234_CCMR1_OC1PE) |
 103                                     (0 << STM_TIM234_CCMR1_OC1FE) |
 104                                     (STM_TIM234_CCMR1_CC1S_OUTPUT << STM_TIM234_CCMR1_CC1S));
 105 #elif BEEPER_CHANNEL == 3 || BEEPER_CHANNEL == 4
 106                 stm_beeper.ccmr2 = ((0 << STM_TIM234_CCMR2_OC4CE) |
 107                                     (OC4M << STM_TIM234_CCMR2_OC4M) |
 108                                     (0 << STM_TIM234_CCMR2_OC4PE) |
 109                                     (0 << STM_TIM234_CCMR2_OC4FE) |
 110                                     (STM_TIM234_CCMR2_CC4S_OUTPUT << STM_TIM234_CCMR2_CC4S) |
 111
 112                                     (0 << STM_TIM234_CCMR2_OC3CE) |
 113                                     (OC3M << STM_TIM234_CCMR2_OC3M) |
 114                                     (0 << STM_TIM234_CCMR2_OC3PE) |
 115                                     (0 << STM_TIM234_CCMR2_OC3FE) |
 116                                     (STM_TIM234_CCMR2_CC3S_OUTPUT << STM_TIM234_CCMR2_CC3S));
 117 #else
 118 #error invalid BEEPER_CHANNEL
 119 #endif
 120                 stm_beeper.ccer = ((0 << STM_TIM234_CCER_CC4NP) |
 121                                    (0 << STM_TIM234_CCER_CC4P) |
 122                                    (CCER(4) << STM_TIM234_CCER_CC4E) |
 123                                    (0 << STM_TIM234_CCER_CC3NP) |
 124                                    (0 << STM_TIM234_CCER_CC3P) |
 125                                    (CCER(3) << STM_TIM234_CCER_CC3E) |
 126                                    (0 << STM_TIM234_CCER_CC2NP) |
 127                                    (0 << STM_TIM234_CCER_CC2P) |
 128                                    (CCER(2) << STM_TIM234_CCER_CC2E) |
 129                                    (0 << STM_TIM234_CCER_CC1NP) |
 130                                    (0 << STM_TIM234_CCER_CC1P) |
 131                                    (CCER(1) << STM_TIM234_CCER_CC1E));
 132
 133                 /* 5. Enable the counter by setting the CEN bit in the TIMx_CR1 register. */
 134
 135                 stm_beeper.cr1 = ((STM_TIM234_CR1_CKD_1 << STM_TIM234_CR1_CKD) |
 136                                 (0 << STM_TIM234_CR1_ARPE) |
 137                                 (STM_TIM234_CR1_CMS_EDGE << STM_TIM234_CR1_CMS) |
 138                                 (0 << STM_TIM234_CR1_DIR) |
 139                                 (0 << STM_TIM234_CR1_OPM) |
 140                                 (0 << STM_TIM234_CR1_URS) |
 141                                 (0 << STM_TIM234_CR1_UDIS) |
 142                                 (1 << STM_TIM234_CR1_CEN));
 143
 144                 /* Update the values */
 145                 stm_beeper.egr = (1 << STM_TIM234_EGR_UG);
 146         }
 147 }
 148
 149 void
 150 ao_beep_for(uint8_t beep, uint16_t ticks)
 151 {
 152         ao_beep(beep);
 153         ao_delay(ticks);
 154         ao_beep(0);
 155 }
 156
 157 void
 158 ao_beep_init(void)
 159 {
 160         ao_enable_port(BEEPER_PORT);
 161         stm_afr_set(BEEPER_PORT, BEEPER_PIN, BEEPER_AFR);
 162
 163         /* Leave the timer off until requested */
 164         stm_rcc.apb1enr &= ~(1 << RCC_BEEPER);
 165 }