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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 #include "ao_beep.h"
  21
  22 #if BEEPER_TIMER == 2
  23 #define stm_beeper      stm_tim2
  24 #define RCC_BEEPER      STM_RCC_APB1ENR_TIM2EN
  25 #elif BEEPER_TIMER == 3
  26 #define stm_beeper      stm_tim3
  27 #define RCC_BEEPER      STM_RCC_APB1ENR_TIM3EN
  28 #elif BEEPER_TIMER == 4
  29 #define stm_beeper      stm_tim4
  30 #define RCC_BEEPER      STM_RCC_APB1ENR_TIM4EN
  31 #else
  32 #error BEEPER_TIMER must be 2, 3 or 4
  33 #endif
  34
  35 void
  36 ao_beep(uint8_t beep)
  37 {
  38         if (beep == 0) {
  39                 stm_beeper.cr1 = 0;
  40                 stm_rcc.apb1enr &= ~(1UL << RCC_BEEPER);
  41         } else {
  42                 stm_rcc.apb1enr |= (1UL << RCC_BEEPER);
  43
  44                 stm_beeper.cr2 = ((0 << STM_TIM234_CR2_TI1S) |
  45                                 (STM_TIM234_CR2_MMS_RESET << STM_TIM234_CR2_MMS) |
  46                                 (0 << STM_TIM234_CR2_CCDS));
  47
  48                 /* Set prescaler to match cc1111 clocks
  49                  */
  50                 stm_beeper.psc = AO_TIM23467_CLK / 750000;
  51
  52                 /* 1. Select the counter clock (internal, external, prescaler).
  53                  *
  54                  * Setting SMCR to zero means use the internal clock
  55                  */
  56
  57                 stm_beeper.smcr = 0;
  58
  59                 /* 2. Write the desired data in the TIMx_ARR and TIMx_CCRx registers. */
  60                 stm_beeper.arr = beep;
  61 #if BEEPER_CHANNEL == 1
  62                 stm_beeper.ccr1 = beep;
  63 #elif BEEPER_CHANNEL == 2
  64                 stm_beeper.ccr2 = beep;
  65 #elif BEEPER_CHANNEL == 3
  66                 stm_beeper.ccr3 = beep;
  67 #elif BEEPER_CHANNEL == 4
  68                 stm_beeper.ccr4 = beep;
  69 #else
  70 #error invalid BEEPER_CHANNEL
  71 #endif
  72
  73                 /* 3. Set the CCxIE and/or CCxDE bits if an interrupt and/or a
  74                  * DMA request is to be generated.
  75                  */
  76                 /* don't want this */
  77
  78                 /* 4. Select the output mode. For example, you must write
  79                  *  OCxM=011, OCxPE=0, CCxP=0 and CCxE=1 to toggle OCx output
  80                  *  pin when CNT matches CCRx, CCRx preload is not used, OCx
  81                  *  is enabled and active high.
  82                  */
  83
  84 #define OC1M    (BEEPER_CHANNEL == 1 ? STM_TIM234_CCMR1_OC1M_TOGGLE : STM_TIM234_CCMR1_OC1M_FROZEN)
  85 #define OC2M    (BEEPER_CHANNEL == 2 ? STM_TIM234_CCMR1_OC2M_TOGGLE : STM_TIM234_CCMR1_OC2M_FROZEN)
  86 #define OC3M    (BEEPER_CHANNEL == 3 ? STM_TIM234_CCMR2_OC3M_TOGGLE : STM_TIM234_CCMR2_OC3M_FROZEN)
  87 #define OC4M    (BEEPER_CHANNEL == 4 ? STM_TIM234_CCMR2_OC4M_TOGGLE : STM_TIM234_CCMR2_OC4M_FROZEN)
  88
  89 #define CCER(n) (BEEPER_CHANNEL == (n) ? 1 : 0)
  90
  91 #if BEEPER_CHANNEL == 1 || BEEPER_CHANNEL == 2
  92                 stm_beeper.ccmr1 = ((0 << STM_TIM234_CCMR1_OC2CE) |
  93                                     (OC2M << STM_TIM234_CCMR1_OC2M) |
  94                                     (0 << STM_TIM234_CCMR1_OC2PE) |
  95                                     (0 << STM_TIM234_CCMR1_OC2FE) |
  96                                     (STM_TIM234_CCMR1_CC2S_OUTPUT << STM_TIM234_CCMR1_CC2S) |
  97
  98                                     (0 << STM_TIM234_CCMR1_OC1CE) |
  99                                     (OC1M << STM_TIM234_CCMR1_OC1M) |
 100                                     (0 << STM_TIM234_CCMR1_OC1PE) |
 101                                     (0 << STM_TIM234_CCMR1_OC1FE) |
 102                                     (STM_TIM234_CCMR1_CC1S_OUTPUT << STM_TIM234_CCMR1_CC1S));
 103 #elif BEEPER_CHANNEL == 3 || BEEPER_CHANNEL == 4
 104                 stm_beeper.ccmr2 = ((0 << STM_TIM234_CCMR2_OC4CE) |
 105                                     (OC4M << STM_TIM234_CCMR2_OC4M) |
 106                                     (0 << STM_TIM234_CCMR2_OC4PE) |
 107                                     (0 << STM_TIM234_CCMR2_OC4FE) |
 108                                     (STM_TIM234_CCMR2_CC4S_OUTPUT << STM_TIM234_CCMR2_CC4S) |
 109
 110                                     (0 << STM_TIM234_CCMR2_OC3CE) |
 111                                     (OC3M << STM_TIM234_CCMR2_OC3M) |
 112                                     (0 << STM_TIM234_CCMR2_OC3PE) |
 113                                     (0 << STM_TIM234_CCMR2_OC3FE) |
 114                                     (STM_TIM234_CCMR2_CC3S_OUTPUT << STM_TIM234_CCMR2_CC3S));
 115 #else
 116 #error invalid BEEPER_CHANNEL
 117 #endif
 118                 stm_beeper.ccer = ((0 << STM_TIM234_CCER_CC4NP) |
 119                                    (0 << STM_TIM234_CCER_CC4P) |
 120                                    (CCER(4) << STM_TIM234_CCER_CC4E) |
 121                                    (0 << STM_TIM234_CCER_CC3NP) |
 122                                    (0 << STM_TIM234_CCER_CC3P) |
 123                                    (CCER(3) << STM_TIM234_CCER_CC3E) |
 124                                    (0 << STM_TIM234_CCER_CC2NP) |
 125                                    (0 << STM_TIM234_CCER_CC2P) |
 126                                    (CCER(2) << STM_TIM234_CCER_CC2E) |
 127                                    (0 << STM_TIM234_CCER_CC1NP) |
 128                                    (0 << STM_TIM234_CCER_CC1P) |
 129                                    (CCER(1) << STM_TIM234_CCER_CC1E));
 130
 131                 /* 5. Enable the counter by setting the CEN bit in the TIMx_CR1 register. */
 132
 133                 stm_beeper.cr1 = ((STM_TIM234_CR1_CKD_1 << STM_TIM234_CR1_CKD) |
 134                                 (0 << STM_TIM234_CR1_ARPE) |
 135                                 (STM_TIM234_CR1_CMS_EDGE << STM_TIM234_CR1_CMS) |
 136                                 (0 << STM_TIM234_CR1_DIR) |
 137                                 (0 << STM_TIM234_CR1_OPM) |
 138                                 (0 << STM_TIM234_CR1_URS) |
 139                                 (0 << STM_TIM234_CR1_UDIS) |
 140                                 (1 << STM_TIM234_CR1_CEN));
 141
 142                 /* Update the values */
 143                 stm_beeper.egr = (1 << STM_TIM234_EGR_UG);
 144         }
 145 }
 146
 147 void
 148 ao_beep_for(uint8_t beep, AO_TICK_TYPE ticks)
 149 {
 150         ao_beep(beep);
 151         ao_delay(ticks);
 152         ao_beep(0);
 153 }
 154
 155 void
 156 ao_beep_init(void)
 157 {
 158         ao_enable_port(BEEPER_PORT);
 159 #if BEEPER_TIMER == 2
 160         if (BEEPER_PORT == &stm_gpioa) {
 161                 switch (BEEPER_PIN) {
 162                 case 0:
 163                 case 1:
 164                 case 2:
 165                 case 3:
 166                         stm_set_afio_mapr(STM_AFIO_MAPR_TIM2_REMAP,
 167                                           STM_AFIO_MAPR_TIM2_REMAP_PA0_PA1_PA2_PA3,
 168                                           STM_AFIO_MAPR_TIM2_REMAP_MASK);
 169                         break;
 170                 default:
 171                         ao_panic(AO_PANIC_CRASH);
 172                         break;
 173                 }
 174         }
 175 #elif BEEPER_TIMER == 3
 176         if (BEEPER_PORT == &stm_gpioa) {
 177                 switch (BEEPER_PIN) {
 178                 case 6:
 179                 case 7:
 180                         stm_set_afio_mapr(STM_AFIO_MAPR_TIM3_REMAP,
 181                                           STM_AFIO_MAPR_TIM3_REMAP_PA6_PA7_PB0_PB1,
 182                                           STM_AFIO_MAPR_TIM3_REMAP_MASK);
 183                         break;
 184                 default:
 185                         ao_panic(AO_PANIC_CRASH);
 186                         break;
 187                 }
 188         } else if (BEEPER_PORT == &stm_gpiob) {
 189                 switch (BEEPER_PIN) {
 190                 case 4:
 191                 case 5:
 192                 case 0:
 193                 case 1:
 194                         stm_set_afio_mapr(STM_AFIO_MAPR_TIM3_REMAP,
 195                                           STM_AFIO_MAPR_TIM3_REMAP_PB4_PB5_PB0_PB1,
 196                                           STM_AFIO_MAPR_TIM3_REMAP_MASK);
 197                         break;
 198                 default:
 199                         ao_panic(AO_PANIC_CRASH);
 200                         break;
 201                 }
 202         } else if (BEEPER_PORT == &stm_gpioc) {
 203                 switch (BEEPER_PIN) {
 204                 case 6:
 205                 case 7:
 206                 case 8:
 207                 case 9:
 208                         stm_set_afio_mapr(STM_AFIO_MAPR_TIM3_REMAP,
 209                                           STM_AFIO_MAPR_TIM3_REMAP_PC6_PC7_PC8_PC9,
 210                                           STM_AFIO_MAPR_TIM3_REMAP_MASK);
 211                         break;
 212                 default:
 213                         ao_panic(AO_PANIC_CRASH);
 214                         break;
 215                 }
 216         }
 217 #elif BEEPER_TIMER == 4
 218         ao_panic(AO_PANIC_CRASH);
 219 #endif
 220         stm_gpio_conf(BEEPER_PORT, BEEPER_PIN,
 221                       STM_GPIO_CR_MODE_OUTPUT_2MHZ,
 222                       STM_GPIO_CR_CNF_OUTPUT_AF_PUSH_PULL);
 223
 224         /* Leave the timer off until requested */
 225         stm_rcc.apb1enr &= ~(1UL << RCC_BEEPER);
 226 }