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   1 /*
   2  * Copyright © 2013 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 #define _cat2(a,b) a##b
  22 #define cat2(a,b) _cat2(a,b)
  23 #define _cat4(a,b,c,d) a##b##c##d
  24 #define cat4(a,b,c,d) _cat4(a,b,c,d)
  25 #define _cat8(a,b,c,d,e,f,g,h) a##b##c##d##e##f##g##h
  26 #define cat8(a,b,c,d,e,f,g,h) _cat8(a,b,c,d,e,f,g,h)
  27
  28 #ifndef AO_LPC_BEEP_TIMER
  29 #define AO_LPC_BEEP_TIMER 1
  30 #define AO_LPC_BEEP_CHANNEL 1
  31 #define AO_LPC_BEEP_PORT        0
  32 #define AO_LPC_BEEP_PIN         14
  33 #endif
  34
  35 #define AO_LPC_CT_BEEP          cat2(lpc_ct32b, AO_LPC_BEEP_TIMER)
  36 #define AO_LPC_CT_BEEP_CLKCTRL  cat2(LPC_SCB_SYSAHBCLKCTRL_CT32B, AO_LPC_BEEP_TIMER)
  37 #define AO_LPC_CT_BEEP_EMR      cat2(LPC_CT32B_EMR_EMC, AO_LPC_BEEP_CHANNEL)
  38 #define AO_LPC_CT_BEEP_MR       AO_LPC_BEEP_CHANNEL
  39 #define AO_LPC_CT_BEEP_PWMC     cat2(LPC_CT32B_PWMC_PWMEN, AO_LPC_BEEP_CHANNEL)
  40 #define AO_LPC_CT_BEEP_IOCONF   cat4(pio,AO_LPC_BEEP_PORT,_,AO_LPC_BEEP_PIN)
  41 #define AO_LPC_CT_BEEP_FUNC     cat8(LPC_IOCONF_FUNC_PIO,AO_LPC_BEEP_PORT,_,AO_LPC_BEEP_PIN,_CT32B,AO_LPC_BEEP_TIMER,_MAT,AO_LPC_BEEP_CHANNEL)
  42
  43 void
  44 ao_beep(uint8_t beep)
  45 {
  46         if (beep == 0) {
  47                 AO_LPC_CT_BEEP.tcr = ((0 << LPC_CT32B_TCR_CEN) |
  48                                   (1 << LPC_CT32B_TCR_CRST));
  49                 lpc_scb.sysahbclkctrl &= ~(1UL << AO_LPC_CT_BEEP_CLKCTRL);
  50         } else {
  51                 lpc_scb.sysahbclkctrl |= (1UL << AO_LPC_CT_BEEP_CLKCTRL);
  52
  53                 /* Set prescaler to match cc1111 clocks
  54                  */
  55                 AO_LPC_CT_BEEP.pr = AO_LPC_SYSCLK / 750000 - 1;
  56
  57                 /* Write the desired data in the match registers */
  58
  59                 /* Reset after two time units */
  60                 AO_LPC_CT_BEEP.mr[0] = beep << 1;
  61
  62                 /* PWM width is half of that */
  63                 AO_LPC_CT_BEEP.mr[AO_LPC_CT_BEEP_MR] = beep;
  64
  65                 /* Flip output on PWM match */
  66                 AO_LPC_CT_BEEP.emr = (LPC_CT32B_EMR_EMC_TOGGLE << AO_LPC_CT_BEEP_EMR);
  67
  68                 /* Reset on match 0 */
  69                 AO_LPC_CT_BEEP.mcr = (1 << LPC_CT32B_MCR_MR0R);
  70
  71                 /* PWM on match */
  72                 AO_LPC_CT_BEEP.pwmc = (1 << AO_LPC_CT_BEEP_PWMC);
  73
  74                 /* timer mode */
  75                 AO_LPC_CT_BEEP.ctcr = 0;
  76
  77                 /* And turn the timer on */
  78                 AO_LPC_CT_BEEP.tcr = ((1 << LPC_CT32B_TCR_CEN) |
  79                                   (0 << LPC_CT32B_TCR_CRST));
  80         }
  81 }
  82
  83 void
  84 ao_beep_for(uint8_t beep, AO_TICK_TYPE ticks)
  85 {
  86         ao_beep(beep);
  87         ao_delay(ticks);
  88         ao_beep(0);
  89 }
  90
  91 void
  92 ao_beep_init(void)
  93 {
  94         /* Our beeper is on c32b1_mat1
  95          * which is on pin pio0_14
  96          */
  97
  98         lpc_ioconf.AO_LPC_CT_BEEP_IOCONF = ((AO_LPC_CT_BEEP_FUNC << LPC_IOCONF_FUNC) |
  99                               (LPC_IOCONF_MODE_INACTIVE << LPC_IOCONF_MODE) |
 100                               (0 << LPC_IOCONF_HYS) |
 101                               (0 << LPC_IOCONF_INV) |
 102                               (1 << LPC_IOCONF_ADMODE) |
 103                               (0 << LPC_IOCONF_OD));
 104
 105         lpc_scb.sysahbclkctrl |= (1 << AO_LPC_CT_BEEP_CLKCTRL);
 106
 107         /* Disable the counter and reset the value */
 108         AO_LPC_CT_BEEP.tcr = ((0 << LPC_CT32B_TCR_CEN) |
 109                           (1 << LPC_CT32B_TCR_CRST));
 110 }