2 * Copyright © 2012 Keith Packard <keithp@keithp.com>
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.
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.
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.
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
34 #error BEEPER_TIMER must be 2, 3 or 4
42 stm_rcc.apb1enr &= ~(1 << RCC_BEEPER);
44 stm_rcc.apb1enr |= (1 << RCC_BEEPER);
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));
50 /* Set prescaler to match cc1111 clocks
52 stm_beeper.psc = AO_TIM23467_CLK / 750000;
54 /* 1. Select the counter clock (internal, external, prescaler).
56 * Setting SMCR to zero means use the internal clock
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;
72 #error invalid BEEPER_CHANNEL
75 /* 3. Set the CCxIE and/or CCxDE bits if an interrupt and/or a
76 * DMA request is to be generated.
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.
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)
91 #define CCER(n) (BEEPER_CHANNEL == (n) ? 1 : 0)
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) |
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) |
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));
118 #error invalid BEEPER_CHANNEL
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));
133 /* 5. Enable the counter by setting the CEN bit in the TIMx_CR1 register. */
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));
144 /* Update the values */
145 stm_beeper.egr = (1 << STM_TIM234_EGR_UG);
150 ao_beep_for(uint8_t beep, uint16_t ticks)
160 ao_enable_port(BEEPER_PORT);
161 stm_afr_set(BEEPER_PORT, BEEPER_PIN, BEEPER_AFR);
163 /* Leave the timer off until requested */
164 stm_rcc.apb1enr &= ~(1 << RCC_BEEPER);