diff options
Diffstat (limited to 'ao_beep.c')
| -rw-r--r-- | ao_beep.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/ao_beep.c b/ao_beep.c new file mode 100644 index 00000000..ae5e36a6 --- /dev/null +++ b/ao_beep.c @@ -0,0 +1,53 @@ +/* + * Copyright © 2009 Keith Packard <keithp@keithp.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include "ao.h" + +void +ao_beep_init(void) +{ + /* Our beeper is on P2_0, which is hooked to timer 4 using + * configuration alternative 2 + */ + P2_0 = 0; + P2SEL = (P2SEL & ~P2SEL_SELP2_0_MASK) | P2SEL_SELP2_0_GPIO; + PERCFG = (PERCFG & ~PERCFG_T4CFG_ALT_MASK) | PERCFG_T4CFG_ALT_2; + T4CCTL0 = TxCCTLy_CMP_TOGGLE|TxCCTLy_CMP_MODE_ENABLE; +} + +void +ao_beep(uint8_t beep) +{ + if (beep == 0) { + P2_0 = 0; + P2SEL = (P2SEL & ~P2SEL_SELP2_0_MASK) | P2SEL_SELP2_0_GPIO; + T4CTL = 0; + } else { + P2SEL = (P2SEL & ~P2SEL_SELP2_0_MASK) | P2SEL_SELP2_0_PERIPHERAL; + T4CC0 = beep; + T4CTL = TxCTL_DIV_32 | TxCTL_MODE_MODULO | TxCTL_START; + } +} + +void +ao_beep_for(uint8_t beep, uint16_t ticks) +{ + ao_beep(beep); + ao_delay(ticks); + ao_beep(0); +} |