diff options
Diffstat (limited to 'src/stm/ao_sample_profile_timer.c')
| -rw-r--r-- | src/stm/ao_sample_profile_timer.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/stm/ao_sample_profile_timer.c b/src/stm/ao_sample_profile_timer.c new file mode 100644 index 00000000..d5af3a57 --- /dev/null +++ b/src/stm/ao_sample_profile_timer.c @@ -0,0 +1,115 @@ +/* + * Copyright © 2012 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; version 2 of the License. + * + * 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> +#include <ao_sample_profile.h> + +struct stm_exception { + uint32_t r0; + uint32_t r1; + uint32_t r2; + uint32_t r3; + uint32_t r12; + uint32_t lr; + uint32_t pc; + uint32_t psr; +}; + +void +stm_tim10_isr(void) +{ + struct stm_exception *ex; + + asm("mov %0,sp" : "=&r" (ex)); + + stm_tim10.sr = 0; + ao_sample_profile_point(ex->pc, stm_tim11.cnt, (ex->psr & 0xff) != 0); +} + +uint16_t +ao_sample_profile_timer_start(void) +{ + /* Reset counts */ + stm_tim11.cnt = 0; + stm_tim10.cnt = 0; + + /* Turn on timer 11 */ + stm_tim11.cr1 = ((0 << STM_TIM1011_CR1_CKD) | + (0 << STM_TIM1011_CR1_ARPE) | + (1 << STM_TIM1011_CR1_URS) | + (0 << STM_TIM1011_CR1_UDIS) | + (1 << STM_TIM1011_CR1_CEN)); + + /* Turn on timer 10 */ + stm_tim10.cr1 = ((0 << STM_TIM1011_CR1_CKD) | + (0 << STM_TIM1011_CR1_ARPE) | + (1 << STM_TIM1011_CR1_URS) | + (0 << STM_TIM1011_CR1_UDIS) | + (1 << STM_TIM1011_CR1_CEN)); + return stm_tim11.cnt; +} + +void +ao_sample_profile_timer_stop(void) +{ + stm_tim10.cr1 = 0; + stm_tim11.cr1 = 0; +} + +#if AO_APB2_PRESCALER > 1 +#define TIMER_91011_SCALER 2 +#else +#define TIMER_91011_SCALER 1 +#endif + +#define TIMER_10kHz ((AO_PCLK2 * TIMER_91011_SCALER) / 10000) +#define TIMER_1kHz ((AO_PCLK2 * TIMER_91011_SCALER) / 1000) + +void +ao_sample_profile_timer_init(void) +{ + /* Turn on power for timer 10 and 11 */ + stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_TIM10EN) | (1 << STM_RCC_APB2ENR_TIM11EN); + + /* Timer 10 is the 1kHz interrupt */ + stm_tim10.cr1 = 0; + stm_tim10.psc = TIMER_10kHz; + stm_tim10.arr = 9; + stm_tim10.cnt = 0; + + /* Enable timer 10 update interrupt */ + stm_tim10.dier = (1 << STM_TIM1011_DIER_UIE); + + /* Poke timer to reload values */ + stm_tim10.egr |= (1 << STM_TIM1011_EGR_UG); + + /* Timer 11 is the 1kHz counter */ + stm_tim11.cr1 = 0; + stm_tim11.psc = TIMER_1kHz; + stm_tim11.arr = 0xffff; + stm_tim11.cnt = 0; + + /* Disable interrupts for timer 11 */ + stm_tim11.dier = 0; + + /* Poke timer to reload values */ + stm_tim11.egr |= (1 << STM_TIM1011_EGR_UG); + + stm_tim10.sr = 0; + stm_nvic_set_enable(STM_ISR_TIM10_POS); + stm_nvic_set_priority(STM_ISR_TIM10_POS, AO_STM_NVIC_HIGH_PRIORITY); +} |