--- /dev/null
+/*
+ * 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_profile.h>
+
+static void ao_profile_test(void)
+{
+ uint8_t i;
+ uint32_t ticks[20];
+
+ for (i = 0; i < 20; i++) {
+ ticks[i] = ao_profile_tick();
+ ao_delay(0);
+ }
+ for (i = 0; i < 19; i++)
+ printf ("%d\n", ticks[i+1] - ticks[i]);
+}
+
+static const struct ao_cmds ao_profile_cmds[] = {
+ { ao_profile_test, "P\0Test profile counter" },
+ { 0, NULL }
+};
+
+void ao_profile_init(void)
+{
+ /* Turn on timer 2 and 4 */
+ stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_TIM2EN) |
+ (1 << STM_RCC_APB1ENR_TIM4EN);
+
+ /* disable timers */
+ stm_tim4.cr1 = 0;
+ stm_tim2.cr1 = 0;
+
+ /* tim4 is master */
+
+
+ stm_tim4.cr2 = ((0 << STM_TIM234_CR2_TI1S) |
+ (STM_TIM234_CR2_MMS_UPDATE << STM_TIM234_CR2_MMS) |
+ (0 << STM_TIM234_CR2_CCDS));
+
+ stm_tim4.smcr = ((0 << STM_TIM234_SMCR_ETP) |
+ (0 << STM_TIM234_SMCR_ECE) |
+ (STM_TIM234_SMCR_ETPS_OFF << STM_TIM234_SMCR_ETPS) |
+ (STM_TIM234_SMCR_ETF_NONE << STM_TIM234_SMCR_ETF) |
+ (0 << STM_TIM234_SMCR_MSM) |
+ (STM_TIM234_SMCR_TS_ITR3 << STM_TIM234_SMCR_TS) |
+ (0 << STM_TIM234_SMCR_OCCS) |
+ (STM_TIM234_SMCR_SMS_DISABLE << STM_TIM234_SMCR_SMS));
+
+ stm_tim4.dier = 0;
+ stm_tim4.sr = 0;
+
+ stm_tim4.psc = 31;
+ stm_tim4.cnt = 0;
+ stm_tim4.arr = 0xffff;
+
+ /* tim2 is slaved to tim4 */
+
+ stm_tim2.cr2 = ((0 << STM_TIM234_CR2_TI1S) |
+ (STM_TIM234_CR2_MMS_ENABLE << STM_TIM234_CR2_MMS) |
+ (0 << STM_TIM234_CR2_CCDS));
+ stm_tim2.smcr = ((0 << STM_TIM234_SMCR_ETP) |
+ (0 << STM_TIM234_SMCR_ECE) |
+ (STM_TIM234_SMCR_ETPS_OFF << STM_TIM234_SMCR_ETPS) |
+ (STM_TIM234_SMCR_ETF_NONE << STM_TIM234_SMCR_ETF) |
+ (0 << STM_TIM234_SMCR_MSM) |
+ (STM_TIM234_SMCR_TS_ITR3 << STM_TIM234_SMCR_TS) |
+ (0 << STM_TIM234_SMCR_OCCS) |
+ (STM_TIM234_SMCR_SMS_EXTERNAL_CLOCK << STM_TIM234_SMCR_SMS));
+ stm_tim2.dier = 0;
+ stm_tim2.sr = 0;
+ stm_tim2.psc = 0;
+ stm_tim2.cnt = 0;
+ stm_tim2.arr = 0xffff;
+
+ /* Start your timers */
+
+ stm_tim2.cr1 = ((STM_TIM234_CR1_CKD_1 << STM_TIM234_CR1_CKD) |
+ (0 << STM_TIM234_CR1_ARPE) |
+ (STM_TIM234_CR1_CMS_EDGE | STM_TIM234_CR1_CMS) |
+ (STM_TIM234_CR1_DIR_UP << STM_TIM234_CR1_DIR) |
+ (0 << STM_TIM234_CR1_OPM) |
+ (0 << STM_TIM234_CR1_URS) |
+ (0 << STM_TIM234_CR1_UDIS) |
+ (1 << STM_TIM234_CR1_CEN));
+
+ stm_tim4.cr1 = ((STM_TIM234_CR1_CKD_1 << STM_TIM234_CR1_CKD) |
+ (0 << STM_TIM234_CR1_ARPE) |
+ (STM_TIM234_CR1_CMS_EDGE | STM_TIM234_CR1_CMS) |
+ (STM_TIM234_CR1_DIR_UP << STM_TIM234_CR1_DIR) |
+ (0 << STM_TIM234_CR1_OPM) |
+ (1 << STM_TIM234_CR1_URS) |
+ (0 << STM_TIM234_CR1_UDIS) |
+ (1 << STM_TIM234_CR1_CEN));
+
+ ao_cmd_register(&ao_profile_cmds[0]);
+}