altos: add ao_time_ns API

[fw/altos] / src / stmf0 / ao_timer.c

diff --git a/src/stmf0/ao_timer.c b/src/stmf0/ao_timer.c
index e5bf04a3ccb8eecfe56593ad446b177d57fb2af6..58e52995cf32f35cbb4146b092f60e6217771972 100644 (file)
--- a/src/stmf0/ao_timer.c
+++ b/src/stmf0/ao_timer.c
@@ -3,7 +3,8 @@
  *
  * 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.
+ * 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
@@ -34,9 +35,25 @@ ao_time(void)
        return ao_tick_count;
 }
 
+uint64_t
+ao_time_ns(void)
+{
+       AO_TICK_TYPE    before, after;
+       uint32_t        cvr;
+
+       do {
+               before = ao_tick_count;
+               cvr = stm_systick.cvr;
+               after = ao_tick_count;
+       } while (before != after);
+
+       return (uint64_t) after * (1000000000ULL / AO_HERTZ) +
+               (uint64_t) cvr * (1000000000ULL / AO_SYSTICK);
+}
+
 #if AO_DATA_ALL
-volatile __data uint8_t        ao_data_interval = 1;
-volatile __data uint8_t        ao_data_count;
+volatile uint8_t       ao_data_interval = 1;
+volatile uint8_t       ao_data_count;
 #endif
 
 void stm_systick_isr(void)
@@ -85,6 +102,7 @@ ao_timer_set_adc_interval(uint8_t interval)
 void
 ao_timer_init(void)
 {
+       stm_systick.csr = 0;
        stm_systick.rvr = SYSTICK_RELOAD;
        stm_systick.cvr = 0;
        stm_systick.csr = ((1 << STM_SYSTICK_CSR_ENABLE) |
@@ -175,13 +193,12 @@ ao_clock_normal_start(void)
        while (!(stm_rcc.cr & (1 << STM_RCC_CR_HSERDY)))
                asm("nop");
 
-#ifdef STM_PLLSRC
        /* Disable the PLL */
        stm_rcc.cr &= ~(1 << STM_RCC_CR_PLLON);
        while (stm_rcc.cr & (1 << STM_RCC_CR_PLLRDY))
                asm("nop");
 
-       /* PLLVCO to 48MHz (for USB) -> PLLMUL = 3 */
+       /* Set multiplier */
        cfgr = stm_rcc.cfgr;
        cfgr &= ~(STM_RCC_CFGR_PLLMUL_MASK << STM_RCC_CFGR_PLLMUL);
        cfgr |= (AO_RCC_CFGR_PLLMUL << STM_RCC_CFGR_PLLMUL);
@@ -191,8 +208,8 @@ ao_clock_normal_start(void)
        cfgr |= (STM_RCC_CFGR_PLLSRC_TARGET_CLOCK  << STM_RCC_CFGR_PLLSRC);
        stm_rcc.cfgr = cfgr;
 
-       /* Disable pre divider */
-       stm_rcc.cfgr2 = (STM_RCC_CFGR2_PREDIV_1 << STM_RCC_CFGR2_PREDIV);
+       /* Set pre divider */
+       stm_rcc.cfgr2 = (AO_RCC_CFGR2_PLLDIV << STM_RCC_CFGR2_PREDIV);
 
        /* Enable the PLL and wait for it */
        stm_rcc.cr |= (1 << STM_RCC_CR_PLLON);
@@ -201,9 +218,6 @@ ao_clock_normal_start(void)
 
 #endif
 
-#endif
-
-
 #if AO_HSI48
 #define STM_RCC_CFGR_SWS_TARGET_CLOCK          STM_RCC_CFGR_SWS_HSI48
 #define STM_RCC_CFGR_SW_TARGET_CLOCK           STM_RCC_CFGR_SW_HSI48
@@ -225,6 +239,8 @@ ao_clock_normal_start(void)
 #define STM_PLLSRC                             STM_HSI
 #define STM_RCC_CFGR_PLLSRC_TARGET_CLOCK       0
 #endif
+
+
 }
 
 static void
@@ -302,14 +318,34 @@ ao_clock_init(void)
        /* Clear reset flags */
        stm_rcc.csr |= (1 << STM_RCC_CSR_RMVF);
 
+#ifdef AO_MCO_PORT
+       cfgr = stm_rcc.cfgr;
+
+       /* Send PLL clock to MCO */
+       cfgr &= ~(STM_RCC_CFGR_MCO_MASK << STM_RCC_CFGR_MCO);
+       cfgr |= (STM_RCC_CFGR_MCO_PLLCLK << STM_RCC_CFGR_MCO);
+
+       /* Divide by 1 */
+       cfgr &= ~(STM_RCC_CFGR_MCOPRE_DIV_MASK << STM_RCC_CFGR_MCOPRE);
+       cfgr |= (STM_RCC_CFGR_MCOPRE_DIV_1 << STM_RCC_CFGR_MCOPRE);
+
+       /* Don't divide PLL */
+       cfgr |= (1 << STM_RCC_CFGR_PLL_NODIV);
+
+       stm_rcc.cfgr = cfgr;
+
+       ao_enable_port(AO_MCO_PORT);
+       stm_ospeedr_set(AO_MCO_PORT, AO_MCO_PIN, STM_OSPEEDR_HIGH);
+       stm_afr_set(AO_MCO_PORT, AO_MCO_PIN, AO_MCO_AF);
+#endif
+
 #if DEBUG_THE_CLOCK
        /* Output SYSCLK on PA8 for measurments */
 
        stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIOAEN);
 
        stm_afr_set(&stm_gpioa, 8, STM_AFR_AF0);
-       stm_moder_set(&stm_gpioa, 8, STM_MODER_ALTERNATE);
-       stm_ospeedr_set(&stm_gpioa, 8, STM_OSPEEDR_40MHz);
+       stm_ospeedr_set(&stm_gpioa, 8, STM_OSPEEDR_HIGH);
 
        stm_rcc.cfgr |= (STM_RCC_CFGR_MCOPRE_DIV_1 << STM_RCC_CFGR_MCOPRE);
        stm_rcc.cfgr |= (STM_RCC_CFGR_MCOSEL_HSE << STM_RCC_CFGR_MCOSEL);