implemented timebase using TIM14 instead of TIM1

USB/usbd_conf.c

@@ -629,10 +629,10 @@ void HAL_PCDEx_LPM_Callback(PCD_HandleTypeDef *hpcd, PCD_LPM_MsgTypeDef msg)
   * @param  Delay: Delay in ms
   * @retval None
   */
-void  USBD_LL_Delay (uint32_t Delay)
-{
-  HAL_Delay(Delay);  
-}
+//void  USBD_LL_Delay (uint32_t Delay)
+//{
+//  HAL_Delay(Delay);
+//}
 
 /**
   * @brief  static single allocation.

USB/usbd_conf.h

@@ -109,10 +109,10 @@
 /* Memory management macros */  
 #define USBD_malloc               (uint32_t *)USBD_static_malloc
 #define USBD_free                 USBD_static_free
-#define USBD_memset               /* Not used */
-#define USBD_memcpy               /* Not used */
-
-#define USBD_Delay   HAL_Delay
+//#define USBD_memset               /* Not used */
+//#define USBD_memcpy               /* Not used */
+//
+//#define USBD_Delay   HAL_Delay
 
 /* For footprint reasons and since only one allocation is handled in the HID class
    driver, the malloc/free is changed into a static allocation method */

cortex_handlers.c

@@ -3,28 +3,20 @@
 // (moved from the top level project for easier maintenance)
 //
 
-/* Includes ------------------------------------------------------------------*/
-
 #include "platform.h"
 #include <TinyFrame.h>
 #include "platform/debug_uart.h"
 #include "platform/status_led.h"
 #include "utils/stacksmon.h"
+#include "gex_hooks.h"
 
-/* External variables --------------------------------------------------------*/
-
-/******************************************************************************/
-/*            Cortex-M3 Processor Interruption and Exception Handlers         */ 
-/******************************************************************************/
 
-/******************************************************************************/
-/* STM32F1xx Peripheral Interrupt Handlers                                    */
-/* Add here the Interrupt Handlers for the used peripherals.                  */
-/* For the available peripheral interrupt handler names,                      */
-/* please refer to the startup file (startup_stm32f1xx.s).                    */
-/******************************************************************************/
+void SysTick_Handler(void)
+{
+    GEX_MsTick();
+    osSystickHandler();
+}
 
-/* USER CODE BEGIN 1 */
 
 #define tFAULT "\r\n\033[31mSYSTEM FAULT:\033[m"
 
@@ -236,6 +228,3 @@ caddr_t _sbrk(int incr) {
     return (caddr_t) prev_heap_end;
 }
 #endif
-
-/* USER CODE END 1 */
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

platform/irq_dispatcher.c

@@ -84,11 +84,12 @@ void irqd_init(void)
     HAL_NVIC_SetPriority(DMA1_Channel2_3_IRQn, 3, 0);
     HAL_NVIC_SetPriority(DMA1_Channel4_5_6_7_IRQn, 3, 0);
 //    NVIC_EnableIRQ(ADC1_COMP_IRQn);             /*!< ADC1 and COMP interrupts (ADC interrupt combined with EXTI Lines 21 and 22 */
+//    NVIC_EnableIRQ(TIM1_IRQn);                  /*!< TIM1 global Interrupt                                          */
 //    NVIC_EnableIRQ(TIM2_IRQn);                  /*!< TIM2 global Interrupt                                           */
 //    NVIC_EnableIRQ(TIM3_IRQn);                  /*!< TIM3 global Interrupt                                           */
 //    NVIC_EnableIRQ(TIM6_DAC_IRQn);              /*!< TIM6 global and DAC channel underrun error Interrupt            */
 //    NVIC_EnableIRQ(TIM7_IRQn);                  /*!< TIM7 global Interrupt                                           */
-//    NVIC_EnableIRQ(TIM14_IRQn);                 /*!< TIM14 global Interrupt                                          */
+//  --used internally--  NVIC_EnableIRQ(TIM14_IRQn);                 /*!< TIM14 global Interrupt                                          */
 //    NVIC_EnableIRQ(TIM15_IRQn);                 /*!< TIM15 global Interrupt                                          */
 //    NVIC_EnableIRQ(TIM16_IRQn);                 /*!< TIM16 global Interrupt                                          */
 //    NVIC_EnableIRQ(TIM17_IRQn);                 /*!< TIM17 global Interrupt                                          */

platform/plat_init.c

@@ -14,6 +14,7 @@
 #include "status_led.h"
 #include "debug_uart.h"
 #include "irq_dispatcher.h"
+#include "timebase.h"
 
 void plat_init(void)
 {
@@ -26,7 +27,7 @@ void plat_init(void)
 
     LockJumper_Init();
     Indicator_Init();
-    DebugUart_Init(); // <- only the resource claim
+    DebugUart_Init(); // resource claim
 
     irqd_init();
 

platform/timebase.c

@@ -0,0 +1,98 @@
+//
+// Created by MightyPork on 2018/01/27.
+//
+
+#include "platform.h"
+#include "timebase.h"
+
+#define TIMEBASE_TIMER TIM14
+
+HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
+{
+    // TIM14 is a simple 16-bit timer timer with no special features.
+    // This makes it a good choice for the timebase generation. We set it to generate
+    // an interrupt every 1 ms
+
+    // - TIM14 is always up-counting
+    // - using APB1 clock
+    __HAL_RCC_TIM14_CLK_ENABLE();
+    NVIC_SetPriority(TIM14_IRQn, TickPriority); // highest possible priority
+    NVIC_EnableIRQ(TIM14_IRQn);
+
+    /* Compute TIM1 clock */
+    uint32_t uwTimclock = HAL_RCC_GetPCLK1Freq();
+    /* Get a 1 MHz clock for the timer */
+    uint16_t uhPrescalerValue = (uint16_t) ((uwTimclock / 1000000) - 1);
+    /* Get 1 kHz interrupt */
+    uint16_t uhPeriod = (1000000 / 1000) - 1;
+
+    LL_TIM_SetPrescaler(TIMEBASE_TIMER, uhPrescalerValue);
+    LL_TIM_SetAutoReload(TIMEBASE_TIMER, uhPeriod);
+    LL_TIM_EnableARRPreload(TIMEBASE_TIMER);
+    LL_TIM_EnableIT_UPDATE(TIMEBASE_TIMER);
+    LL_TIM_GenerateEvent_UPDATE(TIMEBASE_TIMER);
+
+    LL_TIM_EnableCounter(TIMEBASE_TIMER);
+
+    /* Return function status */
+    return HAL_OK;
+}
+
+static volatile uint32_t uwUptimeMs = 0;
+
+/* TIMEBASE TIMER ISR */
+void TIM14_IRQHandler(void)
+{
+    uwUptimeMs++;
+    LL_TIM_ClearFlag_UPDATE(TIMEBASE_TIMER);
+}
+
+void HAL_IncTick(void)
+{
+    uwUptimeMs++;
+}
+
+uint32_t HAL_GetTick(void)
+{
+    return uwUptimeMs;
+}
+
+void HAL_SuspendTick(void)
+{
+    LL_TIM_DisableIT_UPDATE(TIMEBASE_TIMER);
+}
+
+void HAL_ResumeTick(void)
+{
+    LL_TIM_EnableIT_UPDATE(TIMEBASE_TIMER);
+}
+
+// -------------------------------------------------------------------------------------
+
+// Timestamping functions ...
+
+/*
+ * I wanted to freeze time. I wanted to savor that moment, to live in that moment
+ * for a week. But I couldn't stop it, only slow it. And before I knew it, she was gone.
+ * -- Ben Willis, "Cashback"
+ */
+uint64_t PTIM_GetMicrotime(void)
+{
+    uint32_t uwMicros;
+    uint32_t uwMillis;
+
+    vPortEnterCritical();
+    {
+        uwMicros = TIMEBASE_TIMER->CNT;
+        uwMillis = uwUptimeMs;
+
+        if (LL_TIM_IsActiveFlag_UPDATE(TIM14)) {
+            // This means the timer has overflown after we disabled IRQ
+            // Use the last CNT value before the overflow
+            uwMicros = TIM14->ARR; // this is 999us
+        }
+    }
+    vPortExitCritical();
+
+    return (uint64_t)uwMillis*1000 + uwMicros;
+}

platform/timebase.h

@@ -0,0 +1,22 @@
+//
+// Created by MightyPork on 2018/01/27.
+//
+// Configures and manages the high priority timer used for timeouts and precision delays.
+//
+// SysTick can't be used for this because, under FreeRTOS, the system tick interrupt
+// has the lowest priority to not interfere with more important application processes
+// and interrupts.
+//
+
+#ifndef GEX_F072_TIMEBASE_H
+#define GEX_F072_TIMEBASE_H
+
+/**
+ * Precision timer: get microtime as uint64_t
+ * This timestamp should be monotonously increasing with a precision of ±0.5µs
+ *
+ * @return time in microseconds
+ */
+uint64_t PTIM_GetMicrotime(void);
+
+#endif //GEX_F072_TIMEBASE_H

units/digital_in/unit_din.c

@@ -163,6 +163,9 @@ static error_t DI_preInit(Unit *unit)
     return E_SUCCESS;
 }
 
+/**
+ * Send a trigger event to master (called on the message queue thread)
+ */
 static void ID_SendTriggerReportToMaster(Job *job)
 {
     Unit *unit = job->data1;
@@ -179,6 +182,11 @@ static void ID_SendTriggerReportToMaster(Job *job)
     com_send_pb(MSG_UNIT_REPORT, &pb);
 }
 
+/**
+ * EXTI callback for pin change interrupts
+ *
+ * @param arg - the unit is passed here
+ */
 static void DI_handleExti(void *arg)
 {
     Unit *unit = arg;
@@ -295,15 +303,14 @@ static void DI_deInit(Unit *unit)
 
     // pins are de-inited during teardown
 
-    if (unit->status == E_SUCCESS) {
-        // Detach EXTI handlers and disable interrupts
-        if (priv->trig_rise | priv->trig_fall) {
-            uint16_t mask = 1;
-            for (int i = 0; i < 16; i++, mask <<= 1) {
-                if ((priv->trig_rise | priv->trig_fall) & mask) {
-                    LL_EXTI_DisableIT_0_31(LL_EXTI_LINES[i]);
-                    irqd_detach(EXTIS[i], DI_handleExti);
-                }
+    // Detach EXTI handlers and disable interrupts
+    const uint16_t triggs = priv->trig_rise | priv->trig_fall;
+    if (unit->status == E_SUCCESS && triggs) {
+        uint16_t mask = 1;
+        for (int i = 0; i < 16; i++, mask <<= 1) {
+            if (triggs & mask) {
+                LL_EXTI_DisableIT_0_31(LL_EXTI_LINES[i]);
+                irqd_detach(EXTIS[i], DI_handleExti);
             }
         }
     }