Added I2C support for raspi & first rework of debugging

src/devices/stm32/delay.cpp

@@ -0,0 +1,75 @@
+#include <sta/stm32/delay.hpp>
+#ifdef STA_PLATFORM_STM32
+
+#include <sta/stm32/hal.hpp>
+#include <sta/stm32/clocks.hpp>
+
+#include <sta/assert.hpp>
+#include <sta/lang.hpp>
+
+
+namespace sta
+{
+    void delayMs(uint32_t ms)
+    {
+        HAL_Delay(ms);
+    }
+} // namespace sta
+
+
+#ifdef STA_STM32_DELAY_US_TIM
+
+#ifndef HAL_TIM_MODULE_ENABLED
+#  error "STM32 HAL TIM module not enabled!"
+#endif // HAL_TIM_MODULE_ENABLED
+
+#include <tim.h>
+
+namespace sta
+{
+    uint32_t gDelayUsMul = 1;
+
+    void delayUs(uint32_t us)
+    {
+        __HAL_TIM_SET_COUNTER(&STA_STM32_DELAY_US_TIM, 0);
+        while (__HAL_TIM_GET_COUNTER(&STA_STM32_DELAY_US_TIM) < us * gDelayUsMul);
+    }
+
+
+    bool isValidDelayUsTIM()
+    {
+        // Get PCLK multiplier for TIM clock
+        uint32_t pclkMul = 1;
+        switch (STA_STM32_DELAY_US_TIM.Init.ClockDivision)
+        {
+        case TIM_CLOCKDIVISION_DIV1:
+            pclkMul = 1;
+            break;
+        case TIM_CLOCKDIVISION_DIV2:
+            pclkMul = 2;
+            break;
+        case TIM_CLOCKDIVISION_DIV4:
+            pclkMul = 4;
+            break;
+        default:
+            STA_ASSERT(false);
+            STA_UNREACHABLE();
+        }
+
+        // Calculate TIM clock frequency
+        uint32_t clkFreq = pclkMul * STA_STM32_GET_HANDLE_PCLK_FREQ_FN(STA_STM32_DELAY_US_TIM)();
+        // Calculate update frequency based on prescaler value
+        uint32_t prescaler = (STA_STM32_DELAY_US_TIM.Init.Prescaler) ? STA_STM32_DELAY_US_TIM.Init.Prescaler : 1;
+        uint32_t updateFreq = clkFreq / prescaler;
+
+        gDelayUsMul = updateFreq / 1000000;
+
+        // TIM must have at least microsecond precision (>= 1 MHz frequency)
+        return (updateFreq >= 1000000);
+    }
+} // namespace sta
+
+#endif // STA_STM32_DELAY_US_TIM
+
+
+#endif // STA_PLATFORM_STM32