Add voltage ADC, standardize mphalport

ports/stm32f4/common-hal/microcontroller/Processor.c

@@ -37,12 +37,26 @@
 #define ADC_CAL_ADDRESS         (0x1fff7a2a)
 #define ADC_CAL1                ((uint16_t*)(ADC_CAL_ADDRESS + 2))
 #define ADC_CAL2                ((uint16_t*)(ADC_CAL_ADDRESS + 4))
+#define VREFIN_CAL ((uint16_t *)ADC_CAL_ADDRESS)
 
 // correction factor for reference value
 STATIC volatile float adc_refcor = 1.0f;
 
-#define CORE_TEMP_V25          (943)  /* (0.76v/3.3v)*(2^ADC resoultion) */
+STATIC void set_adc_params(ADC_HandleTypeDef *AdcHandle) {
-#define CORE_TEMP_AVG_SLOPE    (3)    /* (2.5mv/3.3v)*(2^ADC resoultion) */
+    AdcHandle->Instance = ADC1;
+    AdcHandle->Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
+    AdcHandle->Init.Resolution = ADC_RESOLUTION_12B;
+    AdcHandle->Init.ScanConvMode = DISABLE;
+    AdcHandle->Init.ContinuousConvMode = DISABLE;
+    AdcHandle->Init.DiscontinuousConvMode = DISABLE;
+    AdcHandle->Init.NbrOfDiscConversion = 0;
+    AdcHandle->Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
+    AdcHandle->Init.ExternalTrigConv = ADC_SOFTWARE_START;
+    AdcHandle->Init.DataAlign = ADC_DATAALIGN_RIGHT;
+    AdcHandle->Init.NbrOfConversion = 1;
+    AdcHandle->Init.DMAContinuousRequests = DISABLE;
+    AdcHandle->Init.EOCSelection = ADC_EOC_SINGLE_CONV;
+}
 
 float common_hal_mcu_processor_get_temperature(void) {
     __HAL_RCC_ADC1_CLK_ENABLE();
@@ -50,20 +64,7 @@ float common_hal_mcu_processor_get_temperature(void) {
     //HAL Implementation
     ADC_HandleTypeDef AdcHandle;
     ADC_ChannelConfTypeDef sConfig;
-
+    set_adc_params(&AdcHandle);
-    AdcHandle.Instance = ADC1;
-    AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
-    AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
-    AdcHandle.Init.ScanConvMode = DISABLE;
-    AdcHandle.Init.ContinuousConvMode = DISABLE;
-    AdcHandle.Init.DiscontinuousConvMode = DISABLE;
-    AdcHandle.Init.NbrOfDiscConversion = 0;
-    AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
-    AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
-    AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
-    AdcHandle.Init.NbrOfConversion = 1;
-    AdcHandle.Init.DMAContinuousRequests = DISABLE;
-    AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
     HAL_ADC_Init(&AdcHandle);
 
     ADC->CCR |= ADC_CCR_TSVREFE;
@@ -71,7 +72,7 @@ float common_hal_mcu_processor_get_temperature(void) {
 
     sConfig.Channel = ADC_CHANNEL_TEMPSENSOR; //either 16 or 18, depending on chip
     sConfig.Rank = 1;
-    sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES; //Taken from micropython
+    sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES; // Temp sensor likes 10us minimum
     HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
 
     HAL_ADC_Start(&AdcHandle);
@@ -84,50 +85,35 @@ float common_hal_mcu_processor_get_temperature(void) {
     //There's no F4 specific appnote for this but it works the same as the L1 in AN3964
     float core_temp_avg_slope = (*ADC_CAL2 - *ADC_CAL1) / 80.0;
     return (((float)value * adc_refcor - *ADC_CAL1) / core_temp_avg_slope) + 30.0f;
-
-    // STATIC uint32_t adc_config_and_read_channel(ADC_HandleTypeDef *adcHandle, uint32_t channel) {
-    // adc_config_channel(adcHandle, channel);
-    // uint32_t raw_value = adc_read_channel(adcHandle);
-
-    // #if defined(STM32F4) || defined(STM32F7)
-    // // ST docs say that (at least on STM32F42x and STM32F43x), VBATE must
-    // // be disabled when TSVREFE is enabled for TEMPSENSOR and VREFINT
-    // // conversions to work.  VBATE is enabled by the above call to read
-    // // the channel, and here we disable VBATE so a subsequent call for
-    // // TEMPSENSOR or VREFINT works correctly.
-    // if (channel == ADC_CHANNEL_VBAT) {
-    //     ADC->CCR &= ~ADC_CCR_VBATE;
-    // }
-    // #endif
-
-    // return raw_value;
-
-    //     int adc_read_core_temp(ADC_HandleTypeDef *adcHandle) {
-    //     int32_t raw_value = adc_config_and_read_ref(adcHandle, ADC_CHANNEL_TEMPSENSOR);
-    //     return ((raw_value - CORE_TEMP_V25) / CORE_TEMP_AVG_SLOPE) + 25;
-    // }
-
-    // #if MICROPY_PY_BUILTINS_FLOAT
-    // // correction factor for reference value
-    // STATIC volatile float adc_refcor = 1.0f;
-
-    // float adc_read_core_temp_float(ADC_HandleTypeDef *adcHandle) {
-    //     int32_t raw_value = adc_config_and_read_ref(adcHandle, ADC_CHANNEL_TEMPSENSOR);
-    //     float core_temp_avg_slope = (*ADC_CAL2 - *ADC_CAL1) / 80.0;
-    //     return (((float)raw_value * adc_refcor - *ADC_CAL1) / core_temp_avg_slope) + 30.0f;
-    // }
 }
 
 float common_hal_mcu_processor_get_voltage(void) {
-//  float adc_read_core_vref(ADC_HandleTypeDef *adcHandle) {
+    __HAL_RCC_ADC1_CLK_ENABLE();
-//     uint32_t raw_value = adc_config_and_read_ref(adcHandle, ADC_CHANNEL_VREFINT);
 
-//     // update the reference correction factor
+    //HAL Implementation
-//     adc_refcor = ((float)(*VREFIN_CAL)) / ((float)raw_value);
+    ADC_HandleTypeDef AdcHandle;
+    ADC_ChannelConfTypeDef sConfig;
+    set_adc_params(&AdcHandle);
+    HAL_ADC_Init(&AdcHandle);
 
-//     return (*VREFIN_CAL) * ADC_SCALE;
+    ADC->CCR |= ADC_CCR_TSVREFE;
-// }
+
-    return NAN;
+    sConfig.Channel = ADC_CHANNEL_VREFINT;
+    sConfig.Rank = 1;
+    sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
+    HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
+
+    HAL_ADC_Start(&AdcHandle);
+    if (HAL_ADC_PollForConversion(&AdcHandle,1) != HAL_OK) {
+        mp_raise_RuntimeError(translate("Voltage read timed out"));
+    }
+    uint32_t value = (uint32_t)HAL_ADC_GetValue(&AdcHandle);
+    HAL_ADC_Stop(&AdcHandle);
+
+    //This value could be used to actively correct ADC values. 
+    adc_refcor = ((float)(*VREFIN_CAL)) / ((float)value);
+
+    return adc_refcor * 3.3f;
 }
 
 uint32_t common_hal_mcu_processor_get_frequency(void) {

ports/stm32f4/mphalport.c

@@ -31,18 +31,15 @@
 #include "py/mpstate.h"
 #include "py/gc.h"
 
+#include "shared-bindings/microcontroller/__init__.h"
 #include "supervisor/shared/tick.h"
+#include "stm32f4xx_hal.h"
 
-/*------------------------------------------------------------------*/
-/* delay
- *------------------------------------------------------------------*/
 void mp_hal_delay_ms(mp_uint_t delay) {
     uint64_t start_tick = supervisor_ticks_ms64();
     uint64_t duration = 0;
     while (duration < delay) {
-        #ifdef MICROPY_VM_HOOK_LOOP
+        RUN_BACKGROUND_TASKS;
-            MICROPY_VM_HOOK_LOOP
-        #endif
         // Check to see if we've been CTRL-Ced by autoreload or the user.
         if(MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception)) ||
            MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_reload_exception))) {
@@ -52,3 +49,15 @@ void mp_hal_delay_ms(mp_uint_t delay) {
         // TODO(tannewt): Go to sleep for a little while while we wait.
     }
 }
+
+void mp_hal_delay_us(mp_uint_t delay) {
+    common_hal_mcu_delay_us();
+}
+
+void mp_hal_disable_all_interrupts(void) {
+    common_hal_mcu_disable_interrupts();
+}
+
+void mp_hal_enable_all_interrupts(void) {
+    common_hal_mcu_enable_interrupts();
+}

ports/stm32f4/mphalport.h

@@ -24,20 +24,28 @@
  * THE SOFTWARE.
  */
 
-#ifndef __STM32F4_HAL
+#ifndef MICROPY_INCLUDED_STM32F4_MPHALPORT_H
-#define __STM32F4_HAL
+#define MICROPY_INCLUDED_STM32F4_MPHALPORT_H
 
-#include <stdbool.h>
+#include "py/obj.h"
-#include <stdint.h>
+
+#include "lib/oofatfs/ff.h"
 
-#include "lib/utils/interrupt_char.h"
-#include "py/mpconfig.h"
 #include "supervisor/shared/tick.h"
 
+// Global millisecond tick count (driven by SysTick interrupt).
+static inline mp_uint_t mp_hal_ticks_ms(void) {
+  return supervisor_ticks_ms32();
+}
+// Number of bytes in receive buffer
+volatile uint8_t usb_rx_count;
+volatile bool mp_cdc_enabled;
 
-#define mp_hal_ticks_ms()       ((mp_uint_t) supervisor_ticks_ms32())
+int receive_usb(void);
-//#define mp_hal_delay_us(us)     NRFX_DELAY_US((uint32_t) (us))
 
-bool mp_hal_stdin_any(void);
+void mp_hal_set_interrupt_char(int c);
 
-#endif
+void mp_hal_disable_all_interrupts(void);
+void mp_hal_enable_all_interrupts(void);
+
+#endif // MICROPY_INCLUDED_STM32F4_MPHALPORT_H