Diff: F446_ADC.cpp

Revision:

0:c945b4fe9a48

Child:

1:6b9f2af6613d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/F446_ADC.cpp	Fri Nov 11 06:28:48 2016 +0000
@@ -0,0 +1,92 @@
+//----------------------------------------------------------
+//  Simultanuous AD Conversion by polling using
+//  ADC2 and ADC3 on STM32F446 ---- Header
+//
+//  STM32F446 の ADC2, ADC3 を使って同時に AD 変換を開始し，
+//  ポーリングによりアナログ信号を入力するクラス
+//      A0 (PA_0) :  ADC2 CH0
+//      A1 (PA_1) :  ADC3 CH1
+//
+//  2016/11/11, Copyright (c) 2016 MIKAMI, Naoki
+//----------------------------------------------------------
+
+#include "F446_ADC.hpp"
+
+namespace Mikami
+{
+    AdcDual::AdcDual(int frequency)
+    {
+        // Set GPIOA for ADC
+        __HAL_RCC_GPIOA_CLK_ENABLE();
+        GPIO_InitTypeDef gpioInit;
+        gpioInit.Pin = GPIO_PIN_0 | GPIO_PIN_1;
+        gpioInit.Mode = GPIO_MODE_ANALOG;
+        gpioInit.Pull = GPIO_NOPULL;
+        gpioInit.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+        HAL_GPIO_Init(GPIOA, &gpioInit);
+
+        // ADC2 の設定
+        __HAL_RCC_ADC2_CLK_ENABLE();
+        ADC2->CR1 = 0x0;
+        ADC2->CR2 = ADC_EXTERNALTRIGCONVEDGE_RISING // 外部トリガの立ち上がりで開始される
+                  | ADC_EXTERNALTRIGCONV_T8_TRGO    // 外部トリガ： Timer8 TRGO event
+                  | ADC_CR2_ADON;                   // ADC を有効にする
+        ADC2->SQR3 = 0x0;                           // CH0 を使う
+
+        // ADC3 の設定
+        __HAL_RCC_ADC3_CLK_ENABLE();
+        ADC3->CR1 = 0x0;
+        ADC3->CR2 = ADC_EXTERNALTRIGCONVEDGE_RISING // 外部トリガの立ち上がりで開始される
+                  | ADC_EXTERNALTRIGCONV_T8_TRGO    // 外部トリガ： Timer8 TRGO event
+                  | ADC_CR2_ADON;                   // ADC を有効にする
+        ADC3->SQR3 = 0x1;                           // CH1 を使う
+        
+        // ADC 共通の設定
+        ADC->CCR = 0x0;     // 念のため
+
+        // AD 変換器の外部トリガに使うタイマ (TIM8) の設定
+        SetTim8(frequency);
+    }
+
+    void AdcDual::Read(float &ad1, float &ad2)
+    {
+        WaitDone();
+        ad1 = ToFloat(ADC2->DR);
+        ad2 = ToFloat(ADC3->DR);
+    }
+
+    void AdcDual::Read(uint16_t &ad1, uint16_t &ad2)
+    {
+        WaitDone();
+        ad1 = ADC2->DR;
+        ad2 = ADC3->DR;
+    }
+
+    void AdcDual::SetTim8(int frequency)
+    {
+        __HAL_RCC_TIM8_CLK_ENABLE();    // Supply clock. See "stm32f4xx_hal_rcc.h"
+        SystemCoreClockUpdate();        // Update core clock. See "system_stm32f4xx.h"
+        TIM_TypeDef* const myTim = TIM8;
+
+        myTim->CR2 = TIM_CR2_MMS_1; // Update event: as trigger out
+
+    	uint32_t psc = 0;
+        uint16_t mul = 1;
+        uint32_t arr;
+        while (true)
+        {
+            arr = SystemCoreClock/(mul*frequency);
+            if (arr <= 65536) break;
+            psc++;
+            mul++;
+            if (psc > 65535)
+            {
+                fprintf(stderr, "Sampling frequency: too low.\r\n");
+                while (true) {}
+            }
+        }
+        myTim->ARR = arr - 1;       // Auto-reload
+        myTim->PSC = psc;           // Prescaler
+        myTim->CR1 = TIM_CR1_CEN;   // Enable TIM8
+    }
+}
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