Diff: main.cpp

Revision:

0:e99d70686026

Child:

2:3201a7da544e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Oct 07 15:38:11 2015 +0000
@@ -0,0 +1,190 @@
+#include "mbed.h"
+#include "LCD_DISCO_L476VG.h"
+
+LCD_DISCO_L476VG lcd;
+
+DigitalOut led_green(LED1);
+DigitalOut led_red(LED2);
+
+InterruptIn joy_down(JOYSTICK_DOWN);
+InterruptIn joy_up(JOYSTICK_UP);
+
+Ticker app_ticker;
+
+int deepsleep_mode;
+
+void SystemClockConfig(void);
+void LowPowerConfiguration(void);
+
+void wakeup_tasks()
+{
+    led_green = 1;
+    lcd.Clear();
+    lcd.DisplayString((uint8_t *)"WAKEUP");
+    wait(0.5);
+}
+
+// Used to enter in deepsleep mode
+void joy_down_pressed()
+{
+    led_red = 1;
+    deepsleep_mode = 1;
+    wait(0.5);
+}
+
+// Used to exit from deepsleep mode
+void joy_up_pressed()
+{
+    led_green = 1;
+    deepsleep_mode = 0;
+}
+
+int main()
+{
+    led_green = 1;
+    led_red = 1;
+    lcd.Clear();
+    lcd.DisplayString((uint8_t *)"HELLO");
+    wait(1.0);
+
+    // Configure the buttons
+    joy_down.rise(&joy_down_pressed);
+    joy_down.mode(PullDown);
+    joy_up.rise(&joy_up_pressed);
+    joy_up.mode(PullDown);
+
+    deepsleep_mode = 0;
+
+    LowPowerConfiguration();
+
+    while(1) {
+
+        SystemClockConfig();
+
+        app_ticker.detach();
+        app_ticker.attach(&wakeup_tasks, 5.0); // Wake-up every 5 seconds
+
+        led_green = 0;
+        led_red = 0;
+        lcd.Clear();
+
+        if (deepsleep_mode == 0) {
+            lcd.DisplayString((uint8_t *)"SLEEP");
+            sleep();
+        } else {
+            // Ensure that MSI is the wake-up system clock
+            HAL_RCCEx_WakeUpStopCLKConfig(RCC_STOP_WAKEUPCLOCK_MSI);
+            __HAL_RCC_PWR_CLK_ENABLE();
+            HAL_PWREx_DisableLowPowerRunMode();
+            lcd.DisplayString((uint8_t *)"DSLEEP");
+            deepsleep();
+        }
+    }
+}
+
+void SystemClockConfig(void)
+{
+    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+
+    /* MSI 2 MHz as source clock for Low Power Run mode */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
+    RCC_OscInitStruct.MSIState = RCC_MSI_ON;
+    RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_5; // 2 MHz
+    RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_OFF;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+        // Error
+    }
+
+    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
+       clocks dividers */
+    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) {
+        // Error
+    }
+
+    /* The voltage scaling allows optimizing the power consumption when the device is
+       clocked below the maximum system frequency, to update the voltage scaling value
+       regarding system frequency refer to product datasheet.  */
+
+    /* Enable Power Control clock */
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE2) != HAL_OK) {
+        // Error
+    }
+
+    /* Enter Low Power Run mode */
+    HAL_PWREx_EnableLowPowerRunMode();
+
+    /* Disable Power Control clock */
+    __HAL_RCC_PWR_CLK_DISABLE();
+
+    SystemCoreClockUpdate();
+}
+
+// This is just an example of configuration !!!
+void LowPowerConfiguration(void)
+{
+    GPIO_InitTypeDef GPIO_InitStruct;
+
+    // Configure all unused GPIOs in Analog Input mode
+    // Used GPIOs are:
+    // LED1: PA8
+    // LED2: PB2
+    // Joystick Up/Down: PA3,5
+    // LCD: PA6..10,15 + PB0,1,4,5,9,12..15 + PC3..8 + PD8..15
+    // SWD: PA13,14
+    GPIO_InitStruct.Mode      = GPIO_MODE_ANALOG;
+    GPIO_InitStruct.Pull      = GPIO_NOPULL;
+    GPIO_InitStruct.Speed     = GPIO_SPEED_LOW;
+
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    GPIO_InitStruct.Pin       = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_4|
+                                GPIO_PIN_11|GPIO_PIN_12;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    GPIO_InitStruct.Pin       = GPIO_PIN_3|GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_8|
+                                GPIO_PIN_10|GPIO_PIN_11;
+    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+    __HAL_RCC_GPIOC_CLK_ENABLE();
+    GPIO_InitStruct.Pin       = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_9|
+                                GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|
+                                GPIO_PIN_14|GPIO_PIN_15;
+    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
+
+    __HAL_RCC_GPIOD_CLK_ENABLE();
+    GPIO_InitStruct.Pin       = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3|
+                                GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;
+    HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
+
+    __HAL_RCC_GPIOE_CLK_ENABLE();
+    GPIO_InitStruct.Pin       = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3|
+                                GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7|
+                                GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|
+                                GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
+    HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
+
+    __HAL_RCC_GPIOH_CLK_ENABLE();
+    GPIO_InitStruct.Pin       = GPIO_PIN_0|GPIO_PIN_1;
+    HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);
+
+    // Disable peripherals clock
+    __HAL_RCC_GPIOH_CLK_DISABLE();
+
+    // Disable peripherals clock in Sleep/Stop mode
+    // Keep TIMER5 used for the ticker
+    RCC->AHB1SMENR  = 0x0;
+    RCC->AHB2SMENR  = 0x0;
+    RCC->AHB3SMENR  = 0x0;
+    RCC->APB1SMENR1 = RCC_APB1SMENR1_TIM5SMEN;
+    RCC->APB1SMENR2 = 0x0;
+    RCC->APB2SMENR  = 0x0;
+}