cpu/stm32_common: minimize consumption for STM32F

RIOT-OS · Apr 12, 2019 · 8ed7a80 · 8ed7a80
1 parent f4df055
commit 8ed7a80
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Showing 3 changed files with 82 additions and 37 deletions.
diff --git a/cpu/stm32_common/cpu_init.c b/cpu/stm32_common/cpu_init.c
@@ -50,43 +50,10 @@ void cpu_init(void)
     periph_clk_en(APB1, BIT_APB_PWREN);
     /* initialize the system clock as configured in the periph_conf.h */
     stmclk_init_sysclk();
-
-#if defined(CPU_FAM_STM32L1)
-    uint32_t ahb_gpio_clocks;
-    GPIO_TypeDef *port;
-
-    /* enable GPIO clock and save GPIO clock configuration */
-    ahb_gpio_clocks = RCC->AHBENR & 0xFF;
-    periph_clk_en(AHB, 0xFF);
-
-    /* switch all GPIOs to AIN mode to minimize power consumption */
-    /* can't be more than 12 ports on STM32L1 */
-    for (int i = 0; i < 12; i++) {
-        port = (GPIO_TypeDef *)(GPIOA_BASE + i*(GPIOB_BASE - GPIOA_BASE));
-        if (IS_GPIO_ALL_INSTANCE(port)) {
-#if !defined (DISABLE_JTAG)
-            switch (i) {
-                /* preserve JTAG pins on PORTA and PORTB */
-                case 0:
-                    port->MODER = 0xABFFFFFF;
-                    break;
-                case 1:
-                    port->MODER = 0xFFFFFEBF;
-                    break;
-                default:
-                    port->MODER = 0xFFFFFFFF;
-                    break;
-            }
-#else
-            port->MODER = 0xFFFFFFFF;
-#endif
-        }
-        else {
-            break;
-        }
-    /* restore GPIO clock */
-    periph_clk_en(AHB, ((RCC->AHBENR & ~((uint32_t)0xFF)) | ahb_gpio_clocks));
-    }
+#if defined(CPU_FAM_STM32F0) || defined(CPU_FAM_STM32F2) || \
+    defined(CPU_FAM_STM32F3) || defined(CPU_FAM_STM32F4) || \
+    defined(CPU_FAM_STM32F7) || defined(CPU_FAM_STM32L1)
+    gpio_pm_init_ain();
 #endif
 #ifdef MODULE_PERIPH_DMA
     /*  initialize DMA streams */

diff --git a/cpu/stm32_common/include/periph_cpu_common.h b/cpu/stm32_common/include/periph_cpu_common.h
@@ -601,6 +601,20 @@ void gpio_init_af(gpio_t pin, gpio_af_t af);
  */
 void gpio_init_analog(gpio_t pin);
 
+
+#if defined(CPU_FAM_STM32F0) || defined(CPU_FAM_STM32F2) || \
+    defined(CPU_FAM_STM32F3) || defined(CPU_FAM_STM32F4) || \
+    defined(CPU_FAM_STM32F7) || defined(CPU_FAM_STM32L1)
+/**
+ * @brief   Initialize gpio to AIN
+ *
+ * stm32l1 and stm32f need to have all there pins initialized to AIN to achieve
+ * lowest power consumption (this makes the difference between 500uA and 1.7uA
+ * in STOP_MODE).
+ */
+void gpio_pm_init_ain(void);
+#endif
+
 #ifdef MODULE_PERIPH_DMA
 /**
  * @brief   DMA stream not defined

diff --git a/cpu/stm32_common/periph/gpio.c b/cpu/stm32_common/periph/gpio.c
@@ -257,6 +257,70 @@ void isr_exti(void)
 }
 #endif /* MODULE_PERIPH_GPIO_IRQ */
 
+
+#if defined(CPU_FAM_STM32F0) || defined(CPU_FAM_STM32F2) || \
+    defined(CPU_FAM_STM32F3) || defined(CPU_FAM_STM32F4) || \
+    defined(CPU_FAM_STM32F7) || defined(CPU_FAM_STM32L1)
+
+#define AHBENR_LOWER_MASK      (0x0000FFFF)
+#define AHBENR_UPPER_MASK      (0xFFFF0000)
+#define AHB1ENR_LOWER_MASK     (0x0000FFFF)
+
+#define STM32_CPU_MAX_GPIOS    (12U)
+
+void gpio_pm_init_ain(void)
+{
+    uint32_t ahb_gpio_clocks;
+
+    /* enable GPIO clock and save GPIO clock configuration */
+#if defined(CPU_FAM_STM32L1)
+    ahb_gpio_clocks = RCC->AHBENR & AHBENR_LOWER_MASK;
+    periph_clk_en(AHB, AHBENR_LOWER_MASK);
+#elif defined(CPU_FAM_STM32F3) || defined(CPU_FAM_STM32F0)
+    ahb_gpio_clocks = RCC->AHBENR & AHBENR_UPPER_MASK;
+    periph_clk_en(AHB, AHBENR_UPPER_MASK);
+#elif defined(CPU_FAM_STM32F2) || defined(CPU_FAM_STM32F4) || \
+      defined(CPU_FAM_STM32F7)
+    ahb_gpio_clocks = RCC->AHB1ENR & AHBENR_LOWER_MASK;
+    periph_clk_en(AHB1, AHB1ENR_LOWER_MASK);
+#endif
+    /* switch all GPIOs to AIN mode to minimize power consumption */
+    for (uint8_t i = 0; i < STM32_CPU_MAX_GPIOS; i++) {
+        GPIO_TypeDef *port;
+        port = (GPIO_TypeDef *)(GPIOA_BASE + i*(GPIOB_BASE - GPIOA_BASE));
+        if (IS_GPIO_ALL_INSTANCE(port)) {
+#if !defined (DISABLE_JTAG)
+            switch (i) {
+                /* preserve JTAG pins on PORTA and PORTB */
+                case 0:
+                    port->MODER = 0xABFFFFFF;
+                    break;
+                case 1:
+                    port->MODER = 0xFFFFFEBF;
+                    break;
+                default:
+                    port->MODER = 0xFFFFFFFF;
+                    break;
+            }
+#else
+            port->MODER = 0xFFFFFFFF;
+#endif
+        }
+        else {
+            break;
+        }
+    }
+    /* restore GPIO clock */
+#if defined(CPU_FAM_STM32L1)
+    periph_clk_en(AHB, ((RCC->AHBENR & ~((uint32_t)AHBENR_LOWER_MASK)) | ahb_gpio_clocks));
+#elif defined(CPU_FAM_STM32F3) || defined(CPU_FAM_STM32F0)
+    periph_clk_en(AHB, ((RCC->AHBENR & ~((uint32_t)AHBENR_UPPER_MASK)) | ahb_gpio_clocks));
+#elif defined(CPU_FAM_STM32F2) || defined(CPU_FAM_STM32F4) || \
+      defined(CPU_FAM_STM32F7)
+    periph_clk_en(AHB1, ((RCC->AHB1ENR & ~((uint32_t)AHB1ENR_LOWER_MASK)) | ahb_gpio_clocks));
+#endif
+}
+#endif
 #else
 typedef int dont_be_pedantic;
 #endif