Diff: targets/TARGET_STM/TARGET_STM32F1/pinmap.c

Revision:

149:156823d33999

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32F1/pinmap.c	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,247 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2014, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#include "mbed_assert.h"
+#include "pinmap.h"
+#include "PortNames.h"
+#include "mbed_error.h"
+
+// GPIO mode look-up table
+// Warning: the elements order must be the same as the one defined in PinNames.h
+static const uint32_t gpio_mode[13] = {
+    GPIO_MODE_INPUT,              //  0 = STM_MODE_INPUT
+    GPIO_MODE_OUTPUT_PP,          //  1 = STM_MODE_OUTPUT_PP
+    GPIO_MODE_OUTPUT_OD,          //  2 = STM_MODE_OUTPUT_OD
+    GPIO_MODE_AF_PP,              //  3 = STM_MODE_AF_PP
+    GPIO_MODE_AF_OD,              //  4 = STM_MODE_AF_OD
+    GPIO_MODE_ANALOG,             //  5 = STM_MODE_ANALOG
+    GPIO_MODE_IT_RISING,          //  6 = STM_MODE_IT_RISING
+    GPIO_MODE_IT_FALLING,         //  7 = STM_MODE_IT_FALLING
+    GPIO_MODE_IT_RISING_FALLING,  //  8 = STM_MODE_IT_RISING_FALLING
+    GPIO_MODE_EVT_RISING,         //  9 = STM_MODE_EVT_RISING
+    GPIO_MODE_EVT_FALLING,        // 10 = STM_MODE_EVT_FALLING
+    GPIO_MODE_EVT_RISING_FALLING, // 11 = STM_MODE_EVT_RISING_FALLING
+    0x10000000                    // 12 = STM_MODE_IT_EVT_RESET (not in STM32Cube HAL)
+};
+
+// Enable GPIO clock and return GPIO base address
+uint32_t Set_GPIO_Clock(uint32_t port_idx)
+{
+    uint32_t gpio_add = 0;
+    switch (port_idx) {
+        case PortA:
+            gpio_add = GPIOA_BASE;
+            __GPIOA_CLK_ENABLE();
+            break;
+        case PortB:
+            gpio_add = GPIOB_BASE;
+            __GPIOB_CLK_ENABLE();
+            break;
+        case PortC:
+            gpio_add = GPIOC_BASE;
+            __GPIOC_CLK_ENABLE();
+            break;
+        case PortD:
+            gpio_add = GPIOD_BASE;
+            __GPIOD_CLK_ENABLE();
+            break;
+        default:
+            error("Pinmap error: wrong port number.");
+            break;
+    }
+    return gpio_add;
+}
+
+/**
+ * Configure pin (input, output, alternate function or analog) + output speed + AF
+ */
+void pin_function(PinName pin, int data)
+{
+    MBED_ASSERT(pin != (PinName)NC);
+    // Get the pin informations
+    uint32_t mode  = STM_PIN_MODE(data);
+    uint32_t pupd  = STM_PIN_PUPD(data);
+    uint32_t afnum = STM_PIN_AFNUM(data);
+
+    uint32_t port_index = STM_PORT(pin);
+    uint32_t pin_index  = STM_PIN(pin);
+
+    // Enable GPIO clock
+    uint32_t gpio_add = Set_GPIO_Clock(port_index);
+    GPIO_TypeDef *gpio = (GPIO_TypeDef *)gpio_add;
+
+    // Enable AFIO clock
+    __HAL_RCC_AFIO_CLK_ENABLE();
+
+    // Configure Alternate Function
+    // Warning: Must be done before the GPIO is initialized
+    if (afnum > 0) {
+        switch (afnum) {
+            case 1: // Remap SPI1
+                __HAL_AFIO_REMAP_SPI1_ENABLE();
+                break;
+            case 2: // Remap I2C1
+                __HAL_AFIO_REMAP_I2C1_ENABLE();
+                break;
+            case 3: // Remap USART1
+                __HAL_AFIO_REMAP_USART1_ENABLE();
+                break;
+            case 4: // Remap USART2
+                __HAL_AFIO_REMAP_USART2_ENABLE();
+                break;
+            case 5: // Partial Remap USART3
+                __HAL_AFIO_REMAP_USART3_PARTIAL();
+                break;
+            case 6: // Partial Remap TIM1
+                __HAL_AFIO_REMAP_TIM1_PARTIAL();
+                break;
+            case 7: // Partial Remap TIM3
+                __HAL_AFIO_REMAP_TIM3_PARTIAL();
+                break;
+            case 8: // Full Remap TIM2
+                __HAL_AFIO_REMAP_TIM2_ENABLE();
+                break;
+            case 9: // Full Remap TIM3
+                __HAL_AFIO_REMAP_TIM3_ENABLE();
+                break;
+            default:
+                break;
+        }
+    }
+
+    // Configure GPIO
+    GPIO_InitTypeDef GPIO_InitStructure;
+    GPIO_InitStructure.Pin   = (uint32_t)(1 << pin_index);
+    GPIO_InitStructure.Mode  = gpio_mode[mode];
+    GPIO_InitStructure.Pull  = pupd;
+    GPIO_InitStructure.Speed = GPIO_SPEED_HIGH;
+    HAL_GPIO_Init(gpio, &GPIO_InitStructure);
+
+    // Disconnect JTAG-DP + SW-DP signals.
+    // Warning: Need to reconnect under reset
+    if ((pin == PA_13) || (pin == PA_14)) {
+        __HAL_AFIO_REMAP_SWJ_DISABLE(); // JTAG-DP Disabled and SW-DP Disabled
+    }
+    if ((pin == PA_15) || (pin == PB_3) || (pin == PB_4)) {
+        __HAL_AFIO_REMAP_SWJ_NOJTAG(); // JTAG-DP Disabled and SW-DP enabled
+    }
+}
+
+/**
+ * Configure pin pull-up/pull-down
+ */
+void pin_mode(PinName pin, PinMode mode)
+{
+    MBED_ASSERT(pin != (PinName)NC);
+
+    uint32_t port_index = STM_PORT(pin);
+    uint32_t pin_index  = STM_PIN(pin);
+    // Enable GPIO clock
+    uint32_t gpio_add = Set_GPIO_Clock(port_index);
+    GPIO_TypeDef *gpio = (GPIO_TypeDef *)gpio_add;
+    __IO uint32_t* gpio_reg_hl;//gpio register depends on bit index (high or low)
+    uint32_t shift;
+
+    if (pin_index < 8) {
+        shift = (pin_index * 4);
+        gpio_reg_hl = &(gpio->CRL);
+    } else {
+        shift = (pin_index % 8) * 4;
+        gpio_reg_hl = &(gpio->CRH);
+    }
+
+    // Configure open-drain and pull-up/down
+    switch (mode) {
+        case PullNone:
+            break;
+        case PullUp:
+        case PullDown:
+            // Set pull-up / pull-down for Input mode
+            if ((*gpio_reg_hl & (0x03 << shift)) == 0) { // MODE bits = Input mode
+                *gpio_reg_hl |= (0x08 << shift); // Set pull-up / pull-down
+                *gpio_reg_hl &= ~(0x04 << shift); // ENSURES GPIOx_CRL.CNFx.bit0 = 0
+            }
+            // Now it's time to setup properly if pullup or pulldown. This is done in ODR register:
+            // set pull-up => bit=1, set pull-down => bit = 0
+            if (mode == PullUp) {
+                gpio->ODR |= (0x01 << (pin_index)); // Set pull-up
+            } else{
+                gpio->ODR &= ~(0x01 << (pin_index)); // Set pull-down
+            }
+            break;
+        case OpenDrain:
+            // Set open-drain for Output mode (General Purpose or Alternate Function)
+            if ((*gpio_reg_hl & (0x03 << shift)) > 0) { // MODE bits = Output mode
+                *gpio_reg_hl |= (0x04 << shift); // Set open-drain
+            }
+            break;
+        default:
+            break;
+    }
+}
+
+/*  Internal function for setting the gpiomode/function
+ *  without changing Pull mode
+ */
+void pin_function_gpiomode(PinName pin, uint32_t gpiomode) {
+
+    /* Read current pull state from HW to avoid over-write*/
+    uint32_t port_index = STM_PORT(pin);
+    uint32_t pin_index  = STM_PIN(pin);
+    GPIO_TypeDef *gpio = (GPIO_TypeDef *) Set_GPIO_Clock(port_index);
+    uint32_t pull = PullNone;
+    __IO uint32_t* gpio_reg_hl;//gpio register depends on bit index (high or low)
+    uint32_t shift;
+
+    if (pin_index < 8) {
+        shift = (pin_index * 4);
+        gpio_reg_hl = &(gpio->CRL);
+    } else {
+        shift = (pin_index % 8) * 4;
+        gpio_reg_hl = &(gpio->CRH);
+    }
+
+    /*  Check if pull/pull down is active */
+    if ((!(*gpio_reg_hl & (0x03 << shift))) // input
+        && (!!(*gpio_reg_hl & (0x08 << shift))) // pull-up / down
+        && (!(*gpio_reg_hl & (0x04 << shift)))) { // GPIOx_CRL.CNFx.bit0 = 0
+        if (!!(gpio->ODR & (0x01 << pin_index))) {
+            pull = PullUp;
+        } else {
+            pull = PullDown;
+        }
+    } else { //output
+        if (!!(*gpio_reg_hl & (0x04 << shift))) { //open drain
+            pull = OpenDrain;
+        }
+    }
+
+    /* Then re-use global function for updating the mode part*/
+    pin_function(pin, STM_PIN_DATA(gpiomode, pull, 0));
+}