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mbed-os/targets/TARGET_STM/TARGET_STM32F1/pinmap.c

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/* 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));
}
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