Subversion Repositories neorv32

// #################################################################################################
// # << NEORV32: neorv32_gpio.c - General Purpose Input/Output Port HW Driver (Source) >>          #
// # ********************************************************************************************* #
// # BSD 3-Clause License                                                                          #
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// # Copyright (c) 2021, Stephan Nolting. All rights reserved.                                     #
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// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #
// #################################################################################################
 
 
/**********************************************************************//**
 * @file neorv32_gpio.c
 * @author Stephan Nolting
 * @brief General purpose input/output port unit (GPIO) HW driver source file.
 *
 * @note These functions should only be used if the GPIO unit was synthesized (IO_GPIO_EN = true).
 **************************************************************************/
 
#include "neorv32.h"
#include "neorv32_gpio.h"
 
 
/**********************************************************************//**
 * Check if GPIO unit was synthesized.
 *
 * @return 0 if GPIO was not synthesized, 1 if GPIO is available.
 **************************************************************************/
int neorv32_gpio_available(void) {
 
  if (SYSINFO_FEATURES & (1 << SYSINFO_FEATURES_IO_GPIO)) {
    return 1;
  }
  else {
    return 0;
  }
}
 
 
/**********************************************************************//**
 * Set single pin of GPIO's output port.
 *
 * @param[in] pin Output pin number to be set (0..31).
 **************************************************************************/
void neorv32_gpio_pin_set(uint8_t pin) {
 
  pin &= 0x1f;
  GPIO_OUTPUT = GPIO_OUTPUT | (uint32_t)(1 << pin);
}
 
 
/**********************************************************************//**
 * Clear single pin of GPIO's output port.
 *
 * @param[in] pin Output pin number to be cleared (0..31).
 **************************************************************************/
void neorv32_gpio_pin_clr(uint8_t pin) {
 
  pin &= 0x1f;
  GPIO_OUTPUT = GPIO_OUTPUT & ~((uint32_t)(1 << pin));
}
 
 
/**********************************************************************//**
 * Toggle single pin of GPIO's output port.
 *
 * @param[in] pin Output pin number to be toggled (0..31).
 **************************************************************************/
void neorv32_gpio_pin_toggle(uint8_t pin) {
 
  pin &= 0x1f;
  GPIO_OUTPUT = GPIO_OUTPUT ^ (uint32_t)(1 << pin);
}
 
 
/**********************************************************************//**
 * Get single pin of GPIO's input port.
 *
 * @param[in] pin Input pin to be read (0..31).
 * @return uint32_t: =0 if pin is low, !=0 if pin is high.
 **************************************************************************/
uint32_t neorv32_gpio_pin_get(uint8_t pin) {
 
  pin &= 0x1f;
  return GPIO_INPUT & (uint32_t)(1 << pin);
}
 
 
/**********************************************************************//**
 * Set complete GPIO output port.
 *
 * @param[in] port_data New output port value (32-bit).
 **************************************************************************/
void neorv32_gpio_port_set(uint32_t port_data) {
 
  GPIO_OUTPUT = port_data;
}
 
 
/**********************************************************************//**
 * Get complete GPIO input port.
 *
 * @return Current input port state (32-bit).
 **************************************************************************/
uint32_t neorv32_gpio_port_get(void) {
 
  return GPIO_INPUT;
}
 
 
/**********************************************************************//**
 * Configure pin-change IRQ mask for input pins.
 *
 * @note The pin-change IRQ will trigger on any transition (rising and falling edge) for any enabled input pin.
 *
 * @param[in] pin_sel Mask to select which input pins can cause a pin-change IRQ (32-bit), 1 = pin enabled.
 **************************************************************************/
void neorv32_gpio_pin_change_config(uint32_t pin_sel) {
 
  GPIO_INPUT = pin_sel;
}