EBIKE-FreeRTOS/Common/drivers/Atmel/at91lib/peripherals/pio/pio.c

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2024-04-14 18:38:39 +08:00
/* ----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support
* ----------------------------------------------------------------------------
* Copyright (c) 2008, Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
* ----------------------------------------------------------------------------
*/
//------------------------------------------------------------------------------
// Headers
//------------------------------------------------------------------------------
#include "pio.h"
#include <board.h>
//------------------------------------------------------------------------------
// Internal definitions
//------------------------------------------------------------------------------
/// \internal Returns the current value of a register.
#define READ(peripheral, register) (peripheral->register)
/// \internal Modifies the current value of a register.
#define WRITE(peripheral, register, value) (peripheral->register = value)
//------------------------------------------------------------------------------
// Internal functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// Configures one or more pin(s) of a PIO controller as being controlled by
/// peripheral A. Optionally, the corresponding internal pull-up(s) can be
/// enabled.
/// \param pio Pointer to a PIO controller.
/// \param mask Bitmask of one or more pin(s) to configure.
/// \param enablePullUp Indicates if the pin(s) internal pull-up shall be
/// configured.
//------------------------------------------------------------------------------
static void PIO_SetPeripheralA(AT91S_PIO *pio,
unsigned int mask,
unsigned char enablePullUp)
{
// Disable interrupts on the pin(s)
WRITE(pio, PIO_IDR, mask);
// Enable the pull-up(s) if necessary
if (enablePullUp) {
WRITE(pio, PIO_PPUER, mask);
}
else {
WRITE(pio, PIO_PPUDR, mask);
}
// Configure pin
WRITE(pio, PIO_ASR, mask);
WRITE(pio, PIO_PDR, mask);
}
//------------------------------------------------------------------------------
/// Configures one or more pin(s) of a PIO controller as being controlled by
/// peripheral A. Optionally, the corresponding internal pull-up(s) can be
/// enabled.
/// \param pio Pointer to a PIO controller.
/// \param mask Bitmask of one or more pin(s) to configure.
/// \param enablePullUp Indicates if the pin(s) internal pull-up shall be
/// configured.
//------------------------------------------------------------------------------
static void PIO_SetPeripheralB(AT91S_PIO *pio,
unsigned int mask,
unsigned char enablePullUp)
{
// Disable interrupts on the pin(s)
WRITE(pio, PIO_IDR, mask);
// Enable the pull-up(s) if necessary
if (enablePullUp) {
WRITE(pio, PIO_PPUER, mask);
}
else {
WRITE(pio, PIO_PPUDR, mask);
}
// Configure pin
WRITE(pio, PIO_BSR, mask);
WRITE(pio, PIO_PDR, mask);
}
//------------------------------------------------------------------------------
/// Configures one or more pin(s) or a PIO controller as inputs. Optionally,
/// the corresponding internal pull-up(s) and glitch filter(s) can be
/// enabled.
/// \param pio Pointer to a PIO controller.
/// \param mask Bitmask indicating which pin(s) to configure as input(s).
/// \param enablePullUp Indicates if the internal pull-up(s) must be enabled.
/// \param enableFilter Indicates if the glitch filter(s) must be enabled.
//------------------------------------------------------------------------------
static void PIO_SetInput(AT91S_PIO *pio,
unsigned int mask,
unsigned char enablePullUp,
unsigned char enableFilter)
{
// Disable interrupts
WRITE(pio, PIO_IDR, mask);
// Enable pull-up(s) if necessary
if (enablePullUp) {
WRITE(pio, PIO_PPUER, mask);
}
else {
WRITE(pio, PIO_PPUDR, mask);
}
// Enable filter(s) if necessary
if (enableFilter) {
WRITE(pio, PIO_IFER, mask);
}
else {
WRITE(pio, PIO_IFDR, mask);
}
// Configure pin as input
WRITE(pio, PIO_ODR, mask);
WRITE(pio, PIO_PER, mask);
}
//------------------------------------------------------------------------------
/// Configures one or more pin(s) of a PIO controller as outputs, with the
/// given default value. Optionally, the multi-drive feature can be enabled
/// on the pin(s).
/// \param pio Pointer to a PIO controller.
/// \param mask Bitmask indicating which pin(s) to configure.
/// \param defaultValue Default level on the pin(s).
/// \param enableMultiDrive Indicates if the pin(s) shall be configured as
/// open-drain.
/// \param enablePullUp Indicates if the pin shall have its pull-up activated.
//------------------------------------------------------------------------------
static void PIO_SetOutput(AT91S_PIO *pio,
unsigned int mask,
unsigned char defaultValue,
unsigned char enableMultiDrive,
unsigned char enablePullUp)
{
// Disable interrupts
WRITE(pio, PIO_IDR, mask);
// Enable pull-up(s) if necessary
if (enablePullUp) {
WRITE(pio, PIO_PPUER, mask);
}
else {
WRITE(pio, PIO_PPUDR, mask);
}
// Enable multi-drive if necessary
if (enableMultiDrive) {
WRITE(pio, PIO_MDER, mask);
}
else {
WRITE(pio, PIO_MDDR, mask);
}
// Set default value
if (defaultValue) {
WRITE(pio, PIO_SODR, mask);
}
else {
WRITE(pio, PIO_CODR, mask);
}
// Configure pin(s) as output(s)
WRITE(pio, PIO_OER, mask);
WRITE(pio, PIO_PER, mask);
}
//------------------------------------------------------------------------------
// Exported functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// Configures a list of Pin instances, which can either hold a single pin or a
/// group of pins, depending on the mask value; all pins are configured by this
/// function.
/// Returns 1 if the configuration has been performed successfully; otherwise 0.
/// \param list Pointer to a list of Pin instances.
/// \param size Size of the Pin list (see <PIO_LISTSIZE>).
//------------------------------------------------------------------------------
unsigned char PIO_Configure(const Pin *list, unsigned int size)
{
// Configure pins
while (size > 0) {
switch (list->type) {
case PIO_PERIPH_A:
PIO_SetPeripheralA(list->pio,
list->mask,
(list->attribute & PIO_PULLUP) ? 1 : 0);
break;
case PIO_PERIPH_B:
PIO_SetPeripheralB(list->pio,
list->mask,
(list->attribute & PIO_PULLUP) ? 1 : 0);
break;
case PIO_INPUT:
AT91C_BASE_PMC->PMC_PCER = 1 << list->id;
PIO_SetInput(list->pio,
list->mask,
(list->attribute & PIO_PULLUP) ? 1 : 0,
(list->attribute & PIO_DEGLITCH)? 1 : 0);
break;
case PIO_OUTPUT_0:
case PIO_OUTPUT_1:
PIO_SetOutput(list->pio,
list->mask,
(list->type == PIO_OUTPUT_1),
(list->attribute & PIO_OPENDRAIN) ? 1 : 0,
(list->attribute & PIO_PULLUP) ? 1 : 0);
break;
default: return 0;
}
list++;
size--;
}
return 1;
}
//------------------------------------------------------------------------------
/// Sets a high output level on one or more pin(s) (if configured as output(s)).
/// \param pin Pointer to a Pin instance describing one or more pins.
//------------------------------------------------------------------------------
void PIO_Set(const Pin *pin)
{
WRITE(pin->pio, PIO_SODR, pin->mask);
}
//------------------------------------------------------------------------------
/// Sets a low output level on one or more pin(s) (if configured as output(s)).
/// \param pin Pointer to a Pin instance describing one or more pins.
//------------------------------------------------------------------------------
void PIO_Clear(const Pin *pin)
{
WRITE(pin->pio, PIO_CODR, pin->mask);
}
//------------------------------------------------------------------------------
/// Returns 1 if one or more PIO of the given Pin instance currently have a high
/// level; otherwise returns 0.
/// \param pin Pointer to a Pin instance describing one or more pins.
//------------------------------------------------------------------------------
unsigned char PIO_Get(const Pin *pin)
{
unsigned int reg;
if ((pin->type == PIO_OUTPUT_0) || (pin->type == PIO_OUTPUT_1)) {
reg = READ(pin->pio, PIO_ODSR);
}
else {
reg = READ(pin->pio, PIO_PDSR);
}
if ((reg & pin->mask) == 0) {
return 0;
}
else {
return 1;
}
}
//------------------------------------------------------------------------------
/// Returns 1 if one or more PIO of the given Pin data to be driven on the I/O line
/// level; otherwise returns 0.
/// \param pin Pointer to a Pin instance describing one or more pins.
//------------------------------------------------------------------------------
unsigned char PIO_GetOutputDataStatus(const Pin *pin)
{
if ((READ(pin->pio, PIO_ODSR) & pin->mask) == 0) {
return 0;
}
else {
return 1;
}
}
//------------------------------------------------------------------------------
/// Returns the value of ISR for the PIO controller of the pin.
/// Reading this register acknoledges all the ITs.
/// \param pin Pointer to a Pin instance describing one or more pins.
//------------------------------------------------------------------------------
unsigned int PIO_GetISR(const Pin *pin)
{
return (READ(pin->pio, PIO_ISR));
}