rt-thread/bsp/imxrt1052-evk/Libraries/drivers/fsl_kpp.c

193 lines
6.8 KiB
C

/*
* Copyright 2017 NXP
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* o 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.
*
* o Neither the name of the copyright holder 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 "fsl_kpp.h"
/*******************************************************************************
* Definitions
******************************************************************************/
#define KPP_KEYPAD_SCAN_TIMES (3U)
/*******************************************************************************
* Prototypes
******************************************************************************/
/*******************************************************************************
* Variables
******************************************************************************/
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
/*! @brief Pointers to SEMC clocks for each instance. */
static const clock_ip_name_t s_kppClock[FSL_FEATURE_SOC_KPP_COUNT] = KPP_CLOCKS;
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
/*! @brief Pointers to SEMC bases for each instance. */
static KPP_Type *const s_kppBases[] = KPP_BASE_PTRS;
/*! @brief Pointers to KPP IRQ number for each instance. */
static const IRQn_Type s_kppIrqs[] = KPP_IRQS;
/*******************************************************************************
* Code
******************************************************************************/
static uint32_t KPP_GetInstance(KPP_Type *base)
{
uint32_t instance;
/* Find the instance index from base address mappings. */
for (instance = 0; instance < ARRAY_SIZE(s_kppBases); instance++)
{
if (s_kppBases[instance] == base)
{
break;
}
}
assert(instance < ARRAY_SIZE(s_kppBases));
return instance;
}
static void KPP_Mdelay(uint64_t tickets)
{
while (tickets--)
{
__NOP();
}
}
void KPP_Init(KPP_Type *base, kpp_config_t *configure)
{
assert(configure);
uint32_t instance = KPP_GetInstance(base);
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
/* Un-gate sdram controller clock. */
CLOCK_EnableClock(s_kppClock[KPP_GetInstance(base)]);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
/* Clear all. */
base->KPSR &= ~(KPP_KPSR_KRIE_MASK | KPP_KPSR_KDIE_MASK);
/* Enable the keypad row and set the column strobe output to open drain. */
base->KPCR = KPP_KPCR_KRE(configure->activeRow);
base->KPDR = KPP_KPDR_KCD((uint8_t)~(configure->activeColumn));
base->KPCR |= KPP_KPCR_KCO(configure->activeColumn);
/* Set the input direction for row and output direction for column. */
base->KDDR = KPP_KDDR_KCDD(configure->activeColumn) | KPP_KDDR_KRDD((uint8_t)~(configure->activeRow));
/* Clear the status flag and enable the interrupt. */
base->KPSR =
KPP_KPSR_KPKR_MASK | KPP_KPSR_KPKD_MASK | KPP_KPSR_KDSC_MASK | configure->interrupt;
if (configure->interrupt)
{
/* Enable at the Interrupt */
EnableIRQ(s_kppIrqs[instance]);
}
}
void KPP_Deinit(KPP_Type *base)
{
/* Disable interrupts and disable all rows. */
base->KPSR &= ~(KPP_KPSR_KRIE_MASK | KPP_KPSR_KDIE_MASK);
base->KPCR = 0;
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
/* Disable KPP clock. */
CLOCK_DisableClock(s_kppClock[KPP_GetInstance(base)]);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
}
void KPP_keyPressScanning(KPP_Type *base, uint8_t *data, uint32_t clockSrc_Hz)
{
assert(data);
uint16_t kppKCO = base->KPCR & KPP_KPCR_KCO_MASK;
uint8_t columIndex = 0;
uint8_t activeColumn = (base->KPCR & KPP_KPCR_KCO_MASK) >> KPP_KPCR_KCO_SHIFT;
uint8_t times;
uint8_t rowData[KPP_KEYPAD_SCAN_TIMES][KPP_KEYPAD_COLUMNNUM_MAX];
bool press = false;
uint8_t column;
/* Initialize row data to zero. */
memset(&rowData[0][0], 0, sizeof(rowData));
/* Scanning. */
/* Configure the column data to 1 according to column numbers. */
base->KPDR = KPP_KPDR_KCD_MASK;
/* Configure column to totem pole for quick discharge of keypad capacitance. */
base->KPCR &= (uint16_t)(((uint16_t)~kppKCO) | KPP_KPCR_KRE_MASK);
/* Recover. */
base->KPCR |= kppKCO;
/* Three times scanning. */
for (times = 0; times < KPP_KEYPAD_SCAN_TIMES; times++)
{
for (columIndex = 0; columIndex < KPP_KEYPAD_COLUMNNUM_MAX; columIndex++)
{
column = activeColumn & (1U << columIndex);
if (column)
{
/* Set the single column line to 0. */
base->KPDR = KPP_KPDR_KCD(~(uint16_t)column);
/* Take 100us delays. */
KPP_Mdelay(clockSrc_Hz / 10000000);
/* Read row data. */
rowData[times][columIndex] = ~(base->KPDR & KPP_KPDR_KRD_MASK);
}
else
{
/* Read row data. */
rowData[times][columIndex] = 0;
}
}
}
/* Return all columns to 0 in preparation for standby mode. */
base->KPDR &= ~KPP_KPDR_KCD_MASK;
/* Check if three time scan data is the same. */
for (columIndex = 0; columIndex < KPP_KEYPAD_COLUMNNUM_MAX; columIndex++)
{
if ((uint8_t)(rowData[0][columIndex] & rowData[1][columIndex]) & rowData[2][columIndex])
{
press = true;
}
}
if (press)
{
memcpy((void *)data, &rowData[0][0], sizeof(rowData[0]));
}
else
{
memset((void *)data, 0, sizeof(rowData[0]));
}
}