| /* |
| * 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])); |
| } |
| } |