245 lines
6.7 KiB
C
245 lines
6.7 KiB
C
/**
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* Copyright (c) 2009 - 2019, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <stdint.h>
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#include "nrf.h"
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#include "nrf_delay.h"
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#include "sdio.h"
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#include "nrf_gpio.h"
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#include "sdio_config.h"
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/*lint ++flb "Enter library region" */
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/*lint -e717 -save "Suppress do {} while (0) for these macros" */
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#define SDIO_CLOCK_HIGH() do { NRF_GPIO->OUTSET = (1UL << SDIO_CONFIG_CLOCK_PIN_NUMBER); } while (0) /*!< Pulls SCL line high */
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#define SDIO_CLOCK_LOW() do { NRF_GPIO->OUTCLR = (1UL << SDIO_CONFIG_CLOCK_PIN_NUMBER); } while (0) /*!< Pulls SCL line low */
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#define SDIO_DATA_HIGH() do { NRF_GPIO->OUTSET = (1UL << SDIO_CONFIG_DATA_PIN_NUMBER); } while (0) /*!< Pulls SDA line high */
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#define SDIO_DATA_LOW() do { NRF_GPIO->OUTCLR = (1UL << SDIO_CONFIG_DATA_PIN_NUMBER); } while (0) /*!< Pulls SDA line low */
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#define SDIO_DATA_OUTPUT() do { NRF_GPIO->DIRSET = (1UL << SDIO_CONFIG_DATA_PIN_NUMBER); } while (0) /*!< Configures SDA pin as output */
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#define SDIO_CLOCK_OUTPUT() do { NRF_GPIO->DIRSET = (1UL << SDIO_CONFIG_CLOCK_PIN_NUMBER); } while (0) /*!< Configures SCL pin as output */
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/*lint -restore */
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/*lint -emacro(845,SDIO_DATA_INPUT) // A zero has been given as right argument to operator '|'" */
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#define SDIO_DATA_INPUT() do { \
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nrf_gpio_cfg_input(25, NRF_GPIO_PIN_NOPULL); \
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} while (0)
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#define SDIO_DATA_READ() ((NRF_GPIO->IN >> SDIO_CONFIG_DATA_PIN_NUMBER) & 0x1UL) /*!< Reads current state of SDA */
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#define SDIO_CLOCK_READ() ((NRF_GPIO->IN >> SDIO_CONFIG_CLOCK_PIN_NUMBER) & 0x1UL) /*!< Reads current state of SCL */
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#define SDIO_DELAY() nrf_delay_us(10) /*!< Time to wait when pin states are changed. For fast-mode the delay can be zero and for standard-mode 4 us delay is sufficient. */
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void sdio_init(void)
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{
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SDIO_CLOCK_HIGH();
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SDIO_DATA_HIGH();
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SDIO_CLOCK_OUTPUT();
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SDIO_DATA_INPUT();
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// If slave is stuck in the middle of transfer, clock out bits until the slave ACKs the transfer
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for (uint_fast8_t i = 16; i--;)
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{
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SDIO_DELAY();
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SDIO_CLOCK_LOW();
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SDIO_DELAY();
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SDIO_CLOCK_HIGH();
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SDIO_DELAY();
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if (SDIO_DATA_READ())
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{
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break;
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}
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}
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for (uint_fast8_t i = 5; i--;)
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{
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SDIO_DELAY();
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SDIO_CLOCK_LOW();
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SDIO_DELAY();
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SDIO_CLOCK_HIGH();
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}
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SDIO_DATA_OUTPUT();
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SDIO_DATA_HIGH();
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SDIO_DELAY();
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}
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uint8_t sdio_read_byte(uint8_t address)
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{
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uint8_t data_byte = 0;
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SDIO_DATA_OUTPUT();
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for (uint_fast8_t i = 8; i--;)
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{
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SDIO_DELAY();
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SDIO_CLOCK_LOW();
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if (address & (1U << i))
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{
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SDIO_DATA_HIGH();
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}
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else
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{
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SDIO_DATA_LOW();
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}
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SDIO_DELAY();
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SDIO_CLOCK_HIGH();
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}
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nrf_delay_us(20);
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SDIO_DATA_INPUT();
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for (uint_fast8_t i = 8; i--;)
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{
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SDIO_CLOCK_LOW();
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SDIO_DELAY();
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SDIO_CLOCK_HIGH();
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SDIO_DELAY();
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data_byte |= (uint8_t)(SDIO_DATA_READ() << i);
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}
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SDIO_DATA_HIGH();
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SDIO_DATA_OUTPUT();
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SDIO_DELAY();
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return data_byte;
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}
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void sdio_read_burst(uint8_t * target_buffer, uint8_t target_buffer_size)
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{
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uint_fast8_t address = 0x63;
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SDIO_DATA_OUTPUT();
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for (uint_fast8_t bit_index=8; bit_index--;)
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{
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SDIO_CLOCK_LOW();
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if (address & (1U << bit_index))
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{
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SDIO_DATA_HIGH();
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}
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else
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{
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SDIO_DATA_LOW();
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}
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SDIO_CLOCK_HIGH();
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}
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SDIO_DATA_INPUT();
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for (uint_fast8_t target_buffer_index = 0; target_buffer_index < target_buffer_size; target_buffer_index++)
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{
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target_buffer[target_buffer_index] = 0;
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for (uint_fast8_t bit_index = 8; bit_index--;)
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{
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SDIO_CLOCK_LOW();
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SDIO_CLOCK_HIGH();
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target_buffer[target_buffer_index] |= (uint8_t)(SDIO_DATA_READ() << bit_index);
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}
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}
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}
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void sdio_write_byte(uint8_t address, uint8_t data_byte)
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{
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// Add write indication bit
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address |= 0x80;
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SDIO_DATA_OUTPUT();
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for (uint_fast8_t i = 8; i--;)
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{
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SDIO_DELAY();
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SDIO_CLOCK_LOW();
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if (address & (1U << i))
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{
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SDIO_DATA_HIGH();
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}
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else
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{
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SDIO_DATA_LOW();
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}
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SDIO_DELAY();
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SDIO_CLOCK_HIGH();
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}
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SDIO_DELAY();
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for (uint_fast8_t i = 8; i--;)
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{
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SDIO_CLOCK_LOW();
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if (data_byte & (1U << i))
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{
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SDIO_DATA_HIGH();
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}
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else
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{
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SDIO_DATA_LOW();
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}
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SDIO_DELAY();
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SDIO_CLOCK_HIGH();
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SDIO_DELAY();
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}
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SDIO_DATA_HIGH();
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SDIO_DELAY();
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}
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/*lint --flb "Leave library region" */
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