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- #include <stdint.h>
- #include "nrf.h"
- #include "nrf_delay.h"
- #include "sdio.h"
- #include "nrf_gpio.h"
- #include "sdio_config.h"
- #define SDIO_CLOCK_HIGH() do { NRF_GPIO->OUTSET = (1UL << SDIO_CONFIG_CLOCK_PIN_NUMBER); } while (0)
- #define SDIO_CLOCK_LOW() do { NRF_GPIO->OUTCLR = (1UL << SDIO_CONFIG_CLOCK_PIN_NUMBER); } while (0)
- #define SDIO_DATA_HIGH() do { NRF_GPIO->OUTSET = (1UL << SDIO_CONFIG_DATA_PIN_NUMBER); } while (0)
- #define SDIO_DATA_LOW() do { NRF_GPIO->OUTCLR = (1UL << SDIO_CONFIG_DATA_PIN_NUMBER); } while (0)
- #define SDIO_DATA_OUTPUT() do { NRF_GPIO->DIRSET = (1UL << SDIO_CONFIG_DATA_PIN_NUMBER); } while (0)
- #define SDIO_CLOCK_OUTPUT() do { NRF_GPIO->DIRSET = (1UL << SDIO_CONFIG_CLOCK_PIN_NUMBER); } while (0)
- #define SDIO_DATA_INPUT() do { \
- nrf_gpio_cfg_input(25, NRF_GPIO_PIN_NOPULL); \
- } while (0)
- #define SDIO_DATA_READ() ((NRF_GPIO->IN >> SDIO_CONFIG_DATA_PIN_NUMBER) & 0x1UL)
- #define SDIO_CLOCK_READ() ((NRF_GPIO->IN >> SDIO_CONFIG_CLOCK_PIN_NUMBER) & 0x1UL)
- #define SDIO_DELAY() nrf_delay_us(10)
- void sdio_init(void)
- {
- SDIO_CLOCK_HIGH();
- SDIO_DATA_HIGH();
- SDIO_CLOCK_OUTPUT();
- SDIO_DATA_INPUT();
-
- for (uint_fast8_t i = 16; i--;)
- {
- SDIO_DELAY();
- SDIO_CLOCK_LOW();
- SDIO_DELAY();
- SDIO_CLOCK_HIGH();
- SDIO_DELAY();
- if (SDIO_DATA_READ())
- {
- break;
- }
- }
- for (uint_fast8_t i = 5; i--;)
- {
- SDIO_DELAY();
- SDIO_CLOCK_LOW();
- SDIO_DELAY();
- SDIO_CLOCK_HIGH();
- }
- SDIO_DATA_OUTPUT();
- SDIO_DATA_HIGH();
- SDIO_DELAY();
- }
- uint8_t sdio_read_byte(uint8_t address)
- {
- uint8_t data_byte = 0;
- SDIO_DATA_OUTPUT();
- for (uint_fast8_t i = 8; i--;)
- {
- SDIO_DELAY();
- SDIO_CLOCK_LOW();
- if (address & (1U << i))
- {
- SDIO_DATA_HIGH();
- }
- else
- {
- SDIO_DATA_LOW();
- }
- SDIO_DELAY();
- SDIO_CLOCK_HIGH();
- }
- nrf_delay_us(20);
- SDIO_DATA_INPUT();
- for (uint_fast8_t i = 8; i--;)
- {
- SDIO_CLOCK_LOW();
- SDIO_DELAY();
- SDIO_CLOCK_HIGH();
- SDIO_DELAY();
- data_byte |= (uint8_t)(SDIO_DATA_READ() << i);
- }
- SDIO_DATA_HIGH();
- SDIO_DATA_OUTPUT();
- SDIO_DELAY();
- return data_byte;
- }
- void sdio_read_burst(uint8_t * target_buffer, uint8_t target_buffer_size)
- {
- uint_fast8_t address = 0x63;
- SDIO_DATA_OUTPUT();
- for (uint_fast8_t bit_index=8; bit_index--;)
- {
- SDIO_CLOCK_LOW();
- if (address & (1U << bit_index))
- {
- SDIO_DATA_HIGH();
- }
- else
- {
- SDIO_DATA_LOW();
- }
- SDIO_CLOCK_HIGH();
- }
- SDIO_DATA_INPUT();
- for (uint_fast8_t target_buffer_index = 0; target_buffer_index < target_buffer_size; target_buffer_index++)
- {
- target_buffer[target_buffer_index] = 0;
- for (uint_fast8_t bit_index = 8; bit_index--;)
- {
- SDIO_CLOCK_LOW();
- SDIO_CLOCK_HIGH();
- target_buffer[target_buffer_index] |= (uint8_t)(SDIO_DATA_READ() << bit_index);
- }
- }
- }
- void sdio_write_byte(uint8_t address, uint8_t data_byte)
- {
-
- address |= 0x80;
- SDIO_DATA_OUTPUT();
- for (uint_fast8_t i = 8; i--;)
- {
- SDIO_DELAY();
- SDIO_CLOCK_LOW();
- if (address & (1U << i))
- {
- SDIO_DATA_HIGH();
- }
- else
- {
- SDIO_DATA_LOW();
- }
- SDIO_DELAY();
- SDIO_CLOCK_HIGH();
- }
- SDIO_DELAY();
- for (uint_fast8_t i = 8; i--;)
- {
- SDIO_CLOCK_LOW();
- if (data_byte & (1U << i))
- {
- SDIO_DATA_HIGH();
- }
- else
- {
- SDIO_DATA_LOW();
- }
- SDIO_DELAY();
- SDIO_CLOCK_HIGH();
- SDIO_DELAY();
- }
- SDIO_DATA_HIGH();
- SDIO_DELAY();
- }
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