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#include "main.h"
#include <furi-hal.h>
#include <furi.h>
#define SD_DUMMY_BYTE 0xFF
const uint32_t SpiTimeout = 1000;
uint8_t SD_IO_WriteByte(uint8_t Data);
static const FuriHalSpiDevice* sd_spi_dev = &furi_hal_spi_devices[FuriHalSpiDeviceIdSdCardFast];
/******************************************************************************
BUS OPERATIONS
*******************************************************************************/
/**
* @brief SPI Write byte(s) to device
* @param DataIn: Pointer to data buffer to write
* @param DataOut: Pointer to data buffer for read data
* @param DataLength: number of bytes to write
* @retval None
*/
static void SPIx_WriteReadData(const uint8_t* DataIn, uint8_t* DataOut, uint16_t DataLength) {
furi_check(furi_hal_spi_bus_trx(sd_spi_dev->bus, (uint8_t*)DataIn, DataOut, DataLength, SpiTimeout));
}
/**
* @brief SPI Write a byte to device
* @param Value: value to be written
* @retval None
*/
__attribute__((unused)) static void SPIx_Write(uint8_t Value) {
furi_check(furi_hal_spi_bus_tx(sd_spi_dev->bus, (uint8_t*)&Value, 1, SpiTimeout));
}
/******************************************************************************
LINK OPERATIONS
*******************************************************************************/
/********************************* LINK SD ************************************/
/**
* @brief Initialize the SD Card and put it into StandBy State (Ready for
* data transfer).
* @retval None
*/
void SD_IO_Init(void) {
uint8_t counter = 0;
/* SD chip select high */
hal_gpio_write(sd_spi_dev->chip_select, true);
delay_us(10);
/* Send dummy byte 0xFF, 10 times with CS high */
/* Rise CS and MOSI for 80 clocks cycles */
for(counter = 0; counter <= 200; counter++) {
/* Send dummy byte 0xFF */
SD_IO_WriteByte(SD_DUMMY_BYTE);
}
}
/**
* @brief Set SD interface Chip Select state
* @param val: 0 (low) or 1 (high) state
* @retval None
*/
void SD_IO_CSState(uint8_t val) {
/* Some SD Cards are prone to fail if CLK-ed too soon after CS transition. Worst case found: 8us */
if(val == 1) {
delay_us(10); // Exit guard time for some SD cards
hal_gpio_write(sd_spi_dev->chip_select, true);
} else {
hal_gpio_write(sd_spi_dev->chip_select, false);
delay_us(10); // Entry guard time for some SD cards
}
}
/**
* @brief Write byte(s) on the SD
* @param DataIn: Pointer to data buffer to write
* @param DataOut: Pointer to data buffer for read data
* @param DataLength: number of bytes to write
* @retval None
*/
void SD_IO_WriteReadData(const uint8_t* DataIn, uint8_t* DataOut, uint16_t DataLength) {
/* Send the byte */
SPIx_WriteReadData(DataIn, DataOut, DataLength);
}
/**
* @brief Write a byte on the SD.
* @param Data: byte to send.
* @retval Data written
*/
uint8_t SD_IO_WriteByte(uint8_t Data) {
uint8_t tmp;
/* Send the byte */
SPIx_WriteReadData(&Data, &tmp, 1);
return tmp;
}
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