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