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#include "sd_mmc.h"
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#include "sd_mmc_intf.h"
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#include <assert.h>
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// Functions used to interact with the SD card
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static sd_mmc_err_t sd_mmc_power_up_sequence();
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static sd_mmc_err_t sd_mmc_idle_sequence();
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static sd_mmc_err_t sd_mmc_if_sequence();
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static sd_mmc_err_t sd_mmc_read_ocr(uint8_t* res);
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static sd_mmc_err_t sd_mmc_read_res1(uint8_t* res1);
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static sd_mmc_err_t sd_mmc_read_res7(uint8_t* res7);
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static sd_mmc_err_t sd_mmc_read_res3(uint8_t* res3);
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static bool sd_mmc_check_cd(void);
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static void sd_mmc_send_clock(void);
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// Functions used for debugging
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static void sd_mmc_print_err(sd_mmc_err_t err);
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static void sd_mmc_print_res1(uint8_t res);
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static void sd_mmc_print_res7(const uint8_t* const res);
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static void sd_mmc_print_res3(const uint8_t* const res);
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sd_mmc_err_t sd_mmc_init(void)
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{
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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uint8_t ocr[5];
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do
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{
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// Hardware initialize
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if(0 != SD_MMC_INTF_INIT())
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{
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ret = SD_MMC_INIT_FAILURE;
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break;
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}
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// Power up sd card sequence
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if((ret = sd_mmc_power_up_sequence()) != SD_MMC_SUCCESS)
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{
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break;
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}
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// go idle
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if((ret = sd_mmc_idle_sequence()) != SD_MMC_SUCCESS)
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{
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break;
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}
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// interface sequence
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if((ret = sd_mmc_if_sequence()) != SD_MMC_SUCCESS)
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{
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break;
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}
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// read operation conditions register
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if((ret = sd_mmc_read_ocr(ocr)) != SD_MMC_SUCCESS)
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{
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break;
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}
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}while(0);
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if(ret != SD_MMC_SUCCESS)
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{
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printf("Error initializing SD Card: ");
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sd_mmc_print_err(ret);
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}
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return ret;
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}
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sd_mmc_err_t sd_mmc_deselect(uint8_t slot)
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{
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UNUSED(slot);
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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uint8_t dummy = 0xFF;
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SD_MMC_INTF_WRITE(&dummy, 1);
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SD_MMC_INTF_DESELECT_DEVICE();
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SD_MMC_INTF_WRITE(&dummy, 1);
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return ret;
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}
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sd_mmc_err_t sd_mmc_select(uint8_t slot, uint32_t clock, uint8_t bus_width, bool high_speed)
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{
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UNUSED(slot);
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UNUSED(clock);
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UNUSED(bus_width);
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UNUSED(high_speed);
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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uint8_t dummy = 0xFF;
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SD_MMC_INTF_WRITE(&dummy, 1);
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SD_MMC_INTF_SELECT_DEVICE();
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SD_MMC_INTF_WRITE(&dummy, 1);
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return ret;
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}
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sd_mmc_err_t sd_mmc_send_command(uint8_t cmd, uint32_t arg, uint8_t crc)
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{
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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uint8_t bytes[6];
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bytes[0] = cmd | 0x40;
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bytes[1] = ((uint8_t)(arg >> 24));
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bytes[2] = ((uint8_t)(arg >> 16));
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bytes[3] = ((uint8_t)(arg >> 8));
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bytes[4] = ((uint8_t)(arg));
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bytes[5] = crc | 0x01;
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if(6 != SD_MMC_INTF_WRITE(bytes, 6))
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{
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ret = SD_MMC_ERR_COMM;
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}
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return ret;
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}
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sd_mmc_err_t sd_mmc_read_res1(uint8_t* byte)
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{
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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uint8_t i = 0;
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do
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{
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i++;
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SD_MMC_INTF_READ(byte, 1);
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}while(i <= 8 && *byte == 0xFF);
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if(*byte == 0xFF)
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{
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return SD_MMC_TIMEOUT;
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}
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return ret;
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}
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sd_mmc_err_t sd_mmc_read_res7(uint8_t* res7)
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{
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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do
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{
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if(5 != SD_MMC_INTF_READ(res7, 5))
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{
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ret = SD_MMC_ERR_COMM;
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break;
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}
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printf("hi");
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if(res7[0] > 1)
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{
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// handle this error better later
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printf("res7: 0x%02x\n", res7[0]);
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perr("res7 > 1...");
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ret = SD_MMC_ERR_COMM;
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break;
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}
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}while(0);
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return ret;
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}
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sd_mmc_err_t sd_mmc_read_res3(uint8_t* res3)
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{
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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do
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{
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if(5 != SD_MMC_INTF_READ(res3, 5))
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{
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ret = SD_MMC_ERR_COMM;
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break;
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}
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if(res3[0] > 1)
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{
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// handle this error better later
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ret = SD_MMC_ERR_COMM;
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break;
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}
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}while(0);
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return ret;
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}
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sd_mmc_err_t sd_mmc_power_up_sequence()
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{
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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// power up sequence
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delay_ms(1);
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sd_mmc_send_clock();
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return ret;
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}
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sd_mmc_err_t sd_mmc_idle_sequence()
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{
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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uint8_t res1 = 0xFF;
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sd_mmc_select(0, 0, 0, false);
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do
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{
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sd_mmc_select(0, 0, 0, true);
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if((ret = sd_mmc_send_command(CMD0, CMD0_ARG, CMD0_CRC)) != SD_MMC_SUCCESS)
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{
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break;
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}
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if((ret = sd_mmc_read_res1(&res1)) != SD_MMC_SUCCESS)
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{
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break;
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}
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sd_mmc_print_res1(res1);
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}while(0);
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sd_mmc_deselect(0);
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return ret;
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}
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sd_mmc_err_t sd_mmc_if_sequence()
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{
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sd_mmc_err_t ret = SD_MMC_SUCCESS;
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uint8_t res7[5];
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sd_mmc_select(0, 0, 0, false);
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do
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{
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if((ret = sd_mmc_send_command(CMD8, CMD8_ARG, CMD8_CRC)) != SD_MMC_SUCCESS)
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{
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break;
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}
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if((ret = sd_mmc_read_res7(res7)) != SD_MMC_SUCCESS)
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{
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break;
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}
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sd_mmc_print_res7(res7);
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}while(0);
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sd_mmc_deselect(0);
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return ret;
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}
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void sd_mmc_print_err(sd_mmc_err_t err)
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{
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switch(err)
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{
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case SD_MMC_SUCCESS:
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{
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printf("%s", "SD_MMC_SUCCESS\n");
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}break;
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case SD_MMC_FAILURE:
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{
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printf("%s", "SD_MMC_FAILURE\n");
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}break;
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case SD_MMC_INIT_ONGOING:
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{
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printf("%s", "SD_MMC_INIT_ONGOING\n");
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}break;
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case SD_MMC_ERR_NO_CARD:
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{
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printf("%s", "SD_MMC_ERR_NO_CARD\n");
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}
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case SD_MMC_ERR_UNUSABLE:
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{
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printf("%s", "SD_MMC_UNUSABLE\n");
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}break;
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case SD_MMC_ERR_SLOT:
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{
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printf("%s", "SD_MMC_ERR_SLOT\n");
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}break;
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case SD_MMC_ERR_COMM:
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{
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printf("%s", "SD_MMC_ERR_COMM\n");
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}break;
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case SD_MMC_ERR_PARAM:
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{
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printf("%s", "SD_MMC_ERR_PARAM\n");
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}break;
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case SD_MMC_ERR_WP:
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{
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printf("%s", "SD_MMC_ERR_WP\n");
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}break;
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case SD_MMC_INIT_FAILURE:
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{
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printf("%s", "SD_MMC_INIT_FAILURE\n");
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}break;
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case SD_MMC_TIMEOUT:
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{
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printf("%s", "SD_MMC_TIMEOUT\n");
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}break;
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default:
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{
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printf("%s", "UNKNOWN ERROR");
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}
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}
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}
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void sd_mmc_print_res1(uint8_t res)
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{
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printf("RES1: 0x%02x\n", res);
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if(res & 0b10000000)
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{ printf("\tError: MSB = 1\r\n"); return; }
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if(res == 0)
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{ printf("\tCard Ready\r\n"); return; }
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if(PARAM_ERROR(res))
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printf("\tParameter Error\r\n");
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if(ADDR_ERROR(res))
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printf("\tAddress Error\r\n");
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if(ERASE_SEQ_ERROR(res))
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printf("\tErase Sequence Error\r\n");
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if(CRC_ERROR(res))
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printf("\tCRC Error\r\n");
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if(ILLEGAL_CMD(res))
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printf("\tIllegal Command\r\n");
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if(ERASE_RESET(res))
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printf("\tErase Reset Error\r\n");
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if(IN_IDLE(res))
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printf("\tIn Idle State\r\n");
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}
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void sd_mmc_print_res7(const uint8_t* const res)
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{
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sd_mmc_print_res1(res[0]);
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if(res[0] > 1) return;
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printf("\tCommand Version: 0x%02x\n", CMD_VER(res[1]));
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printf("\tVoltage Accepted: %s\n",
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(res[3] == VOLTAGE_ACC_27_33) ? "2.7-3.6V"
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: (res[3] == VOLTAGE_ACC_LOW) ? "LOW VOLTAGE"
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: (res[3] == VOLTAGE_ACC_RES1 || res[3] == VOLTAGE_ACC_RES2) ? "RESERVED"
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: "NOT DEFINED");
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printf("\tEcho: 0x%02x\n", res[4]);
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}
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void sd_mmc_print_res3(const uint8_t* const res)
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{
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sd_mmc_print_res1(res[0]);
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if(res[0] > 1) return;
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printf("\tCard Power Up Status: 0x%02x\n", res[1]);
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if(POWER_UP_STATUS(res[1]))
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{
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printf("READY\n");
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printf("\tCCS Status: %d\n", CCS_VAL(res[1]) ? 1 : 0);
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}
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else
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{
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printf("BUSY\n");
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}
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printf("\tVDD Window: ");
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if(VDD_2728(res[3])) printf("2.7-2.8, ");
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if(VDD_2829(res[2])) printf("2.8-2.9, ");
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if(VDD_2930(res[2])) printf("2.9-3.0, ");
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if(VDD_3031(res[2])) printf("3.0-3.1, ");
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if(VDD_3132(res[2])) printf("3.1-3.2, ");
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if(VDD_3233(res[2])) printf("3.2-3.3, ");
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if(VDD_3334(res[2])) printf("3.3-3.4, ");
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if(VDD_3435(res[2])) printf("3.4-3.5, ");
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if(VDD_3536(res[2])) printf("3.5-3.6");
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printf("\n");
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}
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bool sd_mmc_check_cd(void)
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{
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switch(SD_MMC_CD_MODE)
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{
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case SD_MMC_CD_MODE_UNUSED:
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{
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// Always assume the card is detected since we aren't using this function
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return true;
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}break;
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case SD_MMC_CD_MODE_SYNC:
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{
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return SD_MMC_INTF_CHECK_CD();
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}break;
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case SD_MMC_CD_MODE_ASYNC:
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{
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// Unimplemented
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return false;
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}break;
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default:
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{
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return false;
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}
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}
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return false;
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}
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void sd_mmc_send_clock()
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{
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uint8_t i;
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uint8_t dummy = 0xFF;
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for(i = 0; i < 10; i++)
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{
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SD_MMC_INTF_WRITE(&dummy, 1);
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}
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}
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sd_mmc_err_t sd_mmc_read_ocr(uint8_t* res)
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|
{
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|
sd_mmc_err_t ret = SD_MMC_SUCCESS;
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sd_mmc_select(0, 0, 0, false);
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do
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|
{
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if((ret = sd_mmc_send_command(CMD58, CMD58_ARG, CMD58_CRC)) != SD_MMC_SUCCESS)
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{
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break;
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}
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if((ret = sd_mmc_read_res3(res)) != SD_MMC_SUCCESS)
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|
{
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|
break;
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}
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|
sd_mmc_print_res3(res);
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|
|
}while(0);
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|
|
sd_mmc_deselect(0);
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|
|
return ret;
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}
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