f1e71a9461
All of the SD card commands are moved into their own file, with functions sd_init, sd_get_rca, sd_select_card, sd_get_status, and sd_readblock. The FAT functions are movied into fat.c and give functions fat_init and fat_read. Note that the filename is ignored for now, it always reads the first file in the root directory. The loading of o65 files is done in o65.c, and executing is done in exec.c This cleans up the main file signifigantly and leaves the project open to expansion.
76 lines
1.3 KiB
C
76 lines
1.3 KiB
C
#include <stdint.h>
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#include <conio.h>
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#include "sd_card.h"
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void sd_init() {
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uint32_t resp;
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sd_card_command(0, 0);
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sd_card_command(0x000001aa, 8);
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sd_card_resp(&resp);
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//cprintf("CMD8: %lx\n", resp);
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sd_card_command(0, 55);
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sd_card_command(0x40180000, 41);
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sd_card_resp(&resp);
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//cprintf("CMD41: %lx\n", resp);
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sd_card_command(0, 55);
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sd_card_command(0x40180000, 41);
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sd_card_resp(&resp);
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//cprintf("CMD41: %lx\n", resp);
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sd_card_command(0, 2);
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sd_card_resp(&resp);
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//cprintf("CMD2: %lx\n", resp);
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}
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uint16_t sd_get_rca() {
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uint32_t resp;
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sd_card_command(0, 3);
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resp = 0;
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sd_card_resp(&resp);
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//cprintf("CMD3: %lx\n", resp);
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return resp >> 16;
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}
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uint16_t sd_select_card(uint16_t rca) {
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uint32_t resp;
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sd_card_command((uint32_t)rca << 16, 7);
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sd_card_resp(&resp);
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return (uint16_t) resp;
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}
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uint16_t sd_get_status(uint16_t rca) {
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uint32_t resp;
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sd_card_command((uint32_t)rca << 16, 13);
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sd_card_resp(&resp);
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return (uint16_t) resp;
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}
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void sd_readblock(uint32_t addr, void* buf) {
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uint32_t resp;
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int i;
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sd_card_command(addr, 17);
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sd_card_resp(&resp);
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//cprintf("CMD17: %lx\n", resp);
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sd_card_wait_for_data();
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//cprintf("Read data: \n");
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for (i = 0; i < 512; i++){
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((uint8_t*)buf)[i] = sd_card_read_byte();
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}
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//cprintf("\n");
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}
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