74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
#include <stdlib.h>
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#include <stdint.h>
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#include "crc.h"
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#include "uart.h"
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#include "config.h"
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#include "sram.h"
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extern FILE uart_stdout;
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uint16_t crc_xmodem_update(uint16_t crc, uint8_t data)
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{
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int i;
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crc = crc ^ ((uint16_t) data << 8);
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for (i = 0; i < 8; i++) {
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if (crc & 0x8000)
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crc = (crc << 1) ^ 0x1021;
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else
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crc <<= 1;
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}
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return crc;
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}
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uint16_t do_crc(uint8_t * data, uint16_t size)
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{
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uint16_t crc = 0;
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uint16_t i;
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for (i = 0; i < size; i++) {
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crc = crc_xmodem_update(crc, data[i]);
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}
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return crc;
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}
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uint16_t do_crc_update(uint16_t crc, uint8_t * data, uint16_t size)
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{
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uint16_t i;
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for (i = 0; i < size; i++)
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crc = crc_xmodem_update(crc, data[i]);
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return crc;
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}
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void crc_check_memory(uint32_t top_addr,uint8_t *buffer)
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{
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uint16_t crc = 0;
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uint32_t addr;
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uint8_t req_bank = 0;
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for (addr = 0x000000; addr < top_addr; addr += TRANSFER_BUFFER_SIZE) {
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sram_read_buffer(addr, buffer, TRANSFER_BUFFER_SIZE);
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crc = do_crc_update(crc, buffer, TRANSFER_BUFFER_SIZE);
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if (addr && addr % 32768 == 0) {
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printf("crc_check_memory: req_bank: 0x%02x Addr: 0x%08lx CRC: 0x%04x\n",
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req_bank, addr, crc);
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req_bank++;
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crc = 0;
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}
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}
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}
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uint16_t crc_check_memory_range(uint32_t start_addr, uint32_t size,uint8_t *buffer)
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{
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uint16_t crc = 0;
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uint32_t addr;
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uint8_t req_bank = 0;
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for (addr = start_addr; addr < start_addr + size; addr += TRANSFER_BUFFER_SIZE) {
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sram_read_buffer(addr, buffer, TRANSFER_BUFFER_SIZE);
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crc = do_crc_update(crc, buffer, TRANSFER_BUFFER_SIZE);
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}
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#if DEBUG_USB
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printf("crc_check_memory_range: Addr: 0x%08lx CRC: 0x%04x\n", addr, crc);
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#endif
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return crc;
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} |