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CPLD: Method to calculate bitstream CRC32.

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This commit is contained in:
Jared Boone 2016-07-05 12:06:51 -07:00
parent df825807d6
commit 3ed1d9e24a
2 changed files with 24 additions and 0 deletions
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18
firmware/common/cpld_max5.cpp
View File

@ -114,6 +114,13 @@ bool CPLD::verify(
return block_0_success && block_1_success; return block_0_success && block_1_success;
} }
uint32_t CPLD::crc() {
crc_t crc { 0x04c11db7, 0xffffffff, 0xffffffff };
block_crc(0, 3328, crc);
block_crc(1, 512, crc);
return crc.checksum();
}
void CPLD::sector_select(const uint16_t id) { void CPLD::sector_select(const uint16_t id) {
shift_ir(0x203); // Sector select shift_ir(0x203); // Sector select
jtag.runtest_tck(93); // 5us jtag.runtest_tck(93); // 5us
@ -219,6 +226,17 @@ bool CPLD::is_blank_block(const uint16_t id, const size_t count) {
return success; return success;
} }
void CPLD::block_crc(const uint16_t id, const size_t count, crc_t& crc) {
sector_select(id);
shift_ir(0x205); // Read
jtag.runtest_tck(93); // 5us
for(size_t i=0; i<count; i++) {
const uint16_t from_device = jtag.shift_dr(16, 0xffff);
crc.process_bytes(&from_device, sizeof(from_device));
}
}
bool CPLD::is_blank() { bool CPLD::is_blank() {
const auto block_0_blank = is_blank_block(0x0000, 3328); const auto block_0_blank = is_blank_block(0x0000, 3328);
const auto block_1_blank = is_blank_block(0x0001, 512); const auto block_1_blank = is_blank_block(0x0001, 512);

6
firmware/common/cpld_max5.hpp
View File

@ -23,6 +23,7 @@
#define __CPLD_MAX5_H__ #define __CPLD_MAX5_H__
#include "jtag.hpp" #include "jtag.hpp"
#include "crc.hpp"
#include <cstdint> #include <cstdint>
#include <cstddef> #include <cstddef>
@ -75,6 +76,8 @@ public:
bool is_blank(); bool is_blank();
uint32_t crc();
std::pair<bool, uint8_t> boundary_scan(); std::pair<bool, uint8_t> boundary_scan();
enum class Instruction { enum class Instruction {
@ -135,6 +138,9 @@ private:
bool is_blank_block(const uint16_t id, const size_t count); bool is_blank_block(const uint16_t id, const size_t count);
using crc_t = CRC<32, true, true>;
void block_crc(const uint16_t id, const size_t count, crc_t& crc);
const uint32_t IDCODE = 0b00000010000010100101000011011101; const uint32_t IDCODE = 0b00000010000010100101000011011101;
const size_t IR_LENGTH = 10; const size_t IR_LENGTH = 10;