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- #include "catch.hpp"
- #include "EmuTime.hh"
- #include "EEPROM_93C46.hh"
- #include "XMLElement.hh"
- #include "xrange.hh"
- using namespace openmsx;
- constexpr auto step = EmuDuration::usec(10);
- static void input_pattern(EEPROM_93C46& eeprom, EmuTime& time, uint32_t pattern, unsigned len)
- {
- assert(len <= 32);
- for (auto i : xrange(len)) {
- eeprom.write_DI(pattern & (1 << (len - 1 - i)), time);
- time += step;
- eeprom.write_CLK(true, time);
- time += step;
- eeprom.write_CLK(false, time);
- time += step;
- }
- }
- static void write(EEPROM_93C46& eeprom, EmuTime& time, unsigned addr, uint8_t value)
- {
- assert(addr < EEPROM_93C46::NUM_ADDRESSES);
- eeprom.write_CS(true, time);
- time += step;
- uint32_t pattern = 0b101; // start-bit + write-opcode
- pattern <<= EEPROM_93C46::ADDRESS_BITS;
- pattern |= addr;
- pattern <<= EEPROM_93C46::DATA_BITS;
- pattern |= value;
- unsigned len = 3 + EEPROM_93C46::ADDRESS_BITS + EEPROM_93C46::DATA_BITS;
- input_pattern(eeprom, time, pattern, len);
- eeprom.write_CS(false, time);
- time += step;
- }
- static void write_all(EEPROM_93C46& eeprom, EmuTime& time, uint8_t value)
- {
- eeprom.write_CS(true, time);
- time += step;
- uint32_t pattern = 0b100; // start-bit + write-opcode
- pattern <<= EEPROM_93C46::ADDRESS_BITS;
- pattern |= 0b0100000; // 0b01xxxxx
- pattern <<= EEPROM_93C46::DATA_BITS;
- pattern |= value;
- unsigned len = 3 + EEPROM_93C46::ADDRESS_BITS + EEPROM_93C46::DATA_BITS;
- input_pattern(eeprom, time, pattern, len);
- eeprom.write_CS(false, time);
- time += step;
- }
- static void write_enable(EEPROM_93C46& eeprom, EmuTime& time)
- {
- eeprom.write_CS(true, time);
- time += step;
- uint32_t pattern = 0b100; // start-bit + '00'-opcode
- pattern <<= EEPROM_93C46::ADDRESS_BITS;
- pattern |= 0b1100000; // 0b11xxxxx
- unsigned len = 3 + EEPROM_93C46::ADDRESS_BITS;
- input_pattern(eeprom, time, pattern, len);
- eeprom.write_CS(false, time);
- time += step;
- }
- static void write_disable(EEPROM_93C46& eeprom, EmuTime& time)
- {
- eeprom.write_CS(true, time);
- time += step;
- uint32_t pattern = 0b100; // start-bit + '00'-opcode
- pattern <<= EEPROM_93C46::ADDRESS_BITS;
- pattern |= 0b0000000; // 0b00xxxxx
- unsigned len = 3 + EEPROM_93C46::ADDRESS_BITS;
- input_pattern(eeprom, time, pattern, len);
- eeprom.write_CS(false, time);
- time += step;
- }
- static bool waitIdle(EEPROM_93C46& eeprom, EmuTime& time)
- {
- eeprom.write_CS(true, time);
- time += step;
- bool wasBusy = false;
- int i = 0;
- while (i < 10'000) {
- bool ready = eeprom.read_DO(time);
- time += step;
- if (ready) break;
- wasBusy = true;
- }
- CHECK(i < 10'000); // we must not wait indefinitely
- eeprom.write_CS(false, time);
- time += step;
- return wasBusy;
- }
- static uint8_t read(EEPROM_93C46& eeprom, EmuTime& time, unsigned addr)
- {
- assert(addr < EEPROM_93C46::NUM_ADDRESSES);
- eeprom.write_CS(true, time);
- time += step;
- uint32_t pattern = 0b110; // start-bit + write-opcode
- pattern <<= EEPROM_93C46::ADDRESS_BITS;
- pattern |= addr;
- unsigned len = 3 + EEPROM_93C46::ADDRESS_BITS;
- input_pattern(eeprom, time, pattern, len);
- CHECK(eeprom.read_DO(time) == false); // initial 0-bit
- uint8_t result = 0;
- for (auto i : xrange(EEPROM_93C46::DATA_BITS)) {
- (void)i;
- eeprom.write_CLK(true, time);
- time += step;
- result <<= 1;
- result |= eeprom.read_DO(time);
- time += step;
- eeprom.write_CLK(false, time);
- time += step;
- }
- eeprom.write_CS(false, time);
- time += step;
- return result;
- }
- static void read_block(EEPROM_93C46& eeprom, EmuTime& time, unsigned addr,
- unsigned num, uint8_t* output)
- {
- assert(addr < EEPROM_93C46::NUM_ADDRESSES);
- eeprom.write_CS(true, time);
- time += step;
- uint32_t pattern = 0b110; // start-bit + write-opcode
- pattern <<= EEPROM_93C46::ADDRESS_BITS;
- pattern |= addr;
- unsigned len = 3 + EEPROM_93C46::ADDRESS_BITS;
- input_pattern(eeprom, time, pattern, len);
- CHECK(eeprom.read_DO(time) == false); // initial 0-bit
- for (auto j : xrange(num)) {
- (void)j;
- *output = 0;
- for (auto i : xrange(EEPROM_93C46::DATA_BITS)) {
- (void)i;
- eeprom.write_CLK(true, time);
- time += step;
- *output <<= 1;
- *output |= eeprom.read_DO(time);
- time += step;
- eeprom.write_CLK(false, time);
- time += step;
- }
- ++output;
- }
- eeprom.write_CS(false, time);
- time += step;
- }
- static void erase(EEPROM_93C46& eeprom, EmuTime& time, unsigned addr)
- {
- assert(addr < EEPROM_93C46::NUM_ADDRESSES);
- eeprom.write_CS(true, time);
- time += step;
- uint32_t pattern = 0b111; // start-bit + '00'-opcode
- pattern <<= EEPROM_93C46::ADDRESS_BITS;
- pattern |= addr;
- unsigned len = 3 + EEPROM_93C46::ADDRESS_BITS;
- input_pattern(eeprom, time, pattern, len);
- eeprom.write_CS(false, time);
- time += step;
- }
- static void erase_all(EEPROM_93C46& eeprom, EmuTime& time)
- {
- eeprom.write_CS(true, time);
- time += step;
- uint32_t pattern = 0b100; // start-bit + '00'-opcode
- pattern <<= EEPROM_93C46::ADDRESS_BITS;
- pattern |= 0b1000000; // 0b10xxxxx
- unsigned len = 3 + EEPROM_93C46::ADDRESS_BITS;
- input_pattern(eeprom, time, pattern, len);
- eeprom.write_CS(false, time);
- time += step;
- }
- TEST_CASE("EEPROM_93C46")
- {
- XMLElement xml;
- EEPROM_93C46 eeprom(xml);
- const uint8_t* data = eeprom.backdoor();
- EmuTime time = EmuTime::zero();
- // initially filled with 255
- for (auto addr : xrange(EEPROM_93C46::NUM_ADDRESSES)) {
- CHECK(data[addr] == 255);
- }
- // write 123 to address 45 .. but eeprom is still write-protected
- write(eeprom, time, 45, 123);
- CHECK(!waitIdle(eeprom, time));
- for (auto addr : xrange(EEPROM_93C46::NUM_ADDRESSES)) {
- CHECK(data[addr] == 255);
- }
- // again, but first write-enable
- write_enable(eeprom, time);
- CHECK(!waitIdle(eeprom, time));
- write(eeprom, time, 45, 123);
- CHECK(waitIdle(eeprom, time));
- for (auto addr : xrange(EEPROM_93C46::NUM_ADDRESSES)) {
- uint8_t expected = (addr == 45) ? 123 : 255;
- CHECK(data[addr] == expected);
- }
- // read address 45
- CHECK(int(read(eeprom, time, 45)) == 123); // contains 123
- CHECK(!waitIdle(eeprom, time)); // not busy after read
- CHECK(int(read(eeprom, time, 46)) == 255); // other addr still contains 255
- CHECK(!waitIdle(eeprom, time)); // not busy after read
- // write to address 45 without first erasing it
- // You might expect to read the value 123 & 20 == 16, but the M93C46
- // datasheet documents that the write command does an auto-erase.
- write(eeprom, time, 45, 20);
- CHECK(waitIdle(eeprom, time));
- for (auto addr : xrange(EEPROM_93C46::NUM_ADDRESSES)) {
- uint8_t expected = (addr == 45) ? 20 : 255;
- CHECK(data[addr] == expected);
- }
- // erase addr 99 -> doesn't influence addr 45
- erase(eeprom, time, 99);
- CHECK(waitIdle(eeprom, time));
- for (auto addr : xrange(EEPROM_93C46::NUM_ADDRESSES)) {
- uint8_t expected = (addr == 45) ? 20 : 255;
- CHECK(data[addr] == expected);
- }
- // erase addr 45 -> all 255 again
- erase(eeprom, time, 45);
- CHECK(waitIdle(eeprom, time));
- for (auto addr : xrange(EEPROM_93C46::NUM_ADDRESSES)) {
- CHECK(data[addr] == 255);
- }
- // write all
- write_all(eeprom, time, 77);
- CHECK(waitIdle(eeprom, time));
- for (auto addr : xrange(EEPROM_93C46::NUM_ADDRESSES)) {
- CHECK(data[addr] == 77);
- }
- // write to the end and the start of the address space
- write(eeprom, time, EEPROM_93C46::NUM_ADDRESSES - 2, 5);
- CHECK(waitIdle(eeprom, time));
- write(eeprom, time, EEPROM_93C46::NUM_ADDRESSES - 1, 11);
- CHECK(waitIdle(eeprom, time));
- write(eeprom, time, 0, 22);
- CHECK(waitIdle(eeprom, time));
- // write-disable and one more write
- write_disable(eeprom, time);
- CHECK(!waitIdle(eeprom, time));
- write(eeprom, time, 1, 33); // not executed
- CHECK(!waitIdle(eeprom, time));
- for (auto addr : xrange(EEPROM_93C46::NUM_ADDRESSES)) {
- uint8_t expected = (addr == 126) ? 5
- : (addr == 127) ? 11
- : (addr == 0) ? 22
- : 77;
- CHECK(data[addr] == expected);
- }
- // read-block, with wrap-around
- uint8_t buf[6];
- read_block(eeprom, time, EEPROM_93C46::NUM_ADDRESSES - 3, 6, buf);
- CHECK(!waitIdle(eeprom, time));
- CHECK(buf[0] == 77);
- CHECK(buf[1] == 5);
- CHECK(buf[2] == 11);
- CHECK(buf[3] == 22); // wrapped to address 0
- CHECK(buf[4] == 77); // was write protected
- CHECK(buf[5] == 77);
- // erase-all, but write-protected
- erase_all(eeprom, time);
- CHECK(!waitIdle(eeprom, time));
- CHECK(data[0] == 22); // not changed
- // erase-all, write-enabled
- write_enable(eeprom, time);
- CHECK(!waitIdle(eeprom, time));
- erase_all(eeprom, time);
- CHECK(waitIdle(eeprom, time));
- for (auto addr : xrange(EEPROM_93C46::NUM_ADDRESSES)) {
- CHECK(data[addr] == 255);
- }
- }
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