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https://github.com/TomNisbet/TommyPROM.git
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Add support for SST27C0x0 flash chips
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035b3412af
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@ -22,12 +22,13 @@ static void disableWrite() { digitalWrite(WE, HIGH);}
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PromDevice27::PromDevice27(uint32_t size, E27C_PGM pgmType, unsigned long pulseWidthUsec,
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unsigned writeAttempts, unsigned overwriteMultiplier)
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unsigned writeAttempts, unsigned overwriteMultiplier, bool verify)
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: PromDevice(size, 0, 0, false),
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mPgmType(pgmType),
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mPulseWidthUsec(pulseWidthUsec),
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mWriteAttempts(writeAttempts),
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mOverwriteMultiplier(overwriteMultiplier)
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mOverwriteMultiplier(overwriteMultiplier),
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mVerifyByte(verify)
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{
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}
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@ -99,14 +100,12 @@ bool PromDevice27::burnByteWE(byte value, uint32_t address)
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bool status = false;
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unsigned writeCount = 0;
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byte data = 0;
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disableOutput();
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disableWrite();
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enableChip();
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setAddress(address);
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while (!status && (writeCount < mWriteAttempts))
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{
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while (!status && (writeCount < mWriteAttempts)) {
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setDataBusMode(OUTPUT);
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writeDataBus(value);
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delayMicroseconds(1);
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@ -115,15 +114,17 @@ bool PromDevice27::burnByteWE(byte value, uint32_t address)
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disableWrite();
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++writeCount;
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setDataBusMode(INPUT);
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enableOutput();
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data = readDataBus();
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disableOutput();
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status = (readDataBus() == value);
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if (mVerifyByte) {
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setDataBusMode(INPUT);
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enableOutput();
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status = readDataBus() == value;
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disableOutput();
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} else {
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status = true;
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}
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}
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if (status && (mOverwriteMultiplier > 0))
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{
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if (status && (mOverwriteMultiplier > 0)) {
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setDataBusMode(OUTPUT);
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writeDataBus(value);
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delayMicroseconds(1);
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@ -132,8 +133,8 @@ bool PromDevice27::burnByteWE(byte value, uint32_t address)
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disableWrite();
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}
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setDataBusMode(INPUT);
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disableChip();
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return status;
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}
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@ -151,14 +152,12 @@ bool PromDevice27::burnByteCE(byte value, uint32_t address)
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bool status = false;
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unsigned writeCount = 0;
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byte data = 0;
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disableOutput();
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disableWrite();
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disableChip();
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setAddress(address);
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while (!status && (writeCount < mWriteAttempts))
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{
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while (!status && (writeCount < mWriteAttempts)) {
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setDataBusMode(OUTPUT);
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writeDataBus(value);
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delayMicroseconds(2);
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@ -168,24 +167,24 @@ bool PromDevice27::burnByteCE(byte value, uint32_t address)
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delayMicroseconds(2);
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++writeCount;
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setDataBusMode(INPUT);
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enableOutput();
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data = readDataBus();
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disableOutput();
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status = (readDataBus() == value);
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if (mVerifyByte) {
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setDataBusMode(INPUT);
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enableOutput();
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status = readDataBus() == value;
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disableOutput();
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}
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}
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setDataBusMode(INPUT);
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disableChip();
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return status;
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}
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ERET PromDevice27::erase(uint32_t start, uint32_t end)
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{
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if (mPgmType != E27C_PGM_CE) return RET_NOT_SUPPORT;
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ERET status = RET_FAIL;
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// Erase code for the 27E257 and 27C257. The Vpp and A9 pins are held at 14V for the
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// erase and verify cycle. This erases the entire chip, so the start and end address
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// parameters are ignored.
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disableChip();
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disableOutput();
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setAddress(0);
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@ -193,30 +192,46 @@ ERET PromDevice27::erase(uint32_t start, uint32_t end)
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writeDataBus(0xff);
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delayMicroseconds(2);
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unsigned writeCount = 0;
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ERET status = RET_FAIL;
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while ((status == RET_FAIL) && (writeCount < mWriteAttempts)) {
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setAddress(0);
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setDataBusMode(OUTPUT);
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writeDataBus(0xff);
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delayMicroseconds(2);
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enableChip();
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delay(100);
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disableChip();
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delayMicroseconds(2);
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if (mPgmType == E27C_PGM_WE) {
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// Erase code for the SST27C0x0. The Vpp and A9 pins are held at 12V for the
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// erase cycle. This erases the entire chip, so the start and end address
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// parameters are ignored. There is no erase verification for this chip.
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enableChip();
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delayMicroseconds(1);
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enableWrite();
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delayMicroseconds(100); // Hard coded for SST27F020
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disableWrite();
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disableChip();
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setDataBusMode(INPUT);
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status = RET_OK;
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} else {
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// Erase code for the 27E257 and 27C257. The Vpp and A9 pins are held at 14V for
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// the erase and verify cycle. This erases the entire chip, so the start and end
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// address parameters are ignored.
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unsigned writeCount = 0;
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while ((status == RET_FAIL) && (writeCount < mWriteAttempts)) {
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setAddress(0);
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setDataBusMode(OUTPUT);
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writeDataBus(0xff);
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delayMicroseconds(2);
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enableChip();
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delay(100);
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disableChip();
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delayMicroseconds(2);
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// Read back the data to verify all cells are erased. Note That this is done
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// while CE is HIGH. This is the erase verify mode.
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setDataBusMode(INPUT);
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for (uint32_t address = 0; (address < mSize); address++) {
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setAddress(address);
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enableOutput();
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uint8_t b = readDataBus();
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disableOutput();
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if (b != 0xff) break;
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}
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status = RET_OK;
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}
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// Read back the data to verify all cells are erased. Note That this is done
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// while CE is HIGH. This is the erase verify mode.
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setDataBusMode(INPUT);
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for (uint32_t address = 0; (address < mSize); address++) {
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setAddress(address);
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enableOutput();
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uint8_t b = readDataBus();
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disableOutput();
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if (b != 0xff) break;
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}
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status = RET_OK;
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}
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}
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return status;
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}
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@ -224,15 +239,12 @@ ERET PromDevice27::erase(uint32_t start, uint32_t end)
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void PromDevice27::myDelay(unsigned int us)
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{
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if (us > 16000)
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{
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if (us > 16000) {
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// The delayMicroseconds code can't do delays longer than 16ms, so use the
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// ms delay code for larger values. This rounds down to the nearest ms, so
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// it is not possible to delay for 40.5 ms, for example.
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delay(us / 1000);
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}
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else
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{
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} else {
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delayMicroseconds((unsigned int) us);
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}
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}
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@ -36,7 +36,7 @@ class PromDevice27 : public PromDevice
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{
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public:
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PromDevice27(uint32_t size, E27C_PGM pgmType, unsigned long pulseWidthUsec,
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unsigned writeAttempts, unsigned overwriteMultiplier);
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unsigned writeAttempts, unsigned overwriteMultiplier, bool verify=true);
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void begin();
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const char * getName() { return "27 series EPROM"; }
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ERET erase(uint32_t start, uint32_t end);
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@ -54,6 +54,7 @@ class PromDevice27 : public PromDevice
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unsigned long mPulseWidthUsec;
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unsigned mWriteAttempts;
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unsigned mOverwriteMultiplier;
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bool mVerifyByte;
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};
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#endif // #define INCLUDE_PROM_DEVICE_27_H
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@ -189,7 +189,7 @@ bool PromDevice28C::waitForWriteCycleEnd(byte lastValue)
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byte b1=0, b2=0;
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setDataBusMode(INPUT);
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delayMicroseconds(1);
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for (int readCount = 1; (readCount < (mMaxWriteTime * 100)); readCount++)
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for (unsigned readCount = 1; (readCount < (mMaxWriteTime * 100)); readCount++)
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{
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enableChip();
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enableOutput();
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@ -19,7 +19,7 @@
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#include "XModem.h"
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static const char * MY_VERSION = "3.2";
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static const char * MY_VERSION = "3.3";
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// Global status
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@ -44,11 +44,13 @@ PromDevice28C prom(32 * 1024L, 64, 10, true);
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// 1000us (1ms) write pulse
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// 15 write attempts
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// 4x overwrite pulse
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// (true) verify data byte after writing
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//PromDevice27 prom(8 * 1024L, E27C_PGM_WE, 1000L, 15, 4); // 2764 with SEEQ intelligent programming
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//PromDevice27 prom(32 * 1024L, E27C_PGM_WE, 1000L, 25, 3); // 27C256 with SEEQ intelligent programming
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//PromDevice27 prom(2 * 1024L, E27C_PGM_WE, 50000L, 1, 0); // 2716 with single 50ms write
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//PromDevice27 prom(64 * 1024L, E27C_PGM_WE, 100L, 11, 0); // 27C040 with Atmel rapid programming
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PromDevice27 prom(32 * 1024L, E27C_PGM_CE, 100L, 25, 0); // 27C257/27E257 with 100uS program pulse on CE
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//PromDevice27 prom(512 * 1024L, E27C_PGM_WE, 100L, 11, 0); // 27C040 with Atmel rapid programming
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//PromDevice27 prom(32 * 1024L, E27C_PGM_CE, 100L, 25, 0); // 27C257/27E257 with 100uS program pulse on CE
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PromDevice27 prom(256 * 1024L, E27C_PGM_WE, 20L, 1, 0, false); // SST27SF020 with single 20us write, no verify
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#elif defined(PROM_IS_SST39SF)
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// Define a device for anSST39SF Flash with the following parameters:
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@ -161,7 +161,8 @@ The 8755 build of TommyPROM also has a circuit to control the 25V programming pu
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|:--- |:--- |:--- |:--- |:--- |
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|AT28C256 |Atmel, others|EEPROM |28C |Fully supported|
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|SST39SF040|Microchip |Flash |SST39SF|All SST39SF0x0 supported|
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|SST28SF040|SST |Flash | |All SST28SF0x0 supported|
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|SST28SF040|SST |Flash |SST39SF|All SST28SF0x0 supported|
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|SST27SF020|SST |Flash |27 |12V continuous for pgm/erase|
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|WE27C257 |Winbond |EEPROM |27 |Continual 12V or 14V for program/erase|
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|AT29C010 |Atmel |Flash |28C |Only with 128 byte or less sector size|
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|8755A |Intel |EPROM |8755A |Requires 25V pulses to program|
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@ -195,6 +196,18 @@ This is an earlier version of the SST39SF series chips. They are pin compatible
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flash chips support software data protection. The _Lock_ and _Unlock_ commands can be
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used to enable and disable SDP from the command line.
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#### SST27SF020
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The Silicon Storage SST27SF0x0 are programmed similarly to the 27C257 in that a constant
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voltage is applied for program and erase operations. Unlike the 27C257, these have a
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dedicated WE pin that controls programming and erasing. Another difference is that they
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do not have a verify operation to read back the programmed data.
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These Flash chips have a _VPP_ pin that needs a constant 12V during programming. Unlike
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the newer 28C EEPROMs, these chips do not automatically erase before writing to a
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location. Instead, the entire chip is erased by applying 12V to _VPP_ and _A9_ and then
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pulsing _WE_.
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#### 27C257
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The Winbond WE27C257 and WE27E257 appear to be identical 32Kx8 EEPROMs. The 27C version
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@ -228,4 +241,3 @@ for chips with the 256 byte buffer.
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|Model |Manufacturer |Type |Module |Notes|
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|:--- |:--- |:--- |:--- |:--- |
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|M27C4001 |ST Micro |EEPROM | |VCC=6.5V, VPP=12.75V to pgm|
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|SST27SF020|SST |Flash | |12V continuous for pgm/erase|
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