Changeset 34c57e8 in avrstuff for EPRoxygen/at29c040.cpp

Timestamp:

Jul 7, 2012, 6:19:53 PM (12 years ago)

Author:

Adrien Destugues <pulkomandy@…>

Branches:

main

Children:

a6ae6ac

Parents:

d09030d

Message:

More work.

• Power on/off sequence OK
• Code to read chip ID written, but not working yet...

git-svn-id: ​svn://pulkomandy.tk/avrstuff@59 c6672c3c-f6b6-47f9-9001-1fd6b12fecbe

File:

• EPRoxygen/at29c040.cpp (modified) (1 diff)

EPRoxygen/at29c040.cpp

@@ -1 +1 @@
 #include "at29c040.h"
+
+#include <stdio.h>
+#include <unistd.h>
+
+
+AT29C040::AT29C040()
+        : Device()
+{
+}
+
+void AT29C040::power()
+{
+        Device::write(CTRL, 0b10011111 | CTRLmask);
+        Device::write(VOLT, 0b11001000 | VOLTmask);
+}
+
+void Device::shutdown()
+{
+        // All pins of the ROM are put either in high-Z, or 0V when it's not
+        // possible
+        Device::write(CTRL, 0x62);
+        Device::write(VOLT, 0x7F);
+        outb(port + 2, NONE);
+}
 
 void AT29C040::read(const char* filename)
 {
+        if (!checkId()) {
+                return;
+        }
 }
 
 void AT29C040::write(const char* filename)
 {
+        if (!checkId()) {
+                return;
+        }
 }
 
 void AT29C040::erase(void)
 {
+        if (!checkId()) {
+                return;
+        }
+
+        puts("Perfomring chip erase...");
 }
+
+bool AT29C040::checkId(void)
+{
+        // Chip enable
+        Device::write(CTRL, CTRLmask | CE);
+                // Address bits low, WE = 1, CE = 0, OE = 1
+                // TC and TD = 1
+        Device::write(VOLT, VOLTmask);
+                // D and A OE = 0
+                // VPP config ?
+                // TA, TB, TE, TF = ?
+
+        wr16(0x5555, 0xAA);
+        wr16(0x2AAA, 0x55);
+        wr16(0x5555, 0x90);
+
+        // clear DOE for reading
+        Device::write(VOLT, DOE | VOLTmask);
+        
+        usleep(10000);
+
+        // Read the result now
+        Device::write(ADR0, 0x00);
+        Device::write(ADR1, 0x00);
+        Device::write(CTRL, WE | CE | CTRLmask);
+        uint8_t manufacturer = Device::read();
+
+        getchar();
+
+        Device::write(CTRL, OE | WE | CE | CTRLmask);
+        Device::write(ADR0, 0x01);
+        Device::write(CTRL, WE | CE | CTRLmask);
+
+        uint8_t product = Device::read();
+
+        // re enable DOE, we are going to write again...
+        Device::write(CTRL, WE | OE | CE | CTRLmask);
+        Device::write(VOLT, VOLTmask);
+
+        wr16(0x5555, 0xAA);
+        wr16(0x2AAA, 0x55);
+        wr16(0x5555, 0xF0);
+        usleep(10000);
+
+        // Chip disable - we're done !
+        Device::write(CTRL, 0xFF | CTRLmask);
+        
+        bool ok = (manufacturer == 0x1F && product == 0xA4);
+
+        if (!ok)
+        {
+                fprintf(stderr, "Chip ID %X:%X does not match expected %X:%X\n",
+                        manufacturer, product, 0x1F, 0xA4);
+        } else {
+                fprintf(stderr, "AT29C040 detected successfully!\n");
+        }
+
+        return ok;
+}