Revision 0:52ce2a69824f, committed 2010-06-21

Comitter:

Chamilton09

Date:

Mon Jun 21 14:43:29 2010 +0000

Commit message:

Changed in this revision

diff -r 000000000000 -r 52ce2a69824f main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Jun 21 14:43:29 2010 +0000
@@ -0,0 +1,261 @@
+// Code to implement ICSP of an AVR using the ISP on the mBed pins 5,6,7 
+// and 8 as RESET
+
+//NOTES:    -load hex file onto the mBed as a file named "avr"
+//          -Change TARGET_CLK to a suiteable value for your particular avr (it gets divided by 2 for ATMega88)
+//          -Change the max page size to suite the microcontroller (change the 64 only)
+
+#include "mbed.h"
+#define LSB(I) ((I) & 0xFF)
+#define MSB(I) (((I) & 0xF00) >> 8)
+
+#define TARGET_CLK 1000000L
+#define MAX_PAGE_SIZE (64 >> 1) //divide max page size by 2 to get number of words per page                                    
+                                                   
+SPI spi(p5, p6, p7); // mosi, miso, sclk/
+DigitalOut reset(p8);   //RESET
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+LocalFileSystem local("local");
+
+
+int enable_prog_mode() //function to enable prog mode
+{
+    int failed = 0;
+    
+    while(failed < 5) //loop to try to enable programming mode 5 times
+    {
+        spi.write(0xAC);
+        spi.write(0x53);
+        int prog_en_check = spi.write(0x00);
+        if(prog_en_check == 0x53) { //if data read on 3rd byte load is 0x53
+            spi.write(0x00);        //programming mode was enabled...good job!
+            pc.printf("\nProgramming mode enabled...\n");
+            return 0;
+        }      
+        else{
+            pc.printf("Programming mode failed!\n");
+            pc.printf("%d\n",prog_en_check); 
+            failed++;
+            reset = 1; //pulse reset and try again
+            reset = 0;
+            pc.printf("Trying again...\n");
+            wait(0.5);
+        }
+     }
+    return -1; //Bummer...
+}
+
+//A function to poll BSY to prevent loading a new instruction prematurely
+void still_programming() 
+{
+    int check = 1;
+    while(check == 1)
+    {
+        spi.write(0xF0);
+        spi.write(0x00);
+        spi.write(0x00);
+        check = spi.write(0x00); //read data byte out
+    }
+}
+
+//A function to send the chip erase command
+void chip_erase() 
+{
+        pc.printf("Chip erase initiated...\n");
+        spi.write(0xAC);
+        spi.write(0x80);
+        spi.write(0x00);
+        spi.write(0x00);
+        still_programming();
+        pc.printf("Chip erase completed!\n");
+        reset = 1;
+        wait(0.020);
+        reset = 0;
+        wait(0.020);
+        enable_prog_mode();
+}
+
+
+void write_prog_page(uint16_t addr)
+{
+    //write program memory page
+    spi.write(0x4C);
+    spi.write(MSB(addr));
+    spi.write(LSB(addr));
+    spi.write(0x00);
+    still_programming(); //make sure the operation worked
+   // pc.printf("Wrote a flash page.\n"); 
+}
+
+
+//function to load and write program memory
+//args: addr is the 12 bit address of the memory location
+//      low_data and high_data are the values to write to that location
+void load_prog_page(uint16_t addr, uint8_t low_data, uint8_t high_data)//int addr_MSB, 
+{
+    //load program memory low byte (little endian)
+    spi.write(0x40);
+    spi.write(0x00);
+    spi.write(LSB(addr));
+    spi.write(low_data);
+    
+    //load program memory high byte
+    spi.write(0x48);
+    spi.write(0x00);
+    spi.write(LSB(addr));
+    spi.write(high_data);
+    //pc.printf(" Wrote: %x %x to LSB address: %x\n", high_data, low_data, LSB(addr));
+   
+    // write page if 32 words have now been written
+    if(addr % MAX_PAGE_SIZE == (MAX_PAGE_SIZE-1))
+        write_prog_page(addr);
+}
+
+void write_lock_bits(uint8_t bits)
+{
+    bits = bits & 0xFF;
+    spi.write(0xAC);
+    spi.write(0xE0);
+    spi.write(0x00);
+    spi.write(bits);
+    still_programming();
+    pc.printf("Wrote lock bits...\n");
+}
+
+void write_fuse_bits(uint8_t bits)
+{
+    bits = bits & 0xFF;
+    spi.write(0xAC);
+    spi.write(0xA0);
+    spi.write(0x00);
+    spi.write(bits);
+    still_programming();
+    pc.printf("Wrote fuse bits...\n");
+}
+
+void write_fuse_bits_high(uint8_t bits)
+{
+    bits = bits & 0xFF;
+    spi.write(0xAC);
+    spi.write(0xA8);
+    spi.write(0x00);
+    spi.write(bits);
+    still_programming();
+    pc.printf("Wrote fuse bits high...\n");
+}
+
+void write_extended_fuse_bits(uint8_t bits)
+{
+    bits = bits & 0xFF;
+    spi.write(0xAC);
+    spi.write(0xA4);
+    spi.write(0x00);
+    spi.write(bits);
+    still_programming();
+    pc.printf("Wrote extended fuse bits...\n");
+}
+
+uint8_t read_byte(FILE *file)
+{
+    char ascii_char[2];
+    fread(&ascii_char, 1, 2, file);
+    return   (((ascii_char[0] < 65) ? (ascii_char[0]-48) : (ascii_char[0]-55)) << 4)
+            | ((ascii_char[1] < 65) ? (ascii_char[1]-48) : (ascii_char[1]-55));
+}
+
+void read_prog_flash(uint8_t addr_MSB, uint8_t addr_LSB)
+{
+    spi.write(0x28);
+    spi.write(addr_MSB);
+    spi.write(addr_LSB);
+    pc.printf("At address LSB %x: MSB: %x - %x ",addr_LSB,addr_MSB,spi.write(0x00));
+    spi.write(0x20);
+    spi.write(addr_MSB);
+    spi.write(addr_LSB);
+    pc.printf("%x\n",spi.write(0x00));      
+}
+
+int main() {
+    reset = 1;
+    // Setup the spi for 8 bit data,writing data on the rising SCK edge,
+    // and reading data on the falling SCK edge as according to AVR specs
+    // with a 1MHz clock rate
+    pc.printf("\nPress any button to program the AVR.\n");
+    char c = pc.getc();
+    
+    spi.format(8,1);        //SPI format: write data on rising edge, read on falling
+                            //w/ a base clock value of zero
+    spi.frequency(TARGET_CLK >> 2);
+    //wait(0.5);
+    pc.printf("SPI interface started...\n");
+    
+    // Select the device by seting chip select low
+    reset = 0;
+    wait(0.02); 
+
+    if(enable_prog_mode() != 0)  //Enable programming mode and check for errors
+        return -1;
+    spi.write(0x30);
+    spi.write(0x00);
+    spi.write(0x00);
+    pc.printf("SIGNATURE BYTE: %x\n",spi.write(0x00));
+    chip_erase();
+    
+    write_lock_bits(0xFF);                  //1111 1111
+    write_fuse_bits(0x62);                  //1110 0010
+    write_fuse_bits_high(0xDF);             //1101 1111
+    write_extended_fuse_bits(0xF9);         //1111 1001
+    
+    //Opening a file on local FS as in example code
+    pc.printf("Opening File...\n"); 
+    int flag = 0;
+    FILE *hex_file;
+    hex_file = fopen("/local/avr","r");
+    if(hex_file !=NULL)
+    {    
+        uint16_t address = 0;
+        char temp;
+        temp = fgetc(hex_file);
+        while(flag == 0)
+        {
+            if(temp == ':')
+            {
+                uint8_t length = read_byte(hex_file);
+                if(length == 0){
+                    flag = 1;
+                    printf("EOF line reached.\n");
+                }
+                else{
+                    fseek(hex_file, 6, SEEK_CUR); //2 if reading address
+                    
+                    for(uint8_t i=0;i<length;i+=2){
+                        uint8_t low_data = read_byte(hex_file);
+                        uint8_t high_data = read_byte(hex_file);
+                       
+                        //load data bytes here
+                        load_prog_page(address, low_data, high_data);
+                        
+                        address++;
+                    }
+                    while((temp = fgetc(hex_file)) != ':');
+                    //pc.printf("\n");             
+                }
+            }
+            else flag =1;
+        }
+        pc.printf("WRITE THE PAGE!\n");//write page here
+        write_prog_page(address);
+        fclose(hex_file);
+    }
+    else {
+        pc.printf("Failed to open the file...check the name.\n");          
+    }
+    pc.printf("Successfully programmed!(hopefully...)\n");    
+    
+    // Deselect the device
+    reset = 1;
+    wait(0.02);
+    return 0;    
+}
\ No newline at end of file

diff -r 000000000000 -r 52ce2a69824f mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon Jun 21 14:43:29 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/029aa53d7323