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