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PsiSwarm/eprom.cpp@2:a6214fd156ff, 2015-10-05 (annotated)

Committer:
jah128
Date:
Mon Oct 05 14:42:16 2015 +0000
Revision:
2:a6214fd156ff
Parent:
1:f6356cf1cefc
Child:
6:ff3c66f7372b
Changed nothing

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jah128 0:8a5497a2e366 1 /** University of York Robotics Laboratory PsiSwarm Library: Eprom Functions Source File
jah128 1:f6356cf1cefc 2 *
jah128 0:8a5497a2e366 3 * File: eprom.cpp
jah128 0:8a5497a2e366 4 *
jah128 0:8a5497a2e366 5 * (C) Dr James Hilder, Dept. Electronics & Computer Science, University of York
jah128 1:f6356cf1cefc 6 *
jah128 0:8a5497a2e366 7 * PsiSwarm Library Version: 0.2, October 2015
jah128 0:8a5497a2e366 8 *
jah128 0:8a5497a2e366 9 * Functions for accessing the 64Kb EPROM chip and reading the reserved firmware block
jah128 0:8a5497a2e366 10 *
jah128 0:8a5497a2e366 11 * Example:
jah128 0:8a5497a2e366 12 * @code
jah128 0:8a5497a2e366 13 * #include "psiswarm.h"
jah128 1:f6356cf1cefc 14 *
jah128 0:8a5497a2e366 15 * int main() {
jah128 0:8a5497a2e366 16 * init();
jah128 0:8a5497a2e366 17 * write_eeprom_byte(0,0xDD); //Writes byte 0xDD in EPROM address 0
jah128 0:8a5497a2e366 18 * char c = read_eeprom_byte(0); //c will hold 0xDD
jah128 0:8a5497a2e366 19 * //Valid address range is from 0 to 65279
jah128 0:8a5497a2e366 20 * }
jah128 0:8a5497a2e366 21 * @endcode
jah128 0:8a5497a2e366 22 */
jah128 1:f6356cf1cefc 23
jah128 1:f6356cf1cefc 24 #include "psiswarm.h"
jah128 0:8a5497a2e366 25
jah128 0:8a5497a2e366 26 /** Write a single byte to the EPROM
jah128 0:8a5497a2e366 27 *
jah128 0:8a5497a2e366 28 * @param address The address to store the data, range 0-65279
jah128 0:8a5497a2e366 29 * @param data The character to store
jah128 0:8a5497a2e366 30 */
jah128 1:f6356cf1cefc 31 void write_eeprom_byte ( int address, char data )
jah128 1:f6356cf1cefc 32 {
jah128 0:8a5497a2e366 33 char write_array[3];
jah128 1:f6356cf1cefc 34 if(address > 65279) {
jah128 1:f6356cf1cefc 35 debug("WARNING: Attempt to write to invalid EPROM address: %X",address);
jah128 1:f6356cf1cefc 36 } else {
jah128 1:f6356cf1cefc 37 write_array[0] = address / 256;
jah128 1:f6356cf1cefc 38 write_array[1] = address % 256;
jah128 1:f6356cf1cefc 39 write_array[2] = data;
jah128 1:f6356cf1cefc 40 primary_i2c.write(EEPROM_ADDRESS, write_array, 3, false);
jah128 1:f6356cf1cefc 41 //Takes 5ms to write a page: ideally this could be done with a timer or RTOS
jah128 1:f6356cf1cefc 42 wait(0.005);
jah128 0:8a5497a2e366 43 }
jah128 0:8a5497a2e366 44 }
jah128 1:f6356cf1cefc 45
jah128 0:8a5497a2e366 46 /** Read a single byte from the EPROM
jah128 0:8a5497a2e366 47 *
jah128 0:8a5497a2e366 48 * @param address The address to read from, range 0-65279
jah128 0:8a5497a2e366 49 * @return The character stored at address
jah128 1:f6356cf1cefc 50 */
jah128 1:f6356cf1cefc 51 char read_eeprom_byte ( int address )
jah128 1:f6356cf1cefc 52 {
jah128 0:8a5497a2e366 53 char address_array [2];
jah128 0:8a5497a2e366 54 address_array[0] = address / 256;
jah128 0:8a5497a2e366 55 address_array[1] = address % 256;
jah128 0:8a5497a2e366 56 char data [1];
jah128 0:8a5497a2e366 57 primary_i2c.write(EEPROM_ADDRESS, address_array, 2, false);
jah128 0:8a5497a2e366 58 primary_i2c.read(EEPROM_ADDRESS, data, 1, false);
jah128 0:8a5497a2e366 59 return data [0];
jah128 0:8a5497a2e366 60 }
jah128 0:8a5497a2e366 61
jah128 0:8a5497a2e366 62 /** Read the next byte from the EPROM, to be called after read_eeprom_byte
jah128 0:8a5497a2e366 63 *
jah128 0:8a5497a2e366 64 * @return The character stored at address after the previous one read from
jah128 0:8a5497a2e366 65 */
jah128 1:f6356cf1cefc 66 char read_next_eeprom_byte ()
jah128 1:f6356cf1cefc 67 {
jah128 0:8a5497a2e366 68 char data [1];
jah128 0:8a5497a2e366 69 primary_i2c.read(EEPROM_ADDRESS, data, 1, false);
jah128 0:8a5497a2e366 70 return data [0];
jah128 0:8a5497a2e366 71 }
jah128 0:8a5497a2e366 72
jah128 0:8a5497a2e366 73 /** Read the data stored in the reserved firmware area of the EPROM
jah128 0:8a5497a2e366 74 *
jah128 0:8a5497a2e366 75 * @return 1 if a valid firmware is read, 0 otherwise
jah128 0:8a5497a2e366 76 */
jah128 1:f6356cf1cefc 77 char read_firmware ()
jah128 1:f6356cf1cefc 78 {
jah128 0:8a5497a2e366 79 char address_array [2] = {255,0};
jah128 0:8a5497a2e366 80 primary_i2c.write(EEPROM_ADDRESS, address_array, 2, false);
jah128 2:a6214fd156ff 81 primary_i2c.read(EEPROM_ADDRESS, firmware_bytes, 21, false);
jah128 1:f6356cf1cefc 82
jah128 1:f6356cf1cefc 83 if(firmware_bytes[0] == PSI_BYTE) {
jah128 1:f6356cf1cefc 84 // Parse firmware
jah128 1:f6356cf1cefc 85 char firmware_string [8];
jah128 1:f6356cf1cefc 86 sprintf(firmware_string,"%d.%d",firmware_bytes[9],firmware_bytes[10]);
jah128 1:f6356cf1cefc 87 firmware_version = atof(firmware_string);
jah128 1:f6356cf1cefc 88 return 1;
jah128 1:f6356cf1cefc 89 }
jah128 0:8a5497a2e366 90 return 0;
jah128 0:8a5497a2e366 91 }