Erick / Mbed 2 deprecated ICE-F412

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Dependencies:   mbed-rtos mbed

ICE-Application/src/Drivers/i2c_eeprom.cpp@1:b2e90cda7a5a, 2017-01-24 (annotated)

Committer:
jmarkel44
Date:
Tue Jan 24 19:06:45 2017 +0000
Revision:
1:b2e90cda7a5a
Parent:
0:61364762ee0e 
Port from IAR F412 project

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jmarkel44 0:61364762ee0e 1 /** @file i2c_eeprom.cpp */
jmarkel44 0:61364762ee0e 2 /*CPP**************************************************************************
jmarkel44 0:61364762ee0e 3 * FILENAME : i2c_eeprom.cpp *
jmarkel44 0:61364762ee0e 4 * *
jmarkel44 0:61364762ee0e 5 * DESCRIPTION : *
jmarkel44 0:61364762ee0e 6 * Simple library for external I2C EEEPROM. *
jmarkel44 0:61364762ee0e 7 * *
jmarkel44 0:61364762ee0e 8 * AUTHOR : Olli Vanhoja START DATE : 2011-02-17 *
jmarkel44 0:61364762ee0e 9 *****************************************************************************/
jmarkel44 0:61364762ee0e 10
jmarkel44 0:61364762ee0e 11 #include "mbed.h"
jmarkel44 0:61364762ee0e 12 #include "i2c_eeprom.h"
jmarkel44 0:61364762ee0e 13 #include "global.h"
jmarkel44 0:61364762ee0e 14
jmarkel44 0:61364762ee0e 15 I2C i2c_instance(I2C_SDA, I2C_SCL);
jmarkel44 0:61364762ee0e 16
jmarkel44 0:61364762ee0e 17 i2c_eeprom::i2c_eeprom(int hwAddr, int speed)
jmarkel44 0:61364762ee0e 18 {
jmarkel44 0:61364762ee0e 19 i_i2c_address = hwAddr;
jmarkel44 0:61364762ee0e 20 // i2c->frequency(speed);
jmarkel44 0:61364762ee0e 21 }
jmarkel44 0:61364762ee0e 22
jmarkel44 0:61364762ee0e 23 void i2c_eeprom::write(char *data, uint16_t iAddr, unsigned int n)
jmarkel44 0:61364762ee0e 24 {
jmarkel44 0:61364762ee0e 25 char *pi2c_data[3]; // Pointers for CW items
jmarkel44 0:61364762ee0e 26 char i2c_data[3]; // Final CW
jmarkel44 0:61364762ee0e 27
jmarkel44 0:61364762ee0e 28 /* Convert address to hi and low byte array
jmarkel44 0:61364762ee0e 29 * This is really pointless even though they are
jmarkel44 0:61364762ee0e 30 * called pointers it would be lot easier to do this
jmarkel44 0:61364762ee0e 31 * conversion without any pointers */
jmarkel44 0:61364762ee0e 32 uint16_t *piAddr = &iAddr;
jmarkel44 0:61364762ee0e 33 pi2c_data[0] = (char *)piAddr+1;
jmarkel44 0:61364762ee0e 34 pi2c_data[1] = (char *)piAddr;
jmarkel44 0:61364762ee0e 35
jmarkel44 0:61364762ee0e 36 for (uint16_t i=0; i < n; i++)
jmarkel44 0:61364762ee0e 37 {
jmarkel44 0:61364762ee0e 38 pi2c_data[2] = &data[i];
jmarkel44 0:61364762ee0e 39
jmarkel44 0:61364762ee0e 40 // Apply actual values from pointer
jmarkel44 0:61364762ee0e 41 //for (int n=0; n < 3; n++)
jmarkel44 0:61364762ee0e 42 // i2c_data[n] = *pi2c_data[n];
jmarkel44 0:61364762ee0e 43 i2c_data[0] = *pi2c_data[0];
jmarkel44 0:61364762ee0e 44 i2c_data[1] = *pi2c_data[1];
jmarkel44 0:61364762ee0e 45 i2c_data[2] = *pi2c_data[2];
jmarkel44 0:61364762ee0e 46
jmarkel44 0:61364762ee0e 47 // Send write command
jmarkel44 0:61364762ee0e 48 strwrite:
jmarkel44 0:61364762ee0e 49 // printf("(%s:%d): iAddr=0x%x, data=0x%x\r\n", __func__, __LINE__, iAddr, data[0]);
jmarkel44 0:61364762ee0e 50 if(i2c->write(i_i2c_address, i2c_data, 3))
jmarkel44 0:61364762ee0e 51 {
jmarkel44 0:61364762ee0e 52 autoreset();
jmarkel44 0:61364762ee0e 53 goto strwrite;
jmarkel44 0:61364762ee0e 54 }
jmarkel44 0:61364762ee0e 55
jmarkel44 0:61364762ee0e 56 iAddr++; // increment address counter
jmarkel44 0:61364762ee0e 57
jmarkel44 0:61364762ee0e 58 // Wait for ACK
jmarkel44 0:61364762ee0e 59 while(i2c->write(i_i2c_address, NULL, 0)){}
jmarkel44 0:61364762ee0e 60 }
jmarkel44 0:61364762ee0e 61 }
jmarkel44 0:61364762ee0e 62
jmarkel44 0:61364762ee0e 63 void i2c_eeprom::read(uint16_t iAddr, uint16_t n, char *out)
jmarkel44 0:61364762ee0e 64 {
jmarkel44 0:61364762ee0e 65 char *pi2c_data[2]; // Pointers for CW items
jmarkel44 0:61364762ee0e 66 char i2c_data[2]; // Final CW
jmarkel44 0:61364762ee0e 67
jmarkel44 0:61364762ee0e 68 uint16_t *piAddr = &iAddr;
jmarkel44 0:61364762ee0e 69 pi2c_data[0] = (char *)piAddr+1;
jmarkel44 0:61364762ee0e 70 pi2c_data[1] = (char *)piAddr;
jmarkel44 0:61364762ee0e 71
jmarkel44 0:61364762ee0e 72 // Apply actual values from pointer
jmarkel44 0:61364762ee0e 73 //for (int i=0; i < 2; i++)
jmarkel44 0:61364762ee0e 74 // i2c_data[i] = *pi2c_data[i];
jmarkel44 0:61364762ee0e 75 i2c_data[0] = *pi2c_data[0];
jmarkel44 0:61364762ee0e 76 i2c_data[1] = *pi2c_data[1];
jmarkel44 0:61364762ee0e 77
jmarkel44 0:61364762ee0e 78 // Send read command
jmarkel44 0:61364762ee0e 79 strread:
jmarkel44 0:61364762ee0e 80 if(i2c->write(i_i2c_address, i2c_data, 2))
jmarkel44 0:61364762ee0e 81 {
jmarkel44 0:61364762ee0e 82 autoreset();
jmarkel44 0:61364762ee0e 83 goto strread;
jmarkel44 0:61364762ee0e 84 }
jmarkel44 0:61364762ee0e 85 if(i2c->read(i_i2c_address, out, n))
jmarkel44 0:61364762ee0e 86 {
jmarkel44 0:61364762ee0e 87 autoreset();
jmarkel44 0:61364762ee0e 88 goto strread;
jmarkel44 0:61364762ee0e 89 }
jmarkel44 0:61364762ee0e 90 // printf("(%s:%d): iAddr=0x%x, data=0x%x\r\n", __func__, __LINE__, iAddr, *out);
jmarkel44 0:61364762ee0e 91 }
jmarkel44 0:61364762ee0e 92
jmarkel44 0:61364762ee0e 93 void i2c_eeprom::autoreset()
jmarkel44 0:61364762ee0e 94 {
jmarkel44 0:61364762ee0e 95 }
jmarkel44 0:61364762ee0e 96