Marek Trojan / Mbed 2 deprecated _8_KL46_M_simple_write

program for I2C master device

Dependencies:   mbed

Fork of I2C_HelloWorld_Mbed by mbed official

main.cpp@9:36fc715eb54c, 2015-12-17 (annotated)

Committer:
marcus255
Date:
Thu Dec 17 23:04:29 2015 +0000
Revision:
9:36fc715eb54c
Parent:
8:3e6945d5d9a1
Child:
10:39dd1d3508c3
I2C device selected by pushbuttons, sequential memory read, writting random data sequentially (works, but some troubles with addressing occurs)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
marcus255 4:1ec553356dcc 1 // I2C Master
marcus255 4:1ec553356dcc 2 #include "main.h"
marcus255 9:36fc715eb54c 3
marcus255 9:36fc715eb54c 4 int main()
marcus255 9:36fc715eb54c 5 {
marcus255 4:1ec553356dcc 6 init();
marcus255 8:3e6945d5d9a1 7 wait_ms(1000);
marcus255 4:1ec553356dcc 8 while (1) {}
marcus255 4:1ec553356dcc 9 }
mbed_official 0:f76c26307f9a 10
marcus255 9:36fc715eb54c 11 void write_and_read()
marcus255 9:36fc715eb54c 12 {
marcus255 9:36fc715eb54c 13 if (routine == MEMORY_ROUTINE) {
marcus255 9:36fc715eb54c 14 write_data();
marcus255 9:36fc715eb54c 15 wait_ms(20);
marcus255 9:36fc715eb54c 16 read_data(&memory_cell_addr);
marcus255 9:36fc715eb54c 17 memory_cell_addr+=0x10;
marcus255 9:36fc715eb54c 18 } else if (routine == SENSOR_ROUTINE) {
marcus255 9:36fc715eb54c 19 rtc_sensor();
marcus255 9:36fc715eb54c 20 }
marcus255 9:36fc715eb54c 21 }
marcus255 8:3e6945d5d9a1 22
marcus255 8:3e6945d5d9a1 23 void rtc_sensor()
marcus255 8:3e6945d5d9a1 24 {
marcus255 8:3e6945d5d9a1 25 char temperature[2];
marcus255 9:36fc715eb54c 26 if(get_temperature_raw(temperature)) {
marcus255 9:36fc715eb54c 27 float result = proceed_temperature(temperature);
marcus255 9:36fc715eb54c 28 pc.printf("> Temperature: %1.2f\n\r",result);
marcus255 9:36fc715eb54c 29 wait_ms(5);
marcus255 9:36fc715eb54c 30 } else {
marcus255 9:36fc715eb54c 31 pc.printf("> I2C Error\n\r");
marcus255 9:36fc715eb54c 32 }
marcus255 8:3e6945d5d9a1 33 }
marcus255 8:3e6945d5d9a1 34
marcus255 9:36fc715eb54c 35 int get_temperature_raw(char* temperature)
marcus255 8:3e6945d5d9a1 36 {
marcus255 8:3e6945d5d9a1 37 char reg_addr = TEMPERATURE_REGISTER;
marcus255 9:36fc715eb54c 38 if(i2c.write(RTC_ADDR, &reg_addr, 1)) {
marcus255 9:36fc715eb54c 39 //pc.printf("Writing: Error\n\r");
marcus255 9:36fc715eb54c 40 return 0;
marcus255 9:36fc715eb54c 41 }
marcus255 8:3e6945d5d9a1 42 wait_ms(20);
marcus255 9:36fc715eb54c 43 if(i2c.read(RTC_ADDR, temperature, 2)) {
marcus255 9:36fc715eb54c 44 //pc.printf("Reading: Error\n\r");
marcus255 9:36fc715eb54c 45 return 0;
marcus255 9:36fc715eb54c 46 }
marcus255 9:36fc715eb54c 47 return 1;
marcus255 8:3e6945d5d9a1 48 }
marcus255 8:3e6945d5d9a1 49
marcus255 8:3e6945d5d9a1 50 float proceed_temperature(char * temperature)
marcus255 8:3e6945d5d9a1 51 {
marcus255 9:36fc715eb54c 52 char MSB = temperature[0]; // MSB is a signed int8 and carries temperature in accuracy of 1 Celsius degree
marcus255 8:3e6945d5d9a1 53 char LSB = temperature[1]; // LSB carries fraction part of temperature. Possible values are 0, 0.25, 0.5, 0.75
marcus255 8:3e6945d5d9a1 54 float high = (float)MSB;
marcus255 8:3e6945d5d9a1 55 float low = ((float)((uint8_t)LSB >> 6) * 0.25f);
marcus255 8:3e6945d5d9a1 56 return high + low;
marcus255 8:3e6945d5d9a1 57 }
marcus255 8:3e6945d5d9a1 58
marcus255 5:8dc6d7d81250 59
marcus255 9:36fc715eb54c 60 void write_data()
marcus255 9:36fc715eb54c 61 {
marcus255 9:36fc715eb54c 62 for (uint8_t i = 0; i < DATA_SIZE; i++) {
marcus255 9:36fc715eb54c 63 data[i+1] = (char) (rnd() % 90 + 33);
marcus255 4:1ec553356dcc 64 }
marcus255 9:36fc715eb54c 65 data[0] = memory_cell_addr;
marcus255 9:36fc715eb54c 66 if (i2c.write(SLAVE_ADDR, data, DATA_SIZE + 1)) {
marcus255 9:36fc715eb54c 67 pc.printf("> Writing: Error\n\r");
marcus255 9:36fc715eb54c 68 } else {
marcus255 9:36fc715eb54c 69 pc.printf("> Writing: OK\n\r");
marcus255 9:36fc715eb54c 70 }
marcus255 9:36fc715eb54c 71
marcus255 5:8dc6d7d81250 72 }
marcus255 5:8dc6d7d81250 73
marcus255 9:36fc715eb54c 74 void read_data(char* cell_addr)
marcus255 9:36fc715eb54c 75 {
marcus255 9:36fc715eb54c 76 int success = 1;
marcus255 9:36fc715eb54c 77 char fromSlave[DATA_SIZE + 1];
marcus255 9:36fc715eb54c 78 fromSlave[DATA_SIZE] = '\0';
marcus255 9:36fc715eb54c 79 if(i2c.write(SLAVE_ADDR, cell_addr, 1)) {
marcus255 9:36fc715eb54c 80 success = 0;
marcus255 7:b07706b16279 81 }
marcus255 9:36fc715eb54c 82 wait_ms(20);
marcus255 9:36fc715eb54c 83 if (success) {
marcus255 9:36fc715eb54c 84 if(i2c.read(SLAVE_ADDR, fromSlave, DATA_SIZE)) {
marcus255 9:36fc715eb54c 85 //pc.printf("Reading: Error\n\r");
marcus255 9:36fc715eb54c 86 success = 0;
marcus255 5:8dc6d7d81250 87 }
marcus255 9:36fc715eb54c 88 }
marcus255 9:36fc715eb54c 89 if (success) {
marcus255 9:36fc715eb54c 90 pc.printf("> Reading: OK, data at %#x is: %s\n\n\r", *cell_addr, fromSlave);
marcus255 9:36fc715eb54c 91 } else {
marcus255 9:36fc715eb54c 92 pc.printf("> Reading: Error\n\n\r");
marcus255 9:36fc715eb54c 93 }
marcus255 5:8dc6d7d81250 94 }
marcus255 9:36fc715eb54c 95
marcus255 9:36fc715eb54c 96 void init(void)
marcus255 9:36fc715eb54c 97 {
marcus255 9:36fc715eb54c 98 i2c.frequency(50000);
marcus255 9:36fc715eb54c 99 i2c_ticker.attach(&write_and_read, 2.0f);
marcus255 9:36fc715eb54c 100 left_but.rise(&memory_routine);
marcus255 9:36fc715eb54c 101 right_but.rise(&sensor_routine);
marcus255 9:36fc715eb54c 102 pc.baud(921600);
marcus255 9:36fc715eb54c 103 routine = MEMORY_ROUTINE;
marcus255 9:36fc715eb54c 104 memory_cell_addr = 0x00;
marcus255 9:36fc715eb54c 105 m_z=12434,m_w=33254;
marcus255 9:36fc715eb54c 106 }
mbed_official 0:f76c26307f9a 107
marcus255 9:36fc715eb54c 108 void memory_routine(void)
marcus255 9:36fc715eb54c 109 {
marcus255 9:36fc715eb54c 110 routine = MEMORY_ROUTINE;
marcus255 9:36fc715eb54c 111 }
marcus255 9:36fc715eb54c 112 void sensor_routine(void)
marcus255 9:36fc715eb54c 113 {
marcus255 9:36fc715eb54c 114 routine = SENSOR_ROUTINE;
marcus255 9:36fc715eb54c 115 }
marcus255 4:1ec553356dcc 116
marcus255 9:36fc715eb54c 117
marcus255 9:36fc715eb54c 118
marcus255 9:36fc715eb54c 119 unsigned int rnd()
marcus255 9:36fc715eb54c 120 {
marcus255 9:36fc715eb54c 121 m_z = 36969 * (m_z & 65535) + (m_z >>16);
marcus255 9:36fc715eb54c 122 m_w = 18000 * (m_w & 65535) + (m_w >>16);
marcus255 9:36fc715eb54c 123 return ((m_z <<16) + m_w);
marcus255 9:36fc715eb54c 124 }