wayne roberts / Mbed OS i2c_slave_block_example

example of i2c slave device supporting block transfers

Dependencies:   lib_i2c_slave_block

Tested on nucleo board as slave. Use with i2c_master_block_example on raspberry pi as master.

Master I2C write will print on serial terminal 115200. User button will raise an irq; the RPi test program will service the interrupt.

See lib_i2c_slave_block for explanation of code.

cmds.h@3:0288d257446a, 2019-02-03 (annotated)

Committer:
Wayne Roberts
Date:
Sun Feb 03 16:56:15 2019 -0800
Revision:
3:0288d257446a
Parent:
2:d7e05c75f240 
indicate errors if reported by i2c

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Wayne Roberts 0:3ccfaf358115 1
Wayne Roberts 0:3ccfaf358115 2 #define CMD_TEST3 0x00
Wayne Roberts 0:3ccfaf358115 3 #define CMD_TEST12 0x01
Wayne Roberts 0:3ccfaf358115 4 #define CMD_TEST32 0x02
Wayne Roberts 0:3ccfaf358115 5 #define CMD_IRQ 0x03
Wayne Roberts 2:d7e05c75f240 6 #define CMD_BUFFER 0x04
Wayne Roberts 0:3ccfaf358115 7
Wayne Roberts 3:0288d257446a 8 #define CMD_TIMEOUT 0xfd // indication of smbus timeout
Wayne Roberts 3:0288d257446a 9 #define CMD_ARLO 0xfe // indication of arbitration lost
Wayne Roberts 3:0288d257446a 10 #define CMD_BUSERR 0xff // indication of start or stop during transfer
Wayne Roberts 3:0288d257446a 11
Wayne Roberts 0:3ccfaf358115 12 typedef union {
Wayne Roberts 0:3ccfaf358115 13 struct __attribute__((packed)) {
Wayne Roberts 0:3ccfaf358115 14 struct {
Wayne Roberts 0:3ccfaf358115 15 uint8_t button : 1; // 0
Wayne Roberts 0:3ccfaf358115 16 uint8_t xyz : 1; // 1
Wayne Roberts 0:3ccfaf358115 17 uint8_t res : 6; // 2,3,4,5,6,7
Wayne Roberts 0:3ccfaf358115 18 } flags;
Wayne Roberts 0:3ccfaf358115 19 uint8_t cnt; // if flags.button
Wayne Roberts 0:3ccfaf358115 20 uint8_t a;
Wayne Roberts 0:3ccfaf358115 21 int8_t b;
Wayne Roberts 0:3ccfaf358115 22 int8_t c;
Wayne Roberts 0:3ccfaf358115 23 } fields;
Wayne Roberts 0:3ccfaf358115 24 uint8_t buf[5];
Wayne Roberts 0:3ccfaf358115 25 } irq_t;
Wayne Roberts 0:3ccfaf358115 26
Wayne Roberts 0:3ccfaf358115 27 extern const uint8_t cmd_to_length[];