i2c newbie help

[ian]

Hi julky,

This is such a strange problem, I've never encountered it before.

Bus Hi-Z 1
MOSI OK
CLK OK
MISO OK
CS OK

This is a test of the pull-up resistors. They are enabled, and the jumper from +5 to Vpu holds these pins high. If this part of the test is OK, then you are definitely getting power on the pins through the pull-ups.

Are you powering the external device from the Bus Pirate? What voltage is the external device?

I'm sorry, I'm stabbing in the dark a bit, I'm not sure at all what the problem could be.

These are both Seeed Bus Pirates?

[julky]

It is a Seed BP, but I think the problem was due to a poltergeist :P

One more test with the same eeprom powered from the BP +3,3v, now the problem seems to have solved:

I2C>i
Bus Pirate v3
Firmware v4.1 Bootloader v4.1
DEVID:0x0447 REVID:0x3043 (B5)
http://dangerousprototypes.com
*----------*
POWER SUPPLIES ON
Voltage monitors: 5V: 5.09 | 3.3V: 3.29 | VPULLUP: 3.30 |
a/A/@ controls AUX pin
Open drain outputs (H=Hi-Z, L=GND)
Pull-up resistors ON
Bitorder configuration not allowed
*----------*
I2C>(1)
Searching 7bit I2C address space.
   Found devices at:
0xA0(0x50 W) 0xA1(0x50 R)
I2C>(1)
Searching 7bit I2C address space.
   Found devices at:
0xA0(0x50 W) 0xA1(0x50 R)
I2C>p
 1. Pull-ups off
 2. Pull-ups on
(1) >1
Pull-up resistors OFF
I2C>(1)
Searching 7bit I2C address space.
   Found devices at:
0x00(0x00 W) 0x01(0x00 R) 0x02(0x01 W) 0x03(0x01 R) 0x04(0x02 W) 0x05(0x02 R) 0x06(0x03 W) 0x07(0x03 R) 0x08(0x04 W) 0x09(0x04 R) 0x0A(0x05 W) 0x0B(0x05 R) 0x0C(0x06 W) 0x0D(0x06 R) 0x0E(0x07 W) 0x0F(0x07 R) 0x10(0x08 W) 0x11(0x08 R) 0x12(0x09 W) 0x13(0x09 R) 0x14(0x0A W) 0x15(0x0A R) 0x16(0x0B W) 0x17(0x0B R) 0x18(0x0C W) 0x19(0x0C R) 0x1A(0x0D W) 0x1B(0x0D R) 0x1C(0x0E W) 0x1D(0x0E R) 0x1E(0x0F W) 0x1F(0x0F R) 0x20(0x10 W) 0x21(0x10 R) 0x22(0x11 W) 0x23(0x11 R) 0x24(0x12 W) 0x25(0x12 R) 0x26(0x13 W) 0x27(0x13 R) 0x28(0x14 W) 0x29(0x14 R) 0x2A(0x15 W) 0x2B(0x15 R) 0x2C(0x16 W) 0x2D(0x16 R) 0x2E(0x17 W) 0x2F(0x17 R) 0x30(0x18 W) 0x31(0x18 R) 0x32(0x19 W) 0x33(0x19 R) 0x34(0x1A W) 0x35(0x1A R) 0x36(0x1B W) 0x37(0x1B R) 0x38(0x1C W) 0x39(0x1C R) 0x3A(0x1D W) 0x3B(0x1D R) 0x3C(0x1E W) 0x3D(0x1E R) 0x3E(0x1F W) 0x3F(0x1F R) 0x40(0x20 W) 0x41(0x20 R) 0x42(0x21 W) 0x43(0x21 R) 0x44(0x22 W) 0x45(0x22 R) 0x46(0x23 W) 0x47(0x23 R) 0x48(0x24 W) 0x49(0x24 R) 0x4A(0x25 W) 0x4B(0x25 R) 0x4C(0x26 W) 0x4D(0x26 R) 0x4E(0x27 W) 0x4F(0x27 R) 0x50(0x28 W) 0x51(0x28 R) 0x52(0x29 W) 0x53(0x29 R) 0x54(0x2A W) 0x55(0x2A R) 0x56(0x2B W) 0x57(0x2B R) 0x58(0x2C W) 0x59(0x2C R) 0x5A(0x2D W) 0x5B(0x2D R) 0x5C(0x2E W) 0x5D(0x2E R) 0x5E(0x2F W) 0x5F(0x2F R) 0x60(0x30 W) 0x61(0x30 R) 0x62(0x31 W) 0x63(0x31 R) 0x64(0x32 W) 0x65(0x32 R) 0x66(0x33 W) 0x67(0x33 R) 0x68(0x34 W) 0x69(0x34 R) 0x6A(0x35 W) 0x6B(0x35 R) 0x6C(0x36 W) 0x6D(0x36 R) 0x6E(0x37 W) 0x6F(0x37 R) 0x70(0x38 W) 0x71(0x38 R) 0x72(0x39 W) 0x73(0x39 R) 0x74(0x3A W) 0x75(0x3A R) 0x76(0x3B W) 0x77(0x3B R) 0x78(0x3C W) 0x79(0x3C R) 0x7A(0x3D W) 0x7B(0x3D R) 0x7C(0x3E W) 0x7D(0x3E R) 0x7E(0x3F W) 0x7F(0x3F R) 0x80(0x40 W) 0x81(0x40 R) 0x82(0x41 W) 0x83(0x41 R) 0x84(0x42 W) 0x85(0x42 R) 0x86(0x43 W) 0x87(0x43 R) 0x88(0x44 W) 0x89(0x44 R) 0x8A(0x45 W) 0x8B(0x45 R) 0x8C(0x46 W) 0x8D(0x46 R) 0x8E(0x47 W) 0x8F(0x47 R) 0x90(0x48 W) 0x91(0x48 R) 0x92(0x49 W) 0x93(0x49 R) 0x94(0x4A W) 0x95(0x4A R) 0x96(0x4B W) 0x97(0x4B R) 0x98(0x4C W) 0x99(0x4C R) 0x9A(0x4D W) 0x9B(0x4D R) 0x9C(0x4E W) 0x9D(0x4E R) 0x9E(0x4F W) 0x9F(0x4F R) 0xA0(0x50 W) 0xA1(0x50 R) 0xA2(0x51 W) 0xA3(0x51 R) 0xA4(0x52 W) 0xA5(0x52 R) 0xA6(0x53 W) 0xA7(0x53 R) 0xA8(0x54 W) 0xA9(0x54 R) 0xAA(0x55 W) 0xAB(0x55 R) 0xAC(0x56 W) 0xAD(0x56 R) 0xAE(0x57 W) 0xAF(0x57 R) 0xB0(0x58 W) 0xB1(0x58 R) 0xB2(0x59 W) 0xB3(0x59 R) 0xB4(0x5A W) 0xB5(0x5A R) 0xB6(0x5B W) 0xB7(0x5B R) 0xB8(0x5C W) 0xB9(0x5C R) 0xBA(0x5D W) 0xBB(0x5D R) 0xBC(0x5E W) 0xBD(0x5E R) 0xBE(0x5F W) 0xBF(0x5F R) 0xC0(0x60 W) 0xC1(0x60 R) 0xC2(0x61 W) 0xC3(0x61 R) 0xC4(0x62 W) 0xC5(0x62 R) 0xC6(0x63 W) 0xC7(0x63 R) 0xC8(0x64 W) 0xC9(0x64 R) 0xCA(0x65 W) 0xCB(0x65 R) 0xCC(0x66 W) 0xCD(0x66 R) 0xCE(0x67 W) 0xCF(0x67 R) 0xD0(0x68 W) 0xD1(0x68 R) 0xD2(0x69 W) 0xD3(0x69 R) 0xD4(0x6A W) 0xD5(0x6A R) 0xD6(0x6B W) 0xD7(0x6B R) 0xD8(0x6C W) 0xD9(0x6C R) 0xDA(0x6D W) 0xDB(0x6D R) 0xDC(0x6E W) 0xDD(0x6E R) 0xDE(0x6F W) 0xDF(0x6F R) 0xE0(0x70 W) 0xE1(0x70 R) 0xE2(0x71 W) 0xE3(0x71 R) 0xE4(0x72 W) 0xE5(0x72 R) 0xE6(0x73 W) 0xE7(0x73 R) 0xE8(0x74 W) 0xE9(0x74 R) 0xEA(0x75 W) 0xEB(0x75 R) 0xEC(0x76 W) 0xED(0x76 R) 0xEE(0x77 W) 0xEF(0x77 R) 0xF0(0x78 W) 0xF1(0x78 R) 0xF2(0x79 W) 0xF3(0x79 R) 0xF4(0x7A W) 0xF5(0x7A R) 0xF6(0x7B W) 0xF7(0x7B R) 0xF8(0x7C W) 0xF9(0x7C R) 0xFA(0x7D W) 0xFB(0x7D R) 0xFC(0x7E W) 0xFD(0x7E R) 0xFE(0x7F W) 0xFF(0x7F R)
I2C>p
 1. Pull-ups off
 2. Pull-ups on
(1) >2
Pull-up resistors ON
I2C>(1)
Searching 7bit I2C address space.
   Found devices at:
0xA0(0x50 W) 0xA1(0x50 R)
I2C>[0xa1 r:50]
I2C START BIT
WRITE: 0xA1 ACK
READ 0x32 BYTES:
0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0xFF ACK 0x5A ACK 0xA5 ACK 0xFF ACK 0xFF ACK 0x00 ACK 0x00 ACK 0xFF ACK 0xFF ACK 0x60 ACK 0xA9 ACK 0x0B ACK 0xB8 ACK 0x0B ACK 0xD6 ACK 0x06 ACK 0x05 ACK 0x05 ACK 0x04 ACK 0x05 ACK 0x06 ACK 0x03 ACK 0xE8 ACK 0x0B NACK
I2C STOP BIT
I2C>#
RESET

Bus Pirate v3
Firmware v4.1 Bootloader v4.1
DEVID:0x0447 REVID:0x3043 (B5)
http://dangerousprototypes.com
HiZ>m
1. HiZ
2. 1-WIRE
3. UART
4. I2C
5. SPI
6. JTAG
7. RAW2WIRE
8. RAW3WIRE
9. PC KEYBOARD
10. LCD
(1) >4
Mode selected
Set speed:
 1. ~50KHz
 2. ~100KHz
 3. ~400KHz
(1) >
READY
I2C>p
 1. Pull-ups off
 2. Pull-ups on
(1) >2
Pull-up resistors ON
I2C>W
POWER SUPPLIES ON
I2C>(1)
Searching 7bit I2C address space.
   Found devices at:
0xA0(0x50 W) 0xA1(0x50 R)


Thanks for your help.