I2C1 function not available?

LUCIANC · December 30, 2015, 5:53am

I am using HelioBoard v1.1.

I have enable I2C1 function in QSYS, HPS peripherel setting (use io i2c1 set 1 = GPIO_57, GPIO_58 pin).

And I generate preloader, and create .dtb , then update into SD card.

After Linux boot, I use i2cdetect tool to check, found result as below,

Question:

what caused “i2c: controller timed out” ?
I can’t measure any I2C signal from GPIO_57 & GPIO_58. (from scope) why ?

root@cyclone5:~# uname -a
Linux cyclone5 3.10.31-ltsi-05151-gc8b20a4 #1 SMP Mon Aug 24 11:20:04 JST 2015 armv7l GNU/Linux
root@cyclone5:~# i2cdetect -y -r 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: – – – – – – – – – 0c – – –
10: – – – – – – – – – – – – – – – –
20: – – – – – – – – – – – – – – – –
30: – – – – – – – – – – – – – – – –
40: – – – – – – – – – – – – – – – –
50: – UU – – – – – – – – – 5b 5c – – –
60: – – – – – – – – UU – – – – – – –
70: – – – – – – – –
root@cyclone5:~# i2cdetect -y -r 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: i2c_designware ffc05000.i2c: controller timed out
– i2c_designware ffc05000.i2c: controller timed out
– i2c_designware ffc05000.i2c: controller timed out
– i2c_designware ffc05000.i2c: controller timed out
– ^Ci2c_designware ffc05000.i2c: controller timed out

root@cyclone5:~#

LUCIANC · December 30, 2015, 5:55am

PIN mux info from \spl_bsp\generated\pinmux_config_cyclone5.c

/* pin MUX configuration data /
unsigned long sys_mgr_init_table[CONFIG_HPS_PINMUX_NUM] = {
0, / EMACIO0 /
2, / EMACIO1 /
2, / EMACIO2 /
2, / EMACIO3 /
2, / EMACIO4 /
2, / EMACIO5 /
2, / EMACIO6 /
2, / EMACIO7 /
2, / EMACIO8 /
0, / EMACIO9 /
2, / EMACIO10 /
2, / EMACIO11 /
2, / EMACIO12 /
2, / EMACIO13 /
0, / EMACIO14 /
0, / EMACIO15 /
0, / EMACIO16 /
0, / EMACIO17 /
0, / EMACIO18 /
0, / EMACIO19 /
3, / FLASHIO0 /
0, / FLASHIO1 /
3, / FLASHIO2 /
3, / FLASHIO3 /
0, / FLASHIO4 /
0, / FLASHIO5 /
0, / FLASHIO6 /
0, / FLASHIO7 /
0, / FLASHIO8 /
3, / FLASHIO9 /
3, / FLASHIO10 /
3, / FLASHIO11 /
3, / GENERALIO0 /
3, / GENERALIO1 /
3, / GENERALIO2 /
3, / GENERALIO3 /
3, / GENERALIO4 /
3, / GENERALIO5 /
3, / GENERALIO6 /
3, / GENERALIO7 /
3, / GENERALIO8 /
2, / GENERALIO9 /
2, / GENERALIO10 /
0, / GENERALIO11 /
0, / GENERALIO12 /
0, / GENERALIO13 /
0, / GENERALIO14 /
3, / GENERALIO15 /
3, / GENERALIO16 /
2, / GENERALIO17 /
2, / GENERALIO18 /
0, / GENERALIO19 /
0, / GENERALIO20 /
0, / GENERALIO21 /
0, / GENERALIO22 /
0, / GENERALIO23 /
0, / GENERALIO24 /
0, / GENERALIO25 /
0, / GENERALIO26 /
0, / GENERALIO27 /
0, / GENERALIO28 /
0, / GENERALIO29 /
0, / GENERALIO30 /
0, / GENERALIO31 /
2, / MIXED1IO0 /
2, / MIXED1IO1 /
2, / MIXED1IO2 /
2, / MIXED1IO3 /
2, / MIXED1IO4 /
2, / MIXED1IO5 /
2, / MIXED1IO6 /
2, / MIXED1IO7 /
2, / MIXED1IO8 /
2, / MIXED1IO9 /
2, / MIXED1IO10 /
2, / MIXED1IO11 /
2, / MIXED1IO12 /
2, / MIXED1IO13 /
0, / MIXED1IO14 /
3, / MIXED1IO15 /
3, / MIXED1IO16 /
3, / MIXED1IO17 /
3, / MIXED1IO18 /
3, / MIXED1IO19 /
3, / MIXED1IO20 /
0, / MIXED1IO21 /
0, / MIXED2IO0 /
0, / MIXED2IO1 /
0, / MIXED2IO2 /
0, / MIXED2IO3 /
0, / MIXED2IO4 /
0, / MIXED2IO5 /
0, / MIXED2IO6 /
0, / MIXED2IO7 /
0, / GPLINMUX48 /
0, / GPLINMUX49 /
0, / GPLINMUX50 /
0, / GPLINMUX51 /
0, / GPLINMUX52 /
0, / GPLINMUX53 /
0, / GPLINMUX54 /
0, / GPLINMUX55 /
0, / GPLINMUX56 /
0, / GPLINMUX57 /
0, / GPLINMUX58 /
0, / GPLINMUX59 /
0, / GPLINMUX60 /
0, / GPLINMUX61 /
0, / GPLINMUX62 /
0, / GPLINMUX63 /
0, / GPLINMUX64 /
0, / GPLINMUX65 /
0, / GPLINMUX66 /
0, / GPLINMUX67 /
0, / GPLINMUX68 /
0, / GPLINMUX69 /
0, / GPLINMUX70 /
1, / GPLMUX0 /
1, / GPLMUX1 /
1, / GPLMUX2 /
1, / GPLMUX3 /
1, / GPLMUX4 /
1, / GPLMUX5 /
1, / GPLMUX6 /
1, / GPLMUX7 /
1, / GPLMUX8 /
1, / GPLMUX9 /
1, / GPLMUX10 /
1, / GPLMUX11 /
1, / GPLMUX12 /
1, / GPLMUX13 /
1, / GPLMUX14 /
1, / GPLMUX15 /
1, / GPLMUX16 /
1, / GPLMUX17 /
1, / GPLMUX18 /
1, / GPLMUX19 /
1, / GPLMUX20 /
1, / GPLMUX21 /
1, / GPLMUX22 /
1, / GPLMUX23 /
1, / GPLMUX24 /
1, / GPLMUX25 /
1, / GPLMUX26 /
1, / GPLMUX27 /
1, / GPLMUX28 /
1, / GPLMUX29 /
1, / GPLMUX30 /
1, / GPLMUX31 /
1, / GPLMUX32 /
1, / GPLMUX33 /
1, / GPLMUX34 /
1, / GPLMUX35 /
1, / GPLMUX36 /
1, / GPLMUX37 /
1, / GPLMUX38 /
1, / GPLMUX39 /
1, / GPLMUX40 /
1, / GPLMUX41 /
1, / GPLMUX42 /
1, / GPLMUX43 /
1, / GPLMUX44 /
1, / GPLMUX45 /
1, / GPLMUX46 /
1, / GPLMUX47 /
1, / GPLMUX48 /
1, / GPLMUX49 /
1, / GPLMUX50 /
1, / GPLMUX51 /
1, / GPLMUX52 /
1, / GPLMUX53 /
1, / GPLMUX54 /
1, / GPLMUX55 /
1, / GPLMUX56 /
1, / GPLMUX57 /
1, / GPLMUX58 /
1, / GPLMUX59 /
1, / GPLMUX60 /
1, / GPLMUX61 /
1, / GPLMUX62 /
1, / GPLMUX63 /
1, / GPLMUX64 /
1, / GPLMUX65 /
1, / GPLMUX66 /
1, / GPLMUX67 /
1, / GPLMUX68 /
1, / GPLMUX69 /
1, / GPLMUX70 /
0, / NANDUSEFPGA /
0, / UART0USEFPGA /
0, / RGMII1USEFPGA /
0, / SPIS0USEFPGA /
0, / CAN0USEFPGA /
0, / I2C0USEFPGA /
0, / SDMMCUSEFPGA /
0, / QSPIUSEFPGA /
0, / SPIS1USEFPGA /
0, / RGMII0USEFPGA /
0, / UART1USEFPGA /
0, / CAN1USEFPGA /
0, / USB1USEFPGA /
0, / I2C3USEFPGA /
0, / I2C2USEFPGA /
0, / I2C1USEFPGA /
0, / SPIM1USEFPGA /
0, / USB0USEFPGA /
0 / SPIM0USEFPGA */
};

helloman · August 9, 2016, 6:17pm

LUCIANC,

Have you resolved this issue? I am having a similar issue.

Thanks,

LUCIANC · August 10, 2016, 5:27am

You may need to add pull-up resistor with SDA & SCL pin.

And there should be at least 1 I2C slave on the bus.