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UM0851 Datasheet(PDF) 85 Page - STMicroelectronics

Part # UM0851
Description  SPEAr is a family of highly customizable ARM-based embedded
PDF  245 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0851 Datasheet(HTML) 85 Page - STMicroelectronics

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UM0851
Communication device drivers
Doc ID 16604 Rev 2
85/245
●
Test method
Build kernel with i2c support as module. After booting the SPEAr board insert i2c module
with different clock speeds (100,400 KHz):
insmod spr_i2c_syn.ko clock=100
insmod spr_i2c_syn.ko clock=400
Perform the measurement in this way:
time dd if=/dev/zero of=/dev/i2c-0 bs=16 count=1
time dd if=/dev/i2c-0 of=/dev/null bs=16 count=1
Note:
As per I2C slave device limitation (the EEPROM) bs must be maximum 16.
●
Test results
4.5.6
Known issues or limitations
●
10-bit addressing is not supported
●
Data transfer is supported only in interrupt mode. DMA mode is not supported by the
current driver.
Table 26.
I2C at clock speed=100
Size in
Bytes
Write
(time in sec)
Throughput
(kbps)
Size in
Bytes
Read
(time in sec)
Throughput
(kbps)
16
0.01
12.8
16
0.01
12.8
16
0.01
12.8
64
0.01
51.2
16
0.01
12.8
128
0.02
51.2
16
0.01
12.8
196
0.03
52.26666667
16
0.01
12.8
255
0.03
68
Table 27.
I2C at clock speed=400
Size in
Bytes
Write
(time in sec)
Throughput
(kbps)
Size in
Bytes
Read
(time in sec)
Throughput
(kbps)
16
0.005
25.6
16
0.005
25.6
16
0.005
25.6
64
0.01
51.2
16
0.005
25.6
128
0.01
102.4
16
0.005
25.6
196
0.01
156.8
16
0.005
25.6
255
0.02
102



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