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Results tagged with electrical-engineering
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user 2642
Study and applications of electricity, electronics, and electromagnetism. Use this tag when someone who has trained as an electrical engineer is likely to be able to answer your question.
7
votes
Accepted
Saving RAM Memory when writing to 2K page size NAND flash
You don't need to fill the page register all in one go.
You begin a page write (i.e. the "Page Program" operation) by writing the Serial Data Input command (0x80), the column address, and the row add …
- 1,092
7
votes
Accepted
In a device tree for AM335x, how do I know what pinctrl values to use?
To update your .dts file (that includes the file am335x-bone-common.dtsi) for a pinmux assignment, consult the datasheet to determine which pin(s) are assigned to a function. This is in section 4.3 ( …
- 1,092
6
votes
1
answer
158
views
Why are words bit-shifted for an Atmel SAM4S SPI slave?
I have discovered a problem when using the SPI peripheral in slave mode on an Atmel SAM4S. Occasionally words can become bit-shifted. I can force this condition by enabling the peripheral some numbe …
- 1,092
7
votes
1
answer
3k
views
In a device tree for AM335x, how do I know what pinctrl values to use?
In the Linux kernel's dtsi file (am335x-bone-common.dtsi) for the AM335x processor, there is the am33xx_pinmux tree, with values like this:
i2c0_pins: pinmux_i2c0_pins {
pinctrl-single,pi …
- 1,092
12
votes
1
answer
2k
views
How fast should I sample with a logic analyzer?
If I have a 10 MHz digital signal, how fast do I need to sample with a logic analyzer to avoid any bit errors? Does the minimum sample rate increase if I want to attach a protocol decoder (e.g. SPI)? …
- 1,092
5
votes
Accepted
Why are words bit-shifted for an Atmel SAM4S SPI slave?
This is due to the design of their SPI peripheral. In slave mode, the shift register is shifted each SPCK (assuming NSS is low and SPIENS is set). There is an internal counter (not shown in the bloc …
- 1,092
8
votes
1
answer
175
views
How can I increase my processor's ADC resolution?
I have an Atmel SAM4S MCU with a 12-bit internal ADC. I would like to achieve 16-bit resolution at a sample rate of 500 Hz. The input to the ADC is fairly low-frequency (about 20 Hz max frequency co …
- 1,092