怎么实现SPI接口来读取ADC值？

我想用斯巴达3e板和。
该板具有Linear Tech LTC1407A-1双A / D和Linear Tech LTC6912-1双通道。
请帮忙...



以下为原文

I want to use spartan3e board's a/d. The board has Linear Tech LTC1407A-1 Dual A/D and Linear Tech LTC6912-1 Dual Amp.
 
Please help...

嗨，我正在做同样的任务，而我从ADC获取数据bt我正在使用micrlaze处理器为此目的...
您提到的相同套件和相同的ADC编号......
我也使用带有SPI接口的EDK 10.1我可以将它连接到microblaze处理器..
我建议你从ip catelogue找出SPI接口，而不是编写VHDL代码，因为它是一种简单的方法来实现它
谢谢



以下为原文

hi i am doing the same task while i am to take data from ADC bt i am using microblaze processor for this purpose...
the same kit and the same ADC number u mentioned...
i am also using EDK 10.1 with SPI interface i can connect it to microblaze processor..
i suggest u to find out the SPI interface from the ip catelogue instead of writing VHDL code as its an easy way to implement it
thanks

嗨kajulkumar
你同时使用放大器和ADC ??
我也试图使用XPS SPI内核并连接放大器和ADC，但我有一些疑问
- 我可以将一个XPS SPI内核用于ADC和放大器吗？
或者必须为每一个使用一个XPS SPI？
- 放大器有芯片使能信号，但ADC只有SCK和MISO信号，或者AD_CONV信号被认为有芯片使能？
谢谢你的回答
问候



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hi  kajulkumar
 
You use both the amplifier and the ADC??
 
i am trying to use also XPS SPI core and connect both amplifier and the ADC, but i have some doubts
 
- Can i use one XPS SPI core for ADC and amplifier?? or have to use one XPS SPI for each one??
- the amplifier has a chip enable signal but the ADC only has SCK and MISO signals, or the AD_CONV signal is considered has chip enable??
 
thanks for your answers
 
regards

喜。，
任何可以帮助我的人



以下为原文

hi.,
 
anyone that can help me please

LTC ADC没有经典的SPI接口，但您应该在调整低级SPI内核以控制LTC器件方面遇到一些麻烦。
COND引脚执行类似于传统SPI器件的SELn信号的功能是正确的，但需要一些额外的协调SPI时钟控制来传达'start convert'，'nap'和'sleep'命令。
吉姆布拉迪的代码非常小，你看了它的起点吗？
编写一个更高级别的状态机来控制低级SPI控制器，而不是使用PicoBlaze，应该非常简单。
在与放大器通信时将CONV引脚驱动为高电平将导致ADC停止转换，这可能不是您想要发生的。
因此，ADC的专用SPI_CLK和SPI_MOSI可能是谨慎的。
如果在执行转换时与SPI连接的放大器进行通信，则应选择两个独立的SPI接口。
如果在敲击ADC时不与放大器通信，则使用单个SPI接口应该不是问题。
- 鲍勃埃尔金德
签名：新手的自述文件在这里：http：//forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369总结：1。
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以下为原文

The LTC ADC does not have a classic SPI interface, but you should have little trouble adapting a low-level SPI core to control the LTC device.  You are correct that the CONV pin performs a function similar to the SELn signal of a classic SPI device, but some additional coordinated SPI clock control is required to convey 'start convert', 'nap', and 'sleep' commands.
 
Jim Brady's code is pretty small, have you looked at it for a starting point?
 
Coding up a higher-level state machine to control the low-level SPI controller, instead of using a PicoBlaze, should be pretty straightforward.
 
Driving the CONV pin HIGH while communicating with the amplifier will  cause the ADC to stop converting, and this may not be what you want to  happen.  For this reason, a dedicated SPI_CLK and SPI_MOSI for the ADC  may be prudent.  If you are communicating with the SPI-connected amplifier while performing conversions, you should choose two separate SPI interfaces.  If you don't communicate with the amplifier while banging on the ADC, using a single SPI interface should not be a problem.
 
- Bob Elkind
 
 
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感谢您的回复，我将尝试您建议的VHDL代码。
我虽然可以使用XPS_SPI核心，因为kajulkumar发布他用micrlaze制作它。
另一个问题，那么XPS_DeltaSigma核心何时被使用??，在什么样的“硬件”？
再次感谢



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thanks for your response, i will try the VHDL code that you suggest.
 
I though i can use XPS_SPI core because  kajulkumar posted that he made it with microblaze.
 
Another question, so XPS_DeltaSigma core when is used??, in what kind of "hardware"??
 
thanks again

首先，你应该确保你已经成功地获得了收益。其次，你最好放慢速度。
由于时间紧张，很难从spi捕获数据。仔细阅读数据表，ad1407a在spi clk上升沿后至少8 ns输出数据。你可能会对某些信号实施约束。
祝你好运。



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First ,you should make sure you have sent the gain succesfully.Second , you'd better slow down the clk .
It's hard to capture the data from ad throuh spi because the timing is tight.Read the datasheet carefully,ad1407a  outputs data  at least  8 ns after rising edge of spi clk.you may implement constrains on some signals. good luck.

你可以参考spartan 3an的用户指南，我也做同样的事情，如果你在spartan3an找到关于spi的信息请发邮件给我



以下为原文

you can refer the user guide of spartan 3an and i am also doing same thing ,if you found the information about spi in spartan3an please mail me

rabil.310@gmail.com写道：
如果您在spartan3an中找到有关spi的信息，请发邮件给我
FPGA中的SPI仅仅是移位寄存器。
----------------------------是的，我这样做是为了谋生。



以下为原文

rabil.310@gmail.com wrote:
,if you found the information about spi in spartan3an please mail me

SPI in an FPGA is little more than a shift register.
----------------------------Yes, I do this for a living.