To: | [email protected], [email protected] |
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Subject: | Re: LF: PIC-based GPSDO with A/D converter / supported serial baudrates ? |
From: | Andy Talbot <[email protected]> |
Date: | Wed, 17 Feb 2016 15:23:42 +0000 |
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I've just made some tests on the FTDI232 chip at high baud rates. Using a custom routine written in PowerBasic (CC) , I used that language's own interpretation and interface to the driver to pass arbitrary baud rates to the chip. With the device set for 8 data, 1 stop bit and no parity, I repeatedly send the character 0x55 in a continuous loop. This pattern of bits, if sent contiguously (characters are sent LSB first) should therefore result in a square wave being generated at a frequency exactly equal to half the specified baud rate. The FTDI232 data sheet states that baud rates are determined based on a 3MHz input to a divisor of (N + M/8, where N = 2 to 16384, plus two special cases on N = 0 and N = 1 for 3Meg and 1Meg rates respectively. This setting is hidden from my application, and happens transparently based on the baud rate I specify beign passed to the driver via PowerBasic. The following results were obtained : Requested Frequency Baud rate Generated 1M 500000 2M On 12 February 2016 at 17:59, Wolfgang Büscher <[email protected]> wrote:
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