Date: Mon, 29 Apr 2019 11:34:34 -0600 From: Ian Lepore <ian@freebsd.org> To: Mori Hiroki <yamori813@yahoo.co.jp>, "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org> Subject: Re: spigen problem Message-ID: <22b68b094cbe7ab1b07673e43f6473906bd2d648.camel@freebsd.org> In-Reply-To: <1991993923.530828.1556558314174.JavaMail.yahoo@jws704008.mail.kks.yahoo.co.jp> References: <1991993923.530828.1556558314174.JavaMail.yahoo.ref@jws704008.mail.kks.yahoo.co.jp> <1991993923.530828.1556558314174.JavaMail.yahoo@jws704008.mail.kks.yahoo.co.jp>
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On Tue, 2019-04-30 at 02:18 +0900, Mori Hiroki wrote: > Hi > > I add small spi lcd on RT3050. This lcd controller is S6D0151. > > S6D0151 transfer is tree byte command then tree byte data. > > I use spigen mruby rapper. This rapper use SPIGENIOC_TRANSFER. > > I try to send tree byte command. But spi transfer is six byte. > > This is reason. > > sys/dev/spibus/spigen.c > > error = copyin(st->st_command.iov_base, transfer.tx_cmd, > transfer.tx_cmd_sz = transfer.rx_cmd_sz = st- > >st_command.iov_len); > > > This lcd not work six byte transfer. > > How do I fix this ? > > Regards > > Hiroki Mori > I'm not sure what you mean by "This is the reason", that code sets up the transfer for exactly as many bytes as you requested in st_command.iov_len. If you set that to three bytes, only three bytes will be transfered. -- Ian
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