On 23.10.2010 01:29, Stany MARCEL wrote: > On Sun, Oct 17, 2010 at 10:48 AM, Stany MARCEL <[email protected]> wrote: > >> On Sat, Oct 16, 2010 at 2:20 PM, Stany MARCEL <[email protected]> wrote: >> >>> Hello, >>> >>> I want to use the FT4232 or FT2232 (with libfti) as a SPI master. >>> >>> Thanks to you I have a good example of SPI code with libftdi and this >>> device since you added it to your supported flasher. >>> >>> I still don't know how to change some behavior of this component : >>> >>> - Clock mode >>> Mode 0: CPOL= 0 CPHA=0 >>> Mode 1: CPOL= 0 CPHA=1 >>> Mode 2: CPOL= 1 CPHA=0 >>> Mode 3: CPOL= 1 CPHA=1 >>> >>> - Data shift order, MSB or LSB First. >>> >>> If you have any information on theses subject, I'm very interested. >>> >>> Thanks in advance >>> >>> >>> Extract from FTDI Documentation : >>> For CPOL = 0, the base (inactive) level of SCLK is 0. In this mode: >>> * When CPHA = 0, data will be read in on the rising edge of SCLK, and >>> data will be clocked out on the falling edge of SCLK. >>> * When CPHA = 1, data will be read in on the falling edge of SCLK, >>> and data will clocked out on the rising edge of SCLK >>> For CPOL =1, the base (inactive) level of SCLK is 1. In this mode: >>> * When CPHA = 0, data will be read in on the falling edge of SCLK, >>> and data will clocked out on the rising edge of SCLK >>> * When CPHA =1, data will be read in on the rising edge of SCLK, and >>> data will be clocked out on the falling edge of SCLK. >>> >>> >> I found the needed informations in the SPI dll given by ftdi and the >> ftdi.h from libftdi.h >> >> #define SPI_CMD_WR_BYTES_MSB_RE /* 0001 0000 */ (MPSSE_DO_WRITE) >> #define SPI_CMD_WR_BYTES_MSB_FE /* 0001 0001 */ >> (MPSSE_DO_WRITE|MPSSE_WRITE_NEG) >> #define SPI_CMD_WR_BYTES_LSB_RE /* 0001 1000 */ (MPSSE_DO_WRITE|MPSSE_LSB) >> #define SPI_CMD_WR_BYTES_LSB_FE /* 0001 1001 */ >> (MPSSE_DO_WRITE|MPSSE_LSB|MPSSE_WRITE_NEG) >> >> #define SPI_CMD_RD_BYTES_MSB_RE /* 0010 0000 */ (MPSSE_DO_READ) >> #define SPI_CMD_RD_BYTES_MSB_FE /* 0010 0101 */ >> (MPSSE_DO_READ|MPSSE_READ_NEG|MPSSE_WRITE_NEG) >> #define SPI_CMD_RD_BYTES_LSB_RE /* 0010 1000 */ (MPSSE_DO_READ|MPSSE_LSB) >> #define SPI_CMD_RD_BYTES_LSB_FE /* 0010 1101 */ >> (MPSSE_DO_READ|MPSSE_LSB|MPSSE_READ_NEG|MPSSE_WRITE_NEG) >> >> I will test all theses modes with an oscilloscope to verify that it >> works as expected. >> > I have posted the first results of my work : > > http://code.google.com/p/libftdispi/ >
Nice. Maybe you want to tell the libftdi authors about your project as well. They like to know who is using their library. Regards, Carl-Daniel -- http://www.hailfinger.org/ _______________________________________________ flashrom mailing list [email protected] http://www.flashrom.org/mailman/listinfo/flashrom
