hello everyone:
I have a board that use PXA250 and the system base on
kernel-2.4.18-rmk7-pxa1. On the board, we connect SSPC with ADS7843, and
we use ads7843 connect to a touch screen. I want to write a driver for
SSP.
first, I tested the SSP in Loop-Back Mode, in this mode when datas is
sent to transmit FIFO, immediately datas will be transfored from
transmit FIFO to recevie FIFO, dosen't it. Unfortunately, it dosen't
work, whenever i sent any datas to transmit FIFO by setting SSDR (SSDR =
datas), the register SSSR[TFL] is increasing, the SSDR always is zero.
when SSSR[TFL] is high than transmit FIFO threshold, the SSSR[TFS] is
set to zero and can not generate transmit interrupt at all. In fact, the
recevie interrupt never be generate, for the SSSR[RFS] always is zero. I
set the SSP control Register like this:
SSCR0[SCR] = 255
SSCR0[SSE] = 1
SSCR0[ECS] = 0
SSCR0[FRF] = 0 //work on SPI mode
SSCR0[DSS] = 15
SSCR1[RFT] = 2
SSCR1[TFT] = 8
SSCR1[MWDS] = 1
SSCR1[SPH] = 0
SSCR1[SPO] = 1
SSCR1[LBM] = 1 //Loop-Back Mode
SSCR1[TIE] = 1 //generate transmit interrupt
SSCR1[RIE] = 1 //generate recevie interrupt
what's wrong with me?
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