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driver for 16x7X serial chip questions
Hi all,
Currently i'm working on a port of generic serial driver 16x5x for 16x7x (
particulary 16C750 )
Now i generate a repository for 16x7x drivers
So for the moment, i update register configuration in the file "
opt/ecos/ecos-1.3.1/packages/devs/serial/generic/16x7x/current/src/ser_16x7x.c"
I have some questions about these definitions :
// Interrupt Enable Register =====> i don't understand sense of
RCV,XMT,LS,MS , these terms do not appear in the documentation of my chips
specification in the "Interrupt Enable Register" Options
#define IER_RCV 0x01
#define IER_XMT 0x02
#define IER_LS 0x04
#define IER_MS 0x08
// Line Control Register ======> I haven't option like it !!
the only option i can have not use is : Bit 6 set : Break Control Bit = Forces
the transmitter to go low to alert the communication terminal
#define LCR_DL 0x40 // Enable baud rate latch
// Line Status Register
#define LSR_PE 0x80 //
bit 7 to 1 = 128d = 80h 16x5x = 04h
#define LSR_FE 0x80 //
bit 7 to 1 = 128d = 80h 16x5x = 08h
==> All the same bit ? they say : At least one parity error,framing error or
breaking error
#define LSR_BI 0x80 //
bit 7 to 1 = 128d = 80h 16x5x =
10h indication in the RX FIFO. Cleared when no more errors are
present in the FIFO
#define LSR_TEMT 0x40 I don't
understand this option
#define LSR_FIE 0x80 I
don't understand this option too :-)
// Modem Control Registerw
#define MCR_DTR 0x01 Don't
understant again, i have these options in this register: xon_en (enable
XON Any function), tcr_tlr and clksel (divide clock by four)
#define MCR_RTS 0x02
#define MCR_INT 0x08
// Interrupt status Register
#define ISR_MS 0x00 //
bit 0 to 0 = 00h 16x5x = 00h
====> An interrupt is pending ?
#define ISR_nIP 0x01 //
bit 0 to 1 = 01h 16x5x = 01h
====> No interrupt is pending ?
#define ISR_64BFIFO 0x20
#define ISR_FIFOworks 0x40 Not match
with my options :-( i have it_type ,fcr_mirror)
#define ISR_FIFOen 0x80
// Modem Status Register In my
documentation my chip read this register as zeros then I must make 0 in all
options ?
#define MSR_DCTS 0x00
#define MSR_DDSR 0x00
#define MSR_TERI 0x00
#define MSR_DDCD 0x00
#define MSR_CTS 0x00
#define MSR_DSR 0x00
#define MSR_RI 0x00
#define MSR_CD 0x00
// FIFO Control Register
#define FCR_DMA 0x08 // DMA mode select
#define FCR_F64 0x20 // Enable 64 byte fifo (16750+)
#define FCR_RT14 0xC0 // Set Rx trigger at 14 Don't
Match with options name in my documentation :-(
#define FCR_RT4 0x40 // Set Rx trigger at 4
#define FCR_RT1 0x00 // Set Rx trigger at 1
So i have another probleme, The base adress for these register is FFFF:0800
but where you defined it ?
It' here =========> ????
in
"/opt/ecos/ecos-1.3.1/packages/devs/serial/arm/ipphone/current/include/arm_arm7_ipphone_ser.inl"
static pc_serial_info ipphone_serial_info0 = {0x0D800000,
CYGNUM_HAL_INTERRUPT_SERIALA};
So i'm sorry for this long mail then i continue to search :-)
Sebastien.
best regards.