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Thread
2005-01-10 by tah2k
I'm writing the driver for the LPC2138 SSP block and I am encountering some strange behavior: First of all, the user manual states SSPCR1, SSPCPSR, and SSPIMSC are all reset to 0x0 upon powerup. I am finding the following values in these registers after reset: SSPCR1 (0xE005C004): 0xF8 SSPCPSR (0xE005C010): 0x04 SSPIMSC (0xE005C014): 0x04 The processor ignores any writes of any data value to these locations. Any ideas? -Tim
2005-01-11 by johnnorgaard2003
Hi Have you selected the SSP function in PINSEL0 or PINSEL1 ? best regards John --- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote:
> > I'm writing the driver for the LPC2138 SSP block and I am > encountering some strange behavior: > > First of all, the user manual states SSPCR1, SSPCPSR, and SSPIMSC > are all reset to 0x0 upon powerup. > > I am finding the following values in these registers after reset: > SSPCR1 (0xE005C004): 0xF8 > SSPCPSR (0xE005C010): 0x04 > SSPIMSC (0xE005C014): 0x04 > > The processor ignores any writes of any data value to these > locations. > > Any ideas? > > -Tim
2005-01-11 by tah2k
Yes, but it doesn't seem to matter. --- In lpc2000@yahoogroups.com, "johnnorgaard2003" <john_2005@c...> wrote: > > Hi > > Have you selected the SSP function in PINSEL0 or PINSEL1 ? > > > best regards > > John > > --- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote: > > > > I'm writing the driver for the LPC2138 SSP block and I am > > encountering some strange behavior: > > > > First of all, the user manual states SSPCR1, SSPCPSR, and SSPIMSC
> > are all reset to 0x0 upon powerup. > > > > I am finding the following values in these registers after reset: > > SSPCR1 (0xE005C004): 0xF8 > > SSPCPSR (0xE005C010): 0x04 > > SSPIMSC (0xE005C014): 0x04 > > > > The processor ignores any writes of any data value to these > > locations. > > > > Any ideas? > > > > -Tim
2005-01-11 by Charles R. Grenz
Hi, Do you have the slave select pin pull high? Charles
-----Original Message----- From: tah2k [mailto:tah2k@...] Sent: Tuesday, January 11, 2005 9:59 AM To: lpc2000@yahoogroups.com Subject: [lpc2000] Re: LPC2138: Strange SSP Behavior Yes, but it doesn't seem to matter. --- In lpc2000@yahoogroups.com, "johnnorgaard2003" <john_2005@c...> wrote: > > Hi > > Have you selected the SSP function in PINSEL0 or PINSEL1 ? > > > best regards > > John > > --- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote: > > > > I'm writing the driver for the LPC2138 SSP block and I am > > encountering some strange behavior: > > > > First of all, the user manual states SSPCR1, SSPCPSR, and SSPIMSC > > are all reset to 0x0 upon powerup. > > > > I am finding the following values in these registers after reset: > > SSPCR1 (0xE005C004): 0xF8 SSPCPSR (0xE005C010): 0x04 > > SSPIMSC (0xE005C014): 0x04 > > > > The processor ignores any writes of any data value to these > > locations. > > > > Any ideas? > > > > -Tim Yahoo! Groups Links
2005-01-11 by tah2k
It is pulled high, but the issue I am having is the memory locations themselves. --- In lpc2000@yahoogroups.com, "Charles R. Grenz" <charles.grenz@s...> wrote: > Hi, > > Do you have the slave select pin pull high? > > > Charles > > > > -----Original Message----- > From: tah2k [mailto:tah2k@y...] > Sent: Tuesday, January 11, 2005 9:59 AM > To: lpc2000@yahoogroups.com > Subject: [lpc2000] Re: LPC2138: Strange SSP Behavior > > > > > Yes, but it doesn't seem to matter. > > --- In lpc2000@yahoogroups.com, "johnnorgaard2003" <john_2005@c...> > wrote: > > > > Hi > > > > Have you selected the SSP function in PINSEL0 or PINSEL1 ? > > > > > > best regards > > > > John > > > > --- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote: > > > > > > I'm writing the driver for the LPC2138 SSP block and I am > > > encountering some strange behavior: > > > > > > First of all, the user manual states SSPCR1, SSPCPSR, and > SSPIMSC > > > are all reset to 0x0 upon powerup. > > > > > > I am finding the following values in these registers after reset:
> > > SSPCR1 (0xE005C004): 0xF8 SSPCPSR (0xE005C010): 0x04 > > > SSPIMSC (0xE005C014): 0x04 > > > > > > The processor ignores any writes of any data value to these > > > locations. > > > > > > Any ideas? > > > > > > -Tim > > > > > > > Yahoo! Groups Links
2005-01-11 by Charles R. Grenz
Hi Was just wondering. I have seen strange behavior from the SPI on a 2106 from time to time related to the slave select (may have also been the programmer!). I would double check all your clock and divider settings. Any other registers you are having trouble with as well? Have you tried writing or reading from the standard SPI? I'm interested in this because I will be using the SSP very soon myself. Regards, Charles
-----Original Message----- From: tah2k [mailto:tah2k@...] Sent: Tuesday, January 11, 2005 11:16 AM To: lpc2000@yahoogroups.com Subject: [lpc2000] Re: LPC2138: Strange SSP Behavior It is pulled high, but the issue I am having is the memory locations themselves. --- In lpc2000@yahoogroups.com, "Charles R. Grenz" <charles.grenz@s...> wrote: > Hi, > > Do you have the slave select pin pull high? > > > Charles > > > > -----Original Message----- > From: tah2k [mailto:tah2k@y...] > Sent: Tuesday, January 11, 2005 9:59 AM > To: lpc2000@yahoogroups.com > Subject: [lpc2000] Re: LPC2138: Strange SSP Behavior > > > > > Yes, but it doesn't seem to matter. > > --- In lpc2000@yahoogroups.com, "johnnorgaard2003" <john_2005@c...> > wrote: > > > > Hi > > > > Have you selected the SSP function in PINSEL0 or PINSEL1 ? > > > > > > best regards > > > > John > > > > --- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote: > > > > > > I'm writing the driver for the LPC2138 SSP block and I am > > > encountering some strange behavior: > > > > > > First of all, the user manual states SSPCR1, SSPCPSR, and > SSPIMSC > > > are all reset to 0x0 upon powerup. > > > > > > I am finding the following values in these registers after reset: > > > SSPCR1 (0xE005C004): 0xF8 SSPCPSR (0xE005C010): 0x04 SSPIMSC > > > (0xE005C014): 0x04 > > > > > > The processor ignores any writes of any data value to these > > > locations. > > > > > > Any ideas? > > > > > > -Tim > > > > > > > Yahoo! Groups Links Yahoo! Groups Links
2005-01-11 by beedward2
I would check the addresses for the SSP control registers. The user manual I have (11/22/04) has the following addresses: SSPCR1 : 0xE0068004 SSPCPSR : 0xE0068010 SSPIMSC : 0xE0068014 The addresses you specify map to the I2C port. 0xE005C004 = I2C1STAT; 0xF8 at reset 0xE005C010 = I2C1SCLH; 0x04 at reset 0xE005C014 = I2C1SCLL; 0x04 at reset I think this explains your problem. Good luck, Ben --- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote:
> > It is pulled high, but the issue I am having is the memory locations > themselves. > > --- In lpc2000@yahoogroups.com, "Charles R. Grenz" > <charles.grenz@s...> wrote: > > Hi, > > > > Do you have the slave select pin pull high? > > > > > > Charles > > > > > > > > -----Original Message----- > > From: tah2k [mailto:tah2k@y...] > > Sent: Tuesday, January 11, 2005 9:59 AM > > To: lpc2000@yahoogroups.com > > Subject: [lpc2000] Re: LPC2138: Strange SSP Behavior > > > > > > > > > > Yes, but it doesn't seem to matter. > > > > --- In lpc2000@yahoogroups.com, "johnnorgaard2003" > <john_2005@c...> > > wrote: > > > > > > Hi > > > > > > Have you selected the SSP function in PINSEL0 or PINSEL1 ? > > > > > > > > > best regards > > > > > > John > > > > > > --- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote: > > > > > > > > I'm writing the driver for the LPC2138 SSP block and I am > > > > encountering some strange behavior: > > > > > > > > First of all, the user manual states SSPCR1, SSPCPSR, and > > SSPIMSC > > > > are all reset to 0x0 upon powerup. > > > > > > > > I am finding the following values in these registers after > reset: > > > > SSPCR1 (0xE005C004): 0xF8 SSPCPSR (0xE005C010): 0x04 > > > > SSPIMSC (0xE005C014): 0x04 > > > > > > > > The processor ignores any writes of any data value to these > > > > locations. > > > > > > > > Any ideas? > > > > > > > > -Tim > > > > > > > > > > > > > > Yahoo! Groups Links
2005-01-11 by tah2k
Yes! Your right. My User Manual is dated August 25, 2004 and both the I2C and SSP have the same base address! Thanks a bunch- Tim --- In lpc2000@yahoogroups.com, "beedward2" <ben.edwards@u...> wrote: > > I would check the addresses for the SSP control registers. The user > manual I have (11/22/04) has the following addresses: > SSPCR1 : 0xE0068004 > SSPCPSR : 0xE0068010 > SSPIMSC : 0xE0068014 > > The addresses you specify map to the I2C port. > > 0xE005C004 = I2C1STAT; 0xF8 at reset > 0xE005C010 = I2C1SCLH; 0x04 at reset > 0xE005C014 = I2C1SCLL; 0x04 at reset > > I think this explains your problem. > > Good luck, > Ben > > > --- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote: > > > > It is pulled high, but the issue I am having is the memory locations
> > themselves. > > > > --- In lpc2000@yahoogroups.com, "Charles R. Grenz" > > <charles.grenz@s...> wrote: > > > Hi, > > > > > > Do you have the slave select pin pull high? > > > > > > > > > Charles > > > > > > > > > > > > -----Original Message----- > > > From: tah2k [mailto:tah2k@y...] > > > Sent: Tuesday, January 11, 2005 9:59 AM > > > To: lpc2000@yahoogroups.com > > > Subject: [lpc2000] Re: LPC2138: Strange SSP Behavior > > > > > > > > > > > > > > > Yes, but it doesn't seem to matter. > > > > > > --- In lpc2000@yahoogroups.com, "johnnorgaard2003" > > <john_2005@c...> > > > wrote: > > > > > > > > Hi > > > > > > > > Have you selected the SSP function in PINSEL0 or PINSEL1 ? > > > > > > > > > > > > best regards > > > > > > > > John > > > > > > > > --- In lpc2000@yahoogroups.com, "tah2k" <tah2k@y...> wrote: > > > > > > > > > > I'm writing the driver for the LPC2138 SSP block and I am > > > > > encountering some strange behavior: > > > > > > > > > > First of all, the user manual states SSPCR1, SSPCPSR, and > > > SSPIMSC > > > > > are all reset to 0x0 upon powerup. > > > > > > > > > > I am finding the following values in these registers after > > reset: > > > > > SSPCR1 (0xE005C004): 0xF8 SSPCPSR (0xE005C010): 0x04 > > > > > SSPIMSC (0xE005C014): 0x04 > > > > > > > > > > The processor ignores any writes of any data value to these > > > > > locations. > > > > > > > > > > Any ideas? > > > > > > > > > > -Tim > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links