mirror of
https://github.com/netfun2000/lcd4linux.git
synced 2026-02-27 09:44:34 +08:00
[lcd4linux @ 2006-08-10 20:40:46 by reinelt]
M50530 enhancements: Timings, busy-flag checking git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@687 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
This commit is contained in:
reinelt
+6
-3
@@ -1,4 +1,4 @@
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/* $Id: drv_HD44780.c,v 1.63 2006/07/29 20:59:12 lfcorreia Exp $
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/* $Id: drv_HD44780.c,v 1.64 2006/08/10 20:40:46 reinelt Exp $
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*
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* new style driver for HD44780-based displays
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*
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@@ -32,6 +32,9 @@
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*
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*
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* $Log: drv_HD44780.c,v $
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* Revision 1.64 2006/08/10 20:40:46 reinelt
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* M50530 enhancements: Timings, busy-flag checking
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*
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* Revision 1.63 2006/07/29 20:59:12 lfcorreia
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* Fix wrong timing at I2C initialization
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*
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@@ -490,7 +493,7 @@ static void drv_HD_PP_busy(const int controller)
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/* get the current time */
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gettimeofday(&now, NULL);
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if (now.tv_sec == end.tv_sec ? now.tv_usec >= end.tv_usec : now.tv_sec >= end.tv_sec) {
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error("%s: timeout waiting for busy flag on controller %x (%x)", Name, ctrlmask, data);
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error("%s: timeout waiting for busy flag on controller %x (0x%02x)", Name, ctrlmask, data);
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if (++errors >= MAX_BUSYFLAG_ERRORS) {
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error("%s: too many busy flag failures, turning off busy flag checking.", Name);
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UseBusy = 0;
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@@ -1486,7 +1489,7 @@ int drv_HD_init(const char *section, const int quiet)
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int asc255bug;
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int ret;
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info("%s: %s", Name, "$Revision: 1.63 $");
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info("%s: %s", Name, "$Revision: 1.64 $");
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/* display preferences */
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XRES = 5; /* pixel width of one char */
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+172
-25
@@ -1,4 +1,4 @@
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/* $Id: drv_M50530.c,v 1.21 2006/01/30 06:25:53 reinelt Exp $
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/* $Id: drv_M50530.c,v 1.22 2006/08/10 20:40:46 reinelt Exp $
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*
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* new style driver for M50530-based displays
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*
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@@ -23,6 +23,9 @@
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*
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*
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* $Log: drv_M50530.c,v $
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* Revision 1.22 2006/08/10 20:40:46 reinelt
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* M50530 enhancements: Timings, busy-flag checking
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*
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* Revision 1.21 2006/01/30 06:25:53 reinelt
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* added CVS Revision
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*
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@@ -149,6 +152,12 @@ static char Name[] = "M50530";
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static int Model;
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/* Timings */
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static int T_SU, T_W, T_D, T_H;
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static int T_INIT, T_EXEC, T_CLEAR;
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static int T_GPO_ST, T_GPO_PW;
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static unsigned char SIGNAL_RW;
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static unsigned char SIGNAL_EX;
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static unsigned char SIGNAL_IOC1;
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static unsigned char SIGNAL_IOC2;
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@@ -158,6 +167,15 @@ static int FONT5X11;
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static int DDRAM;
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static int DUTY;
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/* maximum time to wait for the busy-flag (in usec) */
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#define MAX_BUSYFLAG_WAIT 10000
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/* maximum busy flag errors before falling back to busy-waiting */
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#define MAX_BUSYFLAG_ERRORS 20
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/* flag for busy-waiting vs. busy flag checking */
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static int UseBusy = 0;
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/* buffer holding the GPO state */
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static unsigned char GPO = 0;
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@@ -177,34 +195,120 @@ static MODEL Models[] = {
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/*** hardware dependant functions ***/
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/****************************************/
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static void drv_M5_busy(void)
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{
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static unsigned int errors = 0;
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unsigned char data = 0xFF;
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unsigned char busymask = 0x88;
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unsigned int counter;
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/* set data-lines to input */
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drv_generic_parport_direction(1);
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/* clear I/OC1 and I/OC2, set R/W */
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drv_generic_parport_control(SIGNAL_IOC1 | SIGNAL_IOC2 | SIGNAL_RW, SIGNAL_RW);
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/* Control data setup time */
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ndelay(T_SU);
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counter = 0;
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while (1) {
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/* rise enable */
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drv_generic_parport_control(SIGNAL_EX, SIGNAL_EX);
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/* data output delay time */
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ndelay(T_D);
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/* read the busy flag */
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data = drv_generic_parport_read();
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/* lower enable */
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/* as T_D is larger than T_W, we don't need to delay again */
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drv_generic_parport_control(SIGNAL_EX, 0);
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if ((data & busymask) == 0) {
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errors = 0;
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break;
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}
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/* make sure we don't wait forever
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* - but only check after 5 iterations
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* that way, we won't slow down normal mode
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* (where we don't need the timeout anyway)
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*/
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counter++;
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if (counter >= 5) {
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struct timeval now, end;
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if (counter == 5) {
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/* determine the time when the timeout has expired */
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gettimeofday(&end, NULL);
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end.tv_usec += MAX_BUSYFLAG_WAIT;
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while (end.tv_usec > 1000000) {
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end.tv_usec -= 1000000;
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end.tv_sec++;
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}
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}
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/* get the current time */
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gettimeofday(&now, NULL);
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if (now.tv_sec == end.tv_sec ? now.tv_usec >= end.tv_usec : now.tv_sec >= end.tv_sec) {
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error("%s: timeout waiting for busy flag (0x%02x)", Name, data);
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if (++errors >= MAX_BUSYFLAG_ERRORS) {
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error("%s: too many busy flag failures, turning off busy flag checking.", Name);
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UseBusy = 0;
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}
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break;
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}
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}
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}
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/* clear R/W */
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drv_generic_parport_control(SIGNAL_RW, 0);
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/* set data-lines to output */
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drv_generic_parport_direction(0);
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}
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static void drv_M5_command(const unsigned int cmd, const int delay)
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{
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if (UseBusy)
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drv_M5_busy();
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/* put data on DB1..DB8 */
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drv_generic_parport_data(cmd & 0xff);
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/* set I/OC1 */
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/* set I/OC2 */
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drv_generic_parport_control(SIGNAL_IOC1 | SIGNAL_IOC2,
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/* clear RW */
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drv_generic_parport_control(SIGNAL_IOC1 | SIGNAL_IOC2 | SIGNAL_RW,
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(cmd & 0x100 ? SIGNAL_IOC1 : 0) | (cmd & 0x200 ? SIGNAL_IOC2 : 0));
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/* Control data setup time */
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ndelay(200);
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ndelay(T_SU);
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/* send command */
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/* EX signal pulse width = 500ns */
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/* Fixme: why 500 ns? Datasheet says 200ns */
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drv_generic_parport_toggle(SIGNAL_EX, 1, 500);
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/* wait */
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udelay(delay);
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drv_generic_parport_toggle(SIGNAL_EX, 1, T_W);
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if (UseBusy) {
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/* honour data hold time */
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ndelay (T_H);
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} else {
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/* wait for command completion */
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udelay(delay);
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}
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}
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static void drv_M5_clear(void)
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{
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drv_M5_command(0x0001, 1250); /* clear display */
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drv_M5_command(0x0001, T_CLEAR); /* clear display */
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}
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@@ -220,11 +324,11 @@ static void drv_M5_write(const int row, const int col, const char *data, const i
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pos = (row - 4) * (DDRAM >> DUTY) + (DDRAM >> DUTY) / 2 + col;
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}
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drv_M5_command(0x300 | pos, 20);
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drv_M5_command(0x300 | pos, T_EXEC);
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while (l--) {
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cmd = *(unsigned char *) data++;
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drv_M5_command(0x200 | cmd, 20);
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drv_M5_command(0x200 | cmd, T_EXEC);
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}
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}
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@@ -233,10 +337,10 @@ static void drv_M5_defchar(const int ascii, const unsigned char *matrix)
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{
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int i;
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drv_M5_command(0x300 + DDRAM + 8 * (ascii - CHAR0), 20);
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drv_M5_command(0x300 + DDRAM + 8 * (ascii - CHAR0), T_EXEC);
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for (i = 0; i < YRES; i++) {
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drv_M5_command(0x200 | (matrix[i] & 0x3f), 20);
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drv_M5_command(0x200 | (matrix[i] & 0x3f), T_EXEC);
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}
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}
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@@ -259,11 +363,11 @@ static int drv_M5_GPO(const int num, const int val)
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drv_generic_parport_data(GPO);
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/* 74HCT573 set-up time */
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ndelay(20);
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ndelay(T_GPO_ST);
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/* send data */
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/* 74HCT573 enable pulse width = 24ns */
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drv_generic_parport_toggle(SIGNAL_GPO, 1, 24);
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/* 74HCT573 enable pulse width */
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drv_generic_parport_toggle(SIGNAL_GPO, 1, T_GPO_PW);
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return v;
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}
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@@ -370,6 +474,8 @@ static int drv_M5_start(const char *section, const int quiet)
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return -1;
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}
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if ((SIGNAL_RW = drv_generic_parport_wire_ctrl("RW", "GND")) == 0xff)
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return -1;
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if ((SIGNAL_EX = drv_generic_parport_wire_ctrl("EX", "STROBE")) == 0xff)
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return -1;
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if ((SIGNAL_IOC1 = drv_generic_parport_wire_ctrl("IOC1", "SLCTIN")) == 0xff)
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@@ -379,11 +485,52 @@ static int drv_M5_start(const char *section, const int quiet)
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if ((SIGNAL_GPO = drv_generic_parport_wire_ctrl("GPO", "GND")) == 0xff)
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return -1;
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/* Timings */
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/* low level communication timings [nanoseconds]
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* we use the worst-case default values, but allow
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* modification from the config file.
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*/
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T_SU = timing(Name, section, "SU", 200, "ns"); /* control data setup time */
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T_W = timing(Name, section, "W", 500, "ns"); /* EX signal pulse width */
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T_D = timing(Name, section, "D", 300, "ns"); /* Data output delay time */
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T_H = timing(Name, section, "H", 100, "ns"); /* Data hold time */
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/* GPO timing */
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if (SIGNAL_GPO != 0) {
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T_GPO_ST = timing(Name, section, "GPO_ST", 20, "ns"); /* 74HCT573 set-up time */
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T_GPO_PW = timing(Name, section, "GPO_PW", 230, "ns"); /* 74HCT573 enable pulse width */
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} else {
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T_GPO_ST = 0;
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T_GPO_PW = 0;
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}
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/* M50530 execution timings [microseconds]
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* we use the worst-case default values, but allow
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* modification from the config file.
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*/
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T_EXEC = timing(Name, section, "EXEC", 20, "us"); /* normal execution time */
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T_CLEAR = timing(Name, section, "CLEAR", 1250, "us"); /* 'clear display' execution time */
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T_INIT = timing(Name, section, "INIT", 2000, "us"); /* mysterious initialization time */
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/* maybe use busy-flag from now on */
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cfg_number(section, "UseBusy", 0, 0, 1, &UseBusy);
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/* make sure we don't use the busy flag with RW wired to GND */
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if (UseBusy && !SIGNAL_RW) {
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error("%s: busy-flag checking is impossible with RW wired to GND!", Name);
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UseBusy = 0;
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}
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info("%s: %susing busy-flag checking", Name, UseBusy ? "" : "not ");
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/* clear all signals */
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drv_generic_parport_control(SIGNAL_EX | SIGNAL_IOC1 | SIGNAL_IOC2 | SIGNAL_GPO, 0);
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drv_generic_parport_control(SIGNAL_RW | SIGNAL_EX | SIGNAL_IOC1 | SIGNAL_IOC2 | SIGNAL_GPO, 0);
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/* for some mysterious reason, this delay is necessary... */
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udelay(2000);
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udelay(T_INIT);
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/* set direction: write */
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drv_generic_parport_direction(0);
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@@ -439,7 +586,7 @@ static int drv_M5_start(const char *section, const int quiet)
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debug("SET FUNCTION MODE 0x%02x", SF);
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drv_M5_command(SF, 20);
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drv_M5_command(SF, T_EXEC);
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/* set display (SD) mode:
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@@ -455,7 +602,7 @@ static int drv_M5_start(const char *section, const int quiet)
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/* SD: 0x20 = 00100000 */
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/* SD: turn off display */
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drv_M5_command(0x0020, 20);
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drv_M5_command(0x0020, T_EXEC);
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/* set entry (SE) mode:
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@@ -472,12 +619,12 @@ static int drv_M5_start(const char *section, const int quiet)
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/* SE: 0x50 = 01010000 */
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/* SE: increment display start after Write */
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drv_M5_command(0x0050, 20);
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drv_M5_command(0x0050, T_EXEC);
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/* SD: 0x30 = 00110000 */
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/* SD: turn on display */
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drv_M5_command(0x0030, 20);
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drv_M5_command(0x0030, T_EXEC);
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drv_M5_clear();
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@@ -535,7 +682,7 @@ int drv_M5_init(const char *section, const int quiet)
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WIDGET_CLASS wc;
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int ret;
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info("%s: %s", Name, "$Revision: 1.21 $");
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info("%s: %s", Name, "$Revision: 1.22 $");
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/* display preferences */
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XRES = -1; /* pixel width of one char */
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@@ -613,7 +760,7 @@ int drv_M5_quit(const int quiet)
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}
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/* clear all signals */
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drv_generic_parport_control(SIGNAL_EX | SIGNAL_IOC1 | SIGNAL_IOC2 | SIGNAL_GPO, 0);
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drv_generic_parport_control(SIGNAL_RW | SIGNAL_EX | SIGNAL_IOC1 | SIGNAL_IOC2 | SIGNAL_GPO, 0);
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/* close port */
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drv_generic_parport_close();
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@@ -313,10 +313,12 @@ Display M50530-24x8 {
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Size '24x8'
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Font '5x7'
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Duty 2
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Wire.RW 'INIT'
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Wire.EX 'STROBE'
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Wire.IOC1 'SLCTIN'
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Wire.IOC2 'AUTOFD'
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Wire.GPO 'INIT'
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Wire.GPO 'GND'
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UseBusy 1
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}
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