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tinyriscv-openocd
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zy1000: use correct base clock when calculating speed divisor 

revc uses 60MHz and revb 64MHz, use this in calculations.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
__archive__
Øyvind Harboe 2010-08-02 22:12:33 +02:00
parent 4e27305ed5
commit c49d4c9f7f
1 changed files with 11 additions and 4 deletions
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15
src/jtag/zy1000/zy1000.c
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@ -1,4 +1,4 @@
'n/***************************************************************************
/***************************************************************************
* Copyright (C) 2007-2010 by Øyvind Harboe *
* *
* This program is free software; you can redistribute it and/or modify *
@ -62,6 +62,9 @@
#ifdef CYGPKG_HAL_NIOS2
#include <cyg/hal/io.h>
#include <cyg/firmwareutil/firmwareutil.h>
#define ZYLIN_KHZ 60000
#else
#define ZYLIN_KHZ 64000
#endif
#define ZYLIN_VERSION GIT_ZY1000_VERSION
@ -70,6 +73,9 @@
#define ZYLIN_OPENOCD GIT_OPENOCD_VERSION
#define ZYLIN_OPENOCD_VERSION "ZY1000 " ZYLIN_VERSION " " ZYLIN_DATE
#else
/* Assume we're connecting to a revc w/60MHz clock. */
#define ZYLIN_KHZ 60000
#endif
@ -102,7 +108,7 @@ static int zy1000_khz(int khz, int *jtag_speed)
* 64000 / 6 = 10666
*
*/
speed = (64000 + (khz -1)) / khz;
speed = (ZYLIN_KHZ + (khz -1)) / khz;
speed = (speed + 1 ) / 2;
speed *= 2;
if (speed > 8190)
@ -123,7 +129,7 @@ static int zy1000_speed_div(int speed, int *khz)
}
else
{
*khz = 64000/speed;
*khz = ZYLIN_KHZ / speed;
}
return ERROR_OK;
@ -265,7 +271,8 @@ int zy1000_speed(int speed)
{
if (speed > 8190 || speed < 2)
{
LOG_USER("valid ZY1000 jtag_speed=[8190,2]. Divisor is 64MHz / even values between 8190-2, i.e. min 7814Hz, max 32MHz");
LOG_USER("valid ZY1000 jtag_speed=[8190,2]. With divisor is %dkHz / even values between 8190-2, i.e. min %dHz, max %dMHz",
ZYLIN_KHZ, (ZYLIN_KHZ * 1000) / 8190, ZYLIN_KHZ / (2 * 1000));
return ERROR_INVALID_ARGUMENTS;
}