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all cable: always display real used frequency

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This commit is contained in:
Gwenhael Goavec-Merou
2021-02-05 06:28:19 +01:00
parent 3d29fb79fe
commit 5c49b1465a
6 changed files with 76 additions and 38 deletions
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src/ftdipp_mpsse.cpp
+28 -18
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@@ -11,6 +11,7 @@
#endif
#include <libusb.h>
#include "display.hpp"
#include "ftdipp_mpsse.hpp"
using namespace std;
@@ -222,31 +223,40 @@ int FTDIpp_MPSSE::setClkFreq(uint32_t clkHZ, char use_divide_by_5)
use_divide_by_5 = false;
}
if ((use_divide_by_5 && _clkHZ > 6000000) || _clkHZ > 30000000) {
fprintf(stderr, "Error: too fast frequency\n");
return -1;
}
if (use_divide_by_5) {
if (_clkHZ > 6000000) {
printWarn("Jtag probe limited to 60MHz");
_clkHZ = 6000000;
}
} else {
if (_clkHZ > 30000000) {
printWarn("Jtag probe limited to 30MHz");
_clkHZ = 3000000;
}
}
presc = (base_freq /(_clkHZ * 2)) -1;
real_freq = base_freq / ((1+presc)*2);
if (real_freq > clkHZ)
presc = (base_freq /(_clkHZ * 2)) -1;
real_freq = base_freq / ((1+presc)*2);
if (real_freq > _clkHZ)
presc ++;
real_freq = base_freq / ((1+presc)*2);
display("presc : %d input freq : %d requested freq : %d real freq : %d\n",
real_freq = base_freq / ((1+presc)*2);
printInfo("Jtag frequency : requested " + std::to_string(clkHZ) +
"Hz -> real " + std::to_string(real_freq) + "Hz");
display("presc : %d input freq : %d requested freq : %d real freq : %d\n",
presc, base_freq, _clkHZ, real_freq);
buffer[1] = presc & 0xff;
buffer[2] = (presc >> 8) & 0xff;
buffer[1] = presc & 0xff;
buffer[2] = (presc >> 8) & 0xff;
mpsse_store(buffer, 3);
ret = mpsse_write();
if (ret < 0) {
fprintf(stderr, "Error: write for frequency return %d\n", ret);
return -1;
}
if (ret < 0) {
fprintf(stderr, "Error: write for frequency return %d\n", ret);
return -1;
}
ret = ftdi_read_data(_ftdi, buffer, 4);
ftdi_usb_purge_buffers(_ftdi);
return real_freq;
return real_freq;
}
int FTDIpp_MPSSE::mpsse_store(unsigned char c)
@@ -622,11 +632,11 @@ bool FTDIpp_MPSSE::search_with_dev(const string &device)
/* Get closest usb device parent (we need VIP/PID) */
usbdeviceparent =
udev_device_get_parent_with_subsystem_devtype(dev, "usb",
udev_device_get_parent_with_subsystem_devtype(dev, "usb",
"usb_device");
if (!usbdeviceparent) {
printf
("Unable to find parent usb device! Is this actually an USB device ?\n");
("Unable to find parent usb device! Is this actually an USB device ?\n");
udev_device_unref(dev);
udev_unref(udev);
return false;