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Update README and improved TDO sync performance #2

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Update README and improved TDO sync performance #2

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f302d45
improved delay wait time function
SchemingWeasels May 27, 2020
7460a84
fix wrong pin def
SchemingWeasels May 27, 2020
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18 changes: 10 additions & 8 deletions README.md
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Expand Up @@ -8,21 +8,23 @@ I have tested and successfully programmed the following CPLDs:
- Xilinx XC2C64A
- Xilinx XC9572XL
- Altera MAX II EPM240T100C5 (I used dangerous prototypes svf2xsvf converter to convert Altera's svf file to the compressed xsvf file, although that program doesn't claim to support this device)
- Xilinx XC6SLX16

INSTRUCTIONS
============

1. Know your Arduino: http://wiki.stm32duino.com/index.php?title=Blue_Pill
2. Download the project contents somewhere on your computer.
3. If you don't have it, install Roger Clark's support for Arduino available from https://github.com/rogerclarkmelbourne/Arduino_STM32
4. Open the xsvduino.ino on the Arduino IDE
5. On the tools menu, use the following settings:
Board: "Generic STM32F103CB series"
6. On the same menu, choose your upload method. I find the ST-Link method to be the easiest, but look there for other options or check out this link: https://medium.com/@paramaggarwal/converting-an-stm32f103-board-to-a-black-magic-probe-c013cf2cc38c
7. Unplug the ST-Link programmer if you are using one, and then plug the Blue Pill to your computer with a USB cable. An LED
4. Flash the STM32duino bootloader to enable USB Serial
5. Open the xsvduino.ino on the Arduino IDE
6. On the tools menu, use the following settings:
Board: "Generic STM32F103C series" | Optimize : "Smallest" | Varient : 64k Flash | CPU Speed : "72MHz)
7. On the same menu, choose your upload method. I find the ST-Link method to be the easiest, but look there for other options or check out this link: https://medium.com/@paramaggarwal/converting-an-stm32f103-board-to-a-black-magic-probe-c013cf2cc38c
8. Unplug the ST-Link programmer if you are using one, and then plug the Blue Pill to your computer with a USB cable. An LED
starts blinking on the Blue Pill it should be seen by the OS as a new serial device. On OSX this is something like /dev/tty.usbmodem1411, and on Linux something like /dev/ttyACM0. I'm not sure how this works on Windows, but I guess a new COM port should present itself to you (hopefully).
8. Find the send_xsvf tool on the tools folder. This a Python script to upload a file to the xsvfduino.
9. Upload your XSVF file using a command like this:
9. Find the send_xsvf tool on the tools folder. This a Python script to upload a file to the xsvfduino.
10. Upload your XSVF file using a command like this:
`./send_xsvf -p /dev/tty.your_arduino_serial_port somefile.xsvf`

JTAG INTERFACE PINOUT
Expand All @@ -33,7 +35,7 @@ This is defined in ports.h:
- **TCK** -- PB6 (output)
- **TMS** -- PB7 (output)
- **TDI** -- PB8 (output)
- **TDO** -- PB9 (input with internal pullup)
- **TDO** -- PB5 (input with internal pullup)

WARNING
=======
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6 changes: 3 additions & 3 deletions ports.cpp
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Expand Up @@ -110,8 +110,8 @@ void readByte(uint8_t *data)
/* requirement is also satisfied. */
void waitTime(uint32_t microsec)
{
#if 0
static long tckCyclesPerMicrosec = 72/10; /* must be at least 1 */
#if 1
static long tckCyclesPerMicrosec = 1; /* must be at least 1 */
long tckCycles = microsec * tckCyclesPerMicrosec;
long i;

Expand All @@ -126,7 +126,7 @@ void waitTime(uint32_t microsec)
}
#endif

#if 1
#if 0
uint32_t t0 = micros();
while( micros()-t0 < microsec )
{
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