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Slow AVRISP-MKII clone PDI/TPI programming speed back to 250KHz due to issues with the XPLAINBridge when PDI programming at faster rates. 

Speed up XMEGANVM_WaitWhileNVMControllerBusy() by preloading the status register address into the pointer register of the target's NVM controller and then reading via a faster indirect load command.
This commit is contained in:
Dean Camera 2010-11-16 12:30:00 +00:00
parent 002cd6df49
commit a9f313afa9
4 changed files with 10 additions and 9 deletions
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1
LUFA/ManPages/ChangeLog.txt
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@ -102,7 +102,6 @@
* - Fixed USBtoSerial and XPLAINBridge demos discarding data from the PC if the send buffer becomes full
* - Fixed broken input in the MagStripe reader project due to an incorrect HID report descriptor
* - Fixed incorrect PollingIntervalMS values in the demo/project/bootloader endpoint descriptors (thanks to MCS Electronics)
* - Fixed PDI/TPI programming speed of ~250KHz in the AVRISP-MKII Clone project, instead of the desired 500KHz (thanks to Tom Light)
*
* \section Sec_ChangeLog100807 Version 100807
* <b>New:</b>

10
Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c
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@ -96,13 +96,15 @@ bool XMEGANVM_WaitWhileNVMBusBusy(void)
*/
bool XMEGANVM_WaitWhileNVMControllerBusy(void)
{
/* Preload the pointer register with the NVM STATUS register address to check the BUSY flag */
XPROGTarget_SendByte(PDI_CMD_ST | (PDI_POINTER_DIRECT << 2) | PDI_DATSIZE_4BYTES);
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_STATUS);
/* Poll the NVM STATUS register while the NVM controller is busy */
for (;;)
{
/* Send a LDS command to read the NVM STATUS register to check the BUSY flag */
XPROGTarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_STATUS);
/* Fetch the current status value via the pointer register (without auto-increment afterwards) */
XPROGTarget_SendByte(PDI_CMD_LD | (PDI_POINTER_INDIRECT << 2) | PDI_DATSIZE_1BYTE);
uint8_t StatusRegister = XPROGTarget_ReceiveByte();
/* We might have timed out waiting for the status register read response, check here */

2
Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.h
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@ -56,7 +56,7 @@
#endif
/** Serial carrier TPI/PDI speed when hardware TPI/PDI mode is used. */
#define XPROG_HARDWARE_SPEED 500000
#define XPROG_HARDWARE_SPEED 250000
/** Total number of bits in a single USART frame. */
#define BITS_IN_USART_FRAME 12

6
Projects/AVRISP-MKII/makefile
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@ -60,13 +60,13 @@
# MCU name
MCU = at90usb1287
MCU = at90usb162
# Target board (see library "Board Types" documentation, NONE for projects not requiring
# LUFA board drivers). If USER is selected, put custom board drivers in a directory called
# "Board" inside the application directory.
BOARD = USBKEY
BOARD = USBTINYMKII
# Processor frequency.
@ -80,7 +80,7 @@ BOARD = USBKEY
# does not *change* the processor frequency - it should merely be updated to
# reflect the processor speed set externally so that the code can use accurate
# software delays.
F_CPU = 8000000
F_CPU = 16000000
# Input clock frequency.