From c6d6bdae0a6fa5604174428787ff3c415ca73fad Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Wed, 12 Oct 2011 05:31:35 +0000 Subject: Added reliability patches to the AVRISP-MKII Clone project's PDI/TPI protocols (thanks to Justin Mattair). --- Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) (limited to 'Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c') diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c b/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c index e4f1186b0..71fa78222 100644 --- a/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c +++ b/Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c @@ -149,13 +149,18 @@ void XMEGANVM_DisablePDI(void) { XMEGANVM_WaitWhileNVMBusBusy(); - /* Clear the RESET key in the RESET PDI register to allow the XMEGA to run */ - XPROGTarget_SendByte(PDI_CMD_STCS | PDI_RESET_REG); - XPROGTarget_SendByte(0x00); - - /* Do it twice to make sure it takes effect (silicon bug?) */ - XPROGTarget_SendByte(PDI_CMD_STCS | PDI_RESET_REG); - XPROGTarget_SendByte(0x00); + /* Clear the RESET key in the RESET PDI register to allow the XMEGA to run - must perform this until the + * change takes effect, as in some cases it takes multiple writes (silicon bug?). + */ + do + { + /* Clear reset register */ + XPROGTarget_SendByte(PDI_CMD_STCS | PDI_RESET_REG); + XPROGTarget_SendByte(0x00); + + /* Read back the reset register, check to see if it took effect */ + XPROGTarget_SendByte(PDI_CMD_LDCS | PDI_RESET_REG); + } while (XPROGTarget_ReceiveByte() != 0x00); XPROGTarget_DisableTargetPDI(); } -- cgit v1.2.3