From 845d5f77d58c6547e28f3fd29ffa830f93e08f26 Mon Sep 17 00:00:00 2001
From: Tomek CEDRO <cederom@tlen.pl>
Date: Wed, 2 Nov 2011 03:48:31 +0000
Subject: transport/swd_drv: Fixed critical issue with bitswapping of
 transmitted data. ACK and DATA packets are always transmitted LSb-First, no
 matter how ARM draws its fuckin timing diagrams!

---
 src/transport/swd_libswd_drv_openocd.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/transport/swd_libswd_drv_openocd.c b/src/transport/swd_libswd_drv_openocd.c
index acc8830c..49a1f946 100644
--- a/src/transport/swd_libswd_drv_openocd.c
+++ b/src/transport/swd_libswd_drv_openocd.c
@@ -62,7 +62,7 @@ int swd_drv_mosi_8(swd_ctx_t *swdctx, swd_cmd_t *cmd, char *data, int bits, int
  static char misodata[8], mosidata[8];
 
  /* Split output data into char array. */
- for (i=0;i<8;i++) mosidata[(nLSBfirst==SWD_DIR_LSBFIRST)?(i):(7-i)]=((1<<i)&(*data))?1:0; 
+ for (i=0;i<8;i++) mosidata[(nLSBfirst==SWD_DIR_LSBFIRST)?(i):(bits-1-i)]=((1<<i)&(*data))?1:0; 
  /* Then send that array into interface hardware. */
  res=jtag_interface->transfer(NULL, bits, mosidata, misodata, 0);
  if (res<0) return SWD_ERROR_DRIVER;
@@ -91,7 +91,7 @@ int swd_drv_mosi_32(swd_ctx_t *swdctx, swd_cmd_t *cmd, int *data, int bits, int
  static char misodata[32], mosidata[32];
 
  //UrJTAG drivers shift data LSB-First.
- for (i=0;i<32;i++) mosidata[(nLSBfirst==SWD_DIR_LSBFIRST)?(i):(31-i)]=((1<<i)&(*data))?1:0; 
+ for (i=0;i<32;i++) mosidata[(nLSBfirst==SWD_DIR_LSBFIRST)?(i):(bits-1-i)]=((1<<i)&(*data))?1:0; 
  res=jtag_interface->transfer(NULL, bits, mosidata, misodata, 0);
  if (res<0) return SWD_ERROR_DRIVER;
  return i;
@@ -116,12 +116,11 @@ int swd_drv_miso_8(swd_ctx_t *swdctx, swd_cmd_t *cmd, char *data, int bits, int
  static signed int res;
  static char misodata[8], mosidata[8];
 
- // This function sends and reveice MSb-first.
- res=jtag_interface->transfer(NULL, bits, mosidata, misodata, 0);
+ res=jtag_interface->transfer(NULL, bits, mosidata, misodata, SWD_DIR_LSBFIRST);
  if (res<0) return SWD_ERROR_DRIVER;
  /* Now we need to reconstruct the data byte from shifted in LSBfirst byte array. */
  *data=0;
- for (i=0;i<bits;i++) *data|=(misodata[(nLSBfirst==SWD_DIR_LSBFIRST)?(bits-1-i):(i)]?(1<<i):0);
+ for (i=0;i<bits;i++) *data|=misodata[(nLSBfirst==SWD_DIR_LSBFIRST)?(i):(bits-1-i)]?(1<<i):0;
  LOG_DEBUG("OpenOCD's swd_drv_miso_8(swdctx=@%p, cmd=@%p, data=@%p, bits=%d, nLSBfirst=0x%02X) reads: 0x%02X", (void*)swdctx, (void*)cmd, (void*)data, bits, nLSBfirst, *data);
  return i;
 }
@@ -145,11 +144,11 @@ int swd_drv_miso_32(swd_ctx_t *swdctx, swd_cmd_t *cmd, int *data, int bits, int
  static signed int res;
  static char misodata[32], mosidata[32];
 
- res=jtag_interface->transfer(NULL, bits, mosidata, misodata, 0);
+ res=jtag_interface->transfer(NULL, bits, mosidata, misodata, SWD_DIR_LSBFIRST);
  if (res<0) return SWD_ERROR_DRIVER;
  /* Now we need to reconstruct the data byte from shifted in LSBfirst byte array. */
  *data=0;
- for (i=0;i<bits;i++) *data|=(misodata[(nLSBfirst==SWD_DIR_LSBFIRST)?(bits-1-i):(i)]?(1<<i):0);
+ for (i=0;i<bits;i++) *data|=(misodata[(nLSBfirst==SWD_DIR_LSBFIRST)?(i):(bits-1-i)]?(1<<i):0);
  LOG_DEBUG("OpenOCD's swd_drv_miso_32(swdctx=@%p, cmd=@%p, data=@%p, bits=%d, nLSBfirst=0x%02X) reads: 0x%08X", (void*)swdctx, (void*)cmd, (void*)data, bits, nLSBfirst, *data);
  LOG_DEBUG("OpenOCD's swd_drv_miso_32() reads: 0x%08X\n", *data);
  return i;
-- 
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