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JTAG_DP.cpp
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JTAG_DP.cpp
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/* CMSIS-DAP Interface Firmware
* Copyright (c) 2009-2013 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "DAP_config.h"
#include "DAP.h"
// JTAG Macros
#define PIN_TCK_SET PIN_SWCLK_TCK_SET
#define PIN_TCK_CLR PIN_SWCLK_TCK_CLR
#define PIN_TMS_SET PIN_SWDIO_TMS_SET
#define PIN_TMS_CLR PIN_SWDIO_TMS_CLR
#define JTAG_CYCLE_TCK() \
PIN_TCK_CLR(); \
PIN_DELAY(); \
PIN_TCK_SET(); \
PIN_DELAY()
#define JTAG_CYCLE_TDI(tdi) \
PIN_TDI_OUT(tdi); \
PIN_TCK_CLR(); \
PIN_DELAY(); \
PIN_TCK_SET(); \
PIN_DELAY()
#define JTAG_CYCLE_TDO(tdo) \
PIN_TCK_CLR(); \
PIN_DELAY(); \
tdo = PIN_TDO_IN(); \
PIN_TCK_SET(); \
PIN_DELAY()
#define JTAG_CYCLE_TDIO(tdi,tdo) \
PIN_TDI_OUT(tdi); \
PIN_TCK_CLR(); \
PIN_DELAY(); \
tdo = PIN_TDO_IN(); \
PIN_TCK_SET(); \
PIN_DELAY()
#define PIN_DELAY() PIN_DELAY_SLOW(DAP_Data.clock_delay)
#if (DAP_JTAG != 0)
// Generate JTAG Sequence
// info: sequence information
// tdi: pointer to TDI generated data
// tdo: pointer to TDO captured data
// return: none
void JTAG_Sequence (uint32_t info, uint8_t *tdi, uint8_t *tdo) {
uint32_t i_val;
uint32_t o_val;
uint32_t bit;
uint32_t n, k;
n = info & JTAG_SEQUENCE_TCK;
if (n == 0) n = 64;
if (info & JTAG_SEQUENCE_TMS) {
PIN_TMS_SET();
} else {
PIN_TMS_CLR();
}
while (n) {
i_val = *tdi++;
o_val = 0;
for (k = 8; k && n; k--, n--) {
JTAG_CYCLE_TDIO(i_val, bit);
i_val >>= 1;
o_val >>= 1;
o_val |= bit << 7;
}
o_val >>= k;
if (info & JTAG_SEQUENCE_TDO) {
*tdo++ = o_val;
}
}
}
// JTAG Set IR
// ir: IR value
// return: none
#define JTAG_IR_Function(speed) /**/ \
void JTAG_IR_##speed (uint32_t ir) { \
uint32_t n; \
\
PIN_TMS_SET(); \
JTAG_CYCLE_TCK(); /* Select-DR-Scan */ \
JTAG_CYCLE_TCK(); /* Select-IR-Scan */ \
PIN_TMS_CLR(); \
JTAG_CYCLE_TCK(); /* Capture-IR */ \
JTAG_CYCLE_TCK(); /* Shift-IR */ \
\
PIN_TDI_OUT(1); \
for (n = DAP_Data.jtag_dev.ir_before[DAP_Data.jtag_dev.index]; n; n--) { \
JTAG_CYCLE_TCK(); /* Bypass before data */ \
} \
for (n = DAP_Data.jtag_dev.ir_length[DAP_Data.jtag_dev.index] - 1; n; n--) { \
JTAG_CYCLE_TDI(ir); /* Set IR bits (except last) */ \
ir >>= 1; \
} \
n = DAP_Data.jtag_dev.ir_after[DAP_Data.jtag_dev.index]; \
if (n) { \
JTAG_CYCLE_TDI(ir); /* Set last IR bit */ \
PIN_TDI_OUT(1); \
for (--n; n; n--) { \
JTAG_CYCLE_TCK(); /* Bypass after data */ \
} \
PIN_TMS_SET(); \
JTAG_CYCLE_TCK(); /* Bypass & Exit1-IR */ \
} else { \
PIN_TMS_SET(); \
JTAG_CYCLE_TDI(ir); /* Set last IR bit & Exit1-IR */ \
} \
\
JTAG_CYCLE_TCK(); /* Update-IR */ \
PIN_TMS_CLR(); \
JTAG_CYCLE_TCK(); /* Idle */ \
PIN_TDI_OUT(1); \
}
// JTAG Transfer I/O
// request: A[3:2] RnW APnDP
// data: DATA[31:0]
// return: ACK[2:0]
#define JTAG_TransferFunction(speed) /**/ \
uint8_t JTAG_Transfer##speed (uint32_t request, uint32_t *data) { \
uint32_t ack; \
uint32_t bit; \
uint32_t val; \
uint32_t n; \
\
PIN_TMS_SET(); \
JTAG_CYCLE_TCK(); /* Select-DR-Scan */ \
PIN_TMS_CLR(); \
JTAG_CYCLE_TCK(); /* Capture-DR */ \
JTAG_CYCLE_TCK(); /* Shift-DR */ \
\
for (n = DAP_Data.jtag_dev.index; n; n--) { \
JTAG_CYCLE_TCK(); /* Bypass before data */ \
} \
\
JTAG_CYCLE_TDIO(request >> 1, bit); /* Set RnW, Get ACK.0 */ \
ack = bit << 1; \
JTAG_CYCLE_TDIO(request >> 2, bit); /* Set A2, Get ACK.1 */ \
ack |= bit << 0; \
JTAG_CYCLE_TDIO(request >> 3, bit); /* Set A3, Get ACK.2 */ \
ack |= bit << 2; \
\
if (ack != DAP_TRANSFER_OK) { \
/* Exit on error */ \
PIN_TMS_SET(); \
JTAG_CYCLE_TCK(); /* Exit1-DR */ \
goto exit; \
} \
\
if (request & DAP_TRANSFER_RnW) { \
/* Read Transfer */ \
val = 0; \
for (n = 31; n; n--) { \
JTAG_CYCLE_TDO(bit); /* Get D0..D30 */ \
val |= bit << 31; \
val >>= 1; \
} \
n = DAP_Data.jtag_dev.count - DAP_Data.jtag_dev.index - 1; \
if (n) { \
JTAG_CYCLE_TDO(bit); /* Get D31 */ \
for (--n; n; n--) { \
JTAG_CYCLE_TCK(); /* Bypass after data */ \
} \
PIN_TMS_SET(); \
JTAG_CYCLE_TCK(); /* Bypass & Exit1-DR */ \
} else { \
PIN_TMS_SET(); \
JTAG_CYCLE_TDO(bit); /* Get D31 & Exit1-DR */ \
} \
val |= bit << 31; \
if (data) *data = val; \
} else { \
/* Write Transfer */ \
val = *data; \
for (n = 31; n; n--) { \
JTAG_CYCLE_TDI(val); /* Set D0..D30 */ \
val >>= 1; \
} \
n = DAP_Data.jtag_dev.count - DAP_Data.jtag_dev.index - 1; \
if (n) { \
JTAG_CYCLE_TDI(val); /* Set D31 */ \
for (--n; n; n--) { \
JTAG_CYCLE_TCK(); /* Bypass after data */ \
} \
PIN_TMS_SET(); \
JTAG_CYCLE_TCK(); /* Bypass & Exit1-DR */ \
} else { \
PIN_TMS_SET(); \
JTAG_CYCLE_TDI(val); /* Set D31 & Exit1-DR */ \
} \
} \
\
exit: \
JTAG_CYCLE_TCK(); /* Update-DR */ \
PIN_TMS_CLR(); \
JTAG_CYCLE_TCK(); /* Idle */ \
PIN_TDI_OUT(1); \
\
/* Idle cycles */ \
n = DAP_Data.transfer.idle_cycles; \
while (n--) { \
JTAG_CYCLE_TCK(); /* Idle */ \
} \
\
return (ack); \
}
#undef PIN_DELAY
#define PIN_DELAY() PIN_DELAY_FAST()
JTAG_IR_Function(Fast);
JTAG_TransferFunction(Fast);
#undef PIN_DELAY
#define PIN_DELAY() PIN_DELAY_SLOW(DAP_Data.clock_delay)
JTAG_IR_Function(Slow);
JTAG_TransferFunction(Slow);
// JTAG Read IDCODE register
// return: value read
uint32_t JTAG_ReadIDCode (void) {
uint32_t bit;
uint32_t val;
uint32_t n;
PIN_TMS_SET();
JTAG_CYCLE_TCK(); /* Select-DR-Scan */
PIN_TMS_CLR();
JTAG_CYCLE_TCK(); /* Capture-DR */
JTAG_CYCLE_TCK(); /* Shift-DR */
for (n = DAP_Data.jtag_dev.index; n; n--) {
JTAG_CYCLE_TCK(); /* Bypass before data */
}
val = 0;
for (n = 31; n; n--) {
JTAG_CYCLE_TDO(bit); /* Get D0..D30 */
val |= bit << 31;
val >>= 1;
}
PIN_TMS_SET();
JTAG_CYCLE_TDO(bit); /* Get D31 & Exit1-DR */
val |= bit << 31;
JTAG_CYCLE_TCK(); /* Update-DR */
PIN_TMS_CLR();
JTAG_CYCLE_TCK(); /* Idle */
return (val);
}
// JTAG Write ABORT register
// data: value to write
// return: none
void JTAG_WriteAbort (uint32_t data) {
uint32_t n;
PIN_TMS_SET();
JTAG_CYCLE_TCK(); /* Select-DR-Scan */
PIN_TMS_CLR();
JTAG_CYCLE_TCK(); /* Capture-DR */
JTAG_CYCLE_TCK(); /* Shift-DR */
for (n = DAP_Data.jtag_dev.index; n; n--) {
JTAG_CYCLE_TCK(); /* Bypass before data */
}
PIN_TDI_OUT(0);
JTAG_CYCLE_TCK(); /* Set RnW=0 (Write) */
JTAG_CYCLE_TCK(); /* Set A2=0 */
JTAG_CYCLE_TCK(); /* Set A3=0 */
for (n = 31; n; n--) {
JTAG_CYCLE_TDI(data); /* Set D0..D30 */
data >>= 1;
}
n = DAP_Data.jtag_dev.count - DAP_Data.jtag_dev.index - 1;
if (n) {
JTAG_CYCLE_TDI(data); /* Set D31 */
for (--n; n; n--) {
JTAG_CYCLE_TCK(); /* Bypass after data */
}
PIN_TMS_SET();
JTAG_CYCLE_TCK(); /* Bypass & Exit1-DR */
} else {
PIN_TMS_SET();
JTAG_CYCLE_TDI(data); /* Set D31 & Exit1-DR */
}
JTAG_CYCLE_TCK(); /* Update-DR */
PIN_TMS_CLR();
JTAG_CYCLE_TCK(); /* Idle */
PIN_TDI_OUT(1);
}
// JTAG Set IR
// ir: IR value
// return: none
void JTAG_IR (uint32_t ir) {
if (DAP_Data.fast_clock) {
JTAG_IR_Fast(ir);
} else {
JTAG_IR_Slow(ir);
}
}
// JTAG Transfer I/O
// request: A[3:2] RnW APnDP
// data: DATA[31:0]
// return: ACK[2:0]
uint8_t JTAG_Transfer(uint32_t request, uint32_t *data) {
if (DAP_Data.fast_clock) {
return JTAG_TransferFast(request, data);
} else {
return JTAG_TransferSlow(request, data);
}
}
#endif /* (DAP_JTAG != 0) */