* this function checks the current stable state to decide on the value of TMS
* to use.
*/
-static void bitbang_stableclocks(int num_cycles);
+static int bitbang_stableclocks(int num_cycles);
static void bitbang_swd_write_reg(uint8_t cmd, uint32_t value, uint32_t ap_delay_clk);
/* The bitbang driver leaves the TCK 0 when in idle */
static void bitbang_end_state(tap_state_t state)
{
- if (tap_is_state_stable(state))
- tap_set_end_state(state);
- else {
- LOG_ERROR("BUG: %i is not a valid end state", state);
- exit(-1);
- }
+ assert(tap_is_state_stable(state));
+ tap_set_end_state(state);
}
-static void bitbang_state_move(int skip)
+static int bitbang_state_move(int skip)
{
int i = 0, tms = 0;
uint8_t tms_scan = tap_get_tms_path(tap_get_state(), tap_get_end_state());
for (i = skip; i < tms_count; i++) {
tms = (tms_scan >> i) & 1;
- bitbang_interface->write(0, tms, 0);
- bitbang_interface->write(1, tms, 0);
+ if (bitbang_interface->write(0, tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
+ if (bitbang_interface->write(1, tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
}
- bitbang_interface->write(CLOCK_IDLE(), tms, 0);
+ if (bitbang_interface->write(CLOCK_IDLE(), tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
tap_set_state(tap_get_end_state());
+ return ERROR_OK;
}
/**
int tms = 0;
for (unsigned i = 0; i < num_bits; i++) {
tms = ((bits[i/8] >> (i % 8)) & 1);
- bitbang_interface->write(0, tms, 0);
- bitbang_interface->write(1, tms, 0);
+ if (bitbang_interface->write(0, tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
+ if (bitbang_interface->write(1, tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
}
- bitbang_interface->write(CLOCK_IDLE(), tms, 0);
+ if (bitbang_interface->write(CLOCK_IDLE(), tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
return ERROR_OK;
}
-static void bitbang_path_move(struct pathmove_command *cmd)
+static int bitbang_path_move(struct pathmove_command *cmd)
{
int num_states = cmd->num_states;
int state_count;
exit(-1);
}
- bitbang_interface->write(0, tms, 0);
- bitbang_interface->write(1, tms, 0);
+ if (bitbang_interface->write(0, tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
+ if (bitbang_interface->write(1, tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
tap_set_state(cmd->path[state_count]);
state_count++;
num_states--;
}
- bitbang_interface->write(CLOCK_IDLE(), tms, 0);
+ if (bitbang_interface->write(CLOCK_IDLE(), tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
tap_set_end_state(tap_get_state());
+ return ERROR_OK;
}
-static void bitbang_runtest(int num_cycles)
+static int bitbang_runtest(int num_cycles)
{
int i;
/* only do a state_move when we're not already in IDLE */
if (tap_get_state() != TAP_IDLE) {
bitbang_end_state(TAP_IDLE);
- bitbang_state_move(0);
+ if (bitbang_state_move(0) != ERROR_OK)
+ return ERROR_FAIL;
}
/* execute num_cycles */
for (i = 0; i < num_cycles; i++) {
- bitbang_interface->write(0, 0, 0);
- bitbang_interface->write(1, 0, 0);
+ if (bitbang_interface->write(0, 0, 0) != ERROR_OK)
+ return ERROR_FAIL;
+ if (bitbang_interface->write(1, 0, 0) != ERROR_OK)
+ return ERROR_FAIL;
}
- bitbang_interface->write(CLOCK_IDLE(), 0, 0);
+ if (bitbang_interface->write(CLOCK_IDLE(), 0, 0) != ERROR_OK)
+ return ERROR_FAIL;
/* finish in end_state */
bitbang_end_state(saved_end_state);
if (tap_get_state() != tap_get_end_state())
- bitbang_state_move(0);
+ if (bitbang_state_move(0) != ERROR_OK)
+ return ERROR_FAIL;
+
+ return ERROR_OK;
}
-static void bitbang_stableclocks(int num_cycles)
+static int bitbang_stableclocks(int num_cycles)
{
int tms = (tap_get_state() == TAP_RESET ? 1 : 0);
int i;
/* send num_cycles clocks onto the cable */
for (i = 0; i < num_cycles; i++) {
- bitbang_interface->write(1, tms, 0);
- bitbang_interface->write(0, tms, 0);
+ if (bitbang_interface->write(1, tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
+ if (bitbang_interface->write(0, tms, 0) != ERROR_OK)
+ return ERROR_FAIL;
}
+
+ return ERROR_OK;
}
-static void bitbang_scan(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size)
+static int bitbang_scan(bool ir_scan, enum scan_type type, uint8_t *buffer,
+ unsigned scan_size)
{
tap_state_t saved_end_state = tap_get_end_state();
- int bit_cnt;
+ unsigned bit_cnt;
if (!((!ir_scan &&
(tap_get_state() == TAP_DRSHIFT)) ||
else
bitbang_end_state(TAP_DRSHIFT);
- bitbang_state_move(0);
+ if (bitbang_state_move(0) != ERROR_OK)
+ return ERROR_FAIL;
bitbang_end_state(saved_end_state);
}
+ size_t buffered = 0;
for (bit_cnt = 0; bit_cnt < scan_size; bit_cnt++) {
- int val = 0;
int tms = (bit_cnt == scan_size-1) ? 1 : 0;
int tdi;
int bytec = bit_cnt/8;
if ((type != SCAN_IN) && (buffer[bytec] & bcval))
tdi = 1;
- bitbang_interface->write(0, tms, tdi);
-
- if (type != SCAN_OUT)
- val = bitbang_interface->read();
-
- bitbang_interface->write(1, tms, tdi);
+ if (bitbang_interface->write(0, tms, tdi) != ERROR_OK)
+ return ERROR_FAIL;
if (type != SCAN_OUT) {
- if (val)
- buffer[bytec] |= bcval;
- else
- buffer[bytec] &= ~bcval;
+ if (bitbang_interface->buf_size) {
+ if (bitbang_interface->sample() != ERROR_OK)
+ return ERROR_FAIL;
+ buffered++;
+ } else {
+ switch (bitbang_interface->read()) {
+ case BB_LOW:
+ buffer[bytec] &= ~bcval;
+ break;
+ case BB_HIGH:
+ buffer[bytec] |= bcval;
+ break;
+ default:
+ return ERROR_FAIL;
+ }
+ }
+ }
+
+ if (bitbang_interface->write(1, tms, tdi) != ERROR_OK)
+ return ERROR_FAIL;
+
+ if (type != SCAN_OUT && bitbang_interface->buf_size &&
+ (buffered == bitbang_interface->buf_size ||
+ bit_cnt == scan_size - 1)) {
+ for (unsigned i = bit_cnt + 1 - buffered; i <= bit_cnt; i++) {
+ switch (bitbang_interface->read_sample()) {
+ case BB_LOW:
+ buffer[i/8] &= ~(1 << (i % 8));
+ break;
+ case BB_HIGH:
+ buffer[i/8] |= 1 << (i % 8);
+ break;
+ default:
+ return ERROR_FAIL;
+ }
+ }
+ buffered = 0;
}
}
* the shift state, so we skip the first state
* and move directly to the end state.
*/
- bitbang_state_move(1);
+ if (bitbang_state_move(1) != ERROR_OK)
+ return ERROR_FAIL;
}
+ return ERROR_OK;
}
int bitbang_execute_queue(void)
*/
retval = ERROR_OK;
- if (bitbang_interface->blink)
- bitbang_interface->blink(1);
+ if (bitbang_interface->blink) {
+ if (bitbang_interface->blink(1) != ERROR_OK)
+ return ERROR_FAIL;
+ }
while (cmd) {
switch (cmd->type) {
if ((cmd->cmd.reset->trst == 1) ||
(cmd->cmd.reset->srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
tap_set_state(TAP_RESET);
- bitbang_interface->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
+ if (bitbang_interface->reset(cmd->cmd.reset->trst,
+ cmd->cmd.reset->srst) != ERROR_OK)
+ return ERROR_FAIL;
break;
case JTAG_RUNTEST:
#ifdef _DEBUG_JTAG_IO_
tap_state_name(cmd->cmd.runtest->end_state));
#endif
bitbang_end_state(cmd->cmd.runtest->end_state);
- bitbang_runtest(cmd->cmd.runtest->num_cycles);
+ if (bitbang_runtest(cmd->cmd.runtest->num_cycles) != ERROR_OK)
+ return ERROR_FAIL;
break;
case JTAG_STABLECLOCKS:
/* this is only allowed while in a stable state. A check for a stable
* state was done in jtag_add_clocks()
*/
- bitbang_stableclocks(cmd->cmd.stableclocks->num_cycles);
+ if (bitbang_stableclocks(cmd->cmd.stableclocks->num_cycles) != ERROR_OK)
+ return ERROR_FAIL;
break;
case JTAG_TLR_RESET:
tap_state_name(cmd->cmd.statemove->end_state));
#endif
bitbang_end_state(cmd->cmd.statemove->end_state);
- bitbang_state_move(0);
+ if (bitbang_state_move(0) != ERROR_OK)
+ return ERROR_FAIL;
break;
case JTAG_PATHMOVE:
#ifdef _DEBUG_JTAG_IO_
cmd->cmd.pathmove->num_states,
tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
#endif
- bitbang_path_move(cmd->cmd.pathmove);
+ if (bitbang_path_move(cmd->cmd.pathmove) != ERROR_OK)
+ return ERROR_FAIL;
break;
case JTAG_SCAN:
+ bitbang_end_state(cmd->cmd.scan->end_state);
+ scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("%s scan end in %s",
+ LOG_DEBUG("%s scan %d bits; end in %s",
(cmd->cmd.scan->ir_scan) ? "IR" : "DR",
+ scan_size,
tap_state_name(cmd->cmd.scan->end_state));
#endif
- bitbang_end_state(cmd->cmd.scan->end_state);
- scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
type = jtag_scan_type(cmd->cmd.scan);
- bitbang_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size);
+ if (bitbang_scan(cmd->cmd.scan->ir_scan, type, buffer,
+ scan_size) != ERROR_OK)
+ return ERROR_FAIL;
if (jtag_read_buffer(buffer, cmd->cmd.scan) != ERROR_OK)
retval = ERROR_JTAG_QUEUE_FAILED;
if (buffer)
}
cmd = cmd->next;
}
- if (bitbang_interface->blink)
- bitbang_interface->blink(0);
+ if (bitbang_interface->blink) {
+ if (bitbang_interface->blink(0) != ERROR_OK)
+ return ERROR_FAIL;
+ }
return retval;
}
projects / openocd / blobdiff