SWD Interface
GR5xx SoCs provide an SWD interface. Disabling the SWD interface can prevent unauthorized external access.
In security mode, when users download security mode control files in which SWD interface disabled to eFuse, the SWD interface will be disabled. Users can disable the SWD interface when generating the file to be downloaded to eFuse (Mode_control.bin) with GProgrammer. When SWD is disabled, users can also upgrade firmware through DFU. Alternatively, users can also enable the SWD interface with the corresponding register by programming the local application.
Because eFuse is one-time programmable, once the SWD interface is disabled by programming the security mode control file, the disablement is unrecoverable.
Register
| Bits | Field Name | RW | Reset | Description |
|---|---|---|---|---|
| SoC
series: GR551x Register address: 0xA000C504 |
||||
|
17 |
SWD_ENABLE |
RW |
0x0 |
Enable SWD debugging. Value:
|
| Other
SoC series Register address: 0x4000A004 |
||||
|
8 |
SWD_ENABLE |
RW |
0x0 |
Enable SWD debugging. Value:
|
APIs
| Function Prototype |
void sys_swd_enable(void) |
|---|---|
| Function Description |
Enable SWD interface. |
| Input Parameter |
None |
| Return Value |
None |
| Remarks |
| Function Prototype |
void sys_swd_disable(void) |
|---|---|
| Function Description |
Disable SWD interface. |
| Input Parameter |
None |
| Return Value |
None |
| Remarks |
