fix(software) workaround by forcing SYSRESETQ on DAP_ResetTarget befo…

…re nRESET
windowsair · Apr 23, 2024 · e2140fd · e2140fd
1 parent cc4f747
commit e2140fd
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/components/DAP/source/DAP.c b/components/DAP/source/DAP.c
@@ -273,6 +273,13 @@ static uint32_t DAP_Disconnect(uint8_t *response) {
 //   return:   number of bytes in response
 static uint32_t DAP_ResetTarget(uint8_t *response) {
 
+  /* Workaround for software reset when nRESET is not connected */
+  uint32_t AIRCR_REG_ADDR = 0xE000ED0C;
+  uint32_t AIRCR_RESET_VAL = (0x05FA << 16 | 1 << 2); /* Vector key | SYSRESETREQ bit */
+  SWD_Transfer(0x05,&AIRCR_REG_ADDR);
+  dap_os_delay(2);
+  SWD_Transfer(0x0d,&AIRCR_RESET_VAL);
+
   *(response+1) = RESET_TARGET();
   *(response+0) = DAP_OK;
   return (2U);