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fix software reset by writing in SYSRESETQ register when a reset is requested #73

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merged 3 commits into from
May 7, 2024
Merged

fix software reset by writing in SYSRESETQ register when a reset is requested #73

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e2140fd
fix(software) workaround by forcing SYSRESETQ on DAP_ResetTarget befo…
kerms Apr 23, 2024
9d238af
fix(soft reset) add conf to use this feature and add test to work onl…
kerms Apr 25, 2024
4f163e0
feat(dap): Add option to force a software reset when reset the target
windowsair May 7, 2024
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16 changes: 16 additions & 0 deletions components/DAP/source/DAP.c
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Original file line number Diff line number Diff line change
Expand Up @@ -273,6 +273,22 @@ static uint32_t DAP_Disconnect(uint8_t *response) {
// return: number of bytes in response
static uint32_t DAP_ResetTarget(uint8_t *response) {

#if (USE_MANUAL_SYSRESETQ_AFTER_FLASH)
if (DAP_Data.debug_port == DAP_PORT_SWD) {
/* Workaround for software reset when nRESET is not connected */
uint8_t ack;
uint32_t AIRCR_REG_ADDR = 0xE000ED0C;
uint32_t AIRCR_RESET_VAL = 0x05FA << 16 | 1 << 2; /* Vector key | SYSRESETREQ bit */
uint8_t req = DAP_TRANSFER_APnDP | 0 | DAP_TRANSFER_A2 | 0;
ack = SWD_Transfer(req,&AIRCR_REG_ADDR);
if (ack == DAP_TRANSFER_OK) {
dap_os_delay(2);
req = DAP_TRANSFER_APnDP | 0 | DAP_TRANSFER_A2 | DAP_TRANSFER_A3;
SWD_Transfer(req,&AIRCR_RESET_VAL);
}
}
#endif

*(response+1) = RESET_TARGET();
*(response+0) = DAP_OK;
return (2U);
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6 changes: 6 additions & 0 deletions main/dap_configuration.h
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Expand Up @@ -40,4 +40,10 @@
#endif


/**
* @brief Workaround for single core Cortex-M, manual write to AIRCB core register
*/
#define USE_MANUAL_SYSRESETQ_AFTER_FLASH 0


#endif