syscntl_dcdc_turn_on_in_boost_ROM() leads to a hardfault when DA14531-01 and DA14535 configured in bypass mode

ID: LPCBARESDK-1079

Status: Fixed

First reported: 6.0.20.1338

Fixed in: 6.0.24.1464

Description

The DA14531-01, a ROM variant of the primary DA14531-00, and DA14535 underwent a transfer of several SDK modules from SDK (RAM) to DA14531-01 and DA14535 ROM in order to conserve RAM space. During this update, a portion of the DCDC functions were relocated to ROM. However, an oversight occurred where the bypass flag, CFG_POWER_MODE_BYPASS, was incorrectly designated to not be a parameter controlled by ROM.

If the DA14531-01 or DA14535 is utilized in bypass mode, the function syscntl_dcdc_turn_on_in_boost_ROM() triggers a hardfault.

This issue will NOT arise in:

DA14531-00, as there is no corresponding ROM function.
DA14530, as there is no equivalent ROM function.

Workaround

Deactivate the ROM function and switch to the RAM alternative for the Bypass scenario. Implement this patch by refraining from employing syscntl_dcdc_turn_on_in_boost_ROM and reverting to the original syscntl_dcdc_turn_on_in_boost function. The following code modification should be applied in /sdk/platform/driver/syscntl/syscntl.c:

diff --git a/sdk/platform/driver/syscntl/syscntl.c b/sdk/platform/driver/syscntl/syscntl.c
index ac35327..a9eef87 100644
--- a/sdk/platform/driver/syscntl/syscntl.c
+++ b/sdk/platform/driver/syscntl/syscntl.c
@@ -179,7 +179,7 @@ int8_t syscntl_dcdc_turn_off(void)
 }
 #endif

-#if (defined (__DA14531_01__) || defined (__DA14535__)) && !defined (__EXCLUDE_ROM_SYSCNTL__)
+#if !defined (__EXCLUDE_ROM_SYSCNTL__)
 int8_t syscntl_dcdc_turn_on_in_boost(syscntl_dcdc_level_t level)
 {
     return (syscntl_dcdc_turn_on_in_boost_ROM(level, &syscntl_dcdc_state, dcdc_reserved));