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Place data from .uicrREGOUT0 into UICR.REGOUT0 flash word. #139

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Place data from .uicrREGOUT0 into UICR.REGOUT0 flash word. #139

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d6019de
Place data from .uicrREGOUT0 into UICR.REGOUT0 flash word.
geeksville Jun 4, 2020
9478eb7
address comments from review (warn users, also support 833)
geeksville Jun 16, 2020
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16 changes: 16 additions & 0 deletions linker/nrf52833.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,16 @@ MEMORY

/** Location in UICR where mbr params page address is stored. */
UICR_MBR_PARAM_PAGE(r) : ORIGIN = 0x10001018, LENGTH = 0x04

/** Location in UICR of REGOUT0 (used to set voltage levels for VCC at boot)
*
* IMPORTANT NOTE: This controls the voltage provided on the VCC output of the CPU. Changing this value from the default
* can physically damage parts on your board. If using a SWD debugger you should consider connecting the Vref input
* for that debugger to the VCC rail. Think carefully before using this feature.
* Example usage:
* __attribute__ ((section(".uicrREGOUT0"))) volatile uint32_t m_uicr_regout0 = 0xfffffff4;
*/
UICR_REGOUT0(r) : ORIGIN = 0x10001304, LENGTH = 0x04
}

SECTIONS
Expand Down Expand Up @@ -74,6 +84,12 @@ SECTIONS
KEEP(*(.uicrMbrParamsPageAddress))
} > UICR_MBR_PARAM_PAGE

/* Write REGOUT0 in UICR. */
.uicrREGOUT0 :
{
KEEP(*(.uicrREGOUT0))
} > UICR_REGOUT0

.dbl_reset(NOLOAD) :
{

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16 changes: 16 additions & 0 deletions linker/nrf52840.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,16 @@ MEMORY

/** Location in UICR where mbr params page address is stored. */
UICR_MBR_PARAM_PAGE(r) : ORIGIN = 0x10001018, LENGTH = 0x04

/** Location in UICR of REGOUT0 (used to set voltage levels for VCC at boot)
*
* IMPORTANT NOTE: This controls the voltage provided on the VCC output of the CPU. Changing this value from the default
* can physically damage parts on your board. If using a SWD debugger you should consider connecting the Vref input
* for that debugger to the VCC rail. Think carefully before using this feature.
* Example usage:
* __attribute__ ((section(".uicrREGOUT0"))) volatile uint32_t m_uicr_regout0 = 0xfffffff4;
*/
UICR_REGOUT0(r) : ORIGIN = 0x10001304, LENGTH = 0x04
}

SECTIONS
Expand Down Expand Up @@ -81,6 +91,12 @@ SECTIONS
KEEP(*(.uicrMbrParamsPageAddress))
} > UICR_MBR_PARAM_PAGE

/* Write REGOUT0 in UICR. */
.uicrREGOUT0 :
{
KEEP(*(.uicrREGOUT0))
} > UICR_REGOUT0

.dbl_reset(NOLOAD) :
{

Expand Down