Merge pull request #464 from ADVANSEE/cc2538-pm2-sram
cc2538: lpm: Give access to the SRAM non-retention area for PM2
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commit
97cdf39b95
2 changed files with 24 additions and 4 deletions
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@ -34,6 +34,8 @@
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* ld script, which is called cc2538.ld and will be in the project directory
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*/
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#if (LPM_CONF_MAX_PM==2) && (LPM_CONF_ENABLE != 0)
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#define NRSRAM_START 0x20000000
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#define NRSRAM_LEN 0x00004000
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#define SRAM_START 0x20004000
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#define SRAM_LEN 0x00004000
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#else
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@ -45,6 +47,9 @@ MEMORY
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{
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FLASH (rx) : ORIGIN = 0x200000, LENGTH = 0x0007FFD4
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FLASH_CCA (RX) : ORIGIN = 0x0027FFD4, LENGTH = 12
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#if (LPM_CONF_MAX_PM==2) && (LPM_CONF_ENABLE != 0)
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NRSRAM (RWX) : ORIGIN = NRSRAM_START, LENGTH = NRSRAM_LEN
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#endif
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SRAM (RWX) : ORIGIN = SRAM_START, LENGTH = SRAM_LEN
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}
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@ -80,6 +85,15 @@ SECTIONS
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_ebss = .;
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} > SRAM
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#if (LPM_CONF_MAX_PM==2) && (LPM_CONF_ENABLE != 0)
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.nrdata :
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{
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_nrdata = .;
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*(.nrdata*)
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_enrdata = .;
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} > NRSRAM
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#endif
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.flashcca :
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{
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KEEP(*(.flashcca))
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@ -126,6 +126,12 @@ void lpm_init(void);
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* lpm_exit(), which will always be called from within the Sleep Timer ISR
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* context.
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*
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* \note Dropping to PM2 means that data in the SRAM non-retention area will
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* be lost. It is recommended to disable PM2 if the total RAM footprint is
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* larger than what will fit in the retention area.
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* .nrdata* sections can be used to place uninitialized data in the SRAM
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* non-retention area.
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*
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* \sa main(), rtimer_arch_next_trigger(), lpm_exit(), lpm_set_max_pm()
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*/
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void lpm_enter(void);
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