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cpu: add BACKUP_RAM attribute #13646

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Merged
gschorcht merged 4 commits into from
Mar 19, 2020
Merged

cpu: add BACKUP_RAM attribute #13646

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a11bcdc
cpu/cortexm_common: define BACKUP_RAM attribute
benpicco Mar 16, 2020
b8e18d5
cpu/esp32: define BACKUP_RAM attribute
benpicco Mar 16, 2020
69551d4
cpu/lpc2387: define BACKUP_RAM attribute
benpicco Mar 16, 2020
aff99b6
tests/periph_backup_ram: use BACKUP_RAM attribute
benpicco Mar 16, 2020
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14 changes: 14 additions & 0 deletions cpu/cortexm_common/include/cpu_conf_common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,20 @@ extern "C" {
*/
#define PUF_SRAM_ATTRIBUTES __attribute__((used, section(".puf")))

#if CPU_HAS_BACKUP_RAM || DOXYGEN
/**
* @brief Memory marked with this attribute is retained during deep sleep
* and initialized with 0 on cold boot.
*/
#define BACKUP_RAM __attribute__((section(".backup.bss")))

/**
* @brief Memory marked with this attribute is retained during deep sleep
* and initialized with user provided data on cold boot.
*/
#define BACKUP_RAM_DATA __attribute__((section(".backup.data")))
#endif /* CPU_HAS_BACKUP_RAM */

#ifdef __cplusplus
}
#endif
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12 changes: 12 additions & 0 deletions cpu/esp32/include/cpu_conf.h
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Expand Up @@ -51,6 +51,18 @@ extern "C" {
*/
#define PRINTF_BUFSIZ 256

/**
* @brief Memory marked with this attribute is retained during deep sleep
* and initialized with 0 on cold boot.
*/
#define BACKUP_RAM __attribute__((section(".rtc.bss")))

/**
* @brief Memory marked with this attribute is retained during deep sleep
* and initialized with user provided data on cold boot.
*/
#define BACKUP_RAM_DATA __attribute__((section(".rtc.data")))

#ifdef __cplusplus
}
#endif /* CPU_CONF_H */
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13 changes: 12 additions & 1 deletion cpu/lpc2387/include/cpu_conf.h
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Expand Up @@ -6,7 +6,6 @@
* directory for more details.
*/


#ifndef CPU_CONF_H
#define CPU_CONF_H

Expand Down Expand Up @@ -127,6 +126,18 @@ extern "C" {
*/
#define NUM_HEAPS (4)

/**
* @brief Memory marked with this attribute is retained during deep sleep
* and initialized with 0 on cold boot.
*/
#define BACKUP_RAM __attribute__((section(".backup.bss")))

/**
* @brief Memory marked with this attribute is retained during deep sleep
* and initialized with user provided data on cold boot.
*/
#define BACKUP_RAM_DATA __attribute__((section(".backup.data")))

#ifdef __cplusplus
}
#endif
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2 changes: 1 addition & 1 deletion tests/periph_backup_ram/main.c
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Expand Up @@ -39,7 +39,7 @@ int main(void)
* counter anyway after wakeup, we did not sleep properly.
*/
static int counter_noinit __attribute__((section(".noinit")));
static int counter __attribute__((section(".backup.bss")));
static int counter BACKUP_RAM;

if (counter == 0) {
puts("\nBackup RAM test\n");
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