Improve sensortag external flash power management:

* Explicitly put in deep sleep on device startup
* Verify that the flash has actually dropped to deep sleep
* Update CLK pin to match the one used on the v1.2 sensortag

Obsoletes and Closes #988
This commit is contained in:
George Oikonomou 2015-05-01 16:23:15 +01:00
parent cf99160706
commit 4378217462
4 changed files with 79 additions and 47 deletions

View File

@ -142,6 +142,9 @@ board_init()
buzzer_init();
/* Make sure the external flash is in the lower power mode */
ext_flash_init();
lpm_register_module(&sensortag_module);
/* Re-enable interrupt if initially enabled. */

View File

@ -156,7 +156,7 @@
*/
#define BOARD_IOID_FLASH_CS IOID_14
#define BOARD_FLASH_CS (1 << BOARD_IOID_FLASH_CS)
#define BOARD_SPI_CLK_FLASH IOID_11
#define BOARD_IOID_SPI_CLK_FLASH IOID_17
/** @} */
/*---------------------------------------------------------------------------*/
/**

View File

@ -72,7 +72,7 @@
/* Part specific constants */
#define BLS_MANUFACTURER_ID 0xEF
#define BLS_DEVICE_ID 0x11
#define BLS_DEVICE_ID 0x12
#define BLS_PROGRAM_PAGE_SIZE 256
#define BLS_ERASE_SECTOR_SIZE 4096
@ -140,50 +140,8 @@ wait_ready(void)
}
/*---------------------------------------------------------------------------*/
/**
* \brief Put the device in power save mode. No access to data; only
* the status register is accessible.
* \return True when SPI transactions succeed
*/
static bool
power_down(void)
{
uint8_t cmd;
bool success;
cmd = BLS_CODE_DP;
select();
success = board_spi_write(&cmd, sizeof(cmd));
deselect();
return success;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Take device out of power save mode and prepare it for normal operation
* \return True if the command was written successfully
*/
static bool
power_standby(void)
{
uint8_t cmd;
bool success;
cmd = BLS_CODE_RDP;
select();
success = board_spi_write(&cmd, sizeof(cmd));
if(success) {
success = wait_ready() == 0;
}
deselect();
return success;
}
/*---------------------------------------------------------------------------*/
/**
* Verify the flash part.
* @return True when successful.
* \brief Verify the flash part.
* \return True when successful.
*/
static bool
verify_part(void)
@ -210,6 +168,57 @@ verify_part(void)
return true;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Put the device in power save mode. No access to data; only
* the status register is accessible.
*/
static void
power_down(void)
{
uint8_t cmd;
uint8_t i;
cmd = BLS_CODE_DP;
select();
board_spi_write(&cmd, sizeof(cmd));
deselect();
i = 0;
while(i < 10) {
if(!verify_part()) {
/* Verify Part failed: Device is powered down */
return;
}
i++;
}
/* Should not be required */
deselect();
}
/*---------------------------------------------------------------------------*/
/**
* \brief Take device out of power save mode and prepare it for normal operation
* \return True if the command was written successfully
*/
static bool
power_standby(void)
{
uint8_t cmd;
bool success;
cmd = BLS_CODE_RDP;
select();
success = board_spi_write(&cmd, sizeof(cmd));
if(success) {
success = wait_ready() == 0;
}
deselect();
return success;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Enable write.
* \return Zero when successful.
@ -232,7 +241,7 @@ write_enable(void)
bool
ext_flash_open()
{
board_spi_open(4000000, BOARD_SPI_CLK_FLASH);
board_spi_open(4000000, BOARD_IOID_SPI_CLK_FLASH);
/* GPIO pin configuration */
ti_lib_ioc_pin_type_gpio_output(BOARD_IOID_FLASH_CS);
@ -406,4 +415,11 @@ ext_flash_test(void)
return ret;
}
/*---------------------------------------------------------------------------*/
void
ext_flash_init()
{
ext_flash_open();
ext_flash_close();
}
/*---------------------------------------------------------------------------*/
/** @} */

View File

@ -54,6 +54,8 @@ bool ext_flash_open(void);
/**
* \brief Close the storage driver
*
* This call will put the device in its lower power mode (power down).
*/
void ext_flash_close(void);
@ -94,6 +96,17 @@ bool ext_flash_write(size_t offset, size_t length, const uint8_t *buf);
* \return True when successful.
*/
bool ext_flash_test(void);
/**
* \brief Initialise the external flash
*
* This function will explicitly put the part in its lowest power mode
* (power-down).
*
* In order to perform any operation, the caller must first wake the device
* up by calling ext_flash_open()
*/
void ext_flash_init(void);
/*---------------------------------------------------------------------------*/
#endif /* EXT_FLASH_H_ */
/*---------------------------------------------------------------------------*/