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address hw pin-reset while sleep.

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This commit is contained in:
jun2sak 2021-03-07 20:20:29 +09:00
parent 2795c002ad
commit 7430b92d27
1 changed files with 28 additions and 21 deletions
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49
ports/nrf/supervisor/qspi_flash.c
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@ -41,6 +41,27 @@
#include "supervisor/serial.h" // dbg_printf()
#endif
#ifdef QSPI_FLASH_POWERDOWN
// Parameters for external QSPI Flash power-down
// for W25Q128FV,
// tDP (nCS high to Power-down mode) = 3us
// tRES (nCS high to Standby mode) = 3us
// sck_delay = max(tDP, tRES) / 62.5ns = 48 -> 50 (w/ margin)
#define DUR_DPM_ENTER 1 // tDP in (256*62.5ns) units
#define DUR_DPM_EXIT 1 // tRES in (256*62.5ns) units
#define SCK_DELAY 50 // max(tDP, tRES) in (62.5ns) units
// wait necessary just after DPM enter/exit (cut and try)
#define WAIT_AFTER_DPM_ENTER 10 // usec
#define WAIT_AFTER_DPM_EXIT 50 // usec
#endif
static int sck_delay_saved = 0;
#ifdef NRF_DEBUG_PRINT
extern void dbg_dumpQSPIreg(void);
#else
#define dbg_dumpQSPIreg(...)
#endif
// When USB is disconnected, disable QSPI in sleep mode to save energy
void qspi_disable(void)
{
@ -222,6 +243,13 @@ void spi_flash_init(void) {
// No callback for blocking API
nrfx_qspi_init(&qspi_cfg, NULL, NULL);
#ifdef QSPI_FLASH_POWERDOWN
// If pin-reset while flash is in power-down mode,
// the flash cannot accept any commands. Send CMD_WAKE to release it.
spi_flash_write_command(CMD_WAKE, NULL, 0);
NRFX_DELAY_US(WAIT_AFTER_DPM_EXIT);
#endif
}
void spi_flash_init_device(const external_flash_device* device) {
@ -246,27 +274,6 @@ void spi_flash_init_device(const external_flash_device* device) {
NRF_QSPI->IFCONFIG1 |= sckfreq << QSPI_IFCONFIG1_SCKFREQ_Pos;
}
#ifdef QSPI_FLASH_POWERDOWN
// Parameters for external QSPI Flash power-down
// for W25Q128FV,
// tDP (nCS high to Power-down mode) = 3us
// tRES (nCS high to Standby mode) = 3us
// sck_delay = max(tDP, tRES) / 62.5ns = 48 -> 50 (w/ margin)
#define DUR_DPM_ENTER 1 // tDP in (256*62.5ns) units
#define DUR_DPM_EXIT 1 // tRES in (256*62.5ns) units
#define SCK_DELAY 50 // max(tDP, tRES) in (62.5ns) units
// wait necessary just after DPM enter/exit (cut and try)
#define WAIT_AFTER_DPM_ENTER 10 // usec
#define WAIT_AFTER_DPM_EXIT 50 // usec
#endif
static int sck_delay_saved = 0;
#ifdef NRF_DEBUG_PRINT
extern void dbg_dumpQSPIreg(void);
#else
#define dbg_dumpQSPIreg(...)
#endif
void qspi_flash_enter_sleep(void) {
#ifdef QSPI_FLASH_POWERDOWN
uint32_t r;