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boards: cxd56xx: Fix bug that modem may miss the GPIO interrupt

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If the GPIO falls within 300us after raising
(or GPIO raises within 300us after falling), the modem may miss the GPIO
interrupt. So add delay by 300us before changing the GPIO.
This commit is contained in:
SPRESENSE 2021-05-19 18:38:29 +09:00 committed by Alin Jerpelea
parent 14c57b0774
commit 0146231166
1 changed files with 9 additions and 0 deletions
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9
boards/arm/cxd56xx/common/src/cxd56_altmdm.c
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@ -30,6 +30,7 @@
#include <stdio.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/arch.h>
#include <nuttx/board.h>
#include <nuttx/spi/spi.h>
@ -74,6 +75,8 @@
# error "Select LTE SPI 4 or 5"
#endif
#define WAIT_READY_TO_GPIO_INTERRUPT 300 /* micro seconds */
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
@ -313,6 +316,12 @@ static bool altmdm_sready(void)
static void altmdm_master_request(bool request)
{
/* If the GPIO falls within 300us after raising
* (or GPIO raises within 300us after falling), the modem may miss the GPIO
* interrupt. So delay by 300us before changing the GPIO.
*/
up_udelay(WAIT_READY_TO_GPIO_INTERRUPT);
cxd56_gpio_write(ALTMDM_MASTER_REQ, request);
}