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SPI:fix spi slave example sender ccount issue

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On riscv core, core cycle counter counts the clock cycles only when core is active (not sleeping).
In spi_slave/sender example, it uses ccount (core cycle counter) to do a simple debounce.
Therefore, when using spi_slave/sender and spi_slave/receiver, program will be stuck.
This commit fix this issue by using esp_timer


(cherry picked from commit afe3bfe19f)
This commit is contained in:
gaoxu
2022-06-13 14:22:57 +08:00
committed by Gao Xu
parent 228cbc4dae
commit 7a2bad690b
1 changed files with 14 additions and 25 deletions
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39
examples/peripherals/spi_slave/sender/main/app_main.c
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@ -10,29 +10,14 @@
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "freertos/queue.h"
#include "lwip/sockets.h"
#include "lwip/dns.h"
#include "lwip/netdb.h"
#include "lwip/igmp.h"
#include "esp_wifi.h"
#include "esp_system.h"
#include "esp_event.h"
#include "nvs_flash.h"
#include "soc/rtc_periph.h"
#include "driver/spi_master.h"
#include "esp_log.h"
#include "esp_spi_flash.h"
#include "driver/gpio.h"
#include "esp_intr_alloc.h"
#include "esp_timer.h"
/*
SPI sender (master) example.
@ -80,7 +65,7 @@ Pins in use. The SPI Master can use the GPIO mux, so feel free to change these i
//The semaphore indicating the slave is ready to receive stuff.
static xQueueHandle rdySem;
static QueueHandle_t rdySem;
/*
This ISR is called when the handshake line goes high.
@ -89,16 +74,20 @@ static void IRAM_ATTR gpio_handshake_isr_handler(void* arg)
{
//Sometimes due to interference or ringing or something, we get two irqs after eachother. This is solved by
//looking at the time between interrupts and refusing any interrupt too close to another one.
static uint32_t lasthandshaketime;
uint32_t currtime=esp_cpu_get_ccount();
uint32_t diff=currtime-lasthandshaketime;
if (diff<240000) return; //ignore everything <1ms after an earlier irq
lasthandshaketime=currtime;
static uint32_t lasthandshaketime_us;
uint32_t currtime_us = esp_timer_get_time();
uint32_t diff = currtime_us - lasthandshaketime_us;
if (diff < 1000) {
return; //ignore everything <1ms after an earlier irq
}
lasthandshaketime_us = currtime_us;
//Give the semaphore.
BaseType_t mustYield=false;
BaseType_t mustYield = false;
xSemaphoreGiveFromISR(rdySem, &mustYield);
if (mustYield) portYIELD_FROM_ISR();
if (mustYield) {
portYIELD_FROM_ISR();
}
}
//Main application