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/* SPI Slave example, receiver (uses SPI Slave driver to communicate with sender)
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/semphr.h"
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#include "freertos/queue.h"
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#include "lwip/sockets.h"
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#include "lwip/dns.h"
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#include "lwip/netdb.h"
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#include "lwip/igmp.h"
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#include "esp_wifi.h"
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#include "esp_system.h"
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#include "esp_event.h"
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#include "nvs_flash.h"
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#include "soc/rtc_periph.h"
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#include "driver/spi_slave.h"
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#include "esp_log.h"
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#include "esp_spi_flash.h"
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#include "driver/gpio.h"
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/*
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SPI receiver (slave) example.
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This example is supposed to work together with the SPI sender. It uses the standard SPI pins (MISO, MOSI, SCLK, CS) to
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transmit data over in a full-duplex fashion, that is, while the master puts data on the MOSI pin, the slave puts its own
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data on the MISO pin.
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This example uses one extra pin: GPIO_HANDSHAKE is used as a handshake pin. After a transmission has been set up and we're
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ready to send/receive data, this code uses a callback to set the handshake pin high. The sender will detect this and start
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sending a transaction. As soon as the transaction is done, the line gets set low again.
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*/
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/*
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Pins in use. The SPI Master can use the GPIO mux, so feel free to change these if needed.
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*/
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#define GPIO_HANDSHAKE 2
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#define GPIO_MOSI 12
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#define GPIO_MISO 13
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#define GPIO_SCLK 15
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#define GPIO_CS 14
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#ifdef CONFIG_IDF_TARGET_ESP32
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#define RCV_HOST HSPI_HOST
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#define DMA_CHAN 2
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#elif defined CONFIG_IDF_TARGET_ESP32S2
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#define RCV_HOST SPI2_HOST
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#define DMA_CHAN RCV_HOST
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#endif
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//Called after a transaction is queued and ready for pickup by master. We use this to set the handshake line high.
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void my_post_setup_cb(spi_slave_transaction_t *trans) {
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WRITE_PERI_REG(GPIO_OUT_W1TS_REG, (1<<GPIO_HANDSHAKE));
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}
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//Called after transaction is sent/received. We use this to set the handshake line low.
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void my_post_trans_cb(spi_slave_transaction_t *trans) {
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WRITE_PERI_REG(GPIO_OUT_W1TC_REG, (1<<GPIO_HANDSHAKE));
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}
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//Main application
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void app_main(void)
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{
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int n=0;
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esp_err_t ret;
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//Configuration for the SPI bus
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spi_bus_config_t buscfg={
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.mosi_io_num=GPIO_MOSI,
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.miso_io_num=GPIO_MISO,
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.sclk_io_num=GPIO_SCLK,
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.quadwp_io_num = -1,
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.quadhd_io_num = -1,
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};
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//Configuration for the SPI slave interface
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spi_slave_interface_config_t slvcfg={
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.mode=0,
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.spics_io_num=GPIO_CS,
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.queue_size=3,
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.flags=0,
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.post_setup_cb=my_post_setup_cb,
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.post_trans_cb=my_post_trans_cb
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};
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//Configuration for the handshake line
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gpio_config_t io_conf={
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.intr_type=GPIO_INTR_DISABLE,
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.mode=GPIO_MODE_OUTPUT,
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.pin_bit_mask=(1<<GPIO_HANDSHAKE)
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};
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//Configure handshake line as output
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gpio_config(&io_conf);
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//Enable pull-ups on SPI lines so we don't detect rogue pulses when no master is connected.
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gpio_set_pull_mode(GPIO_MOSI, GPIO_PULLUP_ONLY);
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gpio_set_pull_mode(GPIO_SCLK, GPIO_PULLUP_ONLY);
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gpio_set_pull_mode(GPIO_CS, GPIO_PULLUP_ONLY);
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//Initialize SPI slave interface
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ret=spi_slave_initialize(RCV_HOST, &buscfg, &slvcfg, DMA_CHAN);
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assert(ret==ESP_OK);
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WORD_ALIGNED_ATTR char sendbuf[129]="";
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WORD_ALIGNED_ATTR char recvbuf[129]="";
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memset(recvbuf, 0, 33);
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spi_slave_transaction_t t;
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memset(&t, 0, sizeof(t));
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while(1) {
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//Clear receive buffer, set send buffer to something sane
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memset(recvbuf, 0xA5, 129);
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sprintf(sendbuf, "This is the receiver, sending data for transmission number %04d.", n);
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//Set up a transaction of 128 bytes to send/receive
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t.length=128*8;
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t.tx_buffer=sendbuf;
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t.rx_buffer=recvbuf;
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/* This call enables the SPI slave interface to send/receive to the sendbuf and recvbuf. The transaction is
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initialized by the SPI master, however, so it will not actually happen until the master starts a hardware transaction
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by pulling CS low and pulsing the clock etc. In this specific example, we use the handshake line, pulled up by the
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.post_setup_cb callback that is called as soon as a transaction is ready, to let the master know it is free to transfer
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data.
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*/
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ret=spi_slave_transmit(RCV_HOST, &t, portMAX_DELAY);
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//spi_slave_transmit does not return until the master has done a transmission, so by here we have sent our data and
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//received data from the master. Print it.
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printf("Received: %s\n", recvbuf);
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n++;
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}
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}
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kerwincui