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#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <freertos/FreeRTOS.h>
#include <freertos/semphr.h>
#include <freertos/task.h>
#include <esp_system.h>
#include <esp_log.h>
#include <esp_err.h>
#include <esp_heap_caps.h>
#include <driver/gpio.h>
#include <driver/spi_slave.h>
#include "eos.h"
#include "msgq.h"
#include "app.h"
#define SPI_GPIO_CTS 26
#define SPI_GPIO_RTS 27
#define SPI_GPIO_MOSI 13
#define SPI_GPIO_MISO 12
#define SPI_GPIO_SCLK 14
#define SPI_GPIO_CS 15
#define SPI_SIZE_BUF (EOS_APP_SIZE_BUF + 8)
#define SPI_SIZE_HDR 3
static EOSBufQ app_buf_q;
static unsigned char *app_bufq_array[EOS_APP_SIZE_BUFQ];
static EOSMsgQ app_send_q;
static EOSMsgItem app_sndq_array[EOS_APP_SIZE_SNDQ];
static SemaphoreHandle_t mutex;
static SemaphoreHandle_t semaph;
static TaskHandle_t app_xchg_task_handle;
static const char *TAG = "EOS APP";
static eos_app_fptr_t app_handler[EOS_APP_MAX_MTYPE];
static void bad_handler(unsigned char mtype, unsigned char *buffer, uint16_t len) {
ESP_LOGE(TAG, "bad handler: %d len: %d", mtype, len);
}
// Called after a transaction is queued and ready for pickup by master. We use this to set the handshake line high.
static void _post_setup_cb(spi_slave_transaction_t *trans) {
gpio_set_level(SPI_GPIO_CTS, 1);
}
// Called after transaction is sent/received. We use this to set the handshake line low.
static void _post_trans_cb(spi_slave_transaction_t *trans) {
gpio_set_level(SPI_GPIO_CTS, 0);
}
static void app_xchg_task(void *pvParameters) {
unsigned char mtype = 0;
unsigned char *buffer;
uint16_t len;
unsigned char *buf_send = heap_caps_malloc(SPI_SIZE_BUF, MALLOC_CAP_DMA);
unsigned char *buf_recv = heap_caps_malloc(SPI_SIZE_BUF, MALLOC_CAP_DMA);
esp_err_t ret;
size_t trans_len;
static spi_slave_transaction_t spi_tr;
//Configuration for the SPI bus
static spi_bus_config_t spi_bus_cfg = {
.mosi_io_num = SPI_GPIO_MOSI,
.miso_io_num = SPI_GPIO_MISO,
.sclk_io_num = SPI_GPIO_SCLK
};
//Configuration for the SPI slave interface
static spi_slave_interface_config_t spi_slave_cfg = {
.mode = 0,
.spics_io_num = SPI_GPIO_CS,
.queue_size = 2,
.flags = 0,
.post_setup_cb = _post_setup_cb,
.post_trans_cb = _post_trans_cb
};
//Initialize SPI slave interface
ret = spi_slave_initialize(HSPI_HOST, &spi_bus_cfg, &spi_slave_cfg, 1);
assert(ret == ESP_OK);
memset(&spi_tr, 0, sizeof(spi_tr));
spi_tr.tx_buffer = buf_send;
spi_tr.rx_buffer = buf_recv;
spi_tr.length = SPI_SIZE_BUF * 8;
while (1) {
xSemaphoreTake(mutex, portMAX_DELAY);
eos_msgq_pop(&app_send_q, &mtype, &buffer, &len);
if (mtype) {
buf_send[0] = mtype;
buf_send[1] = len >> 8;
buf_send[2] = len & 0xFF;
if (buffer) {
memcpy(buf_send + SPI_SIZE_HDR, buffer, len);
eos_bufq_push(&app_buf_q, buffer);
xSemaphoreGive(semaph);
}
} else {
gpio_set_level(SPI_GPIO_RTS, 0);
buf_send[0] = 0;
buf_send[1] = 0;
buf_send[2] = 0;
len = 0;
}
xSemaphoreGive(mutex);
buf_recv[0] = 0;
buf_recv[1] = 0;
buf_recv[2] = 0;
spi_slave_transmit(HSPI_HOST, &spi_tr, portMAX_DELAY);
trans_len = spi_tr.trans_len / 8;
if (trans_len < SPI_SIZE_HDR) continue;
if (len + SPI_SIZE_HDR > trans_len) {
spi_tr.tx_buffer = buf_send + trans_len;
spi_tr.rx_buffer = buf_recv + trans_len;
spi_tr.length = (SPI_SIZE_BUF - trans_len) * 8;
spi_slave_transmit(HSPI_HOST, &spi_tr, portMAX_DELAY);
spi_tr.tx_buffer = buf_send;
spi_tr.rx_buffer = buf_recv;
spi_tr.length = SPI_SIZE_BUF * 8;
}
mtype = buf_recv[0] & ~EOS_APP_MTYPE_FLAG_MASK;
len = (uint16_t)buf_recv[1] << 8;
len |= (uint16_t)buf_recv[2] & 0xFF;
buffer = buf_recv + 3;
if (mtype == 0x00) continue;
if ((mtype <= EOS_APP_MAX_MTYPE) && (len <= EOS_APP_MTU)) {
app_handler[mtype - 1](mtype, buffer, len);
} else {
bad_handler(mtype, buffer, len);
}
}
vTaskDelete(NULL);
}
void eos_app_init(void) {
int i;
// Configuration for the handshake lines
gpio_config_t io_conf = {};
io_conf.intr_type = GPIO_INTR_DISABLE;
io_conf.mode = GPIO_MODE_OUTPUT;
io_conf.pull_up_en = 0;
io_conf.pull_down_en = 0;
io_conf.pin_bit_mask = ((uint64_t)1 << SPI_GPIO_CTS);
gpio_config(&io_conf);
gpio_set_level(SPI_GPIO_CTS, 0);
io_conf.intr_type = GPIO_INTR_DISABLE;
io_conf.mode = GPIO_MODE_OUTPUT;
io_conf.pull_up_en = 0;
io_conf.pull_down_en = 0;
io_conf.pin_bit_mask = ((uint64_t)1 << SPI_GPIO_RTS);
gpio_config(&io_conf);
gpio_set_level(SPI_GPIO_RTS, 0);
eos_msgq_init(&app_send_q, app_sndq_array, EOS_APP_SIZE_SNDQ);
eos_bufq_init(&app_buf_q, app_bufq_array, EOS_APP_SIZE_BUFQ);
for (i=0; i<EOS_APP_SIZE_BUFQ; i++) {
eos_bufq_push(&app_buf_q, malloc(EOS_APP_SIZE_BUF));
}
for (i=0; i<EOS_APP_MAX_MTYPE; i++) {
app_handler[i] = bad_handler;
}
semaph = xSemaphoreCreateCounting(EOS_APP_SIZE_BUFQ, EOS_APP_SIZE_BUFQ);
mutex = xSemaphoreCreateBinary();
xSemaphoreGive(mutex);
xTaskCreate(&app_xchg_task, "app_xchg", EOS_TASK_SSIZE_APP_XCHG, NULL, EOS_TASK_PRIORITY_APP_XCHG, &app_xchg_task_handle);
ESP_LOGI(TAG, "INIT");
}
unsigned char *eos_app_alloc(void) {
unsigned char *ret;
xSemaphoreTake(semaph, portMAX_DELAY);
xSemaphoreTake(mutex, portMAX_DELAY);
ret = eos_bufq_pop(&app_buf_q);
xSemaphoreGive(mutex);
return ret;
}
void eos_app_free(unsigned char *buf) {
xSemaphoreTake(mutex, portMAX_DELAY);
eos_bufq_push(&app_buf_q, buf);
xSemaphoreGive(semaph);
xSemaphoreGive(mutex);
}
int eos_app_send(unsigned char mtype, unsigned char *buffer, uint16_t len) {
int rv = EOS_OK;
xSemaphoreTake(mutex, portMAX_DELAY);
gpio_set_level(SPI_GPIO_RTS, 1);
rv = eos_msgq_push(&app_send_q, mtype, buffer, len);
xSemaphoreGive(mutex);
if (rv) eos_app_free(buffer);
return rv;
}
void eos_app_set_handler(unsigned char mtype, eos_app_fptr_t handler) {
if (handler == NULL) handler = bad_handler;
if (mtype && (mtype <= EOS_APP_MAX_MTYPE)) app_handler[mtype - 1] = handler;
}
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