From 01c3e3af2394f863323b846fa304ff7e0a30e9df Mon Sep 17 00:00:00 2001
From: Uros Majstorovic <majstor@majstor.org>
Date: Tue, 16 Jan 2018 23:43:07 +0100
Subject: eos support

---
 code/esp32/components/eos/fe310.c | 180 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 180 insertions(+)
 create mode 100644 code/esp32/components/eos/fe310.c

(limited to 'code/esp32/components/eos/fe310.c')

diff --git a/code/esp32/components/eos/fe310.c b/code/esp32/components/eos/fe310.c
new file mode 100644
index 0000000..6dceb51
--- /dev/null
+++ b/code/esp32/components/eos/fe310.c
@@ -0,0 +1,180 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <freertos/semphr.h>
+// #include <freertos/heap_regions.h>
+
+#include <esp_system.h>
+#include <esp_event.h>
+#include <esp_event_loop.h>
+#include <esp_log.h>
+#include <esp_err.h>
+#include <esp_heap_caps.h>
+#include <driver/spi_slave.h>
+
+#include "msgq.h"
+#include "transport.h"
+#include "fe310.h"
+
+static EOSMsgQ send_q;
+static EOSMsgItem send_q_array[EOS_FE310_SIZE_Q];
+
+#define SPI_GPIO_RTS        4
+#define SPI_GPIO_CTS        2
+#define SPI_GPIO_MOSI       23
+#define SPI_GPIO_MISO       19
+#define SPI_GPIO_SCLK       18
+#define SPI_GPIO_CS         5
+
+static SemaphoreHandle_t mutex;
+
+static const char *TAG = "EOS";
+
+static eos_fe310_fptr_t cmd_handler[EOS_FE310_MAX_CMD];
+
+static void bad_handler(unsigned char cmd, unsigned char *buffer, uint16_t len) {
+    ESP_LOGI(TAG, "FE310 RECV: bad handler: %d", cmd);
+}
+
+static void worker(void *pvParameters) {
+    int repeat = 0;
+    esp_err_t ret;
+    unsigned char cmd = 0;
+    unsigned char *buffer;
+    uint16_t len;
+    unsigned char *buf_send = heap_caps_malloc(EOS_FE310_SIZE_BUF, MALLOC_CAP_DMA);
+    unsigned char *buf_recv = heap_caps_malloc(EOS_FE310_SIZE_BUF, MALLOC_CAP_DMA);
+
+    spi_slave_transaction_t t;
+    memset(&t, 0, sizeof(t));
+    t.length = EOS_FE310_SIZE_BUF*8;
+    t.tx_buffer = buf_send;
+    t.rx_buffer = buf_recv;
+    
+    xSemaphoreTake(mutex, portMAX_DELAY);
+    for (;;) {
+        if (!repeat) {
+            eos_msgq_pop(&send_q, &cmd, &buffer, &len);
+            if (cmd) {
+                buf_send[0] = ((cmd << 3) | (len >> 8)) & 0xFF;
+                buf_send[1] = len & 0xFF;
+                if (buffer) memcpy(buf_send + 2, buffer, len);
+            } else {
+                WRITE_PERI_REG(GPIO_OUT_W1TC_REG, (1 << SPI_GPIO_RTS));
+                buf_send[0] = 0;
+                buf_send[1] = 0;
+            }
+        }
+        memset(buf_recv, 0, EOS_FE310_SIZE_BUF);
+        ret = spi_slave_transmit(HSPI_HOST, &t, portMAX_DELAY);
+
+        repeat = 0;
+        if (buf_recv[0] != 0) {
+            xSemaphoreGive(mutex);
+            
+            cmd = (buf_recv[0] >> 3);
+            len = ((buf_recv[0] & 0x07) << 8);
+            len |= buf_recv[1];
+            buffer = buf_recv + 2;
+            if (cmd & EOS_FE310_CMD_FLAG_ONEW) {
+                cmd &= ~EOS_FE310_CMD_FLAG_ONEW;
+                if (buf_send[0]) repeat = 1;
+            }
+            if (cmd < EOS_FE310_MAX_CMD) {
+                cmd_handler[cmd](cmd, buffer, len);
+            } else {
+                bad_handler(cmd, buffer, len);
+            }
+
+            xSemaphoreTake(mutex, portMAX_DELAY);
+        } else {
+            ESP_LOGI(TAG, "FE310 RECV NULL");
+        }
+        // vTaskDelay(5000 / portTICK_PERIOD_MS);
+    }
+    xSemaphoreGive(mutex);
+}
+
+// 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) {
+    xSemaphoreGive(mutex);
+    WRITE_PERI_REG(GPIO_OUT_W1TS_REG, (1 << SPI_GPIO_CTS));
+}
+
+// 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) {
+    xSemaphoreTake(mutex, portMAX_DELAY);
+    WRITE_PERI_REG(GPIO_OUT_W1TC_REG, (1 << SPI_GPIO_CTS));
+}
+
+void eos_fe310_init(void) {
+    esp_err_t ret;
+    
+    // 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.pin_bit_mask = (1 << SPI_GPIO_CTS);
+    gpio_config(&io_conf);
+    WRITE_PERI_REG(GPIO_OUT_W1TC_REG, (1 << SPI_GPIO_CTS));
+
+    io_conf.intr_type = GPIO_INTR_DISABLE;
+    io_conf.mode = GPIO_MODE_OUTPUT;
+    io_conf.pin_bit_mask = (1 << SPI_GPIO_RTS);
+    gpio_config(&io_conf);
+    WRITE_PERI_REG(GPIO_OUT_W1TC_REG, (1 << SPI_GPIO_RTS));
+
+    //Configuration for the SPI bus
+    spi_bus_config_t buscfg = {
+        .mosi_io_num = SPI_GPIO_MOSI,
+        .miso_io_num = SPI_GPIO_MISO,
+        .sclk_io_num = SPI_GPIO_SCLK
+    };
+
+    //Configuration for the SPI slave interface
+    spi_slave_interface_config_t slvcfg = {
+        .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
+    };
+
+    //Enable pull-ups on SPI lines so we don't detect rogue pulses when no master is connected.
+    gpio_set_pull_mode(SPI_GPIO_MOSI, GPIO_PULLUP_ONLY);
+    gpio_set_pull_mode(SPI_GPIO_SCLK, GPIO_PULLUP_ONLY);
+    gpio_set_pull_mode(SPI_GPIO_CS, GPIO_PULLUP_ONLY);
+
+    int i;
+    for (i=0; i<EOS_FE310_MAX_CMD; i++) {
+        cmd_handler[i] = bad_handler;
+    }
+    
+    //Initialize SPI slave interface
+    ret=spi_slave_initialize(HSPI_HOST, &buscfg, &slvcfg, 1);
+    assert(ret==ESP_OK);
+
+    eos_msgq_init(&send_q, send_q_array, EOS_FE310_SIZE_Q);
+    mutex = xSemaphoreCreateMutex();
+    xTaskCreate(&worker, "fe310_receiver", 4096, NULL, 5, NULL);
+}
+
+int eos_fe310_send(unsigned char cmd, unsigned char *buffer, uint16_t len) {
+    xSemaphoreTake(mutex, portMAX_DELAY);
+    WRITE_PERI_REG(GPIO_OUT_W1TS_REG, (1 << SPI_GPIO_RTS));
+    int rv = eos_msgq_push(&send_q, cmd, buffer, len);
+    xSemaphoreGive(mutex);
+    
+    return rv;
+}
+
+void eos_fe310_set_handler(unsigned char cmd, eos_fe310_fptr_t handler) {
+    cmd_handler[cmd] = handler;
+}
+
-- 
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