varpa: initial public commit

1 files changed, 201 insertions, 0 deletions

diff --git a/firmware/src/driver/si4468.c b/firmware/src/driver/si4468.c
new file mode 100644
index 0000000..17dd77d
--- /dev/null
+++ b/firmware/src/driver/si4468.c
@@ -0,0 +1,201 @@
+/**
+ * 
+ * Author: Dylan Muller
+ * Copyright (c) 2025 
+ * All rights reserved.
+ * 
+ * - Commercial/IP use prohibited.
+ * - Attribution required.
+ * See License.txt
+ *
+ */
+
+#include "setup.h"
+
+#include "peripheral/spi.h"
+
+#include "driver/si4468.h"
+#include "driver/radio_config.h"
+#include "driver/device.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <util/atomic.h>
+#include <avr/pgmspace.h>
+
+
+static const uint8_t config[] PROGMEM = RADIO_CONFIGURATION_DATA_ARRAY;
+
+void si4468_init(void)
+{
+    SI4468_DEV_0_DDR |= (1 << SI4468_DEV_0_SS);
+    SI4468_DEV_0_PORT |= (1 << SI4468_DEV_0_SS);
+}
+
+void si44468_get_device(
+    int id,
+    t_dev* device
+)
+{
+    uint8_t dev_id = 0x0;
+    uint8_t dev_ss = 0x0;
+    uint8_t* dev_port = 0x0;
+
+    device->dev_id = 0;
+    device->dev_ss = 0;
+    device->dev_port = 0;
+
+     switch (id)
+        {
+            case SI4468_ID_RADIO:
+                dev_id = SI4468_DEV_RADIO;
+                break;
+        }
+
+        switch (dev_id)
+        {
+            case SI4468_DEV_RADIO:
+                dev_ss = SI4468_DEV_0_SS;
+                dev_port = (uint8_t*)&SI4468_DEV_0_PORT;
+            break;
+        }
+
+    device->dev_id = dev_id;
+    device->dev_ss = dev_ss;
+    device->dev_port = dev_port;
+}
+
+static uint8_t si4468_get_response(
+    void* buf,
+    uint8_t len
+)
+{
+    t_dev device;
+    uint8_t cts = 0x0;
+    uint8_t* cmd_buf = 0x0;
+    uint16_t cmd_size = 0x0;
+    uint8_t i = 0;
+
+    si44468_get_device(SI4468_ID_RADIO, &device);
+
+    cmd_size = len + SI4468_GET_RESP_LEN;
+    cmd_buf = (uint8_t*)malloc((cmd_size));
+
+    cmd_buf[0] = SI4468_CMD_READ_CMD_BUFF;
+    cmd_buf[1] = SI4468_CTS;
+
+    spi_start(cmd_buf, cmd_buf, SI4468_GET_RESP_LEN,  device.dev_port, device.dev_ss);
+    spi_flush();
+
+    cts = (cmd_buf[0] == SI4468_CTS);
+
+    if(cts)
+    {
+        if (len > 0)
+        {
+            for(i = 0x0; i < cmd_size; i++)
+            {
+                cmd_buf[i] = SI4468_CTS;
+            }
+
+            cmd_buf[0] = SI4468_CMD_READ_CMD_BUFF;
+
+            spi_start(cmd_buf, cmd_buf, cmd_size, (uint8_t*)&SI4468_DEV_0_PORT,  SI4468_DEV_0_SS);
+            spi_flush();
+
+            for(i = SI4468_GET_RESP_LEN; i < cmd_size; i++)
+            {
+                ((uint8_t*)buf)[i - SI4468_GET_RESP_LEN] = cmd_buf[i];
+            }
+
+        }
+    }
+
+    free(cmd_buf);
+
+    return cts;
+}
+
+static uint8_t si4468_wait_for_response(
+    void* buf,
+    uint8_t buf_len
+)
+{
+    while(!si4468_get_response(buf, buf_len))
+    {
+        _delay_ms(10);
+    }
+
+    return 1;
+}
+
+static void si4468_exec_api(
+    void* in, 
+    size_t in_len,
+    void* out,
+    uint8_t out_len
+)
+{
+    t_dev device;
+    si44468_get_device(SI4468_ID_RADIO, &device);
+
+    if (si4468_wait_for_response(0, 0))
+    {
+        spi_start(in, 0, in_len, device.dev_port,  device.dev_ss);
+        spi_flush();
+
+        if (out != 0)
+        {
+            si4468_wait_for_response(out, out_len);
+        }
+    }
+}
+
+void si4468_apply_startup_config(void)
+{
+    uint16_t i = 0;
+    uint8_t buf[100];
+
+    for(i = 0; i < sizeof(config); i++)
+    {
+        memcpy_P(buf, &config[i], sizeof(buf));
+        uint8_t tmp = buf[0];
+        si4468_exec_api(&buf[1], tmp, 0, 0);
+        i += tmp;
+    }
+}
+
+void si4468_get_info(
+    si4468_info_t* info
+)
+{
+    uint8_t data[8] = {
+		SI4468_CMD_PART_INFO
+	};
+
+    si4468_exec_api(data, 1, data, 8);
+
+	info->chipRev	= data[0];
+	info->part		= (data[1]<<8) | data[2];
+	info->partBuild	= data[3];
+	info->id		= (data[4]<<8) | data[5];
+	info->customer	= data[6];
+	info->romId		= data[7];
+}
+
+void si4468_tx_mode(void)
+{
+    uint8_t packet[] = {SI4468_CMD_START_TX, 0,0,0, 0,0,0 };
+    si4468_exec_api(packet, sizeof(packet), 0, 0);
+}
+
+void si4468_rx_mode(void)
+{
+    uint8_t packet[] = {SI4468_CMD_CHANGE_STATE, 0x3};
+    si4468_exec_api(packet, sizeof(packet), 0, 0);
+}