varpa: initial public commit

1 files changed, 61 insertions, 0 deletions

diff --git a/firmware/src/driver/f1956.c b/firmware/src/driver/f1956.c
new file mode 100644
index 0000000..3af5fba
--- /dev/null
+++ b/firmware/src/driver/f1956.c
@@ -0,0 +1,61 @@
+/**
+ * 
+ * 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/f1956.h"
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+void att_init(uint8_t init_value)
+{
+    F1956_DEV_0_DDR |= (1 << F1956_DEV_0_SS);
+    F1956_DEV_0_PORT |= (1 << F1956_DEV_0_SS);
+
+    att_set(F1956_ID_INPUT_ATT, init_value);
+    _delay_ms(10);
+}
+
+void att_set(
+    uint8_t id,
+    uint8_t value
+)
+{
+    uint8_t dev_id = 0x0;
+    uint8_t dev_ss = 0x0;
+    uint8_t* dev_port = 0x0;
+    uint8_t cmd_buf[2] = {0x0, 0x0};
+
+    switch (id)
+    {
+        case F1956_ID_INPUT_ATT:
+            dev_id = F1956_DEV_INPUT_ATT;
+            break;
+    }
+
+    switch (dev_id)
+    {
+        case F1956_DEV_INPUT_ATT:
+            dev_ss = F1956_DEV_0_SS;
+            dev_port = (uint8_t*)&F1956_DEV_0_PORT;
+        break;
+    }
+
+    cmd_buf[0] = value & 0x7F;
+    cmd_buf[1] = F1956_DEV_INPUT_ATT_ADDR;
+
+    spi_start(cmd_buf, cmd_buf, sizeof(cmd_buf), dev_port, dev_ss);
+    spi_flush();
+}