From 8e9d459345ea2b33041b8370defadc8385288b89 Mon Sep 17 00:00:00 2001
From: Blitblank <pmcgeee03@gmail.com>
Date: Sun, 7 Dec 2025 18:20:08 -0600
Subject: [PATCH] add driver

---
 src/SsdInterface.cpp |  0
 src/SsdInterface.hpp | 21 +++++++++++++++++++++
 src/drivers/ssd.c    | 34 ++++++++++++++++++++++++++++++++++
 src/drivers/ssd.h    | 37 +++++++++++++++++++++++++++++++++++++
 4 files changed, 92 insertions(+)
 create mode 100644 src/SsdInterface.cpp
 create mode 100644 src/SsdInterface.hpp
 create mode 100644 src/drivers/ssd.c
 create mode 100644 src/drivers/ssd.h

diff --git a/src/SsdInterface.cpp b/src/SsdInterface.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/SsdInterface.hpp b/src/SsdInterface.hpp
new file mode 100644
index 0000000..f7e690f
--- /dev/null
+++ b/src/SsdInterface.hpp
@@ -0,0 +1,21 @@
+
+#pragma once
+
+#include "drivers/ssd.h"
+#include "stdint.h"
+
+class SsdInterface {
+
+public:
+
+    SsdInterface();
+    ~SsdInterface() = default;
+
+    uint32_t write(int32_t value, bool hex); // hex=false => decimal 
+    uint32_t write(int32_t value, uint32_t decimal);
+
+private:
+
+
+
+};
diff --git a/src/drivers/ssd.c b/src/drivers/ssd.c
new file mode 100644
index 0000000..079126a
--- /dev/null
+++ b/src/drivers/ssd.c
@@ -0,0 +1,34 @@
+
+#include "ssd.h"
+
+void shiftInit(const ssd_595_t* device) {
+    gpio_config_t ioConfig = {
+        .mode = GPIO_MODE_OUTPUT,
+        .pin_bit_mask = (1ULL << device->dataPin)  |
+                        (1ULL << device->clockPin) |
+                        (1ULL << device->latchPin)
+    };
+    gpio_config(&ioConfig);
+
+    gpio_set_level(device->dataPin, 0);
+    gpio_set_level(device->clockPin, 0);
+    gpio_set_level(device->latchPin, 0);
+}
+
+void addDecimal(uint8_t* data) {
+    data = (*data | 0x01);
+}
+
+void shiftByte(const ssd_595_t* device, uint8_t byte) {
+    for(int i = 0; i < __CHAR_BIT__; i++) {
+        gpio_set_level(device->dataPin, (byte >> i) & 0x1);
+        pulse(device->clockPin);
+    }
+    pulse(device->latchPin);
+}
+
+void shiftBytes(const ssd_595_t* device, uint8_t* bytes, size_t numBytes) {
+    for(size_t i = 0; i < numBytes; i++) {
+        shiftByte(device, bytes[i]);
+    }
+}
\ No newline at end of file
diff --git a/src/drivers/ssd.h b/src/drivers/ssd.h
new file mode 100644
index 0000000..f553084
--- /dev/null
+++ b/src/drivers/ssd.h
@@ -0,0 +1,37 @@
+
+#include <stdint.h>
+#include "driver/gpio.h"
+
+typedef struct {
+    gpio_num_t dataPin;
+    gpio_num_t clockPin;
+    gpio_num_t latchPin;
+} ssd_595_t;
+
+uint8_t map[17] = { // encoding of digits on the seven segment display
+    0xFC, // 0
+    0x60, // 1
+    0xDA, // 2
+    0xF2, // 3
+    0x66, // 4
+    0xB6, // 5
+    0xBE, // 6
+    0xE0, // 7
+    0xFE, // 8
+    0xF6, // 9
+    0xEE, // A
+    0x3E, // B
+    0x9C, // C
+    0x7A, // D
+    0x9E, // E
+    0x8E, // F
+    0x02, // -
+};
+
+void shiftInit(const ssd_595_t* device);
+
+void addDecimal(uint8_t* data); // adds a decimal to a single digit
+
+void shiftByte(const ssd_595_t* device, uint8_t byte); // outputs a serial byte, big-endian
+void shiftBytes(const ssd_595_t* device, uint8_t* bytes, size_t numBytes); // outputs multiple bytes
+