add driver

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]);
+    }
+}