1 files changed, 109 insertions, 0 deletions
diff --git a/crypto/gt22l16a1y.c b/crypto/gt22l16a1y.c
new file mode 100644
index 0000000..b997c36
--- /dev/null
+++ b/crypto/gt22l16a1y.c
@@ -0,0 +1,109 @@
+#include "project.h"
+
+#define SCLK   17
+#define MOSI   18
+#define NCS    19
+#define MISO   20
+
+#define READ 0x3
+#define FAST_READ 0xb
+
+
+static inline void d(void)
+{
+nrf_delay_us(1);
+}
+
+void
+gt_init (void)
+{
+  NRF_GPIO->PIN_CNF[SCLK] =
+    (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) |
+    (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
+    (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
+    (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos) |
+    (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+
+  NRF_GPIO->PIN_CNF[MOSI] =
+    (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) |
+    (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
+    (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
+    (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos) |
+    (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+
+
+  NRF_GPIO->PIN_CNF[NCS] =
+    (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) |
+    (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
+    (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
+    (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos) |
+    (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+
+
+
+  NRF_GPIO->PIN_CNF[MISO] =
+    (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) |
+    (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) |
+    (GPIO_PIN_CNF_PULL_Pulldown << GPIO_PIN_CNF_PULL_Pos) |
+    (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
+    (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
+
+
+  NRF_GPIO->DIRSET = (1 << MOSI) | (1 << NCS) | (1<<SCLK);
+  NRF_GPIO->DIRCLR = (1 << MISO);
+
+  NRF_GPIO->OUTSET = (1 << NCS) | (1<<MISO);
+}
+
+void gt_read(uint32_t a,uint8_t * buf,size_t len)
+{
+  uint32_t c;
+  uint8_t v;
+  
+  NRF_GPIO->OUTCLR = (1 << SCLK);
+  d();
+  NRF_GPIO->OUTCLR = (1 << NCS);
+  NRF_GPIO->OUTSET = (1 << NCS);
+  d();
+  
+ a |= READ << 24;
+
+ a=0x3000000;
+ a+=768+80;
+
+  for (c=0x80000000;c;c>>=1) {
+	if (c&a) 
+		  NRF_GPIO->OUTSET = (1 << MOSI);
+	else
+		  NRF_GPIO->OUTCLR = (1 << MOSI);
+  d();
+
+  NRF_GPIO->OUTSET = (1 << SCLK);
+  d();
+  NRF_GPIO->OUTCLR = (1 << SCLK);
+  d();
+  }
+
+  while (len--) {
+	v=0;
+	for (c=0x80;c;c>>=1) {
+	if (NRF_GPIO->IN & (1<<MISO)) v|=c;
+	
+
+
+  NRF_GPIO->OUTSET = (1 << SCLK);
+  d();
+  NRF_GPIO->OUTCLR = (1 << SCLK);
+  d();
+	}
+	*(buf++)=v;
+  }
+
+  d();
+	
+  NRF_GPIO->OUTSET = (1 << NCS);
+  d();
+	
+
+}
+