rtc example with tm1637 driver

[cortex-from-scratch] / drivers / tm1637.c

diff --git a/drivers/tm1637.c b/drivers/tm1637.c
index b6453ae..1d78f7a 100644 (file)
--- a/drivers/tm1637.c
+++ b/drivers/tm1637.c
@@ -84,7 +84,6 @@ void tm1637_reset() {
  * grid. Grid 1 an 2 have an additional dot that can be set */
 int set_grid(uint8_t offset, char value, bool dot) {
 
-       //int (*ack)() = ack_recv; /* Scary function pointer :D */
 
        if (offset > 3) {
                printf("Offset incorrect");
@@ -118,13 +117,21 @@ int set_grid(uint8_t offset, char value, bool dot) {
 
        tm1637_reset();
 
+
+       int (*ack)() = &ack_recv;
+        if ((((value >> 4) & 0xF) == 0xF ) && !(value & 0x08)) {
+               ack = &ack10_recv;
+       }
+       
        /* Write value to segments */
        start_condition();
        rwrite(I2C_DR, value);
-       if(!ack_recv())
-               return -1;
-       stop_condition(); 
+       if(!ack()) {
+       //      return -1;
+       }
 
+       stop_condition(); 
+       delay(); // wait for the chip to finish writing
        tm1637_reset();
 
        return 0;
@@ -145,27 +152,20 @@ int set_display(bool on, uint8_t degree) {
                return -1;
        }
        stop_condition();
-
        tm1637_reset();
 
        return 0;
-
 }
 
-
 void tm1637_example() {
 
-unsigned char display_number[10] = {0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, 0xFE, 0xF6};
-
-
+       unsigned char dn[10] = {0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, 0xFE, 0xF6};
        char love[4]  = { 0x1C, 0xFC, 0x7C, 0x9E };
-       
+               
        for (int i = 0; i < 4; i++) {
                set_grid(i, love[i], NODOT);
        }
 
-       set_display(true, 0);
-
 }
 
 /* HELPER ROUTINES */
@@ -207,6 +207,14 @@ int ack10_recv() {
 
 }
 
+/* Write delay chip */
+static void delay() {
+        int a = 0;
+        for (int i = 0; i < 500; i++)
+                a++;
+}
+
+
 /* Check if lines are idle (i.e. stop condition finished)*/
 int idle() {
        int cnt = 0;