partially worked microdrill

SNIPPETS/eeprom_flash.c

@@ -0,0 +1,39 @@
+/**
+ * Change variable stored in FLASH
+ * !!! You can change only const values (non-constants are initializes on program start)
+ * @param addr - variable address
+ * @param new value
+ * @return 0 in case of error
+ */
+U8 change_progmem_value(U8 *addr, U8 val){
+    // unlock memory
+    FLASH_PUKR = EEPROM_KEY2;
+    FLASH_PUKR = EEPROM_KEY1;
+    // check bit PUL=1 in FLASH_IAPSR
+    if(!FLASH_IAPSR & 0x02)
+        return 0;
+    *addr = val;
+    // clear PUL to lock write
+    FLASH_IAPSR &= ~0x02;
+    return 1;
+}
+
+/**
+ * Change data in EEPROM
+ * @param addr - EEPROM address
+ * @param new value
+ * @return 0 in case of error
+ */
+U8 change_eeprom_value(U8 *addr, U8 val){
+    // unlock eeprom
+    FLASH_DUKR = EEPROM_KEY1;
+    FLASH_DUKR = EEPROM_KEY2;
+    // check bit DUL=1 in FLASH_IAPSR
+    if(!FLASH_IAPSR & 0x08)
+        return 0;
+    *addr = val;
+    // clear DUL to lock write
+    FLASH_IAPSR &= ~0x08;
+    return 1;
+}
+*/

SNIPPETS/uart.c

@@ -0,0 +1,11 @@
+// configure UART
+    PORT(UART_PORT, DDR) |= UART_TX_PIN; // output
+    PORT(UART_PORT, ODR) |= UART_TX_PIN; // torn off N push-down
+    // For open-drain output comment next line
+    PORT(UART_PORT, CR1) |= UART_TX_PIN; // push-pull
+    // 9 bit, no parity, 1 stop (UART_CR3 = 0 - reset value)
+    // 57600 on 16MHz: BRR1=0x11, BRR2=0x06
+    UART2_BRR1 = 0x11; UART2_BRR2 = 0x06;
+    // UART2_CR1  = UART_CR1_M; // M = 1 -- 9bits
+    // for several uarts on line don't write UART_CR2_TEN here, write it when need
+    UART2_CR2  = UART_CR2_TEN | UART_CR2_REN | UART_CR2_RIEN; // Allow Tx/RX, generate ints on rx

SNIPPETS/usefull_macros.h

@@ -0,0 +1,4 @@
+// macro for using in port constructions like PORT(LED_PORT, ODR) = xx
+#define CONCAT(a,b)     a##_##b
+#define PORT(a,b)       CONCAT(a,b)
+