1 files changed, 108 insertions, 0 deletions
diff --git a/include/global.h b/include/global.h
new file mode 100644
index 0000000..4b93867
--- /dev/null
+++ b/include/global.h
@@ -0,0 +1,108 @@
+
+#ifndef __GLOBAL_H__
+#define __GLOBAL_H__
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <assert.h>
+#include <string.h>
+
+/* The IRQ header must be included before stm32_device.h since ST defines a bunch of messy macros there. */
+#include <stm32_irqs.h> /* Header generated from stm32***_startup.s in Makefile */
+
+#include <stm32f1xx.h>
+#include <core_cm3.h>
+
+#define DMA_ISR_FLAGS_Pos(channel) (4 * ((channel) - 1))
+#define DMA_ISR_FLAGS_CH(channel) (0xf << DMA_ISR_FLAGS_Pos(channel))
+
+#define COUNT_OF(x) ((sizeof(x)/sizeof(0[x])) / ((size_t)(!(sizeof(x) % sizeof(0[x])))))
+
+#define APB1_PRESC (1<<(APBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE1_Msk) >> RCC_CFGR_PPRE1_Pos]))
+#define AHB_PRESC  (1<<(AHBPrescTable[(RCC->CFGR & RCC_CFGR_HPRE_Msk) >> RCC_CFGR_HPRE_Pos]))
+
+#define AFRL(pin, val) ((val) << ((pin)*4))
+#define AFRH(pin, val) ((val) << (((pin)-8)*4))
+#define AF(pin) (2<<(2*(pin)))
+#define OUT(pin) (1<<(2*(pin)))
+#define IN(pin) (0)
+#define ANALOG(pin) (3<<(2*(pin)))
+#define CLEAR(pin) (3<<(2*(pin)))
+#define PULLUP(pin) (1<<(2*pin))
+#define PULLDOWN(pin) (2<<(2*pin))
+#define BSRR_CLEAR(pin) ((1<<pin)<<16)
+#define BSRR_SET(pin) (1<<pin)
+#define BSRR_VALUE(pin, value) ((((!(value))<<pin)<<16) | ((!!(value))<<pin))
+
+#ifndef SYSTICK_INTERVAL_US
+#define SYSTICK_INTERVAL_US 1000
+#endif /* SYSTICK_INTERVAL_US */
+
+
+enum ErrorCode {
+    ERR_SUCCESS = 0,
+    ERR_TIMEOUT,
+    ERR_PHYSICAL_LAYER,
+    ERR_FRAMING,
+    ERR_PROTOCOL,
+    ERR_DMA,
+    ERR_BUSY,
+    ERR_BUFFER_OVERFLOW,
+    ERR_RX_OVERRUN,
+    ERR_TX_OVERRUN,
+};
+
+typedef enum ErrorCode ErrorCode;
+
+enum board_config {
+    BCFG_UNCONFIGURED = 0,
+
+    /* The board assumes one of three configurations depending on connected periphery.
+     *
+     */
+
+    BCFG_DISPLAY,
+    /* When an I2C 1602 display is connected to the LCD connector on powerup, the board assumes its display
+     * configuration. In this configuration, the board scans the buttons connected on the Buttons connector and acts as
+     * a peripheral on the RS-485 bus, relaying information between the bus and the HCI peripherals. In addition to the
+     * LCD, the board controls three 8-digit 7-segment LED displays connected on the Buttons connector along with the
+     * buttons.
+     *
+     * RS-485 board address: BADDR_DISPLAY
+     */
+
+    BCFG_MOTOR,
+    /* When no LCD is connected and the BT0 input on the buttons connector is open, the board assumes its
+     * motor configuration. In this configuration, the board controls a motor connected through the Buttons and LCD
+     * connectors, and the USB control interface is enabled. The board acts as the host on the RS-485 bus. 
+     *
+     * RS-485 board address: BADDR_MOTOR
+     */
+
+    BCFG_MEAS,
+    /* When no LCD is connected and the BT0 input on the buttons connector is tied to ground, the board assumes its
+     * senesor configuration. In this configuration, the board periodically. The board acts as a peripheral on the
+     * RS-485 bus, relaying measurements on the bus when requested by the host. The board's bus address is set by pins
+     * BT1 and BT0 of the buttons connector. Both pins have pullups enabled, and will read zero when tied to ground on
+     * the connector. The address is the binary value of {BT2, BT1} added to BADDR_MES_BASE. With both pins open, the
+     * address is 11 (decimal), with BT1 tied to ground it is 10 (decimal).
+     *
+     * RS-485 board address: BADDR_MEAS_BASE + [BT2:1]
+     */
+};
+
+enum board_addr {
+    BADDR_DISPLAY = 1,
+    BADDR_MOTOR = 2,
+    BADDR_MEAS_BASE = 8,
+};
+
+void delay_us(int duration_us);
+uint64_t get_sync_time(void);
+
+extern enum board_config board_config;
+extern volatile uint64_t sys_time_us;
+extern volatile uint64_t sync_time_us;
+
+#endif /* __GLOBAL_H__ */