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bcm2835.h
executable file
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bcm2835.h
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#define PAGESIZE 4096
#define BLOCK_SIZE 4096
#define IOBASE 0x20000000
#define GPIO_BASE (IOBASE + 0x200000)
#define BSC0_BASE (IOBASE + 0x205000)
#define TIMER_ARM_BASE (IOBASE + 0x00B000)
/*
* Defines for ARM Timer peripheral
*/
#define TIMER_ARM_LOAD *(timer_arm.addr + 0x100)
#define TIMER_ARM_VALUE *(timer_arm.addr + 0x101)
#define TIMER_ARM_CONTROL *(timer_arm.addr + 0x102)
#define TIMER_ARM_IRQ_CLEAR *(timer_arm.addr + 0x103)
#define TIMER_ARM_IRQ_RAW *(timer_arm.addr + 0x104)
#define TIMER_ARM_IRQ_MASK *(timer_arm.addr + 0x105)
#define TIMER_ARM_RELOAD *(timer_arm.addr + 0x106)
#define TIMER_ARM_PREDIVIDE *(timer_arm.addr + 0x107)
#define TIMER_ARM_COUNT *(timer_arm.addr + 0x108)
// Zero-shifts are here for code readability, where a zero-bit holds significant
// meaning other than just a negated state, or where the negated state is notable.
#define TIMER_ARM_C_16BIT (0 << 1)
#define TIMER_ARM_C_23BIT (1 << 1)
#define TIMER_ARM_C_PS1 (0 << 2)
#define TIMER_ARM_C_PS16 (1 << 2)
#define TIMER_ARM_C_PS256 (2 << 2)
#define TIMER_ARM_C_PS1_1 (3 << 2)
#define TIMER_ARM_C_INTEN (1 << 5)
#define TIMER_ARM_C_DISABLE (0 << 7)
#define TIMER_ARM_C_ENABLE (1 << 7)
#define TIMER_ARM_C_DBGHALT (1 << 8)
#define TIMER_ARM_C_FREE_EN (1 << 9)
#define TIMER_ARM_C_FPS(n) ((n & 0xff) << 16)
#define TIMER_ARM_C_FPS_MASK (0xff << 16)
/*
* Defines for I2C peripheral (aka BSC, or Broadcom Serial Controller)
*/
#define BSC0_C *(bsc0.addr + 0x00)
#define BSC0_S *(bsc0.addr + 0x01)
#define BSC0_DLEN *(bsc0.addr + 0x02)
#define BSC0_A *(bsc0.addr + 0x03)
#define BSC0_FIFO *(bsc0.addr + 0x04)
#define BSC_C_I2CEN (1 << 15)
#define BSC_C_INTR (1 << 10)
#define BSC_C_INTT (1 << 9)
#define BSC_C_INTD (1 << 8)
#define BSC_C_ST (1 << 7)
#define BSC_C_CLEAR (1 << 4)
#define BSC_C_READ 1
#define START_READ BSC_C_I2CEN|BSC_C_ST|BSC_C_CLEAR|BSC_C_READ
#define START_WRITE BSC_C_I2CEN|BSC_C_ST
#define BSC_S_CLKT (1 << 9)
#define BSC_S_ERR (1 << 8)
#define BSC_S_RXF (1 << 7)
#define BSC_S_TXE (1 << 6)
#define BSC_S_RXD (1 << 5)
#define BSC_S_TXD (1 << 4)
#define BSC_S_RXR (1 << 3)
#define BSC_S_TXW (1 << 2)
#define BSC_S_DONE (1 << 1)
#define BSC_S_TA 1
#define CLEAR_STATUS BSC_S_CLKT|BSC_S_ERR|BSC_S_DONE
struct bcm2835_peripheral {
unsigned long addr_p; // Physical address
unsigned long init_count;
int mem_fd; // File Descriptor for /dev/mem
void *map; // The mmap()
volatile unsigned int *addr;
};
extern struct bcm2835_peripheral gpio;
extern struct bcm2835_peripheral bsc0;
extern struct bcm2835_peripheral timer_arm;
extern void wait_i2c_done();
extern void i2c_read(char dev_addr, char reg_addr, char *buf, unsigned short len);
extern void i2c_write(char dev_addr, char reg_addr, char *buf, unsigned short len);
extern void dump_bsc_status();
extern int map_peripheral(struct bcm2835_peripheral *p);
extern void unmap_peripheral(struct bcm2835_peripheral *p);