Posted on May 17, 2011 at 13:25#define PERIPH_BB_BASE ((uint32_t)0x42000000)
#define PERIPH_BASE ((uint32_t)0x40000000)
#define APB1PERIPH_BASE PERIPH_BASE
#define APB2PERIPH_BASE (PERIPH_BASE + 0x10000)
#define AHBPERIPH_BASE (PERIPH_BASE + 0x20000)
#define GPIOA_BASE (APB2PERIPH_BASE + 0x0800)
#define GPIOB_BASE (APB2PERIPH_BASE + 0x0C00)
#define GPIOC_BASE (APB2PERIPH_BASE + 0x1000)
#define GPIOD_BASE (APB2PERIPH_BASE + 0x1400)
#define GPIOE_BASE (APB2PERIPH_BASE + 0x1800)
#define GPIOF_BASE (APB2PERIPH_BASE + 0x1C00)
#define GPIOG_BASE (APB2PERIPH_BASE + 0x2000)
#define GPIO_IDR_OFF (0x08) // Input Data register offset
// For example GPIO PA.05
#define GPIO_BASE GPIOA_BASE
#define GPIO_BIT 5
u32 *BitBandAddr;
BitBandAddr = (u32 *)(PERIPH_BB_BASE + (((GPIO_BASE - PERIPH_BASE) + GPIO_IDR_OFF) * 32) + (GPIO_BIT * 4));
if (*BitBandAddr)
puts(''Bit High'');
else
puts(''Bit Low'');
The address of PA.05 should be 0x42210114 if my math is correct.
-Clive
