Posted on May 17, 2011 at 13:57Looking at the code in GPIO_PinRemapConfig() (stm32f10x_gpio.c file) you see
if((GPIO_Remap & 0x80000000) == 0x80000000)
{
AFIO->MAPR2 = tmpreg;
}
else
{
AFIO->MAPR = tmpreg;
}
Looking in stm32f10x_gpio.h you see a bunch of remap definitions for the GPIO_Remap argument but only these ones have the MSB set.
#define GPIO_Remap_TIM15 ((uint32_t)0x80000001) /*!< TIM15 Alternate Function mapping (only for Value line devices) */
#define GPIO_Remap_TIM16 ((uint32_t)0x80000002) /*!< TIM16 Alternate Function mapping (only for Value line devices) */
#define GPIO_Remap_TIM17 ((uint32_t)0x80000004) /*!< TIM17 Alternate Function mapping (only for Value line devices) */
#define GPIO_Remap_CEC ((uint32_t)0x80000008) /*!< CEC Alternate Function mapping (only for Value line devices) */
#define GPIO_Remap_TIM1_DMA ((uint32_t)0x80000010) /*!< TIM1 DMA requests mapping (only for Value line devices) */
#define GPIO_Remap_TIM9 ((uint32_t)0x80000020) /*!< TIM9 Alternate Function mapping (only for XL-density devices) */
#define GPIO_Remap_TIM10 ((uint32_t)0x80000040) /*!< TIM10 Alternate Function mapping (only for XL-density devices) */
#define GPIO_Remap_TIM11 ((uint32_t)0x80000080) /*!< TIM11 Alternate Function mapping (only for XL-density devices) */
#define GPIO_Remap_TIM13 ((uint32_t)0x80000100) /*!< TIM13 Alternate Function mapping (only for XL-density devices) */
#define GPIO_Remap_TIM14 ((uint32_t)0x80000200) /*!< TIM14 Alternate Function mapping (only for XL-density devices) */
#define GPIO_Remap_FSMC_NADV ((uint32_t)0x80000400) /*!< FSMC_NADV Alternate Function mapping (only for XL-density devices) */
This suggests that only the Value Line and XL families have the AFIO_MAPR2 register. Also the NAVD remap definition has the comment ''only for XL-density devices''.
