根据经验，FSMC不难操作。下面给出一些代码，代码可用于ST的官方评估板STM3210E-EVAL，仅供参考：
// Note: NOR /CS is CE1 - Bank 1 of 0~3
#define EVAL_NOR_BASE ((u32)(0x60000000 | 0x04000000))
#define EVAL_NOR ((EVAL_NOR_TypeDef *) EVAL_NOR_BASE)
//...
//-----------------------------------------------------------------
// NOR(M29W128, /CS1-of 0~3) initialization
//-----------------------------------------------------------------
void NOR_Test_Init(void)
{
// NOR IO configuration --------------------------------------//
// Enable FSMC, GPIOD~G & AFEN(Alternate Function) clock //
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE |
RCC_APB2Periph_GPIOF | RCC_APB2Periph_GPIOG |
RCC_APB2Periph_AFIO, ENABLE);
// Set PD0,1, 4~5, 8~15 as PP AF - D2,3, OE,WE, D13~15, A16~18, D0~1
//...
// Set PE3~6, 7~15 as PP AF - A19~22, D4~12
//...
// Set PF0~5, 12~15 as PP AF - A0~5, A6~9
//...
// Set PG0~5, 9 as PP AF - A10~15, CE1
//...
// NOR configuration ------------------------------------------//
// NOR configured as follow:
// - Data/Address MUX = Disable
// - Memory Type = NOR
// - Data Width = 16bit
// - Reset Pin Level = High (needed for Flash memory)
// - Wait Signal Polarity = Low
// - Write Operation = Enable
// - Extended Mode = Disable
// - Asynchronous Wait = Disable
// for test purpose only
// FSMC_Bank1->BTCR[2] = FSMC_DataAddressMux_Disable | FSMC_MemoryType_SRAM |
// FSMC_MemoryDataWidth_16b | FSMC_WaitSignalPolarity_Low |
// FSMC_WriteOperation_Enable |
// FSMC_ExtendedMode_Disable | FSMC_AsyncWait_Disable;
FSMC_Bank1->BTCR[2] = FSMC_DataAddressMux_Disable | FSMC_MemoryType_NOR |
FSMC_MemoryDataWidth_16b | FSMC_FlashResetPinLevel_High |
FSMC_WaitSignalPolarity_Low | FSMC_WriteOperation_Enable |
FSMC_ExtendedMode_Disable | FSMC_AsyncWait_Disable;
// and as follow (NOR cycle time is <= 80ns):
// - Address Setup Time = 0x03
// - Address Hold Time = 0x00
// - Data Setup Time = 0x04
// - Bus Turn around Duration = 0x05
FSMC_Bank1->BTCR[3] = 0x00050403;
// - BANK 1 (of NOR/SRAM Bank 0~3) is enabled
FSMC_Bank1->BTCR[2] |= 0x0001;
}
随后就可以对 NOR 进行读写了：
//-----------------------------------------------------------------
// NOR(M29W128) test
// return NOR_TEST_FAIL_xx - Fail
// return NOR_TEST_PASS - PASS
//-----------------------------------------------------------------
u8 NOR_Test(u32 address)
{
//...
}
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