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发表于 2015-4-3 19:46:24
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用FSMC接口就行了。不过PB7上需要接74HC04反相器后才能与AS脚连接。
单片机：STM32F103VET6
[mw_shl_code=c,true]#include <stdio.h>
#include <stm32f10x.h>
#include <string.h>
typedef __packed struct
{
__IO uint8_t SEC;
__IO uint8_t SECALR;
__IO uint8_t MIN;
__IO uint8_t MINALR;
__IO uint8_t HOUR;
__IO uint8_t HOURALR;
__IO uint8_t DAY;
__IO uint8_t DATE;
__IO uint8_t MONTH;
__IO uint8_t YEAR;
__IO uint8_t CR1;
__IO uint8_t CR2;
__IO uint8_t CR3;
__IO uint8_t CR4;
__IO uint8_t RAM1[36]; // 0x0e-0x31
__IO uint8_t CENTURY;
__IO uint8_t RAM2[77]; // 0x33-0x7f
} DS12C887_TypeDef;
#define RTC2 ((DS12C887_TypeDef *)0x60000000)
// 延时n毫秒
void delay(uint16_t nms)
{
TIM_TimeBaseInitTypeDef tim;
TIM_TimeBaseStructInit(&tim);
tim.TIM_Period = 10 * nms - 1;
tim.TIM_Prescaler = 7199;
TIM_TimeBaseInit(TIM6, &tim);
TIM_ClearFlag(TIM6, TIM_FLAG_Update);
TIM_SelectOnePulseMode(TIM6, TIM_OPMode_Single);
TIM_Cmd(TIM6, ENABLE);
while (TIM_GetFlagStatus(TIM6, TIM_FLAG_Update) == RESET);
}
int fputc(int ch, FILE *fp)
{
if (fp == stdout)
{
if (ch == '\n')
{
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, '\r');
}
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, ch);
}
return ch;
}
int main(void)
{
FSMC_NORSRAMInitTypeDef fsmc;
FSMC_NORSRAMTimingInitTypeDef fsmc_timing;
GPIO_InitTypeDef gpio;
USART_InitTypeDef usart;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_USART1, ENABLE);
// PA8为RST复位引脚(默认输出低电平)
gpio.GPIO_Mode = GPIO_Mode_Out_PP;
gpio.GPIO_Pin = GPIO_Pin_8;
gpio.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &gpio);
// PA9为串口1发送引脚
gpio.GPIO_Mode = GPIO_Mode_AF_PP;
gpio.GPIO_Pin = GPIO_Pin_9;
gpio.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &gpio);
// PB7为NADV, 取反后送到AS引脚上, 该引脚不可用地址线代替
gpio.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &gpio);
// PD0~1为AD2~3, PD4为NOE接DS引脚, PD5为NWE接RW引脚, PD7为NE1片选引脚接CS, PD14~15为AD0~1
gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_7 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_Init(GPIOD, &gpio);
// PE7~10为AD4~7
gpio.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10;
GPIO_Init(GPIOE, &gpio);
// 初始化串口1
USART_StructInit(&usart);
usart.USART_BaudRate = 115200;
usart.USART_Mode = USART_Mode_Tx;
USART_Init(USART1, &usart);
USART_Cmd(USART1, ENABLE);
// FSMC的Bank1, Subbank1设为8位NOR Flash地址/数据线复用模式, 关闭NWAIT引脚
fsmc.FSMC_ReadWriteTimingStruct = &fsmc_timing;
fsmc.FSMC_WriteTimingStruct = &fsmc_timing;
FSMC_NORSRAMStructInit(&fsmc);
fsmc.FSMC_MemoryType = FSMC_MemoryType_NOR; // 存储器类型为NOR Flash
fsmc.FSMC_WaitSignal = FSMC_WaitSignal_Disable; // 不使用NWAIT引脚
fsmc_timing.FSMC_AddressHoldTime = 1;
fsmc_timing.FSMC_AddressSetupTime = 0;
fsmc_timing.FSMC_BusTurnAroundDuration = 0;
fsmc_timing.FSMC_DataSetupTime = 2; // HCLK=72MHz时, DATAST的最小值为2, 即3xHCLK clock cycles
FSMC_NORSRAMInit(&fsmc);
FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE); // 虽然Subbank1默认是启用的, 但执行FSMC_NORSRAMInit函数时会被关闭, 所以需要再次开启
printf("STM32F103VE FSMC DS12C887\n");
delay(200);
GPIO_WriteBit(GPIOA, GPIO_Pin_8, Bit_SET); // RESET=1, 撤销复位信号
// 读写自由SRAM区域
printf("General-purpose RAM1 addr: 0x%08x\n", (uint32_t)RTC2->RAM1);
printf("General-purpose RAM2 addr: 0x%08x\n", (uint32_t)RTC2->RAM2);
strcpy((char *)RTC2->RAM1, "Flexible static memory controller");
strcpy((char *)RTC2->RAM2, "Muxed mode - multiplexed asynchronous access to NOR Flash memory");
printf("str1=%s\n", RTC2->RAM1);
printf("str2=%s\n", RTC2->RAM2);
// 读A~D寄存器
printf("A=0x%02x B=0x%02x C=0x%02x D=0x%02x\n", RTC2->CR1, RTC2->CR2, RTC2->CR3, RTC2->CR4);
while (1)
__WFI();
}
void HardFault_Handler(void)
{
printf("Hard Error!\n");
while (1);
}[/mw_shl_code]
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楼主
发表于 2015-4-3 22:50:37
