LPC1752读取FM25L04B的原理与实现

LPC1752通过SPI与FM25L04B进行通讯。

图 1 LPC1752 与 FM25L04B 硬件连线图

初始化LPC1752的SSP0模块按着如下步骤进行初始化的操作：

初始化代码：

void LPC17xx_SPI_Init(void){volatile uint32_t dummy;dummy = dummy;/* avoid warning */ LPC_SC);/* Enable power to SSPI0 block *//* PCLK_SSP0=CCLK */LPC_SC);/* PCLKSP0 = CCLK/4 (25MHz) */LPC_SC);/* PCLKSP0 = CCLK (100MHz) */LPC17xx_SPI_SetSpeed (SPI_SPEED_10MHz); LPC_GPIO0);/* P0.16 CS is output *//* P0.15 SCK, P0.17 MISO, P0.18 MOSI are SSP pins. */LPC_PINCON->PINSEL0 &= ~( (2UL<<30) );/* P0.15 cleared */LPC_PINCON) ) );/* P0.17, P0.18 cleared */LPC_PINCON->PINSEL0 |= ( (2UL<<30) );/* P0.15 SCK0 */LPC_PINCON) ) );/* P0.17 MISO0 P0.18 MOSI0 */LPC_SSP0);/* 8Bit, CPOL=0, CPHA=0*/LPC_SSP0);( LPC_SSP0->SR & ( 1 << SSPSR_BSY ) );SSPSR_RNE ) ){dummy = LPC_SSP0->DR;}}读取FM25L04B

FM25L04B的读时序uint8_t FM25L04B_Read(uint32_t Dst, uint8_t* RcvBufPt, uint32_t NByte){uint8_t addr_a8;uint32_t i = 0;// if ((Dst+NByte > MAX_ADDR)||(NByte == 0)) return (ERROR);addr_a8 = (Dst & 0xffffff00)>>5;SPI_FLASH_WP_UNLOCK(); SPI_FLASH_CS_LOW();FM25L04B_ReadWriteByte(READ_CMD|addr_a8);FM25L04B_ReadWriteByte(Dst & 0x00ff);for (i = 0; i < NByte; i++){RcvBufPt[i] = FM25L04B_ReadWriteByte(0xFF);} SPI_FLASH_CS_HIGH();SPI_FLASH_WP_LOCK();return 0;}写FM25L04B

FM25L04B的写时序uint8_t FM25L04B_Write(uint32_t Dst, uint8_t* SndbufPt,uint32_t NByte){uint8_t addr_a8;uint8_t temp = 0,StatRgVal = 0;uint32_t i = 0; addr_a8 = (Dst & 0xffffff00)>>5;SPI_FLASH_WP_UNLOCK();SPI_FLASH_CS_LOW();FM25L04B_ReadWriteByte(RDSR_CMD);temp = FM25L04B_ReadWriteByte(0xFF);SPI_FLASH_CS_HIGH();for(i = 0; i < NByte; i++){SPI_FLASH_CS_LOW();FM25L04B_ReadWriteByte(WREN_CMD);SPI_FLASH_CS_HIGH();SPI_FLASH_CS_LOW();FM25L04B_ReadWriteByte(WRITE_CMD|addr_a8);FM25L04B_ReadWriteByte((Dst+i)& 0x00ff);FM25L04B_ReadWriteByte(SndbufPt[i]);SPI_FLASH_CS_HIGH();do{SPI_FLASH_CS_LOW();FM25L04B_ReadWriteByte(RDSR_CMD);StatRgVal = FM25L04B_ReadWriteByte(0xFF);SPI_FLASH_CS_HIGH();}while (StatRgVal == 0x03 );}SPI_FLASH_CS_LOW();FM25L04B_ReadWriteByte(WREN_CMD);SPI_FLASH_CS_HIGH();SPI_FLASH_CS_LOW();FM25L04B_ReadWriteByte(WRSR_CMD);FM25L04B_ReadWriteByte(temp);SPI_FLASH_CS_HIGH();SPI_FLASH_WP_LOCK();return 0;}测试代码uint8_t Recv_buf[16];uint8_t Send_buf[16] = {0x01,0x02,0x05,0xe4};int main(void){SystemInit();LPC17xx_SPI_Init();FM25L04B_Read(0x0,Recv_buf, sizeof(Recv_buf));FM25L04B_Write(0x0,Send_buf, sizeof(Send_buf));memset(Recv_buf,0,sizeof(Recv_buf));FM25L04B_Read(0x0,Recv_buf, sizeof(Recv_buf));while(1) ;}

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