Posted on June 03, 2015 at 09:42
Hello dear members of forum,
I would like to use a FM24C256 ram of RAMTRON (
http://www.kosmodrom.com.ua/data/memory/FM24C256ds_r3.1.pdf
). I have tryed to write program for it but It do not work. When I write it the program to stop at the red line. Please help me. I am waiting for your advise.
My program is:
#define FM_SCK GPIO_Pin_10
#define FM_SDA GPIO_Pin_11
#define FM_SCKPS GPIO_PinSource10
#define FM_SDAPS GPIO_PinSource11
#define FM_GAF GPIO_AF_1
#define FM_GPIO GPIOB
#define FM_I2C I2C2
#define DS_ADDR (0x68<<
1
)
#define I2C_CLK 1000000
#define FRAM_ADDR_WR 0xA0
#define FRAM_ADDR_RD 0xA1
#define FRAM_SIZE 32768
#define I2C_WR_ACK 0 // ACK state when writing
#define I2C_RD_NAK 0 // CCS value to NAK on read
#define I2C_RD_ACK 1 // CCS value to ACK on read
extern void fram_init(void);
extern uint8_t I2C_FMWrReg(uint16_t Reg, uint8_t data);
uint8_t I2C_FMRdReg(uint16_t start_addr);
void fram_init(void)
{
GPIO_InitTypeDef G;
I2C_InitTypeDef I;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
G.GPIO_Pin
=
FM_SDA
| FM_SCK;
G.GPIO_OType
=
GPIO_OType_OD
;
G.GPIO_PuPd
=
GPIO_PuPd_UP
;
G.GPIO_Speed
=
GPIO_Speed_Level_1
;
G.GPIO_Mode
=
GPIO_Mode_AF
;
GPIO_Init(FM_GPIO, &G);
GPIO_PinAFConfig(FM_GPIO, FM_SDAPS, FM_GAF);
GPIO_PinAFConfig(FM_GPIO, FM_SCKPS, FM_GAF);
I.I2C_Ack
=
I2C_Ack_Enable
;
I.I2C_AcknowledgedAddress
=
0x00
;
I.I2C_AnalogFilter
=
I2C_AnalogFilter_Enable
;
I.I2C_DigitalFilter
=
0x00
;
I.I2C_Mode
=
I2C_Mode_I2C
;
I.I2C_OwnAddress1
=
0x01
;
I.I2C_Timing
=
0x10805F87
;
I2C_Init(FM_I2C, &I);
I2C_Cmd(FM_I2C, ENABLE);
}
uint8_t I2C_FMWrReg(uint16_t start_addr, uint8_t data){
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_BUSY) == SET); // to controll busy
I2C_TransferHandling(FM_I2C, FRAM_ADDR_WR, 1, I2C_Reload_Mode, I2C_Generate_Start_Write); // to send start bit and wait for setting
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_TXIS) == RESET);
I2C_SendData(FM_I2C, start_addr>>8); // to send address HIGH
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_TCR) == RESET);
I2C_TransferHandling(FM_I2C, DS_ADDR, 1, I2C_AutoEnd_Mode, I2C_No_StartStop); // to send acknowledment bit
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_TXIS) == RESET);
I2C_SendData(FM_I2C, start_addr); // to send address LOW
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_TCR) == RESET);
I2C_TransferHandling(FM_I2C, DS_ADDR, 1, I2C_AutoEnd_Mode, I2C_No_StartStop); // to send acknowledment bit
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_TXIS) == RESET);
I2C_SendData(FM_I2C, data); // to send data
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_STOPF) == RESET);
I2C_ClearFlag(FM_I2C, I2C_FLAG_STOPF); // to send end bit
}
uint8_t I2C_FMRdReg(uint16_t start_addr){
uint8_t data;
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_BUSY) == SET);
I2C_TransferHandling(FM_I2C, FRAM_ADDR_WR, 1, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_TXIS) == RESET);
I2C_SendData(FM_I2C, start_addr>>8);
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_TC) == RESET);
I2C_TransferHandling(FM_I2C, FRAM_ADDR_WR, 1, I2C_AutoEnd_Mode, I2C_Generate_Start_Read);
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_RXNE) == RESET);
I2C_SendData(FM_I2C, start_addr);
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_TC) == RESET);
I2C_TransferHandling(FM_I2C, FRAM_ADDR_WR, 1, I2C_AutoEnd_Mode, I2C_Generate_Start_Read);
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_RXNE) == RESET);
data = I2C_ReceiveData(FM_I2C);
while(I2C_GetFlagStatus(FM_I2C, I2C_FLAG_STOPF) == RESET);
I2C_ClearFlag(FM_I2C, I2C_FLAG_STOPF);
return data;
}
