Posted on May 17, 2011 at 13:49With own risk!!!!
void fram_write(uint16_t address, uint8_t* buffer, uint32_t length)
{
DMA_InitTypeDef DMA_InitStructure;
if(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) == SET)
{
i2c_bus_reset();
}
/* Care! Other FRAM Memory Sizes use different addressing (1 byte or 2 byte etc.)*/
//((((uint8_t*) &address)[2] << 1) | I2C2_SLAVE_ADDRESS7);
fram_slave_Address = I2C2_SLAVE_ADDRESS7;
fram_RW_DataBuffer[0] = ((uint8_t*) &address)[1];
fram_RW_DataBuffer[1] = ((uint8_t*) &address)[0];
if(length > 0)
{
/* The first 2 bytes are address bytes msb first */
memcpy(&fram_RW_DataBuffer[2], buffer, length);
}
iic_direction = IIC_DIRECTION_TRANSMITTER;
I2C_AcknowledgeConfig(I2C1, DISABLE);
DMA_DeInit(DMA1_Channel6);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)I2C1_DR_Address;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)fram_RW_DataBuffer;
DMA_InitStructure.DMA_BufferSize = length + 2;
DMA_Init(DMA1_Channel6, &DMA_InitStructure);
I2C_DMACmd(I2C1, ENABLE);
DMA_ITConfig(DMA1_Channel6, DMA_IT_TC, ENABLE);
I2C_ITConfig(I2C1, I2C_IT_EVT, ENABLE);
I2C_GenerateSTART(I2C1, ENABLE);
fram_wait_ready();
}
void fram_read(uint16_t address, uint8_t* buffer, uint32_t length)
{
DMA_InitTypeDef DMA_InitStructure;
fram_write(address, NULL, 0);
iic_direction = IIC_DIRECTION_RECEIVER;
DMA_DeInit(DMA1_Channel7);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)I2C1_DR_Address;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)fram_RW_DataBuffer;
DMA_InitStructure.DMA_BufferSize = length;
DMA_Init(DMA1_Channel7, &DMA_InitStructure);
I2C_ITConfig(I2C1, I2C_IT_EVT, ENABLE);
/* Set Last bit to have a NACK on the last received byte */
I2C_DMALastTransferCmd(I2C1, ENABLE);
I2C_DMACmd(I2C1, ENABLE);
/* Enable the DMA Channel7 Transfer Complete IT */
DMA_ITConfig(DMA1_Channel7, DMA_IT_TC, ENABLE);
I2C_AcknowledgeConfig(I2C1, ENABLE);
/* Generate the START */
I2C_GenerateSTART(I2C1, ENABLE);
fram_wait_ready();
memcpy(buffer, fram_RW_DataBuffer, length);
}
