/**
* @brief Read SPI flash memory.
* @param spi is the base address of SPI module.
* @param u32StartAddress is the start address.
* @param au8DataBuffer is the pointer of destination buffer.
* @param u32ByteCount is the total data count.
* @return None.
* @note Before calling this function, the transaction length (data width) must be configured as 8 bits.
*/
void SpiFlash_ReadData(SPI_T *spi, uint32_t u32StartAddress, uint8_t *au8DataBuffer, uint32_t u32ByteCount)
{
uint32_t u32RxCounter;
/* /CS: active */
SPI_SET_SS_LOW(spi);
/* Send command 0x03: Read data */
SPI_WRITE_TX0(spi, 0x03);
/* Trigger SPI transfer */
SPI_TRIGGER(spi);
/* Check busy state */
while(SPI_IS_BUSY(spi));
/* Send 24-bit start address */
/* Send the first 8 address bits */
SPI_WRITE_TX0(spi, (u32StartAddress >> 16) & 0xFF);
/* Trigger SPI transfer */
SPI_TRIGGER(spi);
/* Check busy state */
while(SPI_IS_BUSY(spi));
/* Send the second 8 address bits */
SPI_WRITE_TX0(spi, (u32StartAddress >> 8) & 0xFF);
/* Trigger SPI transfer */
SPI_TRIGGER(spi);
/* Check busy state */
while(SPI_IS_BUSY(spi));
/* Send the third 8 address bits */
SPI_WRITE_TX0(spi, u32StartAddress & 0xFF);
/* Trigger SPI transfer */
SPI_TRIGGER(spi);
/* Check busy state */
while(SPI_IS_BUSY(spi));
/* Reset RX data counter */
u32RxCounter = 0;
while(u32RxCounter < u32ByteCount)
{
/* Send SPI bus clock to get data from SPI flash */
SPI_WRITE_TX0(spi, 0x00);
/* Trigger SPI transfer */
SPI_TRIGGER(spi);
/* Check busy state */
while(SPI_IS_BUSY(spi));
/* Read data */
au8DataBuffer[u32RxCounter++] = SPI_READ_RX0(spi);
}
/* /CS: inactive */
SPI_SET_SS_HIGH(spi);
}
int spi_read_packet(SPI_T *spi, uint8_t *data, int len)
{
int timeout, i;
for(i=0; len != 0; i++, len--) {
timeout = SPI_TIMEOUT;
SPI_WRITE_TX0(spi, 0);
SPI_TRIGGER(spi);
while(SPI_IS_BUSY(spi)) {
if(!timeout--) {
printf("spi_read_packet timeout (len = %d)\n",len);
return(-1);
}
}
data[i] = SPI_READ_RX0(spi);
}
return(0);
}
