static int AT45D_ReadSector(uint16_t sector)
{
// printf("AT45D_ReadSector(%u)\r\n", sector);
#ifdef SPI_VERBOSE
while (IsBusy) {
printf(".");
}
printf("\r\n");
while (SPI2STATbits.SPIRBF) {
int result = SPI2BUF; // dummy read of the SPIBUF register to clear the SPIRBF flag
printf("AT45D_ReadSector discarding %x\r\n", result);
}
if (SPI2STATbits.SPIROV) {
printf("AT45D_ReadSector SPI2STAT = %x\r\n", SPI2STAT);
SPI2STATbits.SPIROV = 0;
}
while (!(ReadDFStatus() & 0x80)) {
printf("#");
}
#else
while (IsBusy);
while (!(ReadDFStatus() & 0x80)); // monitor the status register, wait until busy-flag is high
#endif
IsBusy = 1;
DF_reset(); // reset dataflash command decoder
DF_SPI_RW(FlashPageRead); // transfer to buffer 1 op-code
DF_SPI_RW((uint8_t)(sector >> (16 - PAGE_BITS))); // upper part of page address
DF_SPI_RW((uint8_t)(sector << (PAGE_BITS - 8))); // lower part of page address
DF_SPI_RW(0x00); // page starting address (lower 8 bits)
DF_SPI_RW(0x00); // don't cares
DF_SPI_RW(0x00); // don't cares
DF_SPI_RW(0x00); // don't cares
DF_SPI_RW(0x00); // don't cares
// DF_SPI_RW(0x00); // why is this required - odd...
DMA1CONbits.NULLW = 1;
DMA1CONbits.CHEN = 1; // enable DMA Channel
SPI2BUF = 0; // start the DMA transaction
// DMA1REQbits.FORCE = 1;
return 1;
}
void PageErase(uint16_t PageAdr)
{
DF_reset(); // reset dataflash command decoder
DF_SPI_RW(PageEraseCmd); // Page erase op-code
DF_SPI_RW((uint8_t)(PageAdr >> 7)); // upper part of page address
DF_SPI_RW((uint8_t)(PageAdr << 1)); // lower part of page address and MSB of int.page adr.
DF_SPI_RW(0x00); // dont cares
DF_reset(); // initiate flash page erase
while (!(ReadDFStatus() & 0x80)); // monitor the status register, wait until busy-flag is high
}
static void PageToBuffer(uint16_t PageAdr, uint8_t BufferNo)
{
// printf("PageToBuffer(PageAdr %u, BufferNo %u)\r\n", PageAdr, BufferNo);
DF_reset(); // reset dataflash command decoder
// Note that this test selects either Buffer 1 or the other buffer, whatever you call it.
// You can call it Buffer 0 or Buffer 2 and it will work as long as you are consistant.
// No matter what, a buffer will be selected.
if (BufferNo == 1) // transfer flash page to buffer 1
DF_SPI_RW(FlashToBuf1Transfer); // transfer to buffer 1 op-code
else
DF_SPI_RW(FlashToBuf2Transfer); // transfer to buffer 2 op-code
DF_SPI_RW((uint8_t)(PageAdr >> (16 - PAGE_BITS))); // upper part of page address
DF_SPI_RW((uint8_t)(PageAdr << (PAGE_BITS - 8))); // lower part of page address
DF_SPI_RW(0x00); // don't cares
DF_reset(); // init transfer
while(!(ReadDFStatus() & 0x80)); // monitor the status register, wait until busy-flag is high
}
static void BufferToPage(uint8_t BufferNo, uint16_t PageAdr)
{
// printf("BufferToPage(BufferNo %u, PageAdr %u)\r\n", BufferNo, PageAdr);
DF_reset(); // reset dataflash command decoder
// Note that this test selects either Buffer 1 or the other buffer, whatever you call it.
// You can call it Buffer 0 or Buffer 2 and it will work as long as you are consistant.
// No matter what, a buffer will be selected.
if (1 == BufferNo) // program flash page from buffer 1
DF_SPI_RW(Buf1ToFlashWE); // buffer 1 to flash with erase op-code
else
DF_SPI_RW(Buf2ToFlashWE); // buffer 2 to flash with erase op-code
DF_SPI_RW((uint8_t)(PageAdr >> (16 - PAGE_BITS))); //upper part of page address
DF_SPI_RW((uint8_t)(PageAdr << (PAGE_BITS - 8))); //lower part of page address
DF_SPI_RW(0x00); // don't cares
DF_reset(); // initiate flash page programming
while (!(ReadDFStatus() & 0x80)); // monitor the status register, wait until busy-flag is high
}
