46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
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#include "string.h"
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#include "norflash.h"
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/// Enumerace povelů pro SPI FLASH.
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enum FLASH_COMMANDS : uint8_t {
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/* single byte commands */
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FLASH_WRDI = 0x04, // nepoužito
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FLASH_WREN = 0x06,
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FLASH_RDID = 0x9F,
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FLASHRSTEN = 0x66, // nepoužito
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FLASH__RST = 0x99, // nepoužito
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FLASH__RES = 0xAB, // release from power down, nepoužito
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FLASH__DPD = 0xB9, // power down, nepoužito
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// multi - byte
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FLASH_RDSR1 = 0x05,
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// dále se mohou povely lišit
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FLASH_RDSR2 = 0x35, // nepoužito
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FLASH_4READ = 0x03,
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FLASH_4PP = 0x02,
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FLASH_4SE = 0x20,
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};
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union FlashCommandHeader {
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struct {
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FLASH_COMMANDS cmd : 8;
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uint32_t adr : 24; // adresa je BIG ENDIEN - vyšší byte vystupuje po SPI dříve (MSB FIRST).
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}__attribute__((packed));
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uint8_t bytes [4];
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}__attribute__((packed));
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static inline uint32_t be_set_24 (const uint32_t p) {
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return ((p & 0x000000ff) << 16)
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| ((p & 0x0000ff00) << 0)
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| ((p & 0x00ff0000) >> 16);
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}
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/* Nic jiného zatím není potřeba, ale šlo by dodělat i zápis včetně mazání bloku.
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*/
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unsigned int NorFlash::ReadBlock(const unsigned int addr, uint8_t * data, const unsigned int len) {
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FlashCommandHeader header;
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header.cmd = FLASH_4READ;
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header.adr = be_set_24(addr);
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spi.ChipSelect(true);
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for (unsigned n=0u; n<sizeof(header); n++) spi.ReadWriteByte(header.bytes[n]);
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for (unsigned n=0u; n<len; n++) data [n] = spi.ReadWriteByte(0xff);
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spi.ChipSelect(false);
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return len;
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}
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