mirror of
https://github.com/OpenEPaperLink/OpenEPaperLink.git
synced 2026-03-21 06:06:23 +01:00
183 lines
3.3 KiB
C
183 lines
3.3 KiB
C
#include <stdbool.h>
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#include "asmUtil.h"
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#include "printf.h"
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#include "flash.h"
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#include "cpu.h"
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#pragma callee_saves flashAddrCheck
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static uint8_t flashAddrCheck(uint32_t flashAddr, uint16_t len) __reentrant /* to save ram space */ // return 0xff for error, pgNo
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{
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uint16_t dstOfst;
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uint8_t pgNo;
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if (!len)
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return 0xff;
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//verify address
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if ((uint8_t)(flashAddr >> 24))
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return 0xff;
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switch ((uint8_t)(flashAddr >> 16)) {
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case 0x00:
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pgNo = ((uint8_t)(flashAddr >> 8)) >> 2;
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break;
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case 0x80:
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if (pgNo)
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return 0xff;
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pgNo = 0x80;
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break;
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default:
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return 0xff;
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}
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dstOfst = flashAddr & 0x3ff;
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//verify no boundary crossing
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if (((uint8_t)((dstOfst + len - 1) >> 8)) >> 2) //yeah...sdcc
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return 0xff;
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return pgNo;
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}
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//info page is "at" 0x10000
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#pragma callee_saves flashWrite
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__bit flashWrite(uint32_t dstAddr, const void __xdata *src, uint16_t len, __bit alsoErase /*whole page */)
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{
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uint8_t pgNo, cfgPg, speed;
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__bit irq;
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pgNo = flashAddrCheck(dstAddr, len);
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if (pgNo == 0xff)
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return false;
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irq = IEN_EA;
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IEN_EA = false;
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speed = CLKSPEED;
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CLKSPEED = 0x21; //flash ops only work at this speed
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cfgPg = CFGPAGE;
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CFGPAGE = 4;
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if (alsoErase)
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SETTINGS |= 0x38;
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else
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SETTINGS = 0x18;
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FWRTHREE = 3;
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FPGNO = pgNo;
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FWRDSTL = (uint8_t)dstAddr;
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FWRDSTH = (((uint16_t)dstAddr) >> 8) & 0x03;
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FWRLENL = (uint8_t)(len - 1);
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FWRLENH = (len - 1) >> 8;
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FWRSRCL = (uint8_t)src;
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FWRSRCH = ((uint16_t)src) >> 8;
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TRIGGER |= 8; //start
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while (!(TCON2 & 0x08)); //wait
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TCON2 &=~ 0x48;
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SETTINGS &=~ 0x10;
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CFGPAGE = cfgPg;
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CLKSPEED = speed;
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IEN_EA = irq;
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return true;
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}
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#pragma callee_saves flashRead
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__bit flashRead(uint32_t srcAddr, void __xdata *dst, uint16_t len)
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{
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uint8_t pgNo, cfgPg, speed;
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__bit irq;
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pgNo = flashAddrCheck(srcAddr, len);
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if (pgNo == 0xff)
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return false;
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irq = IEN_EA;
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IEN_EA = false;
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speed = CLKSPEED;
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CLKSPEED = 0x21; //flash ops only work at this speed
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cfgPg = CFGPAGE;
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CFGPAGE = 4;
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SETTINGS = 0x8;
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FWRTHREE = 3;
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FPGNO = pgNo;
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FWRDSTL = (uint8_t)dst;
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FWRDSTH = ((uint16_t)dst) >> 8;
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FWRSRCL = (uint8_t)srcAddr;
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FWRSRCH = (((uint16_t)srcAddr) >> 8) & 0x03;
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FWRLENL = (uint8_t)(len - 1);
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FWRLENH = (len - 1) >> 8;
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TRIGGER |= 8; //start
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while (!(TCON2 & 0x08)); //wait
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TCON2 &=~ 0x48;
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SETTINGS &=~ 0x10;
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CFGPAGE = cfgPg;
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CLKSPEED = speed;
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IEN_EA = irq;
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return true;
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}
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#pragma callee_saves flashErase
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__bit flashErase(uint32_t dstAddr)
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{
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uint8_t __xdata dummyByte = 0xff;
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uint8_t pgNo, cfgPg, speed;
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__bit irq;
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pgNo = flashAddrCheck(dstAddr, 1);
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if (pgNo == 0xff)
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return false;
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irq = IEN_EA;
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IEN_EA = false;
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speed = CLKSPEED;
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CLKSPEED = 0x21; //flash ops only work at this speed
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cfgPg = CFGPAGE;
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CFGPAGE = 4;
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//this command does an erase AND a write (erase of page, write up to a page at given offset and len)
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// i found no way to JUST erase. As len is encoded at "minus one", we cannot ask the hardware to write
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// zeor bytes, so we write one - a 0xFF dummy
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SETTINGS |= 0x38;
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FWRTHREE = 3;
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FPGNO = pgNo;
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FWRDSTL = 0;
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FWRDSTH = 0;
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FWRLENL = 0;
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FWRLENH = 0;
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FWRSRCL = (uint8_t)&dummyByte;
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FWRSRCH = ((uint16_t)&dummyByte) >> 8;
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TRIGGER |= 8; //start
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while (!(TCON2 & 0x08)); //wait
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TCON2 &=~ 0x48;
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SETTINGS &=~ 0x10;
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CFGPAGE = cfgPg;
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CLKSPEED = speed;
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IEN_EA = irq;
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return true;
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}
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