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https://github.com/RfidResearchGroup/ChameleonMini.git
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226 lines
8.0 KiB
ArmAsm
226 lines
8.0 KiB
ArmAsm
#include <avr/io.h>
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#include "Memory.h"
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#define NVM_CMD_NO_OPERATION_gc (0x00<<0)
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#define NVM_CMD_READ_USER_SIG_ROW_gc (0x01<<0)
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#define NVM_CMD_READ_CALIB_ROW_gc (0x02<<0)
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#define NVM_CMD_READ_EEPROM_gc (0x06<<0)
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#define NVM_CMD_READ_FUSES_gc (0x07<<0)
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#define NVM_CMD_WRITE_LOCK_BITS_gc (0x08<<0)
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#define NVM_CMD_ERASE_USER_SIG_ROW_gc (0x18<<0)
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#define NVM_CMD_WRITE_USER_SIG_ROW_gc (0x1A<<0)
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#define NVM_CMD_ERASE_APP_gc (0x20<<0)
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#define NVM_CMD_ERASE_APP_PAGE_gc (0x22<<0)
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#define NVM_CMD_LOAD_FLASH_BUFFER_gc (0x23<<0)
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#define NVM_CMD_WRITE_APP_PAGE_gc (0x24<<0)
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#define NVM_CMD_ERASE_WRITE_APP_PAGE_gc (0x25<<0)
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#define NVM_CMD_ERASE_FLASH_BUFFER_gc (0x26<<0)
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#define NVM_CMD_ERASE_BOOT_PAGE_gc (0x2A<<0)
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#define NVM_CMD_WRITE_BOOT_PAGE_gc (0x2C<<0)
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#define NVM_CMD_ERASE_WRITE_BOOT_PAGE_gc (0x2D<<0)
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#define NVM_CMD_ERASE_EEPROM_gc (0x30<<0)
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#define NVM_CMD_ERASE_EEPROM_PAGE_gc (0x32<<0)
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#define NVM_CMD_LOAD_EEPROM_BUFFER_gc (0x33<<0)
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#define NVM_CMD_WRITE_EEPROM_PAGE_gc (0x34<<0)
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#define NVM_CMD_ERASE_WRITE_EEPROM_PAGE_gc (0x35<<0)
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#define NVM_CMD_ERASE_EEPROM_BUFFER_gc (0x36<<0)
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#define NVM_CMD_APP_CRC_gc (0x38<<0)
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#define NVM_CMD_BOOT_CRC_gc (0x39<<0)
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#define NVM_CMD_FLASH_RANGE_CRC_gc (0x3A<<0)
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#define CCP_SPM_gc (0x9D<<0)
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#define CCP_IOREG_gc (0xD8<<0)
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/* FlashCommonSPM needs to reside in boot loader section */
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#define SPM_HELPER_ADDR_REF (BOOT_SECTION_START + BOOT_SECTION_SIZE - 32)
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#ifdef SPM_HELPER_ADDR
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/* If enabled by makefile, we can check the hardcoded address from makefile
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* against avr/io.h and generate an error on mismatch */
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#if ((SPM_HELPER_ADDR - SPM_HELPER_ADDR_REF) != 0)
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#error SPM helper function addresses from Makefile and avr/io.h do not match!
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#endif
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#endif
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/* The following assembly code is taken from Atmels sp_driver.S in AVR1316 */
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; This routine reads a word from flash given by the address in
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; R25:R24:R23:R22.
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;
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; Input:
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; R25:R24:R23:R22.
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;
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; Returns:
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; R25:R24 - Read word.
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.section .text
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.global FlashReadWord
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FlashReadWord:
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in r19, RAMPZ ; Save RAMPZ.
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out RAMPZ, r24 ; Load RAMPZ with the MSB of the address.
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movw ZL, r22 ; Move the low bytes to the Z pointer
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elpm r24, Z+ ; Extended load byte from address pointed to by Z.
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elpm r25, Z ; Extended load byte from address pointed to by Z.
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out RAMPZ, r19 ; Restore RAMPZ register.
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ret
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; This routine erases the page at address R25:R24:R23:R22 in the application
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; section. The address can point anywhere inside the page.
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;
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; Input:
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; R25:R24:R23:R22 - Byte address into Flash page.
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;
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; Returns:
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; Nothing.
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.section .text
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.global FlashEraseApplicationPage
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FlashEraseApplicationPage:
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in r19, RAMPZ ; Save RAMPZ, which is restored in FlashCommonSPM.
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out RAMPZ, r24 ; Load RAMPZ with the MSB of the address.
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movw r24, r22 ; Move low bytes for ZH:ZL to R25:R24
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ldi r20, NVM_CMD_ERASE_APP_PAGE_gc ; Prepare NVM command in R20.
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jmp FlashCommonSPM ; Jump to common SPM code.
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; This routine writes the word from R23:R22 into the Flash page buffer at
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; address R25:R24.
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;
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; Input:
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; R25:R24 - Byte address into Flash page.
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; R23:R22 - Word to write.
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;
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; Returns:
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; Nothing.
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.section .text
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.global FlashLoadFlashWord
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FlashLoadFlashWord:
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in r19, RAMPZ ; Save RAMPZ, which is restored in FlashCommonSPM.
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movw r0, r22 ; Prepare flash word in R1:R0.
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ldi r20, NVM_CMD_LOAD_FLASH_BUFFER_gc ; Prepare NVM command in R20.
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jmp FlashCommonSPM ; Jump to common SPM code.
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; This routine erases first and then writes the page buffer to the
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; Flash page at address R25:R24:R23:R22 in the application section. The address
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; can point anywhere inside the page.
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;
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; Input:
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; R25:R24:R23:R22 - Byte address into Flash page.
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;
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; Returns:
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; Nothing.
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.section .text
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.global FlashEraseWriteApplicationPage
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FlashEraseWriteApplicationPage:
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in r19, RAMPZ ; Save RAMPZ, which is restored in FlashCommonSPM.
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out RAMPZ, r24 ; Load RAMPZ with the MSB of the address.
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movw r24, r22 ; Move low bytes of address to ZH:ZL from R23:R22
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ldi r20, NVM_CMD_ERASE_WRITE_APP_PAGE_gc ; Prepare NVM command in R20.
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jmp FlashCommonSPM ; Jump to common SPM code.
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; This routine flushes the Flash page buffer.
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;
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; Input:
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; Nothing.
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;
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; Returns:
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; Nothing.
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.section .text
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.global FlashEraseFlashBuffer
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FlashEraseFlashBuffer:
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in r19, RAMPZ ; Save RAMPZ, which is restored in FlashCommonSPM.
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ldi r20, NVM_CMD_ERASE_FLASH_BUFFER_gc ; Prepare NVM command in R20.
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;jmp FlashCommonSPM ; Jump to common SPM code.
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jmp FlashCommonCMD
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; This routine wait for the SPM to finish and clears the command register.
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;
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; Note that this routine is blocking, and will halt any execution until the SPM
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; is finished.
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;
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; Input:
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; Nothing.
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;
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; Returns:
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; Nothing.
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.section .text
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.global FlashWaitForSPM
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FlashWaitForSPM:
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lds r18, NVM_STATUS ; Load the NVM Status register.
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sbrc r18, NVM_NVMBUSY_bp ; Check if bit is cleared.
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rjmp FlashWaitForSPM ; Repeat check if bit is not cleared.
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clr r18
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sts NVM_CMD, r18 ; Clear up command register to NO_OPERATION.
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ret
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; This routine is called by several other routines, and contains common code
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; for executing an NVM command, including the return statement itself.
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;
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; If the operation (NVM command) requires the NVM Address registers to be
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; prepared, this must be done before jumping to this routine.
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;
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; Note that R25:R24:R23:R22 is used for returning results, even if the
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; C-domain calling function only expects a single byte or even void.
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;
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; Input:
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; R20 - NVM Command code.
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;
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; Returns:
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; R25:R24:R23:R22 - 32-bit result from NVM operation.
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.section .text
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FlashCommonCMD:
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sts NVM_CMD, r20 ; Load command into NVM Command register.
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ldi r18, CCP_IOREG_gc ; Prepare Protect IO-register signature in R18.
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ldi r19, NVM_CMDEX_bm ; Prepare bitmask for setting NVM Command Execute bit into R19.
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sts CCP, r18 ; Enable IO-register operation (this disables interrupts for 4 cycles).
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sts NVM_CTRLA, r19 ; Load bitmask into NVM Control Register A, which executes the command.
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lds r22, NVM_DATA0 ; Load NVM Data Register 0 into R22.
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lds r23, NVM_DATA1 ; Load NVM Data Register 1 into R23.
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lds r24, NVM_DATA2 ; Load NVM Data Register 2 into R24.
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clr r25 ; Clear R25 in order to return a clean 32-bit value.
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ret
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; This routine is called by several other routines, and contains common code
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; for executing an LPM command, including the return statement itself.
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;
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; Note that R24 is used for returning results, even if the
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; C-domain calling function expects a void.
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;
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; Input:
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; R25:R24 - Low bytes of Z pointer.
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; R20 - NVM Command code.
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;
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; Returns:
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; R24 - Result from LPM operation.
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.section .text
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FlashCommonLPM:
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movw ZL, r24 ; Load index into Z.
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sts NVM_CMD, r20 ; Load prepared command into NVM Command register.
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lpm r24,Z
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ret
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; This routine is called by several other routines, and contains common code
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; for executing an SPM command, including the return statement itself.
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;
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; If the operation (SPM command) requires the R1:R0 registers to be
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; prepared, this must be done before jumping to this routine.
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;
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; Input:
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; R1:R0 - Optional input to SPM command.
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; R25:R24 - Low bytes of Z pointer.
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; R20 - NVM Command code.
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;
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; Returns:
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; Nothing.
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.section .spmhelper
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FlashCommonSPM:
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movw ZL, r24 ; Load R25:R24 into Z.
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sts NVM_CMD, r20 ; Load prepared command into NVM Command register.
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ldi r18, CCP_SPM_gc ; Prepare Protect SPM signature in R18
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sts CCP, r18 ; Enable SPM operation (this disables interrupts for 4 cycles).
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spm ; Self-program.
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clr r1 ; Clear R1 for GCC _zero_reg_ to function properly.
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out RAMPZ, r19 ; Restore RAMPZ register.
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ret
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/* Reserve memory for data */
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.section .flashdata
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.align 1
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.skip MEMORY_SIZE, MEMORY_INIT_VALUE
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