213 lines
4.0 KiB
ArmAsm
Executable File
213 lines
4.0 KiB
ArmAsm
Executable File
;---------------------------------------------------------------------------;
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; MMC hardware controls and Flash controls (C)ChaN, 2010
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;---------------------------------------------------------------------------;
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; Hardware dependent macros to be modified
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#define DDR_CS _SFR_IO_ADDR(DDRB), 4 // MMC CS pin (DDR, PORT)
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#define PORT_CS _SFR_IO_ADDR(PORTB), 4
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#define DDR_CK _SFR_IO_ADDR(DDRB), 7 // MMC SCLK pin (DDR, PORT)
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#define PORT_CK _SFR_IO_ADDR(PORTB), 7
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#define DDR_DI _SFR_IO_ADDR(DDRB), 5 // MMC DI pin (DDR, PORT)
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#define PORT_DI _SFR_IO_ADDR(PORTB), 5
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#define PIN_DO _SFR_IO_ADDR(PINB), 6 // MMC DO pin (PIN, PORT)
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#define PORT_DO _SFR_IO_ADDR(PORTB), 6
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;---------------------------------------------------------------------------;
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.nolist
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#include <avr/io.h>
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.list
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.text
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;---------------------------------------------------------------------------;
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; Initialize MMC port
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;
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; void init_spi (void);
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.global init_spi
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.func init_spi
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init_spi:
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sbi DDR_CS ; CS: output
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sbi DDR_DI ; DI: output
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sbi DDR_CK ; SCLK: output
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sbi PORT_DO ; DO: pull-up
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ret
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.endfunc
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;---------------------------------------------------------------------------;
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; Delay 100 microseconds
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;
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; void dly_us (UINT n);
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.global dly_100us
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.func dly_100us
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dly_100us:
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ldi r24, lo8(F_CPU / 100000) /* Loop counter */
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1: sbiw r30, 1 /* 10 clocks per loop */
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sbiw r30, 1
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sbiw r30, 1
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nop
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dec r24
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brne 1b
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ret
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.endfunc
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;---------------------------------------------------------------------------;
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; Select MMC
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;
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; void select (void);
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.global select
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.func select
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select:
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rcall deselect
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cbi PORT_CS
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rjmp rcv_spi
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.endfunc
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;---------------------------------------------------------------------------;
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; Deselect MMC
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;
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; void deselect (void);
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.global deselect
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.func deselect
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deselect:
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sbi PORT_CS
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; Goto next function
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.endfunc
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;---------------------------------------------------------------------------;
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; Receive a byte
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;
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; BYTE rcv_spi (void);
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.global rcv_spi
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.func rcv_spi
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rcv_spi:
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ldi r24, 0xFF ; Send 0xFF to receive data
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; Goto next function
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.endfunc
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;---------------------------------------------------------------------------;
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; Transmit a byte
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;
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; void xmit_spi (BYTE);
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.global xmit_spi
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.func xmit_spi
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xmit_spi:
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ldi r25, 8
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1: sbrc r24, 7 ; DI = Bit to sent
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sbi PORT_DI ;
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sbrs r24, 7 ;
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cbi PORT_DI ; /
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lsl r24 ; Get DO from MMC
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sbic PIN_DO ;
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inc r24 ; /
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sbi PORT_CK ; A positive pulse to SCLK
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cbi PORT_CK ; /
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dec r25 ; Repeat 8 times
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brne 1b ; /
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ret
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.endfunc
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;---------------------------------------------------------------------------
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; Erase a flash page
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;
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; void flash_erase (DWORD flash_addr);
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.global flash_erase
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.func flash_erase
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flash_erase:
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movw ZL, r22
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#if FLASHEND >= 0x10000
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out _SFR_IO_ADDR(RAMPZ), r24
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#endif
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; Initiate erase operation
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ldi r24, 0b00000011
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sts _SFR_MEM_ADDR(SPMCSR), r24
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spm
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; Wait for end of erase operation
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1: lds r24, _SFR_MEM_ADDR(SPMCSR)
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sbrc r24, 0
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rjmp 1b
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; Re-enable read access to the flash
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ldi r24, 0b00010001
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sts _SFR_MEM_ADDR(SPMCSR), r24
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spm
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9: ret
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.endfunc
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;---------------------------------------------------------------------------
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; Write a flash page
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;
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; void flash_write (DWORD flash_addr, const BYTE* data);
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.global flash_write
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.func flash_write
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flash_write:
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push r0
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push r1
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#if FLASHEND >= 0x10000
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out _SFR_IO_ADDR(RAMPZ), r24
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#endif
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; Fill page buffer
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movw ZL, r22
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movw XL, r20
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ldi r25, lo8(SPM_PAGESIZE/2)
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1: ld r0, X+
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ld r1, X+
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ldi r24, 0b00000001
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sts _SFR_MEM_ADDR(SPMCSR), r24
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spm
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adiw ZL, 2
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dec r25
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brne 1b
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; Initiate write operation
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movw ZL, r22
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ldi r24, 0b00000101
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sts _SFR_MEM_ADDR(SPMCSR), r24
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spm
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; Wait for end of write operation
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2: lds r24, _SFR_MEM_ADDR(SPMCSR)
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sbrc r24, 0
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rjmp 2b
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; Re-enable read access to the flash
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ldi r24, 0b00010001
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sts _SFR_MEM_ADDR(SPMCSR), r24
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spm
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9: pop r1
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pop r0
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ret
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.endfunc
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