jens
ea60299d26
git-svn-id: http://moon:8086/svn/vhdl/trunk@1414 cc03376c-175c-47c8-b038-4cd826a8556b
308 lines
6.3 KiB
JavaScript
308 lines
6.3 KiB
JavaScript
; -------------------------------------------------
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; Register definitions
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; -------------------------------------------------
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include "../../../lib/jasm/cregs.inc.jsm"
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include "xregs.inc.jsm"
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; -------------------------------------------------
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; Constants
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; -------------------------------------------------
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BURST_LEN: equ 8
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SD_CMD_WRITE: equ 0x06
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SD_CMD_READ: equ 0x05
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addr_msb_max: equ 0x40
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; External RAM/ROM
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xmem
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crlf: dc 13, 10, 0
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greet_txt: dc "SDRAM Test", 0
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msg_txt0: dc "Clearing SDRAM", 0
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msg_txt1: dc "Writing SDRAM", 0
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msg_txt2: dc "Reading SDRAM", 0
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verify_ok: dc "Verify OK", 0
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verify_nok: dc "Failed at ", 0
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dot: dc ".", 0
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org 0x80
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sdram_data: db 8 ; SDRAM data window at X:0x80
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; Internal RAM
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cmem 0
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round: db 1
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; -------------------------------------------------
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; Program
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; -------------------------------------------------
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code
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reset: org 0x000
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jmp main
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; -------------------------------------------------
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; ISR
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; -------------------------------------------------
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org 0x001
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reti
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; -------------------------------------------------
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; Main
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; -------------------------------------------------
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main:
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mov R0, 0x00
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xout (led_port), R0
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; xin R0, (btn_port)
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; tst R0
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; jz no_vga
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mov R0, CTRL_VGA_ENABLE
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xout (ctrl_reg), R0
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no_vga: mov R0, 0
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mov R1, 0x80
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xout (reg_color_red), R0
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xout (reg_color_grn), R1
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xout (reg_color_blu), R0
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jmp do_write
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; ----------------------------------------------------------
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; SDRAM clear
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; ----------------------------------------------------------
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; Set SDRAM address register to 0
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do_clear: call AddrCnt_Init
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; Fill SDR Buffer with zeros
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mov R0, sdram_data
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mov R15, 8
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buf_clr_loop: movx (R0), 0
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inc R0
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dec R15
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jnz buf_clr_loop
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sdr_clear: xin R0, (sdram_addr+0)
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cmp R0, addr_msb_max
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jeq clear_finished
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mov R2, BURST_LEN
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poll_clear_full:
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xin R0, (sdram_reg)
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xout (led_port), R0
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and R0, FIFO_STAT_WRITE_DATA_FULL
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jnz poll_clear_full
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; Fill FIFO
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mov R0, FIFO_CTRL_IS_WRITE
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xout (sdram_reg), R0
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sub R2, 2
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jnz poll_clear_full
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; Start SDR write
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call wait_cmd_rdy
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mov R0, SD_CMD_WRITE
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xout (sdram_reg), R0
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; Advance address counter
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mov R0, BURST_LEN
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call AddrCnt_Adv
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jmp sdr_clear
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clear_finished:
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call AddrCnt_Disp
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; ----------------------------------------------------------
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; SDRAM Write
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; ----------------------------------------------------------
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do_write: ; Clear LCD
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; Set SDRAM address register to 0
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call AddrCnt_Init
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mov R0, 0
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movc (round), R0
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sdr_write: xin R0, (sdram_addr+0)
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cmp R0, addr_msb_max
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jeq write_finished
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mov R2, BURST_LEN
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; Fill SDR Buffer
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sdr_burst_wr: movc R1, (round)
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; xin R0, (sdram_addr+2)
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; cmp R0, 0x7F
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; jne force_no_err
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; inc R1
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force_no_err: mov R0, sdram_data
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mov R15, 8
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write_loop: movx (R0), R1
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inc R0
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inc R1
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dec R15
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jnz write_loop
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poll_write_full:
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xin R0, (sdram_reg)
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xout (led_port), R0
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and R0, FIFO_STAT_WRITE_DATA_FULL
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jnz poll_write_full
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; Fill FIFO
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mov R0, FIFO_CTRL_IS_WRITE
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xout (sdram_reg), R0
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movc R0, (round)
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inc R0
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movc (round), R0
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sub R2, 2
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jnz sdr_burst_wr
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; Start SDR write
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call wait_cmd_rdy
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mov R0, SD_CMD_WRITE
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xout (sdram_reg), R0
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; Advance address counter
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mov R0, BURST_LEN
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call AddrCnt_Adv
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jmp sdr_write
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write_finished: call AddrCnt_Disp
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; ----------------------------------------------------------
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; SDRAM Verify
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; ----------------------------------------------------------
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do_read: ; Clear LCD
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; Set SDRAM address register to 0
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call AddrCnt_Init
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mov R0, 0
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movc (round), R0
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sdr_read: xin R0, (sdram_addr+2)
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cmp R0, addr_msb_max
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jeq read_finished
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; Start SDR read
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call wait_cmd_rdy
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mov R0, SD_CMD_READ
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xout (sdram_reg), R0
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mov R3, BURST_LEN
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; Wait last read
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poll_read_fin: xin R0, (sdram_reg)
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xout (led_port), R0
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and R0, FIFO_STAT_READ_DATA_EMPTY
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jnz poll_read_fin
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; Verify SDR Buffer
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movc R1, (round)
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mov R0, sdram_data
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mov R15, 8
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read_loop: movx R2, (R0)
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cmp R2, R1
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jne verify_error
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inc R0
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inc R1
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dec R15
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jnz read_loop
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; Advance Read-FIFO
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mov R0, FIFO_CTRL_IS_READ
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xout (sdram_reg), R0
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movc R0, (round)
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inc R0
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movc (round), R0
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sub R3, 2
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jnz poll_read_fin
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; Advance address counter
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mov R0, BURST_LEN
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call AddrCnt_Adv
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jmp sdr_read
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; ----------------------------------------------------------
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sd_request: push R0
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mov R0, SDRAM_CTRL_REQUEST
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xout (sdram_reg), R0
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wait4grant: xin R0, (sdram_reg)
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xout (led_port), R0
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and R0, SDRAM_STAT_ACCESS
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jz wait4grant
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pop R0
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ret
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; ----------------------------------------------------------
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wait_cmd_rdy: call sd_request
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push R0
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wait4cmd: xin R0, (sdram_reg)
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xout (led_port), R0
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and R0, FIFO_STAT_CMD_FULL
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jnz wait4cmd
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pop R0
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ret
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; ----------------------------------------------------------
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read_finished:
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no_error: jmp ende
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verify_error: jmp ende
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ende: jmp do_clear
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; -------------------------------------------------
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AddrCnt_Init: push R0
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mov R0, 0x00
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xout (sdram_addr+0), R0
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xout (sdram_addr+1), R0
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xout (sdram_addr+2), R0
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pop R0
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ret
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; -------------------------------------------------
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; Parameter
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; R0: increment value
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AddrCnt_Adv: push R1
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push R2
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push R3
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xin R1, (sdram_addr+0)
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xin R2, (sdram_addr+1)
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xin R3, (sdram_addr+2)
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add R1, R0
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addc R2, 0
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addc R3, 0
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xout (sdram_addr+0), R1
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xout (sdram_addr+1), R2
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xout (sdram_addr+2), R3
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pop R3
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pop R2
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pop R1
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ret
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; -------------------------------------------------
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; Display Address counter
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AddrCnt_Disp: ret
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; -------------------------------------------------
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; PutHexByte
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; R0 : Byte value
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PutHexByte: ret
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; -------------------------------------------------
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print_addr: ret
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; -------------------------------------------------
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print_data: ret
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; -------------------------------------------------
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include "../../../lib/jasm/utils.inc.jsm"
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