📄 spi_prog.psm
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;KCPSM3 Program - UART programming of SPI Flash memory on Spartan-3E Starter Kit.
;
;
;Ken Chapman - Xilinx Ltd
;
;Version v1.00 - 11th November 2005
;
;This program uses a 115200 baud UART connection with XON/XOFF flow control
;to allow a standard MCS file for the configuration of a Spartan-3E device to
;be programmed into the ST Microelectronics M25P16 device on the board.
;
;
;
;As well as the port connections vital to communication with the UART and the SPI
;FLASH memory, there are additional port connections used to disable the other
;devices sharing the SPI bus on the Starter Kit board. Although these could have been
;controlled at the hardware level, they are included in this code to aid
;future investigations of communication with the other SPI devices using PicoBlaze.
;
;
;
;
;Port definitions
;
CONSTANT status_port, 00 ;UART and filter status input
CONSTANT tx_data_present, 01 ; Transmitter data present - bit0
CONSTANT tx_half_full, 02 ; FIFO half full - bit1
CONSTANT tx_full, 04 ; full - bit2
CONSTANT rx_data_present, 08 ; data present - bit3
CONSTANT rx_half_full, 10 ; Receiver half full - bit4
CONSTANT rx_full, 20 ; FIFO full - bit5
;
CONSTANT UART_read_port, 01 ;UART Rx data input
;
CONSTANT UART_write_port, 10 ;UART Tx data output
;
;
CONSTANT SPI_control_port, 08 ;SPI clock and chip selects
CONSTANT SPI_sck, 01 ; SCK - bit0
CONSTANT SPI_rom_cs, 02 ; serial rom select - bit1
CONSTANT SPI_spare_control, 04 ; spare - bit2
CONSTANT SPI_amp_cs, 08 ; amplifier select - bit3
CONSTANT SPI_adc_conv, 10 ; A/D convert - bit4
CONSTANT SPI_dac_cs, 20 ; D/A select - bit5
CONSTANT SPI_amp_shdn, 40 ; amplifier SHDN - bit6
CONSTANT SPI_dac_clr, 80 ; D/A clear - bit7
;
CONSTANT SPI_output_port, 04 ;SPI data output
CONSTANT SPI_sdo, 80 ; SDO - bit7
;
CONSTANT SPI_input_port, 02 ;SPI data input
CONSTANT SPI_sdi, 80 ; SDI - bit7
CONSTANT SPI_amp_sdi, 40 ; amplifier SDI - bit6
;
;
;
;
;Special Register usage
;
NAMEREG sF, UART_data ;used to pass data to and from the UART
;
;
;Useful data constants
;
;
;Constant to define a software delay of 1us. This must be adjusted to reflect the
;clock applied to KCPSM3. Every instruction executes in 2 clock cycles making the
;calculation highly predictable. The '6' in the following equation even allows for
;'CALL delay_1us' instruction in the initiating code.
;
; delay_1us_constant = (clock_rate - 6)/4 Where 'clock_rate' is in MHz
;
;Example: For a 50MHz clock the constant value is (10-6)/4 = 11 (0B Hex).
;For clock rates below 10MHz the value of 1 must be used and the operation will
;become lower than intended.
;
CONSTANT delay_1us_constant, 0B
;
;
;Useful constants
;
;
;ASCII table
;
CONSTANT character_a, 61
CONSTANT character_b, 62
CONSTANT character_c, 63
CONSTANT character_d, 64
CONSTANT character_e, 65
CONSTANT character_f, 66
CONSTANT character_g, 67
CONSTANT character_h, 68
CONSTANT character_i, 69
CONSTANT character_j, 6A
CONSTANT character_k, 6B
CONSTANT character_l, 6C
CONSTANT character_m, 6D
CONSTANT character_n, 6E
CONSTANT character_o, 6F
CONSTANT character_p, 70
CONSTANT character_q, 71
CONSTANT character_r, 72
CONSTANT character_s, 73
CONSTANT character_t, 74
CONSTANT character_u, 75
CONSTANT character_v, 76
CONSTANT character_w, 77
CONSTANT character_x, 78
CONSTANT character_y, 79
CONSTANT character_z, 7A
CONSTANT character_A, 41
CONSTANT character_B, 42
CONSTANT character_C, 43
CONSTANT character_D, 44
CONSTANT character_E, 45
CONSTANT character_F, 46
CONSTANT character_G, 47
CONSTANT character_H, 48
CONSTANT character_I, 49
CONSTANT character_J, 4A
CONSTANT character_K, 4B
CONSTANT character_L, 4C
CONSTANT character_M, 4D
CONSTANT character_N, 4E
CONSTANT character_O, 4F
CONSTANT character_P, 50
CONSTANT character_Q, 51
CONSTANT character_R, 52
CONSTANT character_S, 53
CONSTANT character_T, 54
CONSTANT character_U, 55
CONSTANT character_V, 56
CONSTANT character_W, 57
CONSTANT character_X, 58
CONSTANT character_Y, 59
CONSTANT character_Z, 5A
CONSTANT character_0, 30
CONSTANT character_1, 31
CONSTANT character_2, 32
CONSTANT character_3, 33
CONSTANT character_4, 34
CONSTANT character_5, 35
CONSTANT character_6, 36
CONSTANT character_7, 37
CONSTANT character_8, 38
CONSTANT character_9, 39
CONSTANT character_colon, 3A
CONSTANT character_fullstop, 2E
CONSTANT character_semi_colon, 3B
CONSTANT character_minus, 2D
CONSTANT character_plus, 2B
CONSTANT character_comma, 2C
CONSTANT character_less_than, 3C ;'<'
CONSTANT character_greater_than, 3E ;'>'
CONSTANT character_open, 28 ;'('
CONSTANT character_close, 29 ;')'
CONSTANT character_divide, 2F ;'/'
CONSTANT character_equals, 3D
CONSTANT character_space, 20
CONSTANT character_CR, 0D ;carriage return
CONSTANT character_LF, 0A ;line feed
CONSTANT character_question, 3F ;'?'
CONSTANT character_dollar, 24
CONSTANT character_exclaim, 21 ;'!'
CONSTANT character_BS, 08 ;Back Space command character
CONSTANT character_XON, 11 ;Flow control ON
CONSTANT character_XOFF, 13 ;Flow control OFF
;
;
;Scratch Pad Memory Locations
;
;
CONSTANT ISR_preserve_s0, 00 ;preserve register during ISR
;
CONSTANT page_address_h, 01 ;Remember page address for SPI boundary checking.
CONSTANT page_address_m, 02 ;high, middle and low bytes
CONSTANT page_address_l, 03
;
CONSTANT SPI_control_status, 04 ;SPI status signals
;
;
;
;Store up to one line of an MCS file as bytes
;A typical data line consists of:-
;: Start character which is not stored
;10 Number of data bytes included (16 in this case)
;aaaa Lower 16-bits of the storage address
;00 Record type (data in this case)
;dddd... Data bytes (typically 16 which is the maximum)
;cc Checksum
;CR/LF Line will end in carriage return and/or line feed which is not stored.
;
;So a total of 21 could be stored before processing.
;
CONSTANT line_start, 2B ;21 bytes until end of memory
;
;
;Initialise the system and welcome message
;
;
cold_start: CALL SPI_init ;initialise SPI bus ports
CALL delay_1s ;delay because UART is fast and JTAG startup sequence can be slow
ENABLE INTERRUPT ;Interrupt is used for XON/XOFF flow control
welcome_start: CALL send_CR
CALL send_welcome ;start up message and version number
;
;Main menu and command selection
;
;
;
warm_start: CALL send_Menu ;Menu and command selection
prompt: CALL send_CR
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