?? adc_ctrl.psm
字號:
;KCPSM3 Program - SPI Control of Amplifier and A/D converter on Spartan-3E Starter Kit.
;
;
;Ken Chapman - Xilinx Ltd
;
;Version v1.00 - 21th December 2005
;
;This program uses an 8KHz interrupt to generate test waveforms on the
;4 analogue outputs provided by the Linear Technology LTC2624 device.
;
;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.
;
;Connections to the LEDs, switches and press buttons are provided to aid
;development and enable further experiments. Otherwise know as having fun!
;
;Port definitions
;
;
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, 01 ;SPI data input
CONSTANT SPI_sdi, 80 ; SDI - bit7
CONSTANT SPI_amp_sdi, 40 ; amplifier SDI - bit6
;
;
CONSTANT LED_port, 80 ;8 simple LEDs
CONSTANT LED0, 01 ; LED 0 - bit0
CONSTANT LED1, 02 ; 1 - bit1
CONSTANT LED2, 04 ; 2 - bit2
CONSTANT LED3, 08 ; 3 - bit3
CONSTANT LED4, 10 ; 4 - bit4
CONSTANT LED5, 20 ; 5 - bit5
CONSTANT LED6, 40 ; 6 - bit6
CONSTANT LED7, 80 ; 7 - bit7
;
;
CONSTANT switch_port, 00 ;Read switches and press buttons
CONSTANT BTN_north, 01 ; Buttons North - bit0
CONSTANT BTN_east, 02 ; East - bit1
CONSTANT BTN_south, 04 ; South - bit2
CONSTANT BTN_west, 08 ; West - bit3
CONSTANT switch0, 10 ; Switches 0 - bit4
CONSTANT switch1, 20 ; 1 - bit5
CONSTANT switch2, 40 ; 2 - bit6
CONSTANT switch3, 80 ; 3 - bit7
;
;LCD interface ports
;
;The master enable signal is not used by the LCD display itself
;but may be required to confirm that LCD communication is active.
;This is required on the Spartan-3E Starter Kit if the StrataFLASH
;is used because it shares the same data pins and conflicts must be avoided.
;
CONSTANT LCD_output_port, 40 ;LCD character module output data and control
CONSTANT LCD_E, 01 ; active High Enable E - bit0
CONSTANT LCD_RW, 02 ; Read=1 Write=0 RW - bit1
CONSTANT LCD_RS, 04 ; Instruction=0 Data=1 RS - bit2
CONSTANT LCD_drive, 08 ; Master enable (active High) - bit3
CONSTANT LCD_DB4, 10 ; 4-bit Data DB4 - bit4
CONSTANT LCD_DB5, 20 ; interface Data DB5 - bit5
CONSTANT LCD_DB6, 40 ; Data DB6 - bit6
CONSTANT LCD_DB7, 80 ; Data DB7 - bit7
;
;
CONSTANT LCD_input_port, 02 ;LCD character module input data
CONSTANT LCD_read_spare0, 01 ; Spare bits - bit0
CONSTANT LCD_read_spare1, 02 ; are zero - bit1
CONSTANT LCD_read_spare2, 04 ; - bit2
CONSTANT LCD_read_spare3, 08 ; - bit3
CONSTANT LCD_read_DB4, 10 ; 4-bit Data DB4 - bit4
CONSTANT LCD_read_DB5, 20 ; interface Data DB5 - bit5
CONSTANT LCD_read_DB6, 40 ; Data DB6 - bit6
CONSTANT LCD_read_DB7, 80 ; Data DB7 - bit7
;
;
;
;
;Special Register usage
;
;
;
;Scratch Pad Memory Locations
;
;Values read from the A/D converter
;
CONSTANT ADC0_lsb, 00 ;ADC Channel 0 value LS-Byte
CONSTANT ADC0_msb, 01 ; MS-Byte
;
CONSTANT ADC1_lsb, 02 ;ADC Channel 1 value LS-Byte
CONSTANT ADC1_msb, 03 ; MS-Byte
;
;Amplifier gain settings.
;
;Stored value is the 4-bit code for gain setting
; Code 1 2 3 4 5 6 7
; Gain -1 -2 -5 -10 -20 -50 -100
CONSTANT amp_A_gain, 04 ;Amplifier A gain value
CONSTANT amp_B_gain, 05 ;Amplifier B gain value
;
;Sample counter used to give activity indication on LEDs
;
CONSTANT sample_count, 06 ;8-bit counter LS-Byte
;
CONSTANT decimal0, 07 ;5 digit decimal value
CONSTANT decimal1, 08
CONSTANT decimal2, 09
CONSTANT decimal3, 0A
CONSTANT decimal4, 0B
;
;
;
;
;Useful data constants
;
CONSTANT VREF_lsb, 72 ;Reference voltage in milli-volts
CONSTANT VREF_msb, 06 ;Nominal value 1.65v so value is 1650 (0672 hex)
;
;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
;
;
;
;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_stop, 2E
CONSTANT character_semi_colon, 3B
CONSTANT character_minus, 2D
CONSTANT character_divide, 2F ;'/'
CONSTANT character_plus, 2B
CONSTANT character_comma, 2C
CONSTANT character_less_than, 3C
CONSTANT character_greater_than, 3E
CONSTANT character_equals, 3D
CONSTANT character_space, 20
CONSTANT character_CR, 0D ;carriage return
CONSTANT character_question, 3F ;'?'
CONSTANT character_dollar, 24
CONSTANT character_exclaim, 21 ;'!'
CONSTANT character_BS, 08 ;Back Space command character
;
;
;
;
;
;
;Initialise the system
;
;
cold_start: CALL SPI_init ;initialise SPI bus ports
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