from myhdl import * t_TxState = enum('tx_high_setup', 'tx_high_hold', 'tx_oneus', 'tx_low_setup', 'tx_low_hold', 'tx_fortyus', 'tx_done'); t_State = enum('display_init', 'init_fifteenms', 'init_one', 'init_two', 'init_three', 'init_four', 'init_five', 'init_six', 'init_seven', 'init_eight', 'display_function_set', 'display_entry_set', 'display_set_display', 'display_clr_display', 'display_pause_setup', 'display_pause', 'display_done', 'display_set_addr', 'display_char_write') def delayCounter(clk, reset, count, load, done, width = 13): counter = Signal(intbv(0)[width:0]) @always_comb def done_logic(): done.next = (counter == 0) @always(clk.posedge) def countdown_logic(): if load: counter.next = count else: #elif not done: counter.next = counter - 1 return instances() def lcd(clk, reset, dat, addr, we, busy, SF_D, LCD_E, LCD_RS, LCD_RW): state = Signal(t_State.display_init) tx_state = Signal(t_TxState.tx_done) tx_byte = Signal(intbv(0)[8:0]) tx_init = Signal(bool()) tx_done = Signal(bool()) LCD_E0 = Signal(bool()) SF_D0 = Signal(intbv(0)[4:0]) LCD_E1 = Signal(bool()) SF_D1 = Signal(intbv(0)[4:0]) @always_comb def busy_and_rw_handlers(): busy.next = (state != t_State.display_done) LCD_RW.next = 0 #Delay counter main_delay_load = Signal(bool()) main_delay_value = Signal(intbv(0)[20:0]) tx_delay_load = Signal(bool()) main_delay_load = Signal(bool()) delay_load = Signal(bool()) tx_delay_value = Signal(intbv(0)[20:0]) main_delay_value = Signal(intbv(0)[20:0]) delay_value = Signal(intbv(0)[20:0]) delay_done = Signal(bool()) output_selector = Signal(bool()) counter = delayCounter(clk, reset, delay_value, delay_load, delay_done, width = 21) @always_comb def conunter_sharing_load(): delay_load.next = tx_delay_load or main_delay_load @always_comb def conunter_sharing_value(): if tx_delay_load: delay_value.next = tx_delay_value else: delay_value.next = main_delay_value # SF_D and LCD_E management for sharing between Init and TX phases. @always_comb def output_tx_or_init_select(): # 0 tx; 1 init output_selector.next = (state == t_State.display_init) | (state == t_State.init_fifteenms) | (state == t_State.init_one) | (state == t_State.init_two) | (state == t_State.init_three) | (state == t_State.init_four) | (state == t_State.init_five) | (state == t_State.init_six) | (state == t_State.init_seven) | (state == t_State.init_eight) @always_comb def output_tx_or_init_mux(): if output_selector: # Init SF_D.next = SF_D1 LCD_E.next = LCD_E1 else: # TX SF_D.next = SF_D0 LCD_E.next = LCD_E0 @always_comb def init_transmissions(): tx_init.next = (~tx_done) & ((state == t_State.display_function_set) | (state == t_State.display_entry_set) | (state == t_State.display_set_display) | (state == t_State.display_clr_display) | (state == t_State.display_set_addr) | (state == t_State.display_char_write)) LCD_RS.next = ~(bool(state == t_State.display_function_set) | (state == t_State.display_entry_set) | (state == t_State.display_set_display) | (state == t_State.display_clr_display) | (state == t_State.display_set_addr)) @always(clk.posedge, reset.posedge) def DisplayFSM(): if reset == 1: state.next = t_State.display_init main_delay_load.next = 0 main_delay_value.next = 0 SF_D1.next = 0 LCD_E1.next = 0 tx_byte.next = 0 else: main_delay_load.next = 0; main_delay_value.next = 0; if state == t_State.display_init: tx_byte.next = 0 #00000000 state.next = t_State.init_fifteenms main_delay_load.next = 1 main_delay_value.next = 750000 elif state == t_State.init_fifteenms: main_delay_load.next = 0 if delay_done: state.next = t_State.init_one; main_delay_load.next = 1 main_delay_value.next = 11 elif state == t_State.init_one: main_delay_load.next = 0 SF_D1.next = 3 LCD_E1.next = 1 if delay_done: state.next = t_State.init_two; main_delay_load.next = 1 main_delay_value.next = 205000 elif state == t_State.init_two: main_delay_load.next = 0 LCD_E1.next = 0 if delay_done: state.next = t_State.init_three; main_delay_load.next = 1 main_delay_value.next = 11 elif state == t_State.init_three: main_delay_load.next = 0 SF_D1.next = 3 LCD_E1.next = 1 if delay_done: state.next = t_State.init_four; main_delay_load.next = 1 main_delay_value.next = 5000 elif state == t_State.init_four: main_delay_load.next = 0 LCD_E1.next = 0 if delay_done: state.next = t_State.init_five; main_delay_load.next = 1 main_delay_value.next = 11 elif state == t_State.init_five: main_delay_load.next = 0 SF_D1.next = 3 LCD_E1.next = 1 if delay_done: state.next = t_State.init_six; main_delay_load.next = 1 main_delay_value.next = 2000 elif state == t_State.init_six: main_delay_load.next = 0 LCD_E1.next = 0 if delay_done: state.next = t_State.init_seven; main_delay_load.next = 1 main_delay_value.next = 11 elif state == t_State.init_seven: main_delay_load.next = 0 SF_D1.next = 2 LCD_E1.next = 1 if delay_done: state.next = t_State.init_eight; main_delay_load.next = 1 main_delay_value.next = 2000 elif state == t_State.init_eight: main_delay_load.next = 0 LCD_E1.next = 0 if delay_done: state.next = t_State.display_function_set; elif state == t_State.display_function_set: tx_byte.next = 40 #00101000 if tx_done: state.next = t_State.display_entry_set elif state == t_State.display_entry_set: tx_byte.next = 6 #00000110 if tx_done: state.next = t_State.display_set_display elif state == t_State.display_set_display: tx_byte.next = 12 #00001100 if tx_done: state.next = t_State.display_clr_display elif state == t_State.display_clr_display: tx_byte.next = 1 #00000001 if tx_done: state.next = t_State.display_pause_setup main_delay_load.next = 1 main_delay_value.next = 82000 elif state == t_State.display_pause_setup: state.next = t_State.display_pause elif state == t_State.display_pause: tx_byte.next = 0 #00000000 if delay_done: state.next = t_State.display_done; elif state == t_State.display_done: tx_byte.next = 0 #00000000 if we: state.next = t_State.display_function_set else: state.next = t_State.display_done elif state == t_State.display_set_addr: tx_byte.next = 128+addr #10000000 if tx_done: state.next = t_State.display_char_write elif state == t_State.display_char_write: tx_byte.next = dat if tx_done: state.next = t_State.display_done; # else: # raise ValueError("Undefined Display state") @always(clk.posedge, reset.posedge) def TxFSM(): if reset == 1: tx_state.next = t_TxState.tx_done SF_D0.next = 0 LCD_E0.next = 0 else: tx_delay_load.next = 0; tx_delay_value.next = 0; if tx_state == t_TxState.tx_high_setup: LCD_E0.next = 0 SF_D0.next = tx_byte[8 : 4] tx_delay_load.next = 0 if delay_done: tx_state.next = t_TxState.tx_high_hold tx_delay_load.next = 1 tx_delay_value.next = 12 elif tx_state == t_TxState.tx_high_hold: LCD_E0.next = 1 SF_D0.next = tx_byte[8 : 4] tx_delay_load.next = 0 if delay_done: tx_state.next = t_TxState.tx_oneus tx_delay_load.next = 1 tx_delay_value.next = 50 elif tx_state == t_TxState.tx_oneus: LCD_E0.next = 0 tx_delay_load.next = 0 if delay_done: tx_state.next = t_TxState.tx_low_setup tx_delay_load.next = 1 tx_delay_value.next = 2 elif tx_state == t_TxState.tx_low_setup: LCD_E0.next = 0 SF_D0.next = tx_byte[4 : 0] tx_delay_load.next = 0 if delay_done: tx_state.next = t_TxState.tx_low_hold tx_delay_load.next = 1 tx_delay_value.next = 12 elif tx_state == t_TxState.tx_low_hold: LCD_E0.next = 1 SF_D0.next = tx_byte[4 : 0] tx_delay_load.next = 0 if delay_done: tx_state.next = t_TxState.tx_fortyus tx_delay_load.next = 1 tx_delay_value.next = 2000 elif tx_state == t_TxState.tx_fortyus: LCD_E0.next = 0 tx_delay_load.next = 0 if delay_done: tx_state.next = t_TxState.tx_done tx_done.next = 1 elif tx_state == t_TxState.tx_done: LCD_E0.next = 0 tx_done.next = 0 tx_delay_load.next = 0 if tx_init: tx_state.next = t_TxState.tx_high_setup tx_delay_load.next = 1 tx_delay_value.next = 2 # else: # raise ValueError("Undefined TX state") return instances() def main(): width = 20 count = Signal(intbv(0)[width:0]) clk, reset, we, busy, LCD_E, LCD_RS, LCD_RW = [Signal(bool(0)) for i in range(7)] dat = Signal(intbv(0)[32:0]) addr = Signal(intbv(0)[7:0]) SF_D = Signal(intbv(0)[4:0]) toVerilog(lcd, clk, reset, dat, addr, we, busy, SF_D, LCD_E, LCD_RS, LCD_RW) toVHDL(lcd, clk, reset, dat, addr, we, busy, SF_D, LCD_E, LCD_RS, LCD_RW) if __name__ == '__main__': main()