2015-03-28 21:45:40 +00:00
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/*
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2017-06-30 08:22:17 +01:00
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* This file is part of the MicroPython project, http://micropython.org/
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2015-03-28 21:45:40 +00:00
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <p33Fxxxx.h>
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#include "board.h"
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/********************************************************************/
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// CPU
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void cpu_init(void) {
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// set oscillator to operate at 40MHz
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// Fosc = Fin*M/(N1*N2), Fcy = Fosc/2
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// Fosc = 7.37M*40/(2*2) = 80Mhz for 7.37M input clock
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PLLFBD = 41; // M=39
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CLKDIVbits.PLLPOST = 0; // N1=2
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CLKDIVbits.PLLPRE = 0; // N2=2
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OSCTUN = 0;
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// initiate clock switch to FRC with PLL
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__builtin_write_OSCCONH(0x01);
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__builtin_write_OSCCONL(0x01);
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// wait for clock switch to occur
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while (OSCCONbits.COSC != 0x01) {
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}
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while (!OSCCONbits.LOCK) {
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}
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}
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/********************************************************************/
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// LEDs
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#define RED_LED_TRIS _TRISC15
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#define YELLOW_LED_TRIS _TRISC13
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#define GREEN_LED_TRIS _TRISC14
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#define RED_LED _LATC15
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#define YELLOW_LED _LATC13
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#define GREEN_LED _LATC14
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#define LED_ON (0)
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#define LED_OFF (1)
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void led_init(void) {
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// set led GPIO as outputs
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RED_LED_TRIS = 0;
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YELLOW_LED_TRIS = 0;
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GREEN_LED_TRIS = 0;
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// turn off the LEDs
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RED_LED = LED_OFF;
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YELLOW_LED = LED_OFF;
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GREEN_LED = LED_OFF;
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}
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void led_state(int led, int state) {
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int val = state ? LED_ON : LED_OFF;
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switch (led) {
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case 1:
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RED_LED = val;
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break;
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case 2:
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YELLOW_LED = val;
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break;
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case 3:
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GREEN_LED = val;
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break;
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}
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}
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void led_toggle(int led) {
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switch (led) {
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case 1:
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RED_LED ^= 1;
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break;
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case 2:
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YELLOW_LED ^= 1;
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break;
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case 3:
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GREEN_LED ^= 1;
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break;
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}
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}
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/********************************************************************/
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// switches
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#define SWITCH_S1_TRIS _TRISD8
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#define SWITCH_S2_TRIS _TRISD9
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#define SWITCH_S1 _RD8
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#define SWITCH_S2 _RD9
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void switch_init(void) {
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// set switch GPIO as inputs
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SWITCH_S1_TRIS = 1;
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SWITCH_S2_TRIS = 1;
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}
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int switch_get(int sw) {
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int val = 1;
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switch (sw) {
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case 1:
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val = SWITCH_S1;
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break;
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case 2:
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val = SWITCH_S2;
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break;
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}
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return val == 0;
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}
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/********************************************************************/
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// UART
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/*
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// TODO need an irq
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void uart_rx_irq(void) {
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if (c == interrupt_char) {
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2021-05-11 03:53:22 +01:00
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MP_STATE_THREAD(mp_pending_exception) = MP_STATE_PORT(keyboard_interrupt_obj);
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2015-03-28 21:45:40 +00:00
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}
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}
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*/
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void uart_init(void) {
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// baudrate = F_CY / 16 (uxbrg + 1)
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// F_CY = 40MHz for us
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UART1.uxbrg = 64; // 38400 baud
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UART1.uxmode = 1 << 15; // UARTEN
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UART1.uxsta = 1 << 10; // UTXEN
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}
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int uart_rx_any(void) {
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return UART1.uxsta & 1; // URXDA
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}
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int uart_rx_char(void) {
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return UART1.uxrxreg;
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}
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void uart_tx_char(int chr) {
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while (UART1.uxsta & (1 << 9)) {
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// tx fifo is full
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}
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UART1.uxtxreg = chr;
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}
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