diff options
Diffstat (limited to 'test/powerdemo.c')
| -rw-r--r-- | test/powerdemo.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/test/powerdemo.c b/test/powerdemo.c deleted file mode 100644 index e695bb8e5e..0000000000 --- a/test/powerdemo.c +++ /dev/null @@ -1,181 +0,0 @@ -/* Copyright 2012 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -/* Power state machine demo module for Chrome EC */ - -#include "clock.h" -#include "common.h" -#include "powerdemo.h" -#include "task.h" -#include "timer.h" -#include "registers.h" - -static volatile enum { - POWER_STATE_IDLE = 0, /* Idle */ - POWER_STATE_DOWN1, /* Assert output for 1ms */ - POWER_STATE_UP1, /* Deassert output for 1ms */ - POWER_STATE_DOWN10, /* Assert output for 10ms */ - POWER_STATE_UP5, /* Deassert output for 5ms */ - POWER_STATE_DOWN15, /* Assert output for 15ms */ - POWER_STATE_WAIT, /* Wait for button to be released */ - POWER_STATE_DOWN2 /* Assert output for 2ms */ -} state = POWER_STATE_IDLE; - - -/* Stops the timer. */ -static void __stop_timer(void) -{ - /* Disable timer A */ - LM4_TIMER_CTL(7) &= ~0x01; - /* Clear any pending interrupts */ - LM4_TIMER_ICR(7) = LM4_TIMER_RIS(7); -} - - -/* Starts the timer with the specified delay. If the timer is already - * started, resets it. */ -static void __start_timer(int usec) -{ - /* Stop the timer, if it was started */ - __stop_timer(); - /* Set the delay, counting function overhead */ - LM4_TIMER_TAILR(7) = usec; - /* Start timer A */ - LM4_TIMER_CTL(7) |= 0x01; -} - - -static void __set_state(int new_state, int pin_value, int timeout) -{ - LM4_GPIO_DATA(LM4_GPIO_D, 0x08) = (pin_value ? 0x08 : 0); - if (timeout) - __start_timer(timeout); - else - __stop_timer(); - state = new_state; -} - - -int power_demo_init(void) -{ - volatile uint32_t scratch __attribute__((unused)); - - /* Set up TIMER1 as our state timer */ - /* Enable TIMER1 clock */ - LM4_SYSTEM_RCGCWTIMER |= 0x02; - /* wait 3 clock cycles before using the module */ - scratch = LM4_SYSTEM_RCGCWTIMER; - /* Ensure timer is disabled : TAEN = TBEN = 0 */ - LM4_TIMER_CTL(7) &= ~0x101; - /* 32-bit timer mode */ - LM4_TIMER_CFG(7) = 4; - /* Set the prescaler to increment every microsecond */ - LM4_TIMER_TAPR(7) = clock_get_freq() / SECOND; - /* One-shot, counting down */ - LM4_TIMER_TAMR(7) = 0x01; - /* Set overflow interrupt */ - LM4_TIMER_IMR(7) = 0x1; - - /* Enable clock to GPIO module D */ - LM4_SYSTEM_RCGCGPIO |= 0x0008; - - /* Clear GPIOAFSEL and enable digital function for pins 0-3 */ - LM4_GPIO_AFSEL(LM4_GPIO_D) &= ~0x0f; - LM4_GPIO_DEN(LM4_GPIO_D) |= 0x0f; - - /* Set pins 0-2 as input, pin 3 as output */ - LM4_GPIO_DIR(LM4_GPIO_D) = (LM4_GPIO_DIR(LM4_GPIO_D) & ~0x0f) | 0x08; - - /* Set pin 0 to edge-sensitive, both edges, pull-up */ - LM4_GPIO_IS(LM4_GPIO_D) &= ~0x01; - LM4_GPIO_IBE(LM4_GPIO_D) |= 0x01; - LM4_GPIO_PUR(LM4_GPIO_D) |= 0x01; - - /* Move to idle state */ - __set_state(POWER_STATE_IDLE, 1, 0); - - /* Enable interrupt on pin 0 */ - LM4_GPIO_IM(LM4_GPIO_D) |= 0x01; - - return EC_SUCCESS; -} - - -/* GPIO interrupt handler */ -static void __gpio_d_interrupt(void) -{ - uint32_t mis = LM4_GPIO_MIS(LM4_GPIO_D); - - /* Clear the interrupt bits we're handling */ - LM4_GPIO_ICR(LM4_GPIO_D) = mis; - - /* Handle edges */ - if (mis & 0x01) { - if (LM4_GPIO_DATA(LM4_GPIO_D, 0x01)) { - if (state == POWER_STATE_WAIT) - __set_state(POWER_STATE_DOWN2, 0, 2000 - 28); - } else { - if (state == POWER_STATE_IDLE) - __set_state(POWER_STATE_DOWN1, 0, 1000 - 28); - } - } -} - -DECLARE_IRQ(LM4_IRQ_GPIOD, __gpio_d_interrupt, 1); - - -/* Timer interrupt handler */ -static void __timer_w1_interrupt(void) -{ - uint32_t mis = LM4_TIMER_RIS(7); - /* Clear the interrupt reasons we're handling */ - LM4_TIMER_ICR(7) = mis; - - /* Transition to next state */ - switch (state) { - case POWER_STATE_IDLE: - case POWER_STATE_WAIT: - /* Ignore timer events when waiting for GPIO edges */ - break; - case POWER_STATE_DOWN1: - __set_state(POWER_STATE_UP1, 1, 1000 - 28); - break; - case POWER_STATE_UP1: - __set_state(POWER_STATE_DOWN10, 0, 10000 - 228); - break; - case POWER_STATE_DOWN10: - __set_state(POWER_STATE_UP5, 1, 5000 - 128); - break; - case POWER_STATE_UP5: - __set_state(POWER_STATE_DOWN15, 0, 15000 - 328); - break; - case POWER_STATE_DOWN15: - if (LM4_GPIO_DATA(LM4_GPIO_D, 0x01)) { - /* Button has already been released; go straight to - * idle */ - __set_state(POWER_STATE_IDLE, 1, 0); - } else { - /* Wait for button release */ - __set_state(POWER_STATE_WAIT, 1, 0); - } - break; - case POWER_STATE_DOWN2: - __set_state(POWER_STATE_IDLE, 1, 0); - break; - } -} - -DECLARE_IRQ(LM4_IRQ_TIMERW1A, __timer_w1_interrupt, 1); - -int power_demo_task(void) -{ - /* Initialize the peripherals */ - power_demo_init(); - - /* suspend this task forever */ - task_wait_event(-1); - - return EC_SUCCESS; -} |