diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC15XX/us_ticker.c')
-rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC15XX/us_ticker.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC15XX/us_ticker.c b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC15XX/us_ticker.c new file mode 100644 index 0000000000..a4ad2d0039 --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC15XX/us_ticker.c @@ -0,0 +1,73 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include <stddef.h> +#include "us_ticker_api.h" +#include "PeripheralNames.h" + +#define US_TICKER_TIMER_IRQn RIT_IRQn + +int us_ticker_inited = 0; + +void us_ticker_init(void) { + if (us_ticker_inited) return; + us_ticker_inited = 1; + + // Enable the RIT clock + LPC_SYSCON->SYSAHBCLKCTRL1 |= (1 << 1); + + // Clear peripheral reset the RIT + LPC_SYSCON->PRESETCTRL1 |= (1 << 1); + LPC_SYSCON->PRESETCTRL1 &= ~(1 << 1); + + LPC_RIT->MASK = 0; + LPC_RIT->MASK_H = 0; + + LPC_RIT->COUNTER = 0; + LPC_RIT->COUNTER_H = 0; + + LPC_RIT->COMPVAL = 0xffffffff; + LPC_RIT->COMPVAL_H = 0x0000ffff; + + // Timer enable, enable for debug + LPC_RIT->CTRL = 0xC; + + NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); + NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); +} + +uint32_t us_ticker_read() { + if (!us_ticker_inited) + us_ticker_init(); + + uint64_t temp; + temp = LPC_RIT->COUNTER | ((uint64_t)LPC_RIT->COUNTER_H << 32); + temp /= (SystemCoreClock/1000000); + return (uint32_t)temp; +} + +void us_ticker_set_interrupt(timestamp_t timestamp) { + uint64_t temp = ((uint64_t)timestamp * (SystemCoreClock/1000000)); + LPC_RIT->COMPVAL = (temp & 0xFFFFFFFFL); + LPC_RIT->COMPVAL_H = ((temp >> 32)& 0x0000FFFFL); +} + +void us_ticker_disable_interrupt(void) { + LPC_RIT->CTRL |= (1 << 3); +} + +void us_ticker_clear_interrupt(void) { + LPC_RIT->CTRL |= (1 << 0); +} |