Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_ARM_SSG/TARGET_MPS2/SDK/fpga.c
- Revision:
- 18:6a4db94011d3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_ARM_SSG/TARGET_MPS2/SDK/fpga.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,90 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2015 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. + * ---------------------------------------------------------------- + * File: fpga.c + * Release: Version 1.0 + * ---------------------------------------------------------------- + */ + +/* + * Code implementation file for the fpga functions. + */ + +#include "SMM_MPS2.h" // MPS2 common header + +// Function to delay n*ticks (25MHz = 40nS per tick) +// Used for I2C drivers +void i2c_delay(unsigned int tick) +{ + unsigned int end; + unsigned int start; + + start = MPS2_FPGAIO->COUNTER; + end = start + (tick); + + if(end >= start) + { + while (MPS2_FPGAIO->COUNTER >= start && MPS2_FPGAIO->COUNTER < end); + } + else + { + while (MPS2_FPGAIO->COUNTER >= start); + while (MPS2_FPGAIO->COUNTER < end); + } +} + +/* Sleep function to delay n*mS + * Uses FPGA counter. + */ +void Sleepms(unsigned int msec) +{ + unsigned int end; + unsigned int start; + + start = MPS2_FPGAIO->COUNTER; + end = start + (25 * msec * 1000); + + if(end >= start) + { + while (MPS2_FPGAIO->COUNTER >= start && MPS2_FPGAIO->COUNTER < end); + } + else + { + while (MPS2_FPGAIO->COUNTER >= start); + while (MPS2_FPGAIO->COUNTER < end); + } +} + +/* Sleep function to delay n*uS + */ +void Sleepus(unsigned int usec) +{ + unsigned int end; + unsigned int start; + + start = MPS2_FPGAIO->COUNTER; + end = start + (25 * usec); + + if(end >= start) + { + while (MPS2_FPGAIO->COUNTER >= start && MPS2_FPGAIO->COUNTER < end); + } + else + { + while (MPS2_FPGAIO->COUNTER >= start); + while (MPS2_FPGAIO->COUNTER < end); + } +} +