Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_NXP/TARGET_LPC43XX/analogout_api.c
- Revision:
- 18:6a4db94011d3
diff -r f713758f6238 -r 6a4db94011d3 mbed-dev/targets/TARGET_NXP/TARGET_LPC43XX/analogout_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_NXP/TARGET_LPC43XX/analogout_api.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,86 @@ +/* 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. + * + * Ported to NXP LPC43XX by Micromint USA <support@micromint.com> + */ +#include "mbed_assert.h" +#include "analogout_api.h" + +#include "cmsis.h" +#include "pinmap.h" +#include "mbed_error.h" +#include "gpio_api.h" + +static const PinMap PinMap_DAC[] = { +#ifdef TARGET_LPC4337 + {P4_3, DAC_0, 0}, +#else + {P4_4, DAC_0, 0}, +#endif + {NC, NC, 0} +}; + +void analogout_init(dac_t *obj, PinName pin) { + obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC); + MBED_ASSERT(obj->dac != (DACName)NC); + + // Reset pin function to GPIO + gpio_set(pin); + // Select DAC on analog function select register in SCU + LPC_SCU->ENAIO[2] |= 1; // Sets pin as DAC + + // Set bias=0 for maximum DAC update rate (1 MHz) + LPC_DAC->CR &= ~DAC_BIAS_EN; + // Enable DAC and DMA + LPC_DAC->CTRL |= DAC_DMA_ENA; + + analogout_write_u16(obj, 0); +} + +void analogout_free(dac_t *obj) {} + +static inline void dac_write(int value) { + + // Set the DAC output + LPC_DAC->CR = DAC_SET(value); +} + +static inline int dac_read() { + return (DAC_GET(LPC_DAC->CR)); +} + +void analogout_write(dac_t *obj, float value) { + if (value < 0.0f) { + dac_write(0); + } else if (value > 1.0f) { + dac_write(DAC_RANGE); + } else { + dac_write(value * (float)DAC_RANGE); + } +} + +void analogout_write_u16(dac_t *obj, uint16_t value) { + dac_write(value >> 6); // 10-bit +} + +float analogout_read(dac_t *obj) { + uint32_t value = dac_read(); + return (float)value * (1.0f / (float)DAC_RANGE); +} + +uint16_t analogout_read_u16(dac_t *obj) { + uint32_t value = dac_read(); // 10-bit + return (value << 6) | ((value >> 4) & 0x003F); +}