MacroRat / MouseCode

Mouse code for the MacroRat

Dependencies:   ITG3200 QEI

mbed-dev/targets/TARGET_ARM_SSG/TARGET_BEETLE/analogin_api.c@18:6a4db94011d3, 2017-05-14 (annotated)

Committer:
sahilmgandhi
Date:
Sun May 14 23:18:57 2017 +0000
Revision:
18:6a4db94011d3
Publishing again

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sahilmgandhi 18:6a4db94011d3 1 /*
sahilmgandhi 18:6a4db94011d3 2 * PackageLicenseDeclared: Apache-2.0
sahilmgandhi 18:6a4db94011d3 3 * Copyright (c) 2016 ARM Limited
sahilmgandhi 18:6a4db94011d3 4 *
sahilmgandhi 18:6a4db94011d3 5 * Licensed under the Apache License, Version 2.0 (the "License");
sahilmgandhi 18:6a4db94011d3 6 * you may not use this file except in compliance with the License.
sahilmgandhi 18:6a4db94011d3 7 * You may obtain a copy of the License at
sahilmgandhi 18:6a4db94011d3 8 *
sahilmgandhi 18:6a4db94011d3 9 * http://www.apache.org/licenses/LICENSE-2.0
sahilmgandhi 18:6a4db94011d3 10 *
sahilmgandhi 18:6a4db94011d3 11 * Unless required by applicable law or agreed to in writing, software
sahilmgandhi 18:6a4db94011d3 12 * distributed under the License is distributed on an "AS IS" BASIS,
sahilmgandhi 18:6a4db94011d3 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
sahilmgandhi 18:6a4db94011d3 14 * See the License for the specific language governing permissions and
sahilmgandhi 18:6a4db94011d3 15 * limitations under the License.
sahilmgandhi 18:6a4db94011d3 16 */
sahilmgandhi 18:6a4db94011d3 17 #include "cmsis.h"
sahilmgandhi 18:6a4db94011d3 18 #include "mbed_assert.h"
sahilmgandhi 18:6a4db94011d3 19 #include "mbed_wait_api.h"
sahilmgandhi 18:6a4db94011d3 20 #include "analogin_api.h"
sahilmgandhi 18:6a4db94011d3 21 #include "gpio_api.h"
sahilmgandhi 18:6a4db94011d3 22 #include "spi_api.h"
sahilmgandhi 18:6a4db94011d3 23 #include "pinmap.h"
sahilmgandhi 18:6a4db94011d3 24
sahilmgandhi 18:6a4db94011d3 25 #if DEVICE_ANALOGIN
sahilmgandhi 18:6a4db94011d3 26
sahilmgandhi 18:6a4db94011d3 27 /*
sahilmgandhi 18:6a4db94011d3 28 * Channel Address for the next acquisition:
sahilmgandhi 18:6a4db94011d3 29 * XXAAAXXX XXXXXXXX
sahilmgandhi 18:6a4db94011d3 30 */
sahilmgandhi 18:6a4db94011d3 31 #define ADC_SPI_ADDRESS 11
sahilmgandhi 18:6a4db94011d3 32
sahilmgandhi 18:6a4db94011d3 33 /* ADC Resolution */
sahilmgandhi 18:6a4db94011d3 34 #define ADC_RESOLUTION 0xFFF
sahilmgandhi 18:6a4db94011d3 35
sahilmgandhi 18:6a4db94011d3 36 /* ADC Voltage Divider */
sahilmgandhi 18:6a4db94011d3 37 #define ADC_DIV 819.0
sahilmgandhi 18:6a4db94011d3 38
sahilmgandhi 18:6a4db94011d3 39 /* PinMap structure for ADC IN */
sahilmgandhi 18:6a4db94011d3 40 static const PinMap PinMap_ADC[] = {
sahilmgandhi 18:6a4db94011d3 41 {A0, ADC0_0, 0},
sahilmgandhi 18:6a4db94011d3 42 {A1, ADC0_1, 0},
sahilmgandhi 18:6a4db94011d3 43 {A2, ADC0_2, 0},
sahilmgandhi 18:6a4db94011d3 44 {A3, ADC0_3, 0},
sahilmgandhi 18:6a4db94011d3 45 {A4, ADC0_4, 0},
sahilmgandhi 18:6a4db94011d3 46 {A5, ADC0_5, 0},
sahilmgandhi 18:6a4db94011d3 47 {NC, NC, 0}
sahilmgandhi 18:6a4db94011d3 48 };
sahilmgandhi 18:6a4db94011d3 49
sahilmgandhi 18:6a4db94011d3 50 /* ADC SPI Private Data */
sahilmgandhi 18:6a4db94011d3 51 typedef struct {
sahilmgandhi 18:6a4db94011d3 52 /* ADC SPI */
sahilmgandhi 18:6a4db94011d3 53 spi_t analogin_spi;
sahilmgandhi 18:6a4db94011d3 54 /* ADC SPI CS */
sahilmgandhi 18:6a4db94011d3 55 gpio_t adc_spi_cs_gpio;
sahilmgandhi 18:6a4db94011d3 56 /* ADC SPI State */
sahilmgandhi 18:6a4db94011d3 57 uint32_t analog_spi_inited;
sahilmgandhi 18:6a4db94011d3 58 } analogin_spi_t;
sahilmgandhi 18:6a4db94011d3 59 /* ADC SPI Device */
sahilmgandhi 18:6a4db94011d3 60 static analogin_spi_t analogin_spi_dev;
sahilmgandhi 18:6a4db94011d3 61
sahilmgandhi 18:6a4db94011d3 62 /*
sahilmgandhi 18:6a4db94011d3 63 * ADC SPI CS
sahilmgandhi 18:6a4db94011d3 64 */
sahilmgandhi 18:6a4db94011d3 65 #define ADC_SPI_CS P1_2
sahilmgandhi 18:6a4db94011d3 66
sahilmgandhi 18:6a4db94011d3 67 /*
sahilmgandhi 18:6a4db94011d3 68 * Initialize the analogin peripheral
sahilmgandhi 18:6a4db94011d3 69 * Configures the pin used by analogin.
sahilmgandhi 18:6a4db94011d3 70 * obj: The analogin object to initialize
sahilmgandhi 18:6a4db94011d3 71 * pin: The analogin pin name
sahilmgandhi 18:6a4db94011d3 72 */
sahilmgandhi 18:6a4db94011d3 73 void analogin_init(analogin_t *obj, PinName pin)
sahilmgandhi 18:6a4db94011d3 74 {
sahilmgandhi 18:6a4db94011d3 75 /* Initialize ADC Pin */
sahilmgandhi 18:6a4db94011d3 76 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
sahilmgandhi 18:6a4db94011d3 77 /* Verify if pin is valid */
sahilmgandhi 18:6a4db94011d3 78 MBED_ASSERT(obj->adc != (ADCName)NC);
sahilmgandhi 18:6a4db94011d3 79
sahilmgandhi 18:6a4db94011d3 80 /* Initialize the ADC SPI */
sahilmgandhi 18:6a4db94011d3 81 if(analogin_spi_dev.analog_spi_inited == 0){
sahilmgandhi 18:6a4db94011d3 82 /* Initialize SPI for ADC */
sahilmgandhi 18:6a4db94011d3 83 spi_init(&(analogin_spi_dev.analogin_spi), ADC_SPI_MOSI,
sahilmgandhi 18:6a4db94011d3 84 ADC_SPI_MISO, ADC_SPI_SCK, ADC_SPI_nCS);
sahilmgandhi 18:6a4db94011d3 85 spi_format(&(analogin_spi_dev.analogin_spi), 16, 3, 0);
sahilmgandhi 18:6a4db94011d3 86 /* Set SPI to MAX Freq */
sahilmgandhi 18:6a4db94011d3 87 spi_frequency(&(analogin_spi_dev.analogin_spi), 0);
sahilmgandhi 18:6a4db94011d3 88
sahilmgandhi 18:6a4db94011d3 89 /* Initialize CS GPIO */
sahilmgandhi 18:6a4db94011d3 90 gpio_init_out(&(analogin_spi_dev.adc_spi_cs_gpio), ADC_SPI_CS);
sahilmgandhi 18:6a4db94011d3 91
sahilmgandhi 18:6a4db94011d3 92 analogin_spi_dev.analog_spi_inited = 1;
sahilmgandhi 18:6a4db94011d3 93 }
sahilmgandhi 18:6a4db94011d3 94
sahilmgandhi 18:6a4db94011d3 95 /* If pin is valid assign it to the ADC data structure */
sahilmgandhi 18:6a4db94011d3 96 obj->pin = pin;
sahilmgandhi 18:6a4db94011d3 97 obj->pin_number = pin-600;
sahilmgandhi 18:6a4db94011d3 98 obj->address = (0x0000 | (pin-600));
sahilmgandhi 18:6a4db94011d3 99
sahilmgandhi 18:6a4db94011d3 100 /* Configure the pinout */
sahilmgandhi 18:6a4db94011d3 101 pinmap_pinout(pin, PinMap_ADC);
sahilmgandhi 18:6a4db94011d3 102 }
sahilmgandhi 18:6a4db94011d3 103
sahilmgandhi 18:6a4db94011d3 104 /*
sahilmgandhi 18:6a4db94011d3 105 * Read the value from analogin pin, represented as an unsigned 16bit value
sahilmgandhi 18:6a4db94011d3 106 * obj: The analogin object
sahilmgandhi 18:6a4db94011d3 107 * @return: An unsigned 16bit value representing the current input voltage
sahilmgandhi 18:6a4db94011d3 108 */
sahilmgandhi 18:6a4db94011d3 109 uint16_t analogin_read_u16(analogin_t *obj)
sahilmgandhi 18:6a4db94011d3 110 {
sahilmgandhi 18:6a4db94011d3 111 uint16_t result = 0;
sahilmgandhi 18:6a4db94011d3 112
sahilmgandhi 18:6a4db94011d3 113 /*
sahilmgandhi 18:6a4db94011d3 114 * The ADC SPI hw is 8 bit format, 16 bit emulation is required
sahilmgandhi 18:6a4db94011d3 115 * in the SPI driver.
sahilmgandhi 18:6a4db94011d3 116 */
sahilmgandhi 18:6a4db94011d3 117 /* CS = 1 */
sahilmgandhi 18:6a4db94011d3 118 gpio_write(&(analogin_spi_dev.adc_spi_cs_gpio), 1);
sahilmgandhi 18:6a4db94011d3 119 /* Do the first read */
sahilmgandhi 18:6a4db94011d3 120 (void)spi_master_write(&(analogin_spi_dev.analogin_spi),
sahilmgandhi 18:6a4db94011d3 121 ((obj->pin_number) << ADC_SPI_ADDRESS));
sahilmgandhi 18:6a4db94011d3 122 /* CS = 0 */
sahilmgandhi 18:6a4db94011d3 123 gpio_write(&(analogin_spi_dev.adc_spi_cs_gpio), 0);
sahilmgandhi 18:6a4db94011d3 124 /* Wait 50 us */
sahilmgandhi 18:6a4db94011d3 125 wait_us(50);
sahilmgandhi 18:6a4db94011d3 126 /* CS = 1 */
sahilmgandhi 18:6a4db94011d3 127 gpio_write(&(analogin_spi_dev.adc_spi_cs_gpio), 1);
sahilmgandhi 18:6a4db94011d3 128 /* The second read provides the result */
sahilmgandhi 18:6a4db94011d3 129 result = spi_master_write(&(analogin_spi_dev.analogin_spi),
sahilmgandhi 18:6a4db94011d3 130 ((obj->pin_number) << ADC_SPI_ADDRESS));
sahilmgandhi 18:6a4db94011d3 131 /* CS = 0 */
sahilmgandhi 18:6a4db94011d3 132 gpio_write(&(analogin_spi_dev.adc_spi_cs_gpio), 0);
sahilmgandhi 18:6a4db94011d3 133
sahilmgandhi 18:6a4db94011d3 134 return result;
sahilmgandhi 18:6a4db94011d3 135 }
sahilmgandhi 18:6a4db94011d3 136
sahilmgandhi 18:6a4db94011d3 137 /*
sahilmgandhi 18:6a4db94011d3 138 * Read the input voltage, represented as a float in the range [0.0, 1.0]
sahilmgandhi 18:6a4db94011d3 139 * obj: The analogin object
sahilmgandhi 18:6a4db94011d3 140 * @return: A floating value representing the current input voltage
sahilmgandhi 18:6a4db94011d3 141 */
sahilmgandhi 18:6a4db94011d3 142 float analogin_read(analogin_t *obj)
sahilmgandhi 18:6a4db94011d3 143 {
sahilmgandhi 18:6a4db94011d3 144 uint16_t result = analogin_read_u16(obj);
sahilmgandhi 18:6a4db94011d3 145 return (float)((result & ADC_RESOLUTION) * 1.0f) / ADC_DIV;
sahilmgandhi 18:6a4db94011d3 146 }
sahilmgandhi 18:6a4db94011d3 147
sahilmgandhi 18:6a4db94011d3 148 #endif