Diff: targets/TARGET_Atmel/TARGET_SAM_CortexM0P/analogin_api.c

Revision:

149:156823d33999

Parent:

64:41a834223ea3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Atmel/TARGET_SAM_CortexM0P/analogin_api.c	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,227 @@
+/* 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.
+ */
+#include "mbed_assert.h"
+#include "analogin_api.h"
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "PeripheralPins.h"
+#include "adc.h"
+#include "status_codes.h"
+
+extern uint8_t g_sys_init;
+struct adc_module adc_instance;
+
+void adc_configure_ain_pin(uint32_t pin)
+{
+#define PIN_INVALID_ADC_AIN    0xFFFFUL
+
+    /* Pinmapping table for AINxx -> GPIO pin number */
+    const uint32_t pinmapping[] = {
+#if (SAMD20E | SAMD21E)
+        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
+        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
+        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
+#elif (SAMD20G | SAMD21G)
+        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
+        PIN_PB08B_ADC_AIN2,  PIN_PB09B_ADC_AIN3,
+        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
+        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
+        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
+#elif (SAMD20J | SAMD21J)
+        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
+        PIN_PB08B_ADC_AIN2,  PIN_PB09B_ADC_AIN3,
+        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
+        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
+        PIN_PB00B_ADC_AIN8,  PIN_PB01B_ADC_AIN9,
+        PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11,
+        PIN_PB04B_ADC_AIN12, PIN_PB05B_ADC_AIN13,
+        PIN_PB06B_ADC_AIN14, PIN_PB07B_ADC_AIN15,
+        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
+        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
+#elif SAMR21E
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+#elif SAMR21G
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PB08B_ADC_AIN2,  PIN_PB09B_ADC_AIN3,
+        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
+        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
+        PIN_PB00B_ADC_AIN8,  PIN_INVALID_ADC_AIN,
+        PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
+        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
+#elif (SAMD10C | SAMD11C)
+        PIN_PA02B_ADC_AIN0,  PIN_INVALID_ADC_AIN,
+        PIN_PA04B_ADC_AIN2,  PIN_PA05B_ADC_AIN3,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA14B_ADC_AIN6,  PIN_PA15B_ADC_AIN7,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+#elif (SAMD10DS | SAMD11DS)
+        PIN_PA02B_ADC_AIN0,  PIN_INVALID_ADC_AIN,
+        PIN_PA04B_ADC_AIN2,  PIN_PA05B_ADC_AIN3,
+        PIN_PA06B_ADC_AIN4,  PIN_PA07B_ADC_AIN5,
+        PIN_PA14B_ADC_AIN6,  PIN_PA15B_ADC_AIN7,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+#elif (SAMD10DM | SAMD11DM)
+        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
+        PIN_PA04B_ADC_AIN2,  PIN_PA05B_ADC_AIN3,
+        PIN_PA06B_ADC_AIN4,  PIN_PA07B_ADC_AIN5,
+        PIN_PA14B_ADC_AIN6,  PIN_PA15B_ADC_AIN7,
+        PIN_PA10B_ADC_AIN8,  PIN_PA11B_ADC_AIN9,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+#elif (SAML21E)
+        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
+        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
+        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+#elif (SAML21G)
+        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
+        PIN_PB08B_ADC_AIN2,  PIN_PB09B_ADC_AIN3,
+        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
+        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
+        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+#elif (SAML21J)
+        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
+        PIN_PB08B_ADC_AIN2,  PIN_PB09B_ADC_AIN3,
+        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
+        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
+        PIN_PB00B_ADC_AIN8,  PIN_PB01B_ADC_AIN9,
+        PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11,
+        PIN_PB04B_ADC_AIN12, PIN_PB05B_ADC_AIN13,
+        PIN_PB06B_ADC_AIN14, PIN_PB07B_ADC_AIN15,
+        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
+        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
+#else
+#  error ADC pin mappings are not defined for this device.
+#endif
+    };
+
+    uint32_t pin_map_result = PIN_INVALID_ADC_AIN;
+
+    if (pin <= ADC_EXTCHANNEL_MSB) {
+        pin_map_result = pinmapping[pin >> ADC_INPUTCTRL_MUXPOS_Pos];
+
+        Assert(pin_map_result != PIN_INVALID_ADC_AIN);
+
+        struct system_pinmux_config config;
+        system_pinmux_get_config_defaults(&config);
+
+        /* Analog functions are all on MUX setting B */
+        config.input_pull   = SYSTEM_PINMUX_PIN_PULL_NONE;
+        config.mux_position = 1;
+
+        system_pinmux_pin_set_config(pin_map_result, &config);
+    }
+}
+
+void analogin_init(analogin_t *obj, PinName pin)
+{
+    MBED_ASSERT(obj);
+    if (g_sys_init == 0) {
+        system_init();
+        g_sys_init = 1;
+    }
+    uint32_t pos_input;
+    static uint8_t init_flag = 0;
+
+    pos_input = pinmap_find_peripheral(pin, PinMap_ADC);
+    MBED_ASSERT(pos_input != (uint32_t)NC);
+
+    adc_get_config_defaults(&(obj->config_adc));
+    obj->config_adc.positive_input = (enum adc_positive_input)pos_input;
+    if (init_flag == 0) {  // ADC init and enable to be done only once.
+        adc_init(&adc_instance, ADC, &(obj->config_adc));
+        adc_enable(&adc_instance);
+        init_flag = 1;
+    }
+    adc_configure_ain_pin(obj->config_adc.positive_input);
+    adc_configure_ain_pin(obj->config_adc.negative_input);
+}
+
+uint16_t analogin_read_u16(analogin_t *obj)
+{
+    MBED_ASSERT(obj);
+    uint16_t result;
+    adc_set_positive_input(&adc_instance, obj->config_adc.positive_input);
+    adc_set_negative_input(&adc_instance, obj->config_adc.negative_input);
+    adc_start_conversion(&adc_instance);
+    do {
+    } while(adc_read(&(adc_instance), &result) == STATUS_BUSY);   // 12 bit value
+
+    return (uint16_t)(((uint32_t)result * 0xFFFF) / 0x0FFF);  // for normalizing to 16 bit value
+}
+
+float analogin_read(analogin_t *obj)
+{
+    MBED_ASSERT(obj);
+    uint16_t value = analogin_read_u16(obj);
+    return (float)value * (1.0f / (float)0xFFFF);
+}
+