nrf5/hal: Starting implementation of PWM hal to be used by PWM python module later.

nrf5/hal/hal_pwm.c

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+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Glenn Ruben Bakke
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+
+#include "mphalport.h"
+#include "hal_pwm.h"
+
+#ifdef HAL_PWM_MODULE_ENABLED
+
+#define PWM_COUNTER_TOP 16000 // 16MHz divided by 16000-> 1ms
+
+volatile uint16_t g_pwm_seq[4];
+
+void hal_pwm_init(NRF_PWM_Type * p_instance, hal_pwm_init_t const * p_pwm_init) {
+
+    uint16_t duty_cycle = ((PWM_COUNTER_TOP*50)/100);
+
+    g_pwm_seq[0] = duty_cycle;
+    g_pwm_seq[1] = duty_cycle;
+    g_pwm_seq[2] = 0;
+    g_pwm_seq[3] = 0;
+
+    p_instance->PSEL.OUT[0] = (p_pwm_init->pwm_pin << PWM_PSEL_OUT_PIN_Pos)
+    		                | (PWM_PSEL_OUT_CONNECT_Connected << PWM_PSEL_OUT_CONNECT_Pos);
+
+    p_instance->ENABLE      = (PWM_ENABLE_ENABLE_Enabled << PWM_ENABLE_ENABLE_Pos);
+    p_instance->MODE        = (PWM_MODE_UPDOWN_Up << PWM_MODE_UPDOWN_Pos);
+    p_instance->PRESCALER   = (PWM_PRESCALER_PRESCALER_DIV_1 << PWM_PRESCALER_PRESCALER_Pos);
+    p_instance->COUNTERTOP  = (PWM_COUNTER_TOP << PWM_COUNTERTOP_COUNTERTOP_Pos); //1 msec
+    p_instance->LOOP        = (PWM_LOOP_CNT_Disabled << PWM_LOOP_CNT_Pos);
+    p_instance->DECODER     = (PWM_DECODER_LOAD_Individual << PWM_DECODER_LOAD_Pos)
+                            | (PWM_DECODER_MODE_RefreshCount << PWM_DECODER_MODE_Pos);
+    p_instance->SEQ[0].PTR  = ((uint32_t)(g_pwm_seq) << PWM_SEQ_PTR_PTR_Pos);
+    p_instance->SEQ[0].CNT  = ((sizeof(g_pwm_seq) / sizeof(uint16_t)) << PWM_SEQ_CNT_CNT_Pos);
+
+    p_instance->SEQ[0].REFRESH    = 0;
+    p_instance->SEQ[0].ENDDELAY   = 0;
+    p_instance->TASKS_SEQSTART[0] = 1;
+}
+
+#endif // HAL_PWM_MODULE_ENABLED

nrf5/hal/hal_pwm.h

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+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Glenn Ruben Bakke
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef HAL_PWM_H__
+#define HAL_PWM_H__
+
+#include <stdint.h>
+
+#include "nrf.h"
+
+#if NRF51
+
+// TODO: create software PWM.
+
+#elif NRF52
+
+#define PWM0  ((NRF_PWM_Type *)NRF_PWM0_BASE)
+#define PWM0_IRQ_NUM PWM1_IRQn
+#define PWM1  ((NRF_PWM_Type *)NRF_PWM1_BASE)
+#define PWM1_IRQ_NUM PWM1_IRQn
+#define PWM2  ((NRF_PWM_Type *)NRF_PWM2_BASE)
+#define PWM2_IRQ_NUM PWM2_IRQn
+
+#if 0 // TODO: nrf52840
+#define PWM3  ((NRF_PWM_Type *)NRF_PWM3_BASE)
+#define PWM3_IRQ_NUM PWM3_IRQn
+#endif
+
+#else
+#error "Device not supported."
+#endif
+
+
+typedef struct {
+    uint8_t pwm_pin;
+} hal_pwm_init_t;
+
+#endif // HAL_PWM_H__