Diff: pwm_timer.c

Revision:

0:cb80470434eb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pwm_timer.c	Tue Oct 28 12:19:42 2014 +0000
@@ -0,0 +1,154 @@
+/*
+ * @brief PWM timer driver
+ *
+ * @note
+ * Copyright (C) Elektor, 2014
+ * All rights reserved.
+ *
+ * @par
+ * This software is supplied "AS IS" without any warranties of any kind,
+ * and Elektor and its licensor disclaim any and all warranties, express
+ * or implied, including all implied warranties of merchantability,
+ * fitness for a particular purpose and non-infringement of intellectual
+ * property rights.  Elektor assumes no responsibility or liability for
+ * the use of the software, conveys no license or rights under any patent,
+ * copyright, mask work right, or any other intellectual property rights in
+ * or to any products. Elektor reserves the right to make changes in the
+ * software without notification. Elektor also makes no representation or
+ * warranty that such application will be suitable for the specified use
+ * without further testing or modification.
+ *
+ * @par
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation is hereby granted, under Elektor's and its licensor's
+ * relevant copyrights in the software, without fee.  This copyright,
+ * permission, and disclaimer notice must appear in all copies of this code.
+ */
+
+#include "board.h"
+#include "pwm_timer.h"
+
+
+#define PWM_TIMER_DUTY_CYCLE_MAX  (1000)
+
+#define LPC_TIMER16_0  ((LPC_TIMER_T*)0)
+#define TIMER_16_0_IRQn  (0)
+#define LPC_TIMER16_1  ((LPC_TIMER_T*)1)
+#define TIMER_16_1_IRQn  (1)
+#define LPC_TIMER32_0  ((LPC_TIMER_T*)2)
+#define TIMER_32_0_IRQn  (2)
+#define LPC_TIMER32_1  ((LPC_TIMER_T*)3)
+#define TIMER_32_1_IRQn  (3)
+
+
+const pwm_timer_t pwm_timers[PWM_TIMERS] =
+{
+	{ // 0
+		LPC_TIMER16_0,
+		TIMER_16_0_IRQn,
+		PWM_TIMER_FREQUENCY_REGISTER,
+		{
+			{ 0, 8, IOCON_FUNC2, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ 0, 9, IOCON_FUNC2, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ 0, 10, IOCON_FUNC3, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ (uint8_t)-1, (uint8_t)-1, (uint32_t)-1, (uint32_t)-1 },
+		},
+	},
+	{ // 1
+		LPC_TIMER16_1,
+		TIMER_16_1_IRQn,
+		PWM_TIMER_FREQUENCY_REGISTER,
+		{
+			{ 0, 21, IOCON_FUNC1, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ 0, 22, IOCON_FUNC2, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ (uint8_t)-1, (uint8_t)-1, (uint32_t)-1, (uint32_t)-1 },
+			{ (uint8_t)-1, (uint8_t)-1, (uint32_t)-1, (uint32_t)-1 },
+		},
+	},
+	{ // 2
+		LPC_TIMER32_0,
+		TIMER_32_0_IRQn,
+		PWM_TIMER_FREQUENCY_REGISTER,
+		{
+			{ 0, 18, IOCON_FUNC2, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ 0, 19, IOCON_FUNC2, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ 0,  1, IOCON_FUNC2, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ 1, 27, IOCON_FUNC1, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+		},
+	},
+	{ // 3
+		LPC_TIMER32_1,
+		TIMER_32_1_IRQn,
+		PWM_TIMER_FREQUENCY_REGISTER,
+		{
+			{ 0, 13, IOCON_FUNC3, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ 0, 14, IOCON_FUNC3, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ 0, 15, IOCON_FUNC3, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+			{ 0, 16, IOCON_FUNC2, PWM_TIMER_DEFAULT_DUTY_CYCLE },
+		},
+	}
+};
+
+
+void PwmTimer_Init(const pwm_timer_t *p_timer, uint32_t frequency)
+{
+	// Setup timer.
+	//Chip_TIMER_Init(p_timer->timer);
+	//Chip_TIMER_Reset(p_timer->timer);
+	// Register the MRx register that will determine the frequency.
+	//Chip_TIMER_ResetOnMatchEnable(p_timer->timer,p_timer->frequency_register);
+	// Load the frequency register.
+	PwmTimer_SetFrequency(p_timer,frequency);
+	//PwmTimer_Start(p_timer->timer);
+}
+
+
+void PwmTimer_InitChannel(const pwm_timer_t *p_timer, uint8_t channel, uint32_t duty_cycle)
+{
+	// Setup pin multiplexer.
+	//Chip_IOCON_PinMuxSet(LPC_IOCON,p_timer->channel[channel].port,p_timer->channel[channel].pin,IOCON_DIGMODE_EN|IOCON_MODE_INACT|p_timer->channel[channel].function);
+	// Make the pin an output.
+	//Chip_GPIO_WriteDirBit(LPC_GPIO_PORT,p_timer->channel[channel].port,p_timer->channel[channel].pin,OUTPUT);
+
+	// Activate PWM mode on the duty-cycle register.
+	// CPV 09042014: for some reason the LPCOpen library doesn't know about the PWMC register,
+	//               so I added it myself.
+	//p_timer->timer->PWMC |= 1 << channel;
+	PwmTimer_SetDutyCycle(p_timer,channel,duty_cycle);
+}
+
+
+void PwmTimer_SetFrequency(const pwm_timer_t *p_timer, uint32_t frequency)
+{
+	//Chip_TIMER_SetMatch(p_timer->timer,p_timer->frequency_register,Chip_Clock_GetSystemClockRate()/frequency);
+}
+
+
+void PwmTimer_SetDutyCycle(const pwm_timer_t *p_timer, uint8_t channel, uint32_t duty_cycle)
+{
+	if (duty_cycle>PWM_TIMER_DUTY_CYCLE_MAX) duty_cycle = PWM_TIMER_DUTY_CYCLE_MAX;
+	//Chip_TIMER_SetMatch(p_timer->timer,channel,duty_cycle*p_timer->timer->MR[p_timer->frequency_register]/PWM_TIMER_DUTY_CYCLE_MAX);
+}
+
+
+void PwmTimer_Start(const pwm_timer_t *p_timer)
+{
+	//Chip_TIMER_Enable(p_timer->timer);
+}
+
+
+void PwmTimer_Stop(const pwm_timer_t *p_timer)
+{
+	//Chip_TIMER_Disable(p_timer->timer);
+}
+
+
+void PwmTimer_EnableInterrupt(const pwm_timer_t *p_timer, uint8_t channel)
+{
+	// Select the match register that will generate interrupts.
+	//Chip_TIMER_MatchEnableInt(p_timer->timer,channel);
+	// Enable timer interrupt.
+	//NVIC_ClearPendingIRQ(p_timer->irq);
+	//NVIC_EnableIRQ(p_timer->irq);
+}
+