Turn on PWM audio output for Olimex SAM7EX256 board.

boards/base/Olimex-SAM7EX256-GE8/board.mk

@@ -6,3 +6,4 @@ include $(GFXLIB)/drivers/gadc/AT91SAM7/gadc_lld.mk
 include $(GFXLIB)/drivers/ginput/dial/GADC/ginput_lld.mk
 include $(GFXLIB)/drivers/ginput/toggle/Pal/ginput_lld.mk
 include $(GFXLIB)/drivers/gaudio/gadc/driver.mk
+include $(GFXLIB)/drivers/gaudio/pwm/driver.mk

boards/base/Olimex-SAM7EX256-GE8/example/halconf.h

@@ -80,7 +80,7 @@
  * @brief   Enables the GPT subsystem.
  */
 #if !defined(HAL_USE_GPT) || defined(__DOXYGEN__)
-#define HAL_USE_GPT                 FALSE
+#define HAL_USE_GPT                 TRUE
 #endif
 
 /**
@@ -116,10 +116,6 @@
  */
 #if !defined(HAL_USE_PWM) || defined(__DOXYGEN__)
 #define HAL_USE_PWM                 TRUE
-#define PWM_USE_PWM1				FALSE
-#define PWM_USE_PWM2				TRUE
-#define PWM_USE_PWM3				FALSE
-#define PWM_USE_PWM4				FALSE
 #endif
 
 /**

boards/base/Olimex-SAM7EX256-GE8/example/mcuconf.h

@@ -52,6 +52,10 @@
 /*
  * PWM driver system settings.
  */
+#define PWM_USE_PWM1				TRUE		// used by audio-out
+#define PWM_USE_PWM2				TRUE		// used by back-light
+#define PWM_USE_PWM3				FALSE
+#define PWM_USE_PWM4				FALSE
 
 /*
  * SERIAL driver system settings.
@@ -69,3 +73,10 @@
 #define AT91SAM7_SPI_USE_SPI1       FALSE
 #define AT91SAM7_SPI0_PRIORITY      (AT91C_AIC_PRIOR_HIGHEST - 1)
 #define AT91SAM7_SPI1_PRIORITY      (AT91C_AIC_PRIOR_HIGHEST - 1)
+
+/*
+ * GPT driver system settings.
+ */
+#define AT91_GPT_USE_TC0                  FALSE			// used internally by ADC driver
+#define AT91_GPT_USE_TC1                  TRUE			// uGFX used for audio-out
+#define AT91_GPT_USE_TC2                  FALSE

boards/base/Olimex-SAM7EX256-GE8/gaudio_play_board.h

@@ -0,0 +1,75 @@
+/*
+ * This file is subject to the terms of the GFX License. If a copy of
+ * the license was not distributed with this file, you can obtain one at:
+ *
+ *              http://ugfx.org/license.html
+ */
+
+#ifndef GAUDIO_PLAY_BOARD_H
+#define GAUDIO_PLAY_BOARD_H
+
+/* Our timer callback */
+static void gptcallback(GPTDriver *gptp) {
+	(void) gptp;
+	gaudio_play_pwm_timer_callbackI();
+}
+
+/* PWM configuration structure. The speaker is on PWM0/PB19 ie PWM1/PIN1 in ChibiOS speak */
+static PWMConfig pwmcfg = {
+  1000000,		/* 1 MHz PWM clock frequency. Ignored as we are using PWM_MCK_DIV_n */
+  1024,			/* PWM period is 1024 cycles (10 bits). */
+  0,
+  {
+   {PWM_MCK_DIV_1 | PWM_OUTPUT_CENTER | PWM_OUTPUT_ACTIVE_HIGH | PWM_OUTPUT_PIN1 | PWM_DISABLEPULLUP_PIN1, 0},
+  },
+};
+
+/* Timer configuration structure. We use Timer 2 (TC1) */
+static GPTConfig gptcfg = {
+  8192,							// frequency
+  gptcallback,					// callback
+  GPT_CLOCK_FREQUENCY,			// clocksource
+  GPT_GATE_NONE,				// clockgate
+  GPT_TRIGGER_NONE,				// trigger
+};
+
+static uint16_t		lastvalue;
+
+static bool gaudio_play_pwm_setup(uint32_t frequency, ArrayDataFormat format) {
+	if (format == ARRAY_DATA_10BITUNSIGNED)
+		pwmcfg.period = 1024;
+	else if (format == ARRAY_DATA_8BITUNSIGNED)
+		pwmcfg.period = 256;
+	else
+		return FALSE;
+	gptcfg.frequency = frequency;
+	return TRUE;
+}
+
+static void gaudio_play_pwm_start(void) {
+	/* Start the PWM */
+	pwmStart(&PWMD1, &pwmcfg);
+	lastvalue = pwmcfg.period>>1;
+	pwmEnableChannelI(&PWMD1, 0, lastvalue);
+
+	/* Start the timer interrupt */
+	gptStart(&GPTD2, &gptcfg);
+	gptStartContinuous(&GPTD2, 0);
+}
+
+static void gaudio_play_pwm_stop(void) {
+	/* Stop the timer interrupt */
+	gptStopTimer(&GPTD2);
+
+	/* Stop the PWM */
+	pwmStop(&PWMD1);
+}
+
+static void gaudio_play_pwm_setI(uint16_t value) {
+	if (value != lastvalue) {
+		lastvalue = value;
+		pwmEnableChannelI(&PWMD1, 0, value);
+	}
+}
+
+#endif	/* GAUDIO_PLAY_BOARD_H */