1 files changed, 75 insertions, 0 deletions
diff --git a/circuitpython/ports/raspberrypi/common-hal/rgbmatrix/RGBMatrix.c b/circuitpython/ports/raspberrypi/common-hal/rgbmatrix/RGBMatrix.c
new file mode 100644
index 0000000..d580b4c
--- /dev/null
+++ b/circuitpython/ports/raspberrypi/common-hal/rgbmatrix/RGBMatrix.c
@@ -0,0 +1,75 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Jeff Epler for Adafruit Industries
+ *
+ * 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 <stddef.h>
+
+#include "py/mphal.h"
+
+#include "common-hal/rgbmatrix/RGBMatrix.h"
+#include "shared-bindings/pwmio/PWMOut.h"
+#include "shared-module/rgbmatrix/RGBMatrix.h"
+
+#include "src/rp2_common/hardware_pwm/include/hardware/pwm.h"
+#include "src/rp2_common/hardware_irq/include/hardware/irq.h"
+
+void *common_hal_rgbmatrix_timer_allocate(rgbmatrix_rgbmatrix_obj_t *self) {
+    // Choose a PWM channel based on the first RGB pin
+    uint8_t slice = pwm_gpio_to_slice_num(self->rgb_pins[0]);
+    uint8_t channel = pwm_gpio_to_channel(self->rgb_pins[0]);
+    int result = pwmout_allocate(slice, channel, true, 125000000 / 3);
+    if (result == PWMOUT_OK) {
+        // return value must be nonzero (but slice and channel can both be
+        // zero), so set bit 16...
+        pwmout_never_reset(slice, channel);
+        return (void *)(intptr_t)(slice | (channel << 8) | 0x10000);
+    }
+    return NULL;
+}
+
+void common_hal_rgbmatrix_timer_enable(void *ptr) {
+    int8_t slice = ((intptr_t)ptr) & 0xff;
+    pwm_set_enabled(slice, false);
+    pwm_clear_irq(slice);
+    pwm_set_enabled(slice, true);
+}
+
+void common_hal_rgbmatrix_timer_disable(void *ptr) {
+    int8_t slice = ((intptr_t)ptr) & 0xff;
+    pwm_set_enabled(slice, false);
+    irq_set_enabled(PWM_IRQ_WRAP, false);
+    pwm_clear_irq(slice);
+}
+
+void common_hal_rgbmatrix_timer_free(void *ptr) {
+    intptr_t value = (intptr_t)ptr;
+    uint8_t slice = value & 0xff;
+    uint8_t channel = value >> 8;
+    pwm_set_enabled(slice, false);
+    irq_set_enabled(PWM_IRQ_WRAP, false);
+    pwm_clear_irq(slice);
+    pwmout_free(slice, channel);
+    return;
+}