Plasma: Add support for GPIOs >=32.

For both APA102 and WS2812 the pins used on the same PIO must be in the same range.
The GPIO base offset applies to the whole PIO and not individual state machines.

This means that for APA102 both data and clock must be in the same pin range,
ie: either 16-48 inclusive or 0-31 inclusive.

Author: Gadgetoid

drivers/plasma/apa102.cpp

@@ -4,10 +4,26 @@
 namespace plasma {
 
 APA102::APA102(uint num_leds, PIO pio, uint sm, uint pin_dat, uint pin_clk, uint freq, RGB* buffer) : buffer(buffer), num_leds(num_leds), pio(pio), sm(sm) {
+    // NOTE: This sets the gpio_base for *the entire PIO* not just this state machine
+    uint range_max = std::max(pin_dat, pin_clk);
+    uint range_min = std::min(pin_dat, pin_clk);
+
+    // Both pins in 16-48 range
+    if(range_max >= 32 && range_min >= 16) {
+        pio_set_gpio_base(pio, 16);
+    // Both pins in 0-31 range
+    } else if(range_max <= 31) {
+        pio_set_gpio_base(pio, 0);
+    // Pins in different ranges: invalid combo!
+    } else {
+        // TODO: Need some means to notify the caller
+        pio_set_gpio_base(pio, 0);
+    }
+
     pio_program_offset = pio_add_program(pio, &apa102_program);
 
-    pio_sm_set_pins_with_mask(pio, sm, 0, (1u << pin_clk) | (1u << pin_dat));
-    pio_sm_set_pindirs_with_mask(pio, sm, ~0u, (1u << pin_clk) | (1u << pin_dat));
+    pio_sm_set_pins_with_mask(pio, sm, 0, (1u << (pin_clk - pio_get_gpio_base(pio))) | (1u << (pin_dat - pio_get_gpio_base(pio))));
+    pio_sm_set_pindirs_with_mask(pio, sm, ~0u, (1u << (pin_clk - pio_get_gpio_base(pio))) | (1u << (pin_dat - pio_get_gpio_base(pio))));
     pio_gpio_init(pio, pin_clk);
     pio_gpio_init(pio, pin_dat);
 

drivers/plasma/ws2812.cpp

@@ -4,6 +4,9 @@
 namespace plasma {
 
 WS2812::WS2812(uint num_leds, PIO pio, uint sm, uint pin, uint freq, bool rgbw, COLOR_ORDER color_order, RGB* buffer) : buffer(buffer), num_leds(num_leds), color_order(color_order), pio(pio), sm(sm) {
+    // NOTE: This sets the gpio_base for *the entire PIO* not just this state machine
+    pio_set_gpio_base(pio, pin >= 32 ? 16 : 0);
+
     pio_program_offset = pio_add_program(pio, &ws2812_program);
 
     pio_gpio_init(pio, pin);