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Diffstat (limited to 'platforms/avr/drivers/ps2/ps2_io.c')
-rw-r--r--platforms/avr/drivers/ps2/ps2_io.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/platforms/avr/drivers/ps2/ps2_io.c b/platforms/avr/drivers/ps2/ps2_io.c
new file mode 100644
index 0000000000..7c826fbf1a
--- /dev/null
+++ b/platforms/avr/drivers/ps2/ps2_io.c
@@ -0,0 +1,51 @@
+#include <stdbool.h>
+#include "ps2_io.h"
+#include "gpio.h"
+#include "wait.h"
+
+/* Check port settings for clock and data line */
+#if !(defined(PS2_CLOCK_PIN))
+# error "PS/2 clock setting is required in config.h"
+#endif
+
+#if !(defined(PS2_DATA_PIN))
+# error "PS/2 data setting is required in config.h"
+#endif
+
+/*
+ * Clock
+ */
+void clock_init(void) {}
+
+void clock_lo(void) {
+ // Transition from input with pull-up to output low via Hi-Z instead of output high
+ writePinLow(PS2_CLOCK_PIN);
+ setPinOutput(PS2_CLOCK_PIN);
+}
+
+void clock_hi(void) { setPinInputHigh(PS2_CLOCK_PIN); }
+
+bool clock_in(void) {
+ setPinInputHigh(PS2_CLOCK_PIN);
+ wait_us(1);
+ return readPin(PS2_CLOCK_PIN);
+}
+
+/*
+ * Data
+ */
+void data_init(void) {}
+
+void data_lo(void) {
+ // Transition from input with pull-up to output low via Hi-Z instead of output high
+ writePinLow(PS2_DATA_PIN);
+ setPinOutput(PS2_DATA_PIN);
+}
+
+void data_hi(void) { setPinInputHigh(PS2_DATA_PIN); }
+
+bool data_in(void) {
+ setPinInputHigh(PS2_DATA_PIN);
+ wait_us(1);
+ return readPin(PS2_DATA_PIN);
+}