1 files changed, 63 insertions, 0 deletions
diff --git a/keyboards/xd84/pca9555.c b/keyboards/xd84/pca9555.c
new file mode 100644
index 000000000..df4631e9d
--- /dev/null
+++ b/keyboards/xd84/pca9555.c
@@ -0,0 +1,63 @@
+#include "i2c_master.h"
+#include "pca9555.h"
+
+#include "debug.h"
+
+#define SLAVE_TO_ADDR(n)   (n<<1)
+#define TIMEOUT 100
+
+enum {
+  CMD_INPUT_0 = 0,
+  CMD_INPUT_1,
+  CMD_OUTPUT_0,
+  CMD_OUTPUT_1,
+  CMD_INVERSION_0,
+  CMD_INVERSION_1,
+  CMD_CONFIG_0,
+  CMD_CONFIG_1
+};
+
+void pca9555_init(uint8_t slave_addr) {
+  static uint8_t s_init = 0;
+  if (!s_init) {
+    i2c_init();
+
+    s_init=1;
+  }
+
+  // TODO: could check device connected
+  //i2c_start(SLAVE_TO_ADDR(slave) | I2C_WRITE);
+  //i2c_stop();
+}
+
+void pca9555_set_config(uint8_t slave_addr, uint8_t port, uint8_t conf) {
+  uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+  uint8_t cmd = port ? CMD_OUTPUT_1 : CMD_OUTPUT_0;
+
+  i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
+  if (ret != I2C_STATUS_SUCCESS) {
+    print("pca9555_set_config::FAILED\n");
+  }
+}
+
+void pca9555_set_output(uint8_t slave_addr, uint8_t port, uint8_t conf) {
+  uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+  uint8_t cmd = port ? CMD_CONFIG_1 : CMD_CONFIG_0;
+
+  i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
+  if (ret != I2C_STATUS_SUCCESS) {
+    print("pca9555_set_output::FAILED\n");
+  }
+}
+
+uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port) {
+  uint8_t addr = SLAVE_TO_ADDR(slave_addr);
+  uint8_t cmd = port ? CMD_INPUT_1 : CMD_INPUT_0;
+
+  uint8_t data = 0;
+  i2c_status_t ret = i2c_readReg(addr, cmd, &data, sizeof(data), TIMEOUT);
+  if (ret != I2C_STATUS_SUCCESS) {
+    print("pca9555_readPins::FAILED\n");
+  }
+  return data;
+}