Tweak time values of busywait PS/2

[max/tmk_keyboard.git] / protocol / ps2.c

diff --git a/protocol/ps2.c b/protocol/ps2.c
index cf7b1f43ce42076e9b6eb876b844180afb427cc3..4c6c2fcb27b379b3e37b0f8e8adc5e66e237c5af 100644 (file)
--- a/protocol/ps2.c
+++ b/protocol/ps2.c
@@ -109,12 +109,12 @@ uint8_t ps2_host_send(uint8_t data)
 #endif
     /* terminate a transmission if we have */
     inhibit();
-    _delay_us(100);
+    _delay_us(200); // at least 100us
 
     /* start bit [1] */
     data_lo();
     clock_hi();
-    WAIT(clock_lo, 15000, 1);
+    WAIT(clock_lo, 20000, 10);   // may take 15ms at most until device starts clocking
     /* data [2-9] */
     for (uint8_t i = 0; i < 8; i++) {
         _delay_us(15);
@@ -167,7 +167,7 @@ uint8_t ps2_host_recv_response(void)
     idle();
 
     /* wait start bit */
-    wait_clock_lo(2000);
+    wait_clock_lo(25000);    // command response may take 20 ms at most
     data = recv_data();
 
     inhibit();
@@ -181,7 +181,7 @@ uint8_t ps2_host_recv(void)
 }
 #else
 /* ring buffer to store ps/2 key data */
-#define PBUF_SIZE 8
+#define PBUF_SIZE 32
 static uint8_t pbuf[PBUF_SIZE];
 static uint8_t pbuf_head = 0;
 static uint8_t pbuf_tail = 0;