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authortmk <hasu@tmk-kbd.com>2015-04-09 18:32:04 +0200
committertmk <hasu@tmk-kbd.com>2015-04-09 18:32:04 +0200
commit1a02ebcc612e9a9c0d87e02295c7258de3a70ccc (patch)
treee517f3c70bb2d542797e57d13e9023c84af230fb /tmk_core/protocol/ibm4704.h
parent6746e37088ce8ba03529c1226bd216705edb2b1f (diff)
parenta074364c3731d66b56d988c8a6c960a83ea0e0a1 (diff)
downloadqmk_firmware-1a02ebcc612e9a9c0d87e02295c7258de3a70ccc.tar.gz
qmk_firmware-1a02ebcc612e9a9c0d87e02295c7258de3a70ccc.tar.xz
Merge commit 'a074364c3731d66b56d988c8a6c960a83ea0e0a1' as 'tmk_core'
Diffstat (limited to 'tmk_core/protocol/ibm4704.h')
-rw-r--r--tmk_core/protocol/ibm4704.h110
1 files changed, 110 insertions, 0 deletions
diff --git a/tmk_core/protocol/ibm4704.h b/tmk_core/protocol/ibm4704.h
new file mode 100644
index 000000000..618cce6be
--- /dev/null
+++ b/tmk_core/protocol/ibm4704.h
@@ -0,0 +1,110 @@
+/*
+Copyright 2014 Jun WAKO <wakojun@gmail.com>
+*/
+#ifndef IBM4704_H
+#define IBM4704_H
+
+#define IBM4704_ERR_NONE 0
+#define IBM4704_ERR_PARITY 0x70
+
+
+void ibm4704_init(void);
+uint8_t ibm4704_send(uint8_t data);
+uint8_t ibm4704_recv_response(void);
+uint8_t ibm4704_recv(void);
+
+
+/* Check pin configuration */
+#if !(defined(IBM4704_CLOCK_PORT) && \
+ defined(IBM4704_CLOCK_PIN) && \
+ defined(IBM4704_CLOCK_DDR) && \
+ defined(IBM4704_CLOCK_BIT))
+# error "ibm4704 clock pin configuration is required in config.h"
+#endif
+
+#if !(defined(IBM4704_DATA_PORT) && \
+ defined(IBM4704_DATA_PIN) && \
+ defined(IBM4704_DATA_DDR) && \
+ defined(IBM4704_DATA_BIT))
+# error "ibm4704 data pin configuration is required in config.h"
+#endif
+
+
+/*--------------------------------------------------------------------
+ * static functions
+ *------------------------------------------------------------------*/
+static inline void clock_lo(void)
+{
+ IBM4704_CLOCK_PORT &= ~(1<<IBM4704_CLOCK_BIT);
+ IBM4704_CLOCK_DDR |= (1<<IBM4704_CLOCK_BIT);
+}
+static inline void clock_hi(void)
+{
+ /* input with pull up */
+ IBM4704_CLOCK_DDR &= ~(1<<IBM4704_CLOCK_BIT);
+ IBM4704_CLOCK_PORT |= (1<<IBM4704_CLOCK_BIT);
+}
+static inline bool clock_in(void)
+{
+ IBM4704_CLOCK_DDR &= ~(1<<IBM4704_CLOCK_BIT);
+ IBM4704_CLOCK_PORT |= (1<<IBM4704_CLOCK_BIT);
+ _delay_us(1);
+ return IBM4704_CLOCK_PIN&(1<<IBM4704_CLOCK_BIT);
+}
+static inline void data_lo(void)
+{
+ IBM4704_DATA_PORT &= ~(1<<IBM4704_DATA_BIT);
+ IBM4704_DATA_DDR |= (1<<IBM4704_DATA_BIT);
+}
+static inline void data_hi(void)
+{
+ /* input with pull up */
+ IBM4704_DATA_DDR &= ~(1<<IBM4704_DATA_BIT);
+ IBM4704_DATA_PORT |= (1<<IBM4704_DATA_BIT);
+}
+static inline bool data_in(void)
+{
+ IBM4704_DATA_DDR &= ~(1<<IBM4704_DATA_BIT);
+ IBM4704_DATA_PORT |= (1<<IBM4704_DATA_BIT);
+ _delay_us(1);
+ return IBM4704_DATA_PIN&(1<<IBM4704_DATA_BIT);
+}
+
+static inline uint16_t wait_clock_lo(uint16_t us)
+{
+ while (clock_in() && us) { asm(""); _delay_us(1); us--; }
+ return us;
+}
+static inline uint16_t wait_clock_hi(uint16_t us)
+{
+ while (!clock_in() && us) { asm(""); _delay_us(1); us--; }
+ return us;
+}
+static inline uint16_t wait_data_lo(uint16_t us)
+{
+ while (data_in() && us) { asm(""); _delay_us(1); us--; }
+ return us;
+}
+static inline uint16_t wait_data_hi(uint16_t us)
+{
+ while (!data_in() && us) { asm(""); _delay_us(1); us--; }
+ return us;
+}
+
+/* idle state that device can send */
+static inline void idle(void)
+{
+ clock_hi();
+ data_hi();
+}
+
+/* inhibit device to send
+ * keyboard checks Data line on start bit(Data:hi) and it stops sending if Data line is low.
+ */
+static inline void inhibit(void)
+{
+ clock_hi();
+ data_lo();
+}
+
+#endif