Add ps2_interrupt.c
This commit is contained in:
tmk
parent
532e100450
commit
4eb27ee890
4 changed files with 124 additions and 310 deletions
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@ -35,16 +35,16 @@ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* PS/2 protocol busywait version
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*/
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#include <stdbool.h>
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#include <util/delay.h>
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#include "ps2.h"
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#include "debug.h"
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/*
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* PS/2 protocol busywait version
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*/
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#define WAIT(stat, us, err) do { \
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if (!wait_##stat(us)) { \
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ps2_error = err; \
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@ -52,6 +52,7 @@ POSSIBILITY OF SUCH DAMAGE.
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} \
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} while (0)
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uint8_t ps2_error = PS2_ERR_NONE;
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@ -65,18 +66,19 @@ void ps2_host_init(void)
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uint8_t ps2_host_send(uint8_t data)
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{
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uint8_t res = 0;
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bool parity = true;
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ps2_error = PS2_ERR_NONE;
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/* terminate a transmission if we have */
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inhibit();
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_delay_us(200); // at least 100us
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_delay_us(100); // 100us [4]p.13, [5]p.50
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/* start bit [1] */
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/* 'Request to Send' and Start bit */
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data_lo();
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clock_hi();
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WAIT(clock_lo, 20000, 10); // may take 15ms at most until device starts clocking
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/* data [2-9] */
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WAIT(clock_lo, 10000, 10); // 10ms [5]p.50
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/* Data bit */
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for (uint8_t i = 0; i < 8; i++) {
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_delay_us(15);
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if (data&(1<<i)) {
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@ -88,15 +90,18 @@ uint8_t ps2_host_send(uint8_t data)
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WAIT(clock_hi, 50, 2);
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WAIT(clock_lo, 50, 3);
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}
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/* parity [10] */
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/* Parity bit */
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_delay_us(15);
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if (parity) { data_hi(); } else { data_lo(); }
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WAIT(clock_hi, 50, 4);
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WAIT(clock_lo, 50, 5);
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/* stop bit [11] */
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/* Stop bit */
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_delay_us(15);
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data_hi();
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/* ack [12] */
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/* Ack */
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WAIT(data_lo, 50, 6);
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WAIT(clock_lo, 50, 7);
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@ -105,17 +110,16 @@ uint8_t ps2_host_send(uint8_t data)
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WAIT(data_hi, 50, 9);
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inhibit();
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res = ps2_host_recv_response();
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return ps2_host_recv_response();
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ERROR:
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inhibit();
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return res;
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return 0;
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}
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/* receive data when host want else inhibit communication */
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uint8_t ps2_host_recv_response(void)
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{
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// Command might take 20ms to response([3]p.21)
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// TrackPoint might take 25ms ([5]2.7)
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// Command may take 25ms/20ms at most([5]p.46, [3]p.21)
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// 250 * 100us(wait for start bit in ps2_host_recv)
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uint8_t data = 0;
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uint8_t try = 250;
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@ -125,14 +129,6 @@ uint8_t ps2_host_recv_response(void)
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return data;
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}
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/* send LED state to keyboard */
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void ps2_host_set_led(uint8_t led)
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{
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ps2_host_send(0xED);
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ps2_host_send(led);
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}
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/* called after start bit comes */
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uint8_t ps2_host_recv(void)
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{
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@ -180,3 +176,10 @@ ERROR:
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inhibit();
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return 0;
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}
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/* send LED state to keyboard */
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void ps2_host_set_led(uint8_t led)
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{
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ps2_host_send(0xED);
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ps2_host_send(led);
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}
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@ -35,49 +35,16 @@ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* PS/2 protocol Pin interrupt version
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*/
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#include <stdbool.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include "ps2.h"
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#include "debug.h"
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#ifndef PS2_USE_INT
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static uint8_t recv_data(void);
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#endif
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static inline void clock_lo(void);
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static inline void clock_hi(void);
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static inline bool clock_in(void);
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static inline void data_lo(void);
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static inline void data_hi(void);
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static inline bool data_in(void);
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static inline uint16_t wait_clock_lo(uint16_t us);
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static inline uint16_t wait_clock_hi(uint16_t us);
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static inline uint16_t wait_data_lo(uint16_t us);
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static inline uint16_t wait_data_hi(uint16_t us);
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static inline void idle(void);
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static inline void inhibit(void);
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/*
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Primitive PS/2 Library for AVR
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==============================
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Host side is only supported now.
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I/O control
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-----------
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High state is asserted by input with pull up.
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PS/2 References
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---------------
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http://www.computer-engineering.org/ps2protocol/
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http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
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*/
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#define WAIT(stat, us, err) do { \
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if (!wait_##stat(us)) { \
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ps2_error = err; \
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@ -89,38 +56,38 @@ http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
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uint8_t ps2_error = PS2_ERR_NONE;
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static inline uint8_t pbuf_dequeue(void);
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static inline void pbuf_enqueue(uint8_t data);
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static inline bool pbuf_has_data(void);
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static inline void pbuf_clear(void);
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void ps2_host_init(void)
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{
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// POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20)
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_delay_ms(2500);
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#ifdef PS2_USE_INT
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idle();
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PS2_INT_INIT();
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PS2_INT_ON();
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idle();
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#else
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inhibit();
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#endif
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// POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20)
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//_delay_ms(2500);
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}
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// TODO: send using interrupt if available
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uint8_t ps2_host_send(uint8_t data)
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{
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uint8_t res = 0;
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bool parity = true;
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ps2_error = PS2_ERR_NONE;
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#ifdef PS2_USE_INT
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PS2_INT_OFF();
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#endif
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/* terminate a transmission if we have */
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inhibit();
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_delay_us(200); // at least 100us
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_delay_us(100); // 100us [4]p.13, [5]p.50
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/* start bit [1] */
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/* 'Request to Send' and Start bit */
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data_lo();
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clock_hi();
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WAIT(clock_lo, 20000, 10); // may take 15ms at most until device starts clocking
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/* data [2-9] */
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WAIT(clock_lo, 10000, 10); // 10ms [5]p.50
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/* Data bit[2-9] */
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for (uint8_t i = 0; i < 8; i++) {
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_delay_us(15);
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if (data&(1<<i)) {
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@ -132,15 +99,18 @@ uint8_t ps2_host_send(uint8_t data)
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WAIT(clock_hi, 50, 2);
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WAIT(clock_lo, 50, 3);
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}
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/* parity [10] */
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/* Parity bit */
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_delay_us(15);
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if (parity) { data_hi(); } else { data_lo(); }
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WAIT(clock_hi, 50, 4);
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WAIT(clock_lo, 50, 5);
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/* stop bit [11] */
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/* Stop bit */
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_delay_us(15);
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data_hi();
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/* ack [12] */
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/* Ack */
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WAIT(data_lo, 50, 6);
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WAIT(clock_lo, 50, 7);
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@ -148,107 +118,35 @@ uint8_t ps2_host_send(uint8_t data)
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WAIT(clock_hi, 50, 8);
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WAIT(data_hi, 50, 9);
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#ifdef PS2_USE_INT
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PS2_INT_ON();
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#endif
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res = ps2_host_recv_response();
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ERROR:
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#ifdef PS2_USE_INT
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PS2_INT_ON();
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idle();
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#else
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inhibit();
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#endif
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return res;
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PS2_INT_ON();
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return ps2_host_recv_response();
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ERROR:
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idle();
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PS2_INT_ON();
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return 0;
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}
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#ifndef PS2_USE_INT
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/* receive data when host want else inhibit communication */
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uint8_t ps2_host_recv_response(void)
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{
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// Command might take 20ms to response([3]p.21)
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// TrackPoint might take 25ms ([5]2.7)
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uint8_t data = 0;
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uint8_t try = 200;
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while (try-- && (data = ps2_host_recv())) ;
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return data;
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}
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#endif
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#ifndef PS2_USE_INT
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uint8_t ps2_host_recv(void)
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{
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uint8_t data = 0;
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/* release lines(idle state) */
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idle();
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/* wait start bit */
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wait_clock_lo(100); // TODO: this is enough?
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data = recv_data();
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inhibit();
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return data;
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}
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#else
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/* ring buffer to store ps/2 key data */
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#define PBUF_SIZE 32
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static uint8_t pbuf[PBUF_SIZE];
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static uint8_t pbuf_head = 0;
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static uint8_t pbuf_tail = 0;
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static inline void pbuf_enqueue(uint8_t data)
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{
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uint8_t sreg = SREG;
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cli();
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uint8_t next = (pbuf_head + 1) % PBUF_SIZE;
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if (next != pbuf_tail) {
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pbuf[pbuf_head] = data;
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pbuf_head = next;
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} else {
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debug("pbuf: full\n");
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// Command may take 25ms/20ms at most([5]p.46, [3]p.21)
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uint8_t retry = 25;
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while (retry-- && !pbuf_has_data()) {
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_delay_ms(1);
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}
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SREG = sreg;
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}
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static inline uint8_t pbuf_dequeue(void)
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{
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uint8_t val = 0;
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uint8_t sreg = SREG;
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cli();
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if (pbuf_head != pbuf_tail) {
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val = pbuf[pbuf_tail];
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pbuf_tail = (pbuf_tail + 1) % PBUF_SIZE;
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}
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SREG = sreg;
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return val;
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}
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static inline bool pbuf_has_data(void)
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{
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uint8_t sreg = SREG;
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cli();
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bool has_data = (pbuf_head != pbuf_tail);
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SREG = sreg;
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return has_data;
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}
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static inline void pbuf_clear(void)
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{
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uint8_t sreg = SREG;
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cli();
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pbuf_head = pbuf_tail = 0;
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SREG = sreg;
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return pbuf_dequeue();
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}
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/* get data received by interrupt */
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uint8_t ps2_host_recv(void)
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{
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return pbuf_dequeue();
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}
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uint8_t ps2_host_recv_response(void)
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{
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while (!pbuf_has_data()) ;
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return pbuf_dequeue();
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if (pbuf_has_data()) {
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ps2_error = PS2_ERR_NONE;
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return pbuf_dequeue();
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} else {
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ps2_error = PS2_ERR_NODATA;
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return 0;
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}
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}
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ISR(PS2_INT_VECT)
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@ -303,7 +201,6 @@ ISR(PS2_INT_VECT)
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if (!data_in())
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goto ERROR;
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pbuf_enqueue(data);
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//phex(data);
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goto DONE;
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break;
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default:
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@ -311,7 +208,6 @@ ISR(PS2_INT_VECT)
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}
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goto RETURN;
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ERROR:
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inhibit();
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ps2_error = state;
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DONE:
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state = INIT;
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@ -320,8 +216,6 @@ DONE:
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RETURN:
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return;
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}
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#endif
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/* send LED state to keyboard */
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void ps2_host_set_led(uint8_t led)
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@ -331,139 +225,53 @@ void ps2_host_set_led(uint8_t led)
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}
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#ifndef PS2_USE_INT
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/* called after start bit comes */
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static uint8_t recv_data(void)
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/*--------------------------------------------------------------------
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* Ring buffer to store scan codes from keyboard
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*------------------------------------------------------------------*/
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#define PBUF_SIZE 32
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static uint8_t pbuf[PBUF_SIZE];
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static uint8_t pbuf_head = 0;
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static uint8_t pbuf_tail = 0;
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static inline void pbuf_enqueue(uint8_t data)
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{
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uint8_t data = 0;
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bool parity = true;
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ps2_error = PS2_ERR_NONE;
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/* start bit [1] */
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WAIT(clock_lo, 1, 1);
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WAIT(data_lo, 1, 2);
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WAIT(clock_hi, 50, 3);
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/* data [2-9] */
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for (uint8_t i = 0; i < 8; i++) {
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WAIT(clock_lo, 50, 4);
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if (data_in()) {
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parity = !parity;
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data |= (1<<i);
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}
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WAIT(clock_hi, 50, 5);
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uint8_t sreg = SREG;
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cli();
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uint8_t next = (pbuf_head + 1) % PBUF_SIZE;
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if (next != pbuf_tail) {
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pbuf[pbuf_head] = data;
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pbuf_head = next;
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} else {
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debug("pbuf: full\n");
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}
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SREG = sreg;
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}
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static inline uint8_t pbuf_dequeue(void)
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{
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uint8_t val = 0;
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/* parity [10] */
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WAIT(clock_lo, 50, 6);
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if (data_in() != parity) {
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ps2_error = PS2_ERR_PARITY;
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goto ERROR;
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uint8_t sreg = SREG;
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cli();
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if (pbuf_head != pbuf_tail) {
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val = pbuf[pbuf_tail];
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pbuf_tail = (pbuf_tail + 1) % PBUF_SIZE;
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}
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WAIT(clock_hi, 50, 7);
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SREG = sreg;
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/* stop bit [11] */
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WAIT(clock_lo, 50, 8);
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WAIT(data_hi, 1, 9);
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WAIT(clock_hi, 50, 10);
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return data;
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ERROR:
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return 0;
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return val;
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}
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#endif
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static inline void clock_lo()
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static inline bool pbuf_has_data(void)
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{
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PS2_CLOCK_PORT &= ~(1<<PS2_CLOCK_BIT);
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PS2_CLOCK_DDR |= (1<<PS2_CLOCK_BIT);
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uint8_t sreg = SREG;
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cli();
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bool has_data = (pbuf_head != pbuf_tail);
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SREG = sreg;
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return has_data;
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}
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static inline void clock_hi()
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static inline void pbuf_clear(void)
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{
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/* input with pull up */
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PS2_CLOCK_DDR &= ~(1<<PS2_CLOCK_BIT);
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PS2_CLOCK_PORT |= (1<<PS2_CLOCK_BIT);
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}
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static inline bool clock_in()
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{
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PS2_CLOCK_DDR &= ~(1<<PS2_CLOCK_BIT);
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PS2_CLOCK_PORT |= (1<<PS2_CLOCK_BIT);
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_delay_us(1);
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return PS2_CLOCK_PIN&(1<<PS2_CLOCK_BIT);
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}
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static inline void data_lo()
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{
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||||
PS2_DATA_PORT &= ~(1<<PS2_DATA_BIT);
|
||||
PS2_DATA_DDR |= (1<<PS2_DATA_BIT);
|
||||
}
|
||||
static inline void data_hi()
|
||||
{
|
||||
/* input with pull up */
|
||||
PS2_DATA_DDR &= ~(1<<PS2_DATA_BIT);
|
||||
PS2_DATA_PORT |= (1<<PS2_DATA_BIT);
|
||||
}
|
||||
static inline bool data_in()
|
||||
{
|
||||
PS2_DATA_DDR &= ~(1<<PS2_DATA_BIT);
|
||||
PS2_DATA_PORT |= (1<<PS2_DATA_BIT);
|
||||
_delay_us(1);
|
||||
return PS2_DATA_PIN&(1<<PS2_DATA_BIT);
|
||||
uint8_t sreg = SREG;
|
||||
cli();
|
||||
pbuf_head = pbuf_tail = 0;
|
||||
SREG = sreg;
|
||||
}
|
||||
|
||||
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 */
|
||||
static inline void inhibit(void)
|
||||
{
|
||||
clock_lo();
|
||||
data_hi();
|
||||
}
|
||||
|
||||
|
||||
/* PS/2 Resources
|
||||
*
|
||||
* [1] The PS/2 Mouse/Keyboard Protocol
|
||||
* http://www.computer-engineering.org/ps2protocol/
|
||||
* Concise and thorough primer of PS/2 protocol.
|
||||
*
|
||||
* [2] Keyboard and Auxiliary Device Controller
|
||||
* http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
|
||||
* Signal Timing and Format
|
||||
*
|
||||
* [3] Keyboards(101- and 102-key)
|
||||
* http://www.mcamafia.de/pdf/ibm_hitrc11.pdf
|
||||
* Keyboard Layout, Scan Code Set, POR, and Commands.
|
||||
*
|
||||
* [4] PS/2 Reference Manuals
|
||||
* http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
|
||||
* Collection of IBM Personal System/2 documents.
|
||||
*
|
||||
* [5] TrackPoint Engineering Specifications for version 3E
|
||||
* https://web.archive.org/web/20100526161812/http://wwwcssrv.almaden.ibm.com/trackpoint/download.html
|
||||
*/
|
||||
|
|
@ -82,13 +82,14 @@ uint8_t ps2_host_send(uint8_t data)
|
|||
|
||||
/* terminate a transmission if we have */
|
||||
inhibit();
|
||||
_delay_us(100);
|
||||
_delay_us(100); // [4]p.13
|
||||
|
||||
/* start bit [1] */
|
||||
/* 'Request to Send' and Start bit */
|
||||
data_lo();
|
||||
clock_hi();
|
||||
WAIT(clock_lo, 15000, 1);
|
||||
/* data [2-9] */
|
||||
WAIT(clock_lo, 10000, 10); // 10ms [5]p.50
|
||||
|
||||
/* Data bit[2-9] */
|
||||
for (uint8_t i = 0; i < 8; i++) {
|
||||
_delay_us(15);
|
||||
if (data&(1<<i)) {
|
||||
|
|
@ -100,15 +101,18 @@ uint8_t ps2_host_send(uint8_t data)
|
|||
WAIT(clock_hi, 50, 2);
|
||||
WAIT(clock_lo, 50, 3);
|
||||
}
|
||||
/* parity [10] */
|
||||
|
||||
/* Parity bit */
|
||||
_delay_us(15);
|
||||
if (parity) { data_hi(); } else { data_lo(); }
|
||||
WAIT(clock_hi, 50, 4);
|
||||
WAIT(clock_lo, 50, 5);
|
||||
/* stop bit [11] */
|
||||
|
||||
/* Stop bit */
|
||||
_delay_us(15);
|
||||
data_hi();
|
||||
/* ack [12] */
|
||||
|
||||
/* Ack */
|
||||
WAIT(data_lo, 50, 6);
|
||||
WAIT(clock_lo, 50, 7);
|
||||
|
||||
|
|
@ -127,12 +131,12 @@ ERROR:
|
|||
return 0;
|
||||
}
|
||||
|
||||
// Do polling data from keyboard to get response to last command.
|
||||
uint8_t ps2_host_recv_response(void)
|
||||
{
|
||||
// Command may take 25ms/20ms at most([5]p.46, [3]p.21)
|
||||
uint8_t retry = 25;
|
||||
while (retry-- && !pbuf_has_data()) {
|
||||
_delay_ms(1); // without this delay it seems to fall into deadlock
|
||||
_delay_ms(1);
|
||||
}
|
||||
return pbuf_dequeue();
|
||||
}
|
||||
|
|
@ -188,7 +192,6 @@ static inline void pbuf_enqueue(uint8_t data)
|
|||
}
|
||||
SREG = sreg;
|
||||
}
|
||||
|
||||
static inline uint8_t pbuf_dequeue(void)
|
||||
{
|
||||
uint8_t val = 0;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue