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Add ps2_usart.c and fix set_led at USB wake

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b6_b7_audio
tmk 12 years ago
parent 9d26053f1c
commit 532e100450
4 changed files with 29 additions and 126 deletions
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  1. 4
      protocol/lufa/lufa.c
  2. 3
      protocol/pjrc/usb.c
  3. 2
      protocol/ps2.h
  4. 146
      protocol/ps2_usart.c

4
protocol/lufa/lufa.c
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@ -148,7 +148,6 @@ static void Console_Task(void)
*/
void EVENT_USB_Device_Connect(void)
{
led_set(0x1f); // all on
}
void EVENT_USB_Device_Disconnect(void)
@ -172,8 +171,9 @@ void EVENT_USB_Device_WakeUp()
#ifdef SLEEP_LED_ENABLE
sleep_led_disable();
#endif
// NOTE: converters may not accept this
led_set(host_keyboard_leds());
#endif
}
void EVENT_USB_Device_StartOfFrame(void)

3
protocol/pjrc/usb.c
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@ -662,8 +662,9 @@ ISR(USB_GEN_vect)
suspend_wakeup_init();
#ifdef SLEEP_LED_ENABLE
sleep_led_disable();
#endif
// NOTE: converters may not accept this
led_set(host_keyboard_leds());
#endif
UDIEN |= (1<<SUSPE);
UDIEN &= ~(1<<WAKEUPE);

2
protocol/ps2.h
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@ -70,11 +70,13 @@ POSSIBILITY OF SUCH DAMAGE.
#define PS2_RESEND 0xFE
#define PS2_SET_LED 0xED
// TODO: error numbers
#define PS2_ERR_NONE 0
#define PS2_ERR_STARTBIT1 1
#define PS2_ERR_STARTBIT2 2
#define PS2_ERR_STARTBIT3 3
#define PS2_ERR_PARITY 0x10
#define PS2_ERR_NODATA 0x20
#define PS2_LED_SCROLL_LOCK 0
#define PS2_LED_NUM_LOCK 1

146
protocol/ps2_usart.c
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@ -36,26 +36,9 @@ POSSIBILITY OF SUCH DAMAGE.
*/
/*
Primitive PS/2 Library for AVR
==============================
Host side is only supported now.
Synchronous USART is used to receive data by hardware process
rather than interrupt. During V-USB interrupt runs, CLOCK interrupt
cannot interpose. In the result it is prone to lost CLOCK edge.
* PS/2 protocol USART version
*/
I/O control
-----------
High state is asserted by internal pull-up.
If you have a signaling problem, you may need to have
external pull-up resisters on CLOCK and DATA line.
PS/2 References
---------------
http://www.computer-engineering.org/ps2protocol/
http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
*/
#include <stdbool.h>
#include <avr/io.h>
#include <avr/interrupt.h>
@ -75,18 +58,6 @@ http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
uint8_t ps2_error = PS2_ERR_NONE;
static inline void clock_lo(void);
static inline void clock_hi(void);
static inline bool clock_in(void);
static inline void data_lo(void);
static inline void data_hi(void);
static inline bool data_in(void);
static inline uint16_t wait_clock_lo(uint16_t us);
static inline uint16_t wait_clock_hi(uint16_t us);
static inline uint16_t wait_data_lo(uint16_t us);
static inline uint16_t wait_data_hi(uint16_t us);
static inline void idle(void);
static inline void inhibit(void);
static inline uint8_t pbuf_dequeue(void);
static inline void pbuf_enqueue(uint8_t data);
static inline bool pbuf_has_data(void);
@ -95,14 +66,15 @@ static inline void pbuf_clear(void);
void ps2_host_init(void)
{
idle();
idle(); // without this many USART errors occur when cable is disconnected
PS2_USART_INIT();
PS2_USART_RX_INT_ON();
// POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20)
//_delay_ms(2500);
}
uint8_t ps2_host_send(uint8_t data)
{
uint8_t res = 0;
bool parity = true;
ps2_error = PS2_ERR_NONE;
@ -144,20 +116,22 @@ uint8_t ps2_host_send(uint8_t data)
WAIT(clock_hi, 50, 8);
WAIT(data_hi, 50, 9);
idle();
PS2_USART_INIT();
PS2_USART_RX_INT_ON();
res = ps2_host_recv_response();
return ps2_host_recv_response();
ERROR:
idle();
PS2_USART_INIT();
PS2_USART_RX_INT_ON();
return res;
return 0;
}
// Do polling data from keyboard to get response to last command.
uint8_t ps2_host_recv_response(void)
{
while (!pbuf_has_data()) {
uint8_t retry = 25;
while (retry-- && !pbuf_has_data()) {
_delay_ms(1); // without this delay it seems to fall into deadlock
}
return pbuf_dequeue();
@ -165,106 +139,32 @@ uint8_t ps2_host_recv_response(void)
uint8_t ps2_host_recv(void)
{
return pbuf_dequeue();
if (pbuf_has_data()) {
ps2_error = PS2_ERR_NONE;
return pbuf_dequeue();
} else {
ps2_error = PS2_ERR_NODATA;
return 0;
}
}
ISR(PS2_USART_RX_VECT)
{
uint8_t error = PS2_USART_ERROR;
// TODO: request RESEND when error occurs?
uint8_t error = PS2_USART_ERROR; // USART error should be read before data
uint8_t data = PS2_USART_RX_DATA;
if (!error) {
pbuf_enqueue(data);
} else {
xprintf("PS2 USART error: %02X data: %02X\n", error, data);
}
}
/* send LED state to keyboard */
void ps2_host_set_led(uint8_t led)
{
// send 0xED then keyboard keeps waiting for next LED data
// and keyboard does not send any scan codes during waiting.
// If fail to send LED data keyboard looks like being freezed.
uint8_t retry = 3;
while (retry-- && ps2_host_send(PS2_SET_LED) != PS2_ACK)
;
retry = 3;
while (retry-- && ps2_host_send(led) != PS2_ACK)
;
}
/*--------------------------------------------------------------------
* static functions
*------------------------------------------------------------------*/
static inline void clock_lo()
{
PS2_CLOCK_PORT &= ~(1<<PS2_CLOCK_BIT);
PS2_CLOCK_DDR |= (1<<PS2_CLOCK_BIT);
}
static inline void clock_hi()
{
/* input with pull up */
PS2_CLOCK_DDR &= ~(1<<PS2_CLOCK_BIT);
PS2_CLOCK_PORT |= (1<<PS2_CLOCK_BIT);
}
static inline bool clock_in()
{
PS2_CLOCK_DDR &= ~(1<<PS2_CLOCK_BIT);
PS2_CLOCK_PORT |= (1<<PS2_CLOCK_BIT);
_delay_us(1);
return PS2_CLOCK_PIN&(1<<PS2_CLOCK_BIT);
}
static inline void data_lo()
{
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);
}
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();
ps2_host_send(0xED);
ps2_host_send(led);
}

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