/* exchanges a byte (full duplex) with the controller */
static byte send_and_receive_byte(byte send_data) {
byte received_data = 0x00;
unsigned char i;
/* send bit by bit */
for(i = 0; i < 8; i++) {
/* send our bit by setting the command pin with our send_data "i" bit */
if(CHECK_BIT(send_data, i) == 0) {
DS2MSP_PORTOUT &= ~DS2MSP_COMMAND_PIN;
} else {
DS2MSP_PORTOUT |= DS2MSP_COMMAND_PIN;
}
/* sinalize that our data is there and ask for the controller data by
setting the clock pin to low */
DS2MSP_PORTOUT &= ~DS2MSP_CLOCK_PIN;
bit_delay();
/* receive the data sent by the controller */
if((DS2MSP_PORTIN & DS2MSP_DATA_PIN) != 0) {
received_data |= (1 << i);
}
/* set the clock to high */
DS2MSP_PORTOUT |= DS2MSP_CLOCK_PIN;
bit_delay();
}
return received_data;
}
static void l3_write_byte (unsigned char data, bool address_mode)
{
int bit;
L3PORT |= L3CLOCK;
if (address_mode)
L3PORT &= ~L3MODE;
else
L3PORT |= L3MODE;
bit_delay();
for (bit=0; bit < 8; bit++)
{
if (data & 1)
{
L3PORT |= L3DATA;
}
else
{
L3PORT &= ~L3DATA;
}
L3PORT &= ~L3CLOCK;
bit_delay();
L3PORT |= L3CLOCK;
bit_delay();
data >>= 1;
}
if (address_mode)
L3PORT |= L3MODE;
else
L3PORT &= ~L3MODE;
bit_delay();
}
static void
tm1640_start(void)
{
TM1640_PORT &= ~TM1640_DIN;
bit_delay();
TM1640_PORT &= ~TM1640_SCLK;
bit_delay();
}
void
tm1640_end(void)
{
TM1640_PORT &= ~TM1640_DIN;
bit_delay();
TM1640_PORT |= TM1640_SCLK;
bit_delay();
TM1640_PORT |= TM1640_DIN;
bit_delay();
}
/* uart_putc() -- blocking 8N1 transmit */
void uart_putc(uint8_t ch)
{
uint8_t bit;
tx_pin(STARTBIT);
bit_delay();
for (bit = 0; bit < 8; bit++) {
tx_pin(ch & 0x1);
ch = ch >> 1;
bit_delay();
}
tx_pin(STOPBIT);
bit_delay();
}
void
tm1640_send_byte(uint8_t v)
{
uint8_t b=0x01; /* start at LSB */
while(b) {
if(v & b)
TM1640_PORT |= TM1640_DIN;
else
TM1640_PORT &= ~TM1640_DIN;
bit_delay();
TM1640_PORT |= TM1640_SCLK;
bit_delay();
TM1640_PORT &= ~ TM1640_SCLK;
b <<= 1; /* move from LSB to MSB */
}
}
static int __getc(void)
{
uint8_t bit;
uint8_t ch;
half_bit_delay();
if (rx_pin() != STARTBIT)
return -1; /* Glitch */
bit_delay();
for (bit = 0; bit < 8; bit++) {
ch = ch >> 1;
if (rx_pin())
ch |= 1 << 7;
bit_delay();
}
if (rx_pin() != STOPBIT)
return -2; /* Frame error */
return (int) ch;
}
void put_char(volatile unsigned char *port, unsigned char pin, char txchar) {
//
// send character in txchar on port pin
// assumes line driver (inverts bits)
//
// start bit
//
clear(*port,pin);
bit_delay();
//
// unrolled loop to write data bits
//
if bit_test(txchar,0)
set(*port,pin);
else
void get_char(volatile unsigned char *pins, unsigned char pin, char *rxbyte) {
//
// read character into rxbyte on pins pin
// assumes line driver (inverts bits)
//
*rxbyte = 0;
while (pin_test(*pins,pin))
//
// wait for start bit
//
;
//
// delay to middle of first data bit
//
half_bit_delay();
bit_delay();
//
// unrolled loop to read data bits
//
if pin_test(*pins,pin)
*rxbyte |= (1 << 0);
else
