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softuart tx complete

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Andrew 2017-01-22 22:38:24 +08:00 • committed by Bernhard Guillon
parent 5192f73183
commit 22987435fa
3 changed files with 50 additions and 6 deletions
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46
extras/softuart/softuart.c
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@ -79,7 +79,43 @@ void handle_rx(uint8_t gpio_num)
// Reenable interrupt
gpio_set_interrupt(rx_pin, GPIO_INTTYPE_EDGE_NEG, handle_rx);
}
static uint8_t inline chbit(uint8_t data, uint8_t bit)
{
if((data & bit) != 0)
{
return 1;
} else
{
return 0;
}
}
uint8_t softuart_putchar( char data)
{
unsigned i;
unsigned start_time = 0x7FFFFFFF & sdk_system_get_time();
gpio_write(tx_pin, 0);
for(i = 0; i <= 8; i++)
{
while((0x7FFFFFFF & sdk_system_get_time()) < (start_time + (s.bit_time*(i+1))))
{
if((0x7FFFFFFF & sdk_system_get_time()) < start_time) { break;}
}
gpio_write(tx_pin, chbit(data, 1<<i));
}
while((0x7FFFFFFF & sdk_system_get_time()) < (start_time + (s.bit_time*9)))
{
if((0x7FFFFFFF & sdk_system_get_time()) < start_time){ break;}
}
gpio_write(tx_pin, 1);
sdk_os_delay_us(s.bit_time*6);
return 0;
}
void softuart_puts(const char *c)
{
while( *c ) {
softuart_putchar((uint8_t)*c++);
}
}
bool softuart_init(uint32_t baudrate)
{
if (baudrate == 0)
@ -89,12 +125,16 @@ bool softuart_init(uint32_t baudrate)
s.bit_time = (1000000 / baudrate);
if ( ((100000000 / baudrate) - (100*s.bit_time)) > 50 )
s.bit_time++;
//Set Rx
gpio_enable(rx_pin, GPIO_INPUT);
gpio_set_pullup(rx_pin, true, false);
// Set up the interrupt handler to get the startbit
gpio_set_interrupt(rx_pin, GPIO_INTTYPE_EDGE_NEG, handle_rx);
//Set Tx
gpio_enable(tx_pin, GPIO_OUTPUT);
gpio_set_pullup(tx_pin, true, false);
gpio_write(tx_pin, 1);
sdk_os_delay_us(100000);
return true;
}