ssize_t uart_read_r(struct _reent *r, int fd, void *ptr, size_t len)
{
while (!rx_buf.len);
if (len > rx_buf.len)
len = rx_buf.len;
char *c = (char*)ptr;
for (int i = 0; i < len; i++)
rb_getc(&rx_buf, c++);
return len;
}
ssize_t apc220_read_str(char *ptr) {
int len = -1;
int result = 0;
char c;
if ( xSemaphoreRx != NULL ) {
if( xSemaphoreTake( xSemaphoreRx, 0 ) == pdTRUE ) {
result = rb_getc(&rx_buf1, &c);
if (result != 0) {
buffer_rx[buffer_rx_index++] = c;
}
xSemaphoreGive( xSemaphoreRx );
// We don't need to protect rx_buf2 because at this point rx_buf1 is available so
// the ISR will attempt to write into rx_buf1 instead of rx_buf2
result = rb_getc(&rx_buf2, &c);
if (result != 0) {
buffer_rx[buffer_rx_index++] = c;
}
}
}
if ((buffer_rx_index > 0) && (buffer_rx[buffer_rx_index-1] == '\0')) {
len = buffer_rx_index-1;
for (int i=0 ;i < len ; i++) {
ptr[i] = buffer_rx[i];
}
buffer_rx_index = 0;
}
return len;
}
void apc220_send_task() {
char c;
int result = 0;
if( xSemaphoreTake( xSemaphoreTx, ( portTickType ) 10 ) == pdTRUE ) {
result = rb_getc(&tx_buf, &c);
xSemaphoreGive( xSemaphoreTx );
}
if (result) {
while ( !(USART1->SR & 0x00000040) );
USART_SendData(USART1, c);
uart_stats.tx_bytes++;
}
}
void USART1_IRQHandler(void)
{
if (USART1->SR & USART_SR_RXNE) {
if (!rb_putc(&rx_buf, USART1->DR))
uart_stats.rx_overrun++;
else
uart_stats.rx_bytes++;
}
if (USART1->SR & USART_SR_TXE) {
char c;
if (rb_getc(&tx_buf, &c)) {
// send a queued byte
//
USART1->DR = c;
}
else {
// nothing to send, disable interrupt
//
USART1->CR1 &= ~USART_CR1_TXEIE;
}
uart_stats.tx_bytes++;
}
}
