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Minor usart code readability improvement.

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This commit is contained in:
Dominic Clifton 2014-12-13 18:05:22 +00:00
parent 119542a218
commit ea9633f2b1
1 changed files with 2 additions and 2 deletions
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4
src/main/drivers/serial_uart.c
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@ -207,14 +207,14 @@ uint8_t uartTotalBytesWaiting(serialPort_t *instance)
uartPort_t *s = (uartPort_t*)instance;
if (s->rxDMAChannel) {
uint32_t rxDMAHead = s->rxDMAChannel->CNDTR;
if (s->port.rxBufferSize + rxDMAHead - s->rxDMAPos >= s->port.rxBufferSize) {
if (rxDMAHead >= s->rxDMAPos) {
return rxDMAHead - s->rxDMAPos;
} else {
return s->port.rxBufferSize + rxDMAHead - s->rxDMAPos;
}
}
if (s->port.rxBufferSize + s->port.rxBufferHead - s->port.rxBufferTail >= s->port.rxBufferSize) {
if (s->port.rxBufferHead >= s->port.rxBufferTail) {
return s->port.rxBufferHead - s->port.rxBufferTail;
} else {
return s->port.rxBufferSize + s->port.rxBufferHead - s->port.rxBufferTail;