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Update serial port irq handlers so they avoid the % operator.

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This commit is contained in:
Dominic Clifton 2014-12-12 16:23:44 +00:00
parent d8127f65ad
commit ad9a2d2833
2 changed files with 16 additions and 4 deletions
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10
src/main/drivers/serial_uart_stm32f10x.c
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@ -59,13 +59,19 @@ void usartIrqCallback(uartPort_t *s)
s->port.callback(s->USARTx->DR);
} else {
s->port.rxBuffer[s->port.rxBufferHead] = s->USARTx->DR;
s->port.rxBufferHead = (s->port.rxBufferHead + 1) % s->port.rxBufferSize;
s->port.rxBufferHead++;
if (s->port.rxBufferHead >= s->port.rxBufferSize) {
s->port.rxBufferHead = 0;
}
}
}
if (SR & USART_FLAG_TXE) {
if (s->port.txBufferTail != s->port.txBufferHead) {
s->USARTx->DR = s->port.txBuffer[s->port.txBufferTail];
s->port.txBufferTail = (s->port.txBufferTail + 1) % s->port.txBufferSize;
s->port.txBufferTail++;
if (s->port.txBufferTail >= s->port.txBufferSize) {
s->port.txBufferTail = 0;
}
} else {
USART_ITConfig(s->USARTx, USART_IT_TXE, DISABLE);
}