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Merge pull request #1009 from toyowata/master 

LPC824 - Add UART channel duplication check
pull/1015/merge
Martin Kojtal 2015-04-07 08:18:16 +02:00
parent bcc032ca89 2bc9c4299b
commit 0e6d7ac6fc
1 changed files with 30 additions and 1 deletions
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31
libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC82X/serial_api.c
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@ -90,10 +90,39 @@ static uart_irq_handler irq_handler;
int stdio_uart_inited = 0;
serial_t stdio_uart;
static int check_duplication(serial_t *obj, PinName tx, PinName rx)
{
if (uart_used == 0)
return 0;
const SWM_Map *swm;
uint32_t assigned_tx, assigned_rx;
int ch;
for (ch=0; ch<UART_NUM; ch++) {
// read assigned TX in the UART channel of switch matrix
swm = &SWM_UART_TX[ch];
assigned_tx = LPC_SWM->PINASSIGN[swm->n] & (0xFF << swm->offset);
assigned_tx = assigned_tx >> swm->offset;
// read assigned RX in the UART channel of switch matrix
swm = &SWM_UART_RX[ch];
assigned_rx = LPC_SWM->PINASSIGN[swm->n] & (0xFF << swm->offset);
assigned_rx = assigned_rx >> swm->offset;
if ((assigned_tx == (uint32_t)(tx >> PIN_SHIFT)) && (assigned_rx == (uint32_t)(rx >> PIN_SHIFT))) {
obj->index = ch;
obj->uart = (LPC_USART0_Type *)(LPC_USART0_BASE + (0x4000 * ch));
return 1;
}
}
return 0;
}
void serial_init(serial_t *obj, PinName tx, PinName rx)
{
int is_stdio_uart = 0;
if (check_duplication(obj, tx, rx) == 1)
return;
int uart_n = get_available_uart();
if (uart_n == -1) {
error("No available UART");
@ -192,7 +221,7 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
stop_bits -= 1;
data_bits -= 7;
int paritysel;
int paritysel = 0;
switch (parity) {
case ParityNone: paritysel = 0; break;
case ParityEven: paritysel = 2; break;