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Hardware flow control implementation for LPC81X

pull/135/head
Bogdan Marinescu 2013-12-05 16:12:47 +02:00
parent d0b2fb6c66
commit 53cd64775d
1 changed files with 44 additions and 0 deletions
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44
libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC81X/serial_api.c
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@ -39,6 +39,18 @@ static const SWM_Map SWM_UART_RX[] = {
{2, 24}, {2, 24},
}; };
static const SWM_Map SWM_UART_RTS[] = {
{0, 16},
{1, 24},
{3, 0},
};
static const SWM_Map SWM_UART_CTS[] = {
{0, 24},
{2, 0},
{3, 8}
};
// bit flags for used UARTs // bit flags for used UARTs
static unsigned char uart_used = 0; static unsigned char uart_used = 0;
static int get_available_uart(void) { static int get_available_uart(void) {
@ -60,6 +72,7 @@ static int get_available_uart(void) {
#define TXRDY (0x01<<2) #define TXRDY (0x01<<2)
#define TXBRKEN (0x01<<1) #define TXBRKEN (0x01<<1)
#define CTSEN (0x01<<9)
static uint32_t UARTSysClk; static uint32_t UARTSysClk;
@ -278,3 +291,34 @@ void serial_break_clear(serial_t *obj) {
obj->uart->CTRL &= ~TXBRKEN; obj->uart->CTRL &= ~TXBRKEN;
} }
void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow) {
const SWM_Map *swm_rts, *swm_cts;
uint32_t regVal_rts, regVal_cts;
swm_rts = &SWM_UART_RTS[obj->index];
swm_cts = &SWM_UART_CTS[obj->index];
regVal_rts = LPC_SWM->PINASSIGN[swm_rts->n] & ~(0xFF << swm_rts->offset);
regVal_cts = LPC_SWM->PINASSIGN[swm_cts->n] & ~(0xFF << swm_cts->offset);
if (FlowControlNone == type) {
LPC_SWM->PINASSIGN[swm_rts->n] = regVal_rts | (0xFF << swm_rts->offset);
LPC_SWM->PINASSIGN[swm_cts->n] = regVal_cts | (0xFF << swm_cts->offset);
obj->uart->CFG &= ~CTSEN;
return;
}
if ((FlowControlRTS == type || FlowControlRTSCTS == type) && (rxflow != NC)) {
LPC_SWM->PINASSIGN[swm_rts->n] = regVal_rts | (rxflow << swm_rts->offset);
if (FlowControlRTS == type) {
LPC_SWM->PINASSIGN[swm_cts->n] = regVal_cts | (0xFF << swm_cts->offset);
obj->uart->CFG &= ~CTSEN;
}
}
if ((FlowControlCTS == type || FlowControlRTSCTS == type) && (txflow != NC)) {
LPC_SWM->PINASSIGN[swm_cts->n] = regVal_cts | (txflow << swm_cts->offset);
obj->uart->CFG |= CTSEN;
if (FlowControlCTS == type) {
LPC_SWM->PINASSIGN[swm_rts->n] = regVal_rts | (0xFF << swm_rts->offset);
}
}
}