Bernhard Filzmaier
mbed library sources
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mbed official
Diff: targets/hal/TARGET_NXP/TARGET_LPC11U6X/serial_api.c
- Revision:
- 220:aa774fb95d17
- Parent:
- 186:2e805bf06ee4
- Child:
- 227:7bd0639b8911
--- a/targets/hal/TARGET_NXP/TARGET_LPC11U6X/serial_api.c Mon Jun 02 09:45:07 2014 +0100
+++ b/targets/hal/TARGET_NXP/TARGET_LPC11U6X/serial_api.c Tue Jun 03 10:30:56 2014 +0100
@@ -13,6 +13,7 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
+
// math.h required for floating point operations for baud rate calculation
#include <math.h>
#include <string.h>
@@ -24,22 +25,35 @@
#include "error.h"
#if DEVICE_SERIAL
-#warning "[TODO] support from UART_1 to UART_4"
+
/******************************************************************************
* INITIALIZATION
******************************************************************************/
-#define UART_NUM 1
+#define UART_NUM 5
+
+// CFG
+#define UART_EN (0x01<<0)
+
+// CTL
+#define TXBRKEN (0x01<<1)
+
+// STAT
+#define RXRDY (0x01<<0)
+#define TXRDY (0x01<<2)
+#define DELTACTS (0x01<<5)
+#define RXBRK (0x01<<10)
+#define DELTARXBRK (0x01<<11)
static const PinMap PinMap_UART_TX[] = {
{P0_19, UART_0, 1},
{P1_18, UART_0, 2},
{P1_27, UART_0, 2},
-// {P1_18, UART_1, 2},
-// {P1_0 , UART_2, 3},
-// {P1_23, UART_2, 3},
-// {P2_4 , UART_3, 1},
-// {P2_12, UART_4, 1},
+ {P1_8 , UART_1, 2},
+ {P1_0 , UART_2, 3},
+ {P1_23, UART_2, 3},
+ {P2_4 , UART_3, 1},
+ {P2_12, UART_4, 1},
{ NC , NC , 0}
};
@@ -47,11 +61,11 @@
{P0_18, UART_0, 1},
{P1_17, UART_0, 2},
{P1_26, UART_0, 2},
-// {P1_2 , UART_1, 3},
-// {P0_20, UART_2, 2},
-// {P1_6 , UART_2, 2},
-// {P2_3 , UART_3, 1},
-// {P2_11, UART_4, 1},
+ {P1_2 , UART_1, 3},
+ {P0_20, UART_2, 2},
+ {P1_6 , UART_2, 2},
+ {P2_3 , UART_3, 1},
+ {P2_11, UART_4, 1},
{NC , NC , 0}
};
@@ -72,27 +86,55 @@
error("Serial pinout mapping failed");
}
- obj->uart = (LPC_USART0_Type *)uart;
- LPC_SYSCON->SYSAHBCLKCTRL |= ((1<<12) | (1<<20) | (1<<21) | (1<<22));
-
- // [TODO] Consider more elegant approach
- // disconnect USBTX/RX mapping mux, for case when switching ports
-#ifdef USBTX
- pin_function(USBTX, 0);
- pin_function(USBRX, 0);
-#endif
+ switch (uart) {
+ case UART_0:
+ obj->index = 0;
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 12);
+ break;
+ case UART_1:
+ obj->index = 1;
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 20);
+ LPC_SYSCON->PRESETCTRL |= (1 << 5);
+ break;
+ case UART_2:
+ obj->index = 2;
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 21);
+ LPC_SYSCON->PRESETCTRL |= (1 << 6);
+ break;
+ case UART_3:
+ obj->index = 3;
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 22);
+ LPC_SYSCON->PRESETCTRL |= (1 << 7);
+ break;
+ case UART_4:
+ obj->index = 4;
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 22);
+ LPC_SYSCON->PRESETCTRL |= (1 << 8);
+ break;
+ }
- // enable fifos and default rx trigger level
- obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
- | 0 << 1 // Rx Fifo Clear
- | 0 << 2 // Tx Fifo Clear
- | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars
+ if (obj->index == 0)
+ obj->uart = (LPC_USART0_Type *)uart;
+ else
+ obj->mini_uart = (LPC_USART4_Type *)uart;
- // disable irqs
- obj->uart->IER = 0 << 0 // Rx Data available irq enable
- | 0 << 1 // Tx Fifo empty irq enable
- | 0 << 2; // Rx Line Status irq enable
-
+ if (obj->index == 0) {
+ // enable fifos and default rx trigger level
+ obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
+ | 0 << 1 // Rx Fifo Clear
+ | 0 << 2 // Tx Fifo Clear
+ | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars
+ // disable irqs
+ obj->uart->IER = 0 << 0 // Rx Data available irq enable
+ | 0 << 1 // Tx Fifo empty irq enable
+ | 0 << 2; // Rx Line Status irq enable
+ }
+ else {
+ // Clear all status bits
+ obj->mini_uart->STAT = (DELTACTS | DELTARXBRK);
+ // Enable UART
+ obj->mini_uart->CFG |= UART_EN;
+ }
// set default baud rate and format
serial_baud (obj, 9600);
serial_format(obj, 8, ParityNone, 1);
@@ -105,17 +147,9 @@
pin_mode(tx, PullUp);
pin_mode(rx, PullUp);
- switch (uart) {
- case UART_0: obj->index = 0; break;
- case UART_1: obj->index = 1; break;
- case UART_2: obj->index = 2; break;
- case UART_3: obj->index = 3; break;
- case UART_4: obj->index = 4; break;
- }
-
is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
- if (is_stdio_uart) {
+ if (is_stdio_uart && (obj->index == 0)) {
stdio_uart_inited = 1;
memcpy(&stdio_uart, obj, sizeof(serial_t));
}
@@ -128,80 +162,93 @@
// serial_baud
// set the baud rate, taking in to account the current SystemFrequency
void serial_baud(serial_t *obj, int baudrate) {
- LPC_SYSCON->USART0CLKDIV = 0x1;
- uint32_t PCLK = SystemCoreClock;
- // First we check to see if the basic divide with no DivAddVal/MulVal
- // ratio gives us an integer result. If it does, we set DivAddVal = 0,
- // MulVal = 1. Otherwise, we search the valid ratio value range to find
- // the closest match. This could be more elegant, using search methods
- // and/or lookup tables, but the brute force method is not that much
- // slower, and is more maintainable.
- uint16_t DL = PCLK / (16 * baudrate);
-
- uint8_t DivAddVal = 0;
- uint8_t MulVal = 1;
- int hit = 0;
- uint16_t dlv;
- uint8_t mv, dav;
- if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder
- int err_best = baudrate, b;
- for (mv = 1; mv < 16 && !hit; mv++)
- {
- for (dav = 0; dav < mv; dav++)
+ LPC_SYSCON->USART0CLKDIV = 1;
+ LPC_SYSCON->FRGCLKDIV = 1;
+
+ if (obj->index == 0) {
+ uint32_t PCLK = SystemCoreClock;
+ // First we check to see if the basic divide with no DivAddVal/MulVal
+ // ratio gives us an integer result. If it does, we set DivAddVal = 0,
+ // MulVal = 1. Otherwise, we search the valid ratio value range to find
+ // the closest match. This could be more elegant, using search methods
+ // and/or lookup tables, but the brute force method is not that much
+ // slower, and is more maintainable.
+ uint16_t DL = PCLK / (16 * baudrate);
+
+ uint8_t DivAddVal = 0;
+ uint8_t MulVal = 1;
+ int hit = 0;
+ uint16_t dlv;
+ uint8_t mv, dav;
+ if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder
+ int err_best = baudrate, b;
+ for (mv = 1; mv < 16 && !hit; mv++)
{
- // baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul))
- // solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul))
- // mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding
- // for many values of mul and PCLK we have 2 or more bits of headroom which can be used to improve precision
- // note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding
+ for (dav = 0; dav < mv; dav++)
+ {
+ // baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul))
+ // solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul))
+ // mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding
+ // for many values of mul and PCLK we have 2 or more bits of headroom which can be used to improve precision
+ // note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding
- if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom
- dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2;
- else // 2 bits headroom, use more precision
- dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2;
+ if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom
+ dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2;
+ else // 2 bits headroom, use more precision
+ dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2;
- // datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood
- if (dlv == 0)
- dlv = 1;
+ // datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood
+ if (dlv == 0)
+ dlv = 1;
- // datasheet says if dav > 0 then DL must be >= 2
- if ((dav > 0) && (dlv < 2))
- dlv = 2;
+ // datasheet says if dav > 0 then DL must be >= 2
+ if ((dav > 0) && (dlv < 2))
+ dlv = 2;
+
+ // integer rearrangement of the baudrate equation (with rounding)
+ b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2;
- // integer rearrangement of the baudrate equation (with rounding)
- b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2;
-
- // check to see how we went
- b = abs(b - baudrate);
- if (b < err_best)
- {
- err_best = b;
+ // check to see how we went
+ b = abs(b - baudrate);
+ if (b < err_best)
+ {
+ err_best = b;
- DL = dlv;
- MulVal = mv;
- DivAddVal = dav;
+ DL = dlv;
+ MulVal = mv;
+ DivAddVal = dav;
- if (b == baudrate)
- {
- hit = 1;
- break;
+ if (b == baudrate)
+ {
+ hit = 1;
+ break;
+ }
}
}
}
}
+
+ // set LCR[DLAB] to enable writing to divider registers
+ obj->uart->LCR |= (1 << 7);
+
+ // set divider values
+ obj->uart->DLM = (DL >> 8) & 0xFF;
+ obj->uart->DLL = (DL >> 0) & 0xFF;
+ obj->uart->FDR = (uint32_t) DivAddVal << 0
+ | (uint32_t) MulVal << 4;
+
+ // clear LCR[DLAB]
+ obj->uart->LCR &= ~(1 << 7);
}
-
- // set LCR[DLAB] to enable writing to divider registers
- obj->uart->LCR |= (1 << 7);
-
- // set divider values
- obj->uart->DLM = (DL >> 8) & 0xFF;
- obj->uart->DLL = (DL >> 0) & 0xFF;
- obj->uart->FDR = (uint32_t) DivAddVal << 0
- | (uint32_t) MulVal << 4;
-
- // clear LCR[DLAB]
- obj->uart->LCR &= ~(1 << 7);
+ else {
+ uint32_t UARTSysClk = SystemCoreClock / LPC_SYSCON->FRGCLKDIV;
+ obj->mini_uart->BRG = UARTSysClk / 16 / baudrate - 1;
+
+ LPC_SYSCON->UARTFRGDIV = 0xFF;
+ LPC_SYSCON->UARTFRGMULT = ( ((UARTSysClk / 16) * (LPC_SYSCON->UARTFRGDIV + 1)) /
+ (baudrate * (obj->mini_uart->BRG + 1))
+ ) - (LPC_SYSCON->UARTFRGDIV + 1);
+ }
}
void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
@@ -211,35 +258,57 @@
}
stop_bits -= 1;
- // 0: 5 data bits ... 3: 8 data bits
- if (data_bits < 5 || data_bits > 8) {
- error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits);
+ if (obj->index == 0) {
+ // 0: 5 data bits ... 3: 8 data bits
+ if (data_bits < 5 || data_bits > 8) {
+ error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits);
+ }
+ data_bits -= 5;
+
+ int parity_enable, parity_select;
+ switch (parity) {
+ case ParityNone: parity_enable = 0; parity_select = 0; break;
+ case ParityOdd : parity_enable = 1; parity_select = 0; break;
+ case ParityEven: parity_enable = 1; parity_select = 1; break;
+ case ParityForced1: parity_enable = 1; parity_select = 2; break;
+ case ParityForced0: parity_enable = 1; parity_select = 3; break;
+ default:
+ error("Invalid serial parity setting");
+ return;
+ }
+
+ obj->uart->LCR = data_bits << 0
+ | stop_bits << 2
+ | parity_enable << 3
+ | parity_select << 4;
}
- data_bits -= 5;
-
- int parity_enable, parity_select;
- switch (parity) {
- case ParityNone: parity_enable = 0; parity_select = 0; break;
- case ParityOdd : parity_enable = 1; parity_select = 0; break;
- case ParityEven: parity_enable = 1; parity_select = 1; break;
- case ParityForced1: parity_enable = 1; parity_select = 2; break;
- case ParityForced0: parity_enable = 1; parity_select = 3; break;
- default:
- error("Invalid serial parity setting");
- return;
+ else {
+ // 0: 7 data bits ... 2: 9 data bits
+ if (data_bits < 7 || data_bits > 9) {
+ error("Invalid number of bits (%d) in serial format, should be 7..9", data_bits);
+ }
+ data_bits -= 7;
+
+ int paritysel;
+ switch (parity) {
+ case ParityNone: paritysel = 0; break;
+ case ParityEven: paritysel = 2; break;
+ case ParityOdd : paritysel = 3; break;
+ default:
+ error("Invalid serial parity setting");
+ return;
+ }
+ obj->mini_uart->CFG = (data_bits << 2)
+ | (paritysel << 4)
+ | (stop_bits << 6)
+ | UART_EN;
}
-
- obj->uart->LCR = data_bits << 0
- | stop_bits << 2
- | parity_enable << 3
- | parity_select << 4;
}
/******************************************************************************
* INTERRUPTS HANDLING
******************************************************************************/
static inline void uart_irq(uint32_t iir, uint32_t index) {
- // [Chapter 14] LPC17xx UART0/2/3: UARTn Interrupt Handling
SerialIrq irq_type;
switch (iir) {
case 1: irq_type = TxIrq; break;
@@ -258,22 +327,22 @@
void uart1_irq()
{
- //uart_irq((LPC_USART4->IIR >> 1) & 0x7, 1);
+ uart_irq((LPC_USART1->STAT & (1 << 2)) ? 2 : 1, 1);
}
void uart2_irq()
{
- //uart_irq((LPC_USART4->IIR >> 1) & 0x7, 2);
+ uart_irq((LPC_USART1->STAT & (1 << 2)) ? 2 : 1, 2);
}
void uart3_irq()
{
- //uart_irq((LPC_USART4->IIR >> 1) & 0x7, 3);
+ uart_irq((LPC_USART1->STAT & (1 << 2)) ? 2 : 1, 3);
}
void uart4_irq()
{
- //uart_irq((LPC_USART4->IIR >> 1) & 0x7, 4);
+ uart_irq((LPC_USART1->STAT & (1 << 2)) ? 2 : 1, 4);
}
void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
@@ -293,16 +362,27 @@
}
if (enable) {
- obj->uart->IER |= (1 << irq);
+ if (obj->index == 0) {
+ obj->uart->IER |= (1 << irq);
+ }
+ else {
+ obj->mini_uart->INTENSET = (1 << ((irq == RxIrq) ? 0 : 2));
+ }
NVIC_SetVector(irq_n, vector);
NVIC_EnableIRQ(irq_n);
} else { // disable
int all_disabled = 0;
SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
- obj->uart->IER &= ~(1 << irq);
- all_disabled = (obj->uart->IER & (1 << other_irq)) == 0;
-
+ if (obj->index == 0) {
+ obj->uart->IER &= ~(1 << irq);
+ all_disabled = (obj->uart->IER & (1 << other_irq)) == 0;
+ }
+ else {
+ obj->mini_uart->INTENSET &= ~(1 << ((irq == RxIrq) ? 0 : 2));
+ all_disabled = (obj->mini_uart->INTENSET & (1 << ((other_irq == RxIrq) ? 0 : 2))) == 0;
+ }
+
if (all_disabled)
NVIC_DisableIRQ(irq_n);
}
@@ -313,26 +393,51 @@
******************************************************************************/
int serial_getc(serial_t *obj) {
while (!serial_readable(obj));
- return obj->uart->RBR;
+ if (obj->index == 0) {
+ return obj->uart->RBR;
+ }
+ else {
+ return obj->mini_uart->RXDAT;
+ }
}
void serial_putc(serial_t *obj, int c) {
while (!serial_writable(obj));
- obj->uart->THR = c;
+ if (obj->index == 0) {
+ obj->uart->THR = c;
+ }
+ else {
+ obj->mini_uart->TXDAT = c;
+ }
}
int serial_readable(serial_t *obj) {
- return obj->uart->LSR & 0x01;
+ if (obj->index == 0) {
+ return obj->uart->LSR & 0x01;
+ }
+ else {
+ return obj->mini_uart->STAT & RXRDY;
+ }
}
int serial_writable(serial_t *obj) {
- return obj->uart->LSR & 0x20;
+ if (obj->index == 0) {
+ return obj->uart->LSR & 0x20;
+ }
+ else {
+ return obj->mini_uart->STAT & TXRDY;
+ }
}
void serial_clear(serial_t *obj) {
- obj->uart->FCR = 1 << 1 // rx FIFO reset
- | 1 << 2 // tx FIFO reset
- | 0 << 6; // interrupt depth
+ if (obj->index == 0) {
+ obj->uart->FCR = 1 << 1 // rx FIFO reset
+ | 1 << 2 // tx FIFO reset
+ | 0 << 6; // interrupt depth
+ }
+ else {
+ obj->mini_uart->STAT = 0;
+ }
}
void serial_pinout_tx(PinName tx) {
@@ -340,11 +445,21 @@
}
void serial_break_set(serial_t *obj) {
- obj->uart->LCR |= (1 << 6);
+ if (obj->index == 0) {
+ obj->uart->LCR |= (1 << 6);
+ }
+ else {
+ obj->mini_uart->CTL |= TXBRKEN;
+ }
}
void serial_break_clear(serial_t *obj) {
- obj->uart->LCR &= ~(1 << 6);
+ if (obj->index == 0) {
+ obj->uart->LCR &= ~(1 << 6);
+ }
+ else {
+ obj->mini_uart->CTL &= ~TXBRKEN;
+ }
}