mirror of https://github.com/ARMmbed/mbed-os.git
Merge branch 'master' of github.com:mbedmicro/mbed
Bogdan Marinescu
commit
bcacbb9fbf
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@ -41,6 +41,7 @@ struct pwmout_s {
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#if DEVICE_SERIAL
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struct serial_s {
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LPC_USART0_Type *uart;
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LPC_USART4_Type *mini_uart;
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unsigned char index;
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};
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#endif
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@ -13,6 +13,7 @@
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// math.h required for floating point operations for baud rate calculation
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#include <math.h>
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#include <string.h>
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@ -24,22 +25,35 @@
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#include "error.h"
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#if DEVICE_SERIAL
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#warning "[TODO] support from UART_1 to UART_4"
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/******************************************************************************
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* INITIALIZATION
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******************************************************************************/
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#define UART_NUM 1
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#define UART_NUM 5
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// CFG
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#define UART_EN (0x01<<0)
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// CTL
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#define TXBRKEN (0x01<<1)
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// STAT
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#define RXRDY (0x01<<0)
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#define TXRDY (0x01<<2)
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#define DELTACTS (0x01<<5)
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#define RXBRK (0x01<<10)
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#define DELTARXBRK (0x01<<11)
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static const PinMap PinMap_UART_TX[] = {
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{P0_19, UART_0, 1},
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{P1_18, UART_0, 2},
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{P1_27, UART_0, 2},
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// {P1_18, UART_1, 2},
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// {P1_0 , UART_2, 3},
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// {P1_23, UART_2, 3},
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// {P2_4 , UART_3, 1},
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// {P2_12, UART_4, 1},
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{P1_8 , UART_1, 2},
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{P1_0 , UART_2, 3},
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{P1_23, UART_2, 3},
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{P2_4 , UART_3, 1},
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{P2_12, UART_4, 1},
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{ NC , NC , 0}
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};
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@ -47,11 +61,11 @@ static const PinMap PinMap_UART_RX[] = {
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{P0_18, UART_0, 1},
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{P1_17, UART_0, 2},
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{P1_26, UART_0, 2},
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// {P1_2 , UART_1, 3},
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// {P0_20, UART_2, 2},
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// {P1_6 , UART_2, 2},
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// {P2_3 , UART_3, 1},
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// {P2_11, UART_4, 1},
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{P1_2 , UART_1, 3},
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{P0_20, UART_2, 2},
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{P1_6 , UART_2, 2},
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{P2_3 , UART_3, 1},
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{P2_11, UART_4, 1},
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{NC , NC , 0}
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};
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@ -72,27 +86,55 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
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error("Serial pinout mapping failed");
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}
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obj->uart = (LPC_USART0_Type *)uart;
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LPC_SYSCON->SYSAHBCLKCTRL |= ((1<<12) | (1<<20) | (1<<21) | (1<<22));
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// [TODO] Consider more elegant approach
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// disconnect USBTX/RX mapping mux, for case when switching ports
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#ifdef USBTX
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pin_function(USBTX, 0);
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pin_function(USBRX, 0);
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#endif
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switch (uart) {
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case UART_0:
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obj->index = 0;
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 12);
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break;
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case UART_1:
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obj->index = 1;
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 20);
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LPC_SYSCON->PRESETCTRL |= (1 << 5);
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break;
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case UART_2:
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obj->index = 2;
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 21);
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LPC_SYSCON->PRESETCTRL |= (1 << 6);
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break;
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case UART_3:
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obj->index = 3;
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 22);
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LPC_SYSCON->PRESETCTRL |= (1 << 7);
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break;
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case UART_4:
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obj->index = 4;
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 22);
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LPC_SYSCON->PRESETCTRL |= (1 << 8);
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break;
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}
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// enable fifos and default rx trigger level
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obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
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| 0 << 1 // Rx Fifo Clear
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| 0 << 2 // Tx Fifo Clear
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| 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars
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// disable irqs
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obj->uart->IER = 0 << 0 // Rx Data available irq enable
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| 0 << 1 // Tx Fifo empty irq enable
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| 0 << 2; // Rx Line Status irq enable
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if (obj->index == 0)
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obj->uart = (LPC_USART0_Type *)uart;
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else
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obj->mini_uart = (LPC_USART4_Type *)uart;
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if (obj->index == 0) {
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// enable fifos and default rx trigger level
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obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
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| 0 << 1 // Rx Fifo Clear
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| 0 << 2 // Tx Fifo Clear
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| 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars
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// disable irqs
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obj->uart->IER = 0 << 0 // Rx Data available irq enable
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| 0 << 1 // Tx Fifo empty irq enable
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| 0 << 2; // Rx Line Status irq enable
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}
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else {
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// Clear all status bits
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obj->mini_uart->STAT = (DELTACTS | DELTARXBRK);
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// Enable UART
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obj->mini_uart->CFG |= UART_EN;
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}
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// set default baud rate and format
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serial_baud (obj, 9600);
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serial_format(obj, 8, ParityNone, 1);
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@ -105,17 +147,9 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
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pin_mode(tx, PullUp);
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pin_mode(rx, PullUp);
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switch (uart) {
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case UART_0: obj->index = 0; break;
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case UART_1: obj->index = 1; break;
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case UART_2: obj->index = 2; break;
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case UART_3: obj->index = 3; break;
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case UART_4: obj->index = 4; break;
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}
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is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
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if (is_stdio_uart) {
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if (is_stdio_uart && (obj->index == 0)) {
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stdio_uart_inited = 1;
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memcpy(&stdio_uart, obj, sizeof(serial_t));
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}
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@ -128,80 +162,93 @@ void serial_free(serial_t *obj) {
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// serial_baud
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// set the baud rate, taking in to account the current SystemFrequency
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void serial_baud(serial_t *obj, int baudrate) {
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LPC_SYSCON->USART0CLKDIV = 0x1;
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uint32_t PCLK = SystemCoreClock;
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// First we check to see if the basic divide with no DivAddVal/MulVal
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// ratio gives us an integer result. If it does, we set DivAddVal = 0,
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// MulVal = 1. Otherwise, we search the valid ratio value range to find
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// the closest match. This could be more elegant, using search methods
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// and/or lookup tables, but the brute force method is not that much
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// slower, and is more maintainable.
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uint16_t DL = PCLK / (16 * baudrate);
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uint8_t DivAddVal = 0;
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uint8_t MulVal = 1;
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int hit = 0;
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uint16_t dlv;
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uint8_t mv, dav;
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if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder
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int err_best = baudrate, b;
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for (mv = 1; mv < 16 && !hit; mv++)
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{
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for (dav = 0; dav < mv; dav++)
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LPC_SYSCON->USART0CLKDIV = 1;
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LPC_SYSCON->FRGCLKDIV = 1;
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if (obj->index == 0) {
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uint32_t PCLK = SystemCoreClock;
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// First we check to see if the basic divide with no DivAddVal/MulVal
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// ratio gives us an integer result. If it does, we set DivAddVal = 0,
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// MulVal = 1. Otherwise, we search the valid ratio value range to find
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// the closest match. This could be more elegant, using search methods
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// and/or lookup tables, but the brute force method is not that much
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// slower, and is more maintainable.
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uint16_t DL = PCLK / (16 * baudrate);
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uint8_t DivAddVal = 0;
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uint8_t MulVal = 1;
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int hit = 0;
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uint16_t dlv;
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uint8_t mv, dav;
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if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder
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int err_best = baudrate, b;
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for (mv = 1; mv < 16 && !hit; mv++)
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{
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// baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul))
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// solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul))
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// mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding
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// for many values of mul and PCLK we have 2 or more bits of headroom which can be used to improve precision
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// note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding
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if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom
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dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2;
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else // 2 bits headroom, use more precision
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dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2;
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// datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood
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if (dlv == 0)
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dlv = 1;
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// datasheet says if dav > 0 then DL must be >= 2
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if ((dav > 0) && (dlv < 2))
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dlv = 2;
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// integer rearrangement of the baudrate equation (with rounding)
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b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2;
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// check to see how we went
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b = abs(b - baudrate);
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if (b < err_best)
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for (dav = 0; dav < mv; dav++)
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{
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err_best = b;
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// baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul))
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// solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul))
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// mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding
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// for many values of mul and PCLK we have 2 or more bits of headroom which can be used to improve precision
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// note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding
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DL = dlv;
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MulVal = mv;
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DivAddVal = dav;
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if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom
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dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2;
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else // 2 bits headroom, use more precision
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dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2;
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if (b == baudrate)
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// datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood
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if (dlv == 0)
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dlv = 1;
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// datasheet says if dav > 0 then DL must be >= 2
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if ((dav > 0) && (dlv < 2))
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dlv = 2;
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// integer rearrangement of the baudrate equation (with rounding)
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b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2;
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// check to see how we went
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b = abs(b - baudrate);
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if (b < err_best)
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{
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hit = 1;
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break;
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err_best = b;
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DL = dlv;
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MulVal = mv;
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DivAddVal = dav;
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if (b == baudrate)
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{
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hit = 1;
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break;
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}
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}
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}
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}
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}
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// set LCR[DLAB] to enable writing to divider registers
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obj->uart->LCR |= (1 << 7);
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// set divider values
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obj->uart->DLM = (DL >> 8) & 0xFF;
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obj->uart->DLL = (DL >> 0) & 0xFF;
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obj->uart->FDR = (uint32_t) DivAddVal << 0
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| (uint32_t) MulVal << 4;
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// clear LCR[DLAB]
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obj->uart->LCR &= ~(1 << 7);
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}
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else {
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uint32_t UARTSysClk = SystemCoreClock / LPC_SYSCON->FRGCLKDIV;
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obj->mini_uart->BRG = UARTSysClk / 16 / baudrate - 1;
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LPC_SYSCON->UARTFRGDIV = 0xFF;
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LPC_SYSCON->UARTFRGMULT = ( ((UARTSysClk / 16) * (LPC_SYSCON->UARTFRGDIV + 1)) /
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(baudrate * (obj->mini_uart->BRG + 1))
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) - (LPC_SYSCON->UARTFRGDIV + 1);
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}
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// set LCR[DLAB] to enable writing to divider registers
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obj->uart->LCR |= (1 << 7);
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// set divider values
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obj->uart->DLM = (DL >> 8) & 0xFF;
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obj->uart->DLL = (DL >> 0) & 0xFF;
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obj->uart->FDR = (uint32_t) DivAddVal << 0
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| (uint32_t) MulVal << 4;
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// clear LCR[DLAB]
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obj->uart->LCR &= ~(1 << 7);
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}
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void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
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@ -211,35 +258,57 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
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}
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stop_bits -= 1;
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// 0: 5 data bits ... 3: 8 data bits
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if (data_bits < 5 || data_bits > 8) {
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error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits);
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}
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data_bits -= 5;
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int parity_enable, parity_select;
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switch (parity) {
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case ParityNone: parity_enable = 0; parity_select = 0; break;
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case ParityOdd : parity_enable = 1; parity_select = 0; break;
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case ParityEven: parity_enable = 1; parity_select = 1; break;
|
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case ParityForced1: parity_enable = 1; parity_select = 2; break;
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case ParityForced0: parity_enable = 1; parity_select = 3; break;
|
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default:
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error("Invalid serial parity setting");
|
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return;
|
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}
|
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if (obj->index == 0) {
|
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// 0: 5 data bits ... 3: 8 data bits
|
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if (data_bits < 5 || data_bits > 8) {
|
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error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits);
|
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}
|
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data_bits -= 5;
|
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|
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obj->uart->LCR = data_bits << 0
|
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| stop_bits << 2
|
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| parity_enable << 3
|
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| parity_select << 4;
|
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int parity_enable, parity_select;
|
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switch (parity) {
|
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case ParityNone: parity_enable = 0; parity_select = 0; break;
|
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case ParityOdd : parity_enable = 1; parity_select = 0; break;
|
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case ParityEven: parity_enable = 1; parity_select = 1; break;
|
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case ParityForced1: parity_enable = 1; parity_select = 2; break;
|
||||
case ParityForced0: parity_enable = 1; parity_select = 3; break;
|
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default:
|
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error("Invalid serial parity setting");
|
||||
return;
|
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}
|
||||
|
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obj->uart->LCR = data_bits << 0
|
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| stop_bits << 2
|
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| parity_enable << 3
|
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| parity_select << 4;
|
||||
}
|
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else {
|
||||
// 0: 7 data bits ... 2: 9 data bits
|
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if (data_bits < 7 || data_bits > 9) {
|
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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;
|
||||
}
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
* 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 uart0_irq()
|
|||
|
||||
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 @@ void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
|
|||
}
|
||||
|
||||
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 @@ void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
|
|||
******************************************************************************/
|
||||
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_pinout_tx(PinName tx) {
|
|||
}
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue