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- #include "kinetis.h"
- #include "core_pins.h"
- #include "HardwareSerial.h"
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-
-
- #define TX_BUFFER_SIZE 40
- #define RX_BUFFER_SIZE 64
- #define RTS_HIGH_WATERMARK 40
- #define RTS_LOW_WATERMARK 26
- #define IRQ_PRIORITY 64
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-
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- #ifdef SERIAL_9BIT_SUPPORT
- static uint8_t use9Bits = 0;
- #define BUFTYPE uint16_t
- #else
- #define BUFTYPE uint8_t
- #define use9Bits 0
- #endif
-
- static volatile BUFTYPE tx_buffer[TX_BUFFER_SIZE];
- static volatile BUFTYPE rx_buffer[RX_BUFFER_SIZE];
- static volatile uint8_t transmitting = 0;
- #if defined(KINETISK)
- static volatile uint8_t *transmit_pin=NULL;
- #define transmit_assert() *transmit_pin = 1
- #define transmit_deassert() *transmit_pin = 0
- static volatile uint8_t *rts_pin=NULL;
- #define rts_assert() *rts_pin = 0
- #define rts_deassert() *rts_pin = 1
- #elif defined(KINETISL)
- static volatile uint8_t *transmit_pin=NULL;
- static uint8_t transmit_mask=0;
- #define transmit_assert() *(transmit_pin+4) = transmit_mask;
- #define transmit_deassert() *(transmit_pin+8) = transmit_mask;
- static volatile uint8_t *rts_pin=NULL;
- static uint8_t rts_mask=0;
- #define rts_assert() *(rts_pin+8) = rts_mask;
- #define rts_deassert() *(rts_pin+4) = rts_mask;
- #endif
- #if TX_BUFFER_SIZE > 255
- static volatile uint16_t tx_buffer_head = 0;
- static volatile uint16_t tx_buffer_tail = 0;
- #else
- static volatile uint8_t tx_buffer_head = 0;
- static volatile uint8_t tx_buffer_tail = 0;
- #endif
- #if RX_BUFFER_SIZE > 255
- static volatile uint16_t rx_buffer_head = 0;
- static volatile uint16_t rx_buffer_tail = 0;
- #else
- static volatile uint8_t rx_buffer_head = 0;
- static volatile uint8_t rx_buffer_tail = 0;
- #endif
- #if defined(KINETISL)
- static uint8_t rx_pin_num = 7;
- static uint8_t tx_pin_num = 8;
- #endif
-
-
-
-
- #define C2_ENABLE UART_C2_TE | UART_C2_RE | UART_C2_RIE
- #define C2_TX_ACTIVE C2_ENABLE | UART_C2_TIE
- #define C2_TX_COMPLETING C2_ENABLE | UART_C2_TCIE
- #define C2_TX_INACTIVE C2_ENABLE
-
- void serial3_begin(uint32_t divisor)
- {
- SIM_SCGC4 |= SIM_SCGC4_UART2;
- rx_buffer_head = 0;
- rx_buffer_tail = 0;
- tx_buffer_head = 0;
- tx_buffer_tail = 0;
- transmitting = 0;
- #if defined(KINETISK)
- CORE_PIN7_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(3);
- CORE_PIN8_CONFIG = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3);
- #elif defined(KINETISL)
- switch (rx_pin_num) {
- case 7: CORE_PIN7_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(3); break;
- case 6: CORE_PIN6_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(3); break;
- }
- switch (tx_pin_num) {
- case 8: CORE_PIN8_CONFIG = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); break;
- case 20: CORE_PIN20_CONFIG = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); break;
- }
- #endif
- #if defined(HAS_KINETISK_UART2)
- UART2_BDH = (divisor >> 13) & 0x1F;
- UART2_BDL = (divisor >> 5) & 0xFF;
- UART2_C4 = divisor & 0x1F;
- UART2_C1 = 0;
- UART2_PFIFO = 0;
- #elif defined(HAS_KINETISL_UART2)
- UART2_BDH = (divisor >> 8) & 0x1F;
- UART2_BDL = divisor & 0xFF;
- UART2_C1 = 0;
- #endif
- UART2_C2 = C2_TX_INACTIVE;
- NVIC_SET_PRIORITY(IRQ_UART2_STATUS, IRQ_PRIORITY);
- NVIC_ENABLE_IRQ(IRQ_UART2_STATUS);
- }
-
- void serial3_format(uint32_t format)
- {
- uint8_t c;
-
- c = UART2_C1;
- c = (c & ~0x13) | (format & 0x03);
- if (format & 0x04) c |= 0x10;
- UART2_C1 = c;
- if ((format & 0x0F) == 0x04) UART2_C3 |= 0x40;
- c = UART2_S2 & ~0x10;
- if (format & 0x10) c |= 0x10;
- UART2_S2 = c;
- c = UART2_C3 & ~0x10;
- if (format & 0x20) c |= 0x10;
- UART2_C3 = c;
- #ifdef SERIAL_9BIT_SUPPORT
- c = UART2_C4 & 0x1F;
- if (format & 0x08) c |= 0x20;
- UART2_C4 = c;
- use9Bits = format & 0x80;
- #endif
- }
-
- void serial3_end(void)
- {
- if (!(SIM_SCGC4 & SIM_SCGC4_UART2)) return;
- while (transmitting) yield();
- NVIC_DISABLE_IRQ(IRQ_UART2_STATUS);
- UART2_C2 = 0;
- CORE_PIN7_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_MUX(1);
- CORE_PIN8_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_MUX(1);
- rx_buffer_head = 0;
- rx_buffer_tail = 0;
- if (rts_pin) rts_deassert();
- }
-
- void serial3_set_transmit_pin(uint8_t pin)
- {
- while (transmitting) ;
- pinMode(pin, OUTPUT);
- digitalWrite(pin, LOW);
- transmit_pin = portOutputRegister(pin);
- #if defined(KINETISL)
- transmit_mask = digitalPinToBitMask(pin);
- #endif
- }
-
- void serial3_set_tx(uint8_t pin, uint8_t opendrain)
- {
- #if defined(KINETISL)
- uint32_t cfg;
-
- if (opendrain) pin |= 128;
- if (pin == tx_pin_num) return;
- if ((SIM_SCGC4 & SIM_SCGC4_UART2)) {
- switch (tx_pin_num & 127) {
- case 8: CORE_PIN8_CONFIG = 0; break;
- case 20: CORE_PIN20_CONFIG = 0; break;
- }
- if (opendrain) {
- cfg = PORT_PCR_DSE | PORT_PCR_ODE;
- } else {
- cfg = PORT_PCR_DSE | PORT_PCR_SRE;
- }
- switch (pin & 127) {
- case 8: CORE_PIN8_CONFIG = cfg | PORT_PCR_MUX(3); break;
- case 20: CORE_PIN20_CONFIG = cfg | PORT_PCR_MUX(3); break;
- }
- }
- tx_pin_num = pin;
- #endif
- }
-
- void serial3_set_rx(uint8_t pin)
- {
- #if defined(KINETISL)
- if (pin == rx_pin_num) return;
- if ((SIM_SCGC4 & SIM_SCGC4_UART2)) {
- switch (rx_pin_num) {
- case 7: CORE_PIN7_CONFIG = 0; break;
- case 6: CORE_PIN6_CONFIG = 0; break;
- }
- switch (pin) {
- case 7: CORE_PIN7_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(3); break;
- case 6: CORE_PIN6_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(3); break;
- }
- }
- rx_pin_num = pin;
- #endif
- }
-
- int serial3_set_rts(uint8_t pin)
- {
- if (!(SIM_SCGC4 & SIM_SCGC4_UART2)) return 0;
- if (pin < CORE_NUM_DIGITAL) {
- rts_pin = portOutputRegister(pin);
- #if defined(KINETISL)
- rts_mask = digitalPinToBitMask(pin);
- #endif
- pinMode(pin, OUTPUT);
- rts_assert();
- } else {
- rts_pin = NULL;
- return 0;
- }
-
- return 1;
- }
-
- int serial3_set_cts(uint8_t pin)
- {
- #if defined(KINETISK)
- if (!(SIM_SCGC4 & SIM_SCGC4_UART2)) return 0;
- if (pin == 14) {
- CORE_PIN14_CONFIG = PORT_PCR_MUX(3) | PORT_PCR_PE;
- } else {
- UART2_MODEM &= ~UART_MODEM_TXCTSE;
- return 0;
- }
- UART2_MODEM |= UART_MODEM_TXCTSE;
- return 1;
- #else
- return 0;
- #endif
- }
-
- void serial3_putchar(uint32_t c)
- {
- uint32_t head, n;
-
- if (!(SIM_SCGC4 & SIM_SCGC4_UART2)) return;
- if (transmit_pin) transmit_assert();
- head = tx_buffer_head;
- if (++head >= TX_BUFFER_SIZE) head = 0;
- while (tx_buffer_tail == head) {
- int priority = nvic_execution_priority();
- if (priority <= IRQ_PRIORITY) {
- if ((UART2_S1 & UART_S1_TDRE)) {
- uint32_t tail = tx_buffer_tail;
- if (++tail >= TX_BUFFER_SIZE) tail = 0;
- n = tx_buffer[tail];
- if (use9Bits) UART2_C3 = (UART2_C3 & ~0x40) | ((n & 0x100) >> 2);
- UART2_D = n;
- tx_buffer_tail = tail;
- }
- } else if (priority >= 256) {
- yield();
- }
- }
- tx_buffer[head] = c;
- transmitting = 1;
- tx_buffer_head = head;
- UART2_C2 = C2_TX_ACTIVE;
- }
-
- void serial3_write(const void *buf, unsigned int count)
- {
- const uint8_t *p = (const uint8_t *)buf;
- while (count-- > 0) serial3_putchar(*p++);
- }
-
- void serial3_flush(void)
- {
- while (transmitting) yield();
- }
-
- int serial3_write_buffer_free(void)
- {
- uint32_t head, tail;
-
- head = tx_buffer_head;
- tail = tx_buffer_tail;
- if (head >= tail) return TX_BUFFER_SIZE - 1 - head + tail;
- return tail - head - 1;
- }
-
- int serial3_available(void)
- {
- uint32_t head, tail;
-
- head = rx_buffer_head;
- tail = rx_buffer_tail;
- if (head >= tail) return head - tail;
- return RX_BUFFER_SIZE + head - tail;
- }
-
- int serial3_getchar(void)
- {
- uint32_t head, tail;
- int c;
-
- head = rx_buffer_head;
- tail = rx_buffer_tail;
- if (head == tail) return -1;
- if (++tail >= RX_BUFFER_SIZE) tail = 0;
- c = rx_buffer[tail];
- rx_buffer_tail = tail;
- if (rts_pin) {
- int avail;
- if (head >= tail) avail = head - tail;
- else avail = RX_BUFFER_SIZE + head - tail;
- if (avail <= RTS_LOW_WATERMARK) rts_assert();
- }
- return c;
- }
-
- int serial3_peek(void)
- {
- uint32_t head, tail;
-
- head = rx_buffer_head;
- tail = rx_buffer_tail;
- if (head == tail) return -1;
- if (++tail >= RX_BUFFER_SIZE) tail = 0;
- return rx_buffer[tail];
- }
-
- void serial3_clear(void)
- {
- rx_buffer_head = rx_buffer_tail;
- if (rts_pin) rts_assert();
- }
-
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-
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- void uart2_status_isr(void)
- {
- uint32_t head, tail, n;
- uint8_t c;
-
- if (UART2_S1 & UART_S1_RDRF) {
- if (use9Bits && (UART2_C3 & 0x80)) {
- n = UART2_D | 0x100;
- } else {
- n = UART2_D;
- }
- head = rx_buffer_head + 1;
- if (head >= RX_BUFFER_SIZE) head = 0;
- if (head != rx_buffer_tail) {
- rx_buffer[head] = n;
- rx_buffer_head = head;
- }
- if (rts_pin) {
- int avail;
- tail = tx_buffer_tail;
- if (head >= tail) avail = head - tail;
- else avail = RX_BUFFER_SIZE + head - tail;
- if (avail >= RTS_HIGH_WATERMARK) rts_deassert();
- }
- }
- c = UART2_C2;
- if ((c & UART_C2_TIE) && (UART2_S1 & UART_S1_TDRE)) {
- head = tx_buffer_head;
- tail = tx_buffer_tail;
- if (head == tail) {
- UART2_C2 = C2_TX_COMPLETING;
- } else {
- if (++tail >= TX_BUFFER_SIZE) tail = 0;
- n = tx_buffer[tail];
- if (use9Bits) UART2_C3 = (UART2_C3 & ~0x40) | ((n & 0x100) >> 2);
- UART2_D = n;
- tx_buffer_tail = tail;
- }
- }
- if ((c & UART_C2_TCIE) && (UART2_S1 & UART_S1_TC)) {
- transmitting = 0;
- if (transmit_pin) transmit_deassert();
- UART2_C2 = C2_TX_INACTIVE;
- }
- }
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