diff options
Diffstat (limited to 'code/fe310/eos/uart.c')
| -rw-r--r-- | code/fe310/eos/uart.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/code/fe310/eos/uart.c b/code/fe310/eos/uart.c new file mode 100644 index 0000000..88931ab --- /dev/null +++ b/code/fe310/eos/uart.c @@ -0,0 +1,100 @@ +#include <stdlib.h> +#include <stdint.h> +#include <string.h> + +#include "encoding.h" +#include "platform.h" + +#include "eos.h" +#include "interrupt.h" +#include "event.h" + +#include "uart.h" +#include "irq_def.h" + +static eos_uart_fptr_t uart_handler[EOS_UART_MAX_ETYPE]; + +static void uart_handler_evt(unsigned char type, unsigned char *buffer, uint16_t len) { + unsigned char idx = (type & ~EOS_EVT_MASK) - 1; + + if ((idx < EOS_UART_MAX_ETYPE) && uart_handler[idx]) { + uart_handler[idx](type); + } else { + eos_evtq_bad_handler(type, buffer, len); + } +} + +static void uart_handler_intr(void) { + if (UART0_REG(UART_REG_IP) & UART_IP_TXWM) { + UART0_REG(UART_REG_IE) &= ~UART_IP_TXWM; + eos_evtq_push_isr(EOS_EVT_UART | EOS_UART_ETYPE_TX, NULL, 0); + } + if (UART0_REG(UART_REG_IP) & UART_IP_RXWM) { + UART0_REG(UART_REG_IE) &= ~UART_IP_RXWM; + eos_evtq_push_isr(EOS_EVT_UART | EOS_UART_ETYPE_RX, NULL, 0); + } +} + +void eos_uart_init(void) { + int i; + + for (i=0; i<EOS_UART_MAX_ETYPE; i++) { + uart_handler[i] = NULL; + } + eos_evtq_set_handler(EOS_EVT_UART, uart_handler_evt); + eos_intr_set(INT_UART0_BASE, IRQ_PRIORITY_UART, uart_handler_intr); +} + +void eos_uart_set_handler(unsigned char type, eos_uart_fptr_t handler, uint8_t flags) { + if (type && (type <= EOS_UART_MAX_ETYPE)) { + type--; + } else { + return; + } + uart_handler[type] = handler; + + if (flags) eos_evtq_set_flags(EOS_EVT_UART | type + 1, flags); +} + +void eos_uart_txwm_set(uint8_t wm) { + UART0_REG(UART_REG_TXCTRL) &= ~UART_TXWM(0xFFFF); + UART0_REG(UART_REG_TXCTRL) |= UART_TXWM(wm); + UART0_REG(UART_REG_IE) |= UART_IP_TXWM; +} + +void eos_uart_txwm_clear(void) { + UART0_REG(UART_REG_IE) &= ~UART_IP_TXWM; +} + +void eos_uart_rxwm_set(uint8_t wm) { + UART0_REG(UART_REG_RXCTRL) &= ~UART_RXWM(0xFFFF); + UART0_REG(UART_REG_RXCTRL) |= UART_RXWM(wm); + UART0_REG(UART_REG_IE) |= UART_IP_RXWM; +} + +void eos_uart_rxwm_clear(void) { + UART0_REG(UART_REG_IE) &= ~UART_IP_RXWM; +} + +int eos_uart_putc(int c, char b) { + if (b) { + while (UART0_REG(UART_REG_TXFIFO) & 0x80000000); + UART0_REG(UART_REG_TXFIFO) = c & 0xff; + } else { + if (UART0_REG(UART_REG_TXFIFO) & 0x80000000) return EOS_ERR_FULL; + UART0_REG(UART_REG_TXFIFO) = c & 0xff; + } + return EOS_OK; +} + +int eos_uart_getc(char b) { + volatile uint32_t r; + + if (b) { + while ((r = UART0_REG(UART_REG_RXFIFO)) & 0x80000000); + } else { + r = UART0_REG(UART_REG_RXFIFO); + if (r & 0x80000000) return EOS_ERR_EMPTY; + } + return r & 0xff; +}
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