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   1 /*
   2  * Copyright © 2013 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 #include <ao.h>
  19 #include <ao_serial.h>
  20
  21 struct ao_fifo  ao_usart_rx_fifo;
  22 struct ao_fifo  ao_usart_tx_fifo;
  23 uint8_t         ao_usart_tx_started;
  24
  25 void
  26 ao_debug_out(char c)
  27 {
  28         if (c == '\n')
  29                 ao_debug_out('\r');
  30 #if 0
  31         while (!(stm_usart1.sr & (1 << STM_USART_SR_TXE)));
  32         stm_usart1.dr = c;
  33 #endif
  34 }
  35
  36 static void
  37 _ao_serial_tx_start(void)
  38 {
  39         if (!ao_fifo_empty(ao_usart_tx_fifo) & !ao_usart_tx_started)
  40         {
  41                 ao_usart_tx_started = 1;
  42 #if 0
  43                 ao_fifo_remove(ao_usart_tx_fifo, usart->reg->dr);
  44 #endif
  45         }
  46 }
  47
  48 void
  49 lpc_usart_isr(void)
  50 {
  51 #if 0
  52         uint32_t        sr;
  53
  54         sr = usart->reg->sr;
  55         usart->reg->sr = 0;
  56
  57         if (sr & (1 << STM_USART_SR_RXNE)) {
  58                 char c = usart->reg->dr;
  59                 if (!ao_fifo_full(ao_usart_rx_fifo))
  60                         ao_fifo_insert(ao_usart_rx_fifo, c);
  61                 ao_wakeup(ao_usart_rx_fifo);
  62                 if (stdin)
  63                         ao_wakeup(&ao_stdin_ready);
  64         }
  65         if (sr & (1 << STM_USART_SR_TC)) {
  66                 ao_usart_tx_started = 0;
  67                 _ao_usart_tx_start(usart);
  68                 ao_wakeup(ao_usart_tx_fifo);
  69         }
  70 #endif
  71 }
  72
  73 int
  74 _ao_serial_pollchar(void)
  75 {
  76         int     c;
  77
  78         if (ao_fifo_empty(ao_usart_rx_fifo))
  79                 c = AO_READ_AGAIN;
  80         else {
  81                 uint8_t u;
  82                 ao_fifo_remove(ao_usart_rx_fifo,u);
  83                 c = u;
  84         }
  85         return c;
  86 }
  87
  88 char
  89 ao_serial_getchar(void)
  90 {
  91         int c;
  92         ao_arch_block_interrupts();
  93         while ((c = _ao_serial_pollchar()) == AO_READ_AGAIN)
  94                 ao_sleep(&ao_usart_rx_fifo);
  95         ao_arch_release_interrupts();
  96         return (char) c;
  97 }
  98
  99 void
 100 ao_serial_putchar(char c)
 101 {
 102         ao_arch_block_interrupts();
 103         while (ao_fifo_full(ao_usart_tx_fifo))
 104                 ao_sleep(&ao_usart_tx_fifo);
 105         ao_fifo_insert(ao_usart_tx_fifo, c);
 106         _ao_serial_tx_start();
 107         ao_arch_release_interrupts();
 108 }
 109
 110 void
 111 ao_serial_drain(void)
 112 {
 113         ao_arch_block_interrupts();
 114         while (!ao_fifo_empty(ao_usart_tx_fifo))
 115                 ao_sleep(&ao_usart_tx_fifo);
 116         ao_arch_release_interrupts();
 117 }
 118
 119 void
 120 ao_serial_set_speed(uint8_t speed)
 121 {
 122         if (speed > AO_SERIAL_SPEED_115200)
 123                 return;
 124 #if 0
 125         usart->reg->brr = ao_usart_speeds[speed].brr;
 126 #endif
 127 }
 128
 129 #include "ao_serial_lpc.h"
 130
 131 void
 132 ao_serial_init(void)
 133 {
 134         /* Turn on the USART clock */
 135         lpc_scb.uartclkdiv = 1;
 136
 137 #if SERIAL_0_18_19
 138         lpc_ioconf.pio0_18 = ((LPC_IOCONF_FUNC_PIO0_18_RXD << LPC_IOCONF_FUNC) |
 139                               (LPC_IOCONF_MODE_INACTIVE << LPC_IOCONF_MODE) |
 140                               (0 << LPC_IOCONF_HYS) |
 141                               (0 << LPC_IOCONF_INV) |
 142                               (0 << LPC_IOCONF_OD));
 143         lpc_ioconf.pio0_19 = ((LPC_IOCONF_FUNC_PIO0_19_TXD << LPC_IOCONF_FUNC) |
 144                               (LPC_IOCONF_MODE_INACTIVE << LPC_IOCONF_MODE) |
 145                               (0 << LPC_IOCONF_HYS) |
 146                               (0 << LPC_IOCONF_INV) |
 147                               (0 << LPC_IOCONF_OD));
 148 #endif
 149
 150         /* Turn on the USART */
 151         lpc_scb.sysahbclkctrl |= (1 << LPC_SCB_SYSAHBCLKCTRL_USART);
 152 }
 153
 154