retargetserial.c
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00017 #include <stdio.h>
00018 #include "em_device.h"
00019 #include "em_cmu.h"
00020 #include "em_int.h"
00021 #include "em_gpio.h"
00022 #include "retargetserial.h"
00023
00024
00029 #if defined(RETARGET_USART)
00030 #include "em_usart.h"
00031 #endif
00032
00033 #if defined(RETARGET_LEUART)
00034 #include "em_leuart.h"
00035 #endif
00036
00037
00038 #define RXBUFSIZE 8
00039 static volatile int rxReadIndex = 0;
00040 static volatile int rxWriteIndex = 0;
00041 static volatile int rxCount = 0;
00042 static volatile uint8_t rxBuffer[RXBUFSIZE];
00043 static uint8_t LFtoCRLF = 0;
00044 static bool initialized = false;
00046
00049 void RETARGET_IRQ_NAME(void)
00050 {
00051 #if defined(RETARGET_USART)
00052 if (RETARGET_UART->STATUS & USART_STATUS_RXDATAV)
00053 {
00054 #else
00055 if (RETARGET_UART->IF & LEUART_IF_RXDATAV)
00056 {
00057 #endif
00058
00059
00060 rxBuffer[rxWriteIndex] = RETARGET_RX(RETARGET_UART);
00061 rxWriteIndex++;
00062 rxCount++;
00063 if (rxWriteIndex == RXBUFSIZE)
00064 {
00065 rxWriteIndex = 0;
00066 }
00067
00068 if (rxCount > RXBUFSIZE)
00069 {
00070 rxWriteIndex = 0;
00071 rxCount = 0;
00072 rxReadIndex = 0;
00073 }
00074 }
00075 }
00076
00079
00083 void RETARGET_SerialCrLf(int on)
00084 {
00085 if (on)
00086 LFtoCRLF = 1;
00087 else
00088 LFtoCRLF = 0;
00089 }
00090
00091
00092
00095 void RETARGET_SerialInit(void)
00096 {
00097
00098 CMU_ClockEnable(cmuClock_GPIO, true);
00099
00100 GPIO_PinModeSet(RETARGET_TXPORT, RETARGET_TXPIN, gpioModePushPull, 1);
00101 GPIO_PinModeSet(RETARGET_RXPORT, RETARGET_RXPIN, gpioModeInput, 0);
00102
00103 #if defined(RETARGET_USART)
00104 USART_TypeDef *usart = RETARGET_UART;
00105 USART_InitAsync_TypeDef init = USART_INITASYNC_DEFAULT;
00106
00107 #if defined (RETARGET_PERIPHERAL_ENABLE)
00108
00109 RETARGET_PERIPHERAL_ENABLE();
00110 #endif
00111
00112
00113 CMU_ClockEnable(cmuClock_HFPER, true);
00114 CMU_ClockEnable(RETARGET_CLK, true);
00115
00116
00117 init.enable = usartDisable;
00118 USART_InitAsync(usart, &init);
00119
00120
00121 #if defined( USART_ROUTEPEN_RXPEN )
00122 usart->ROUTEPEN = USART_ROUTEPEN_RXPEN | USART_ROUTEPEN_TXPEN;
00123 usart->ROUTELOC0 = ( usart->ROUTELOC0 &
00124 ~( _USART_ROUTELOC0_TXLOC_MASK
00125 | _USART_ROUTELOC0_RXLOC_MASK ) )
00126 | ( RETARGET_TX_LOCATION << _USART_ROUTELOC0_TXLOC_SHIFT )
00127 | ( RETARGET_RX_LOCATION << _USART_ROUTELOC0_RXLOC_SHIFT );
00128 #else
00129 usart->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | RETARGET_LOCATION;
00130 #endif
00131
00132
00133 USART_IntClear(RETARGET_UART, USART_IF_RXDATAV);
00134 NVIC_ClearPendingIRQ(RETARGET_IRQn);
00135
00136
00137 USART_IntEnable(RETARGET_UART, USART_IF_RXDATAV);
00138 NVIC_EnableIRQ(RETARGET_IRQn);
00139
00140
00141 USART_Enable(usart, usartEnable);
00142
00143 #else
00144 LEUART_TypeDef *leuart = RETARGET_UART;
00145 LEUART_Init_TypeDef init = LEUART_INIT_DEFAULT;
00146
00147
00148 RETARGET_PERIPHERAL_ENABLE();
00149
00150
00151 CMU_ClockEnable(cmuClock_CORELE, true);
00152
00153
00154 CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFXO);
00155
00156 CMU_ClockEnable(RETARGET_CLK, true);
00157
00158
00159 CMU_ClockDivSet(RETARGET_CLK, cmuClkDiv_1);
00160
00161
00162 init.enable = leuartDisable;
00163 LEUART_Init(leuart, &init);
00164
00165 leuart->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN | RETARGET_LOCATION;
00166
00167
00168 LEUART_IntClear(RETARGET_UART, LEUART_IF_RXDATAV);
00169 NVIC_ClearPendingIRQ(RETARGET_IRQn);
00170
00171
00172 LEUART_IntEnable(RETARGET_UART, LEUART_IF_RXDATAV);
00173 NVIC_EnableIRQ(RETARGET_IRQn);
00174
00175
00176 LEUART_Enable(leuart, leuartEnable);
00177 #endif
00178
00179 #if !defined(__CROSSWORKS_ARM) && defined(__GNUC__)
00180 setvbuf(stdout, NULL, _IONBF, 0);
00181 #endif
00182
00183 initialized = true;
00184 }
00185
00186
00187
00191 int RETARGET_ReadChar(void)
00192 {
00193 int c = -1;
00194
00195 if (initialized == false)
00196 {
00197 RETARGET_SerialInit();
00198 }
00199
00200 INT_Disable();
00201 if (rxCount > 0)
00202 {
00203 c = rxBuffer[rxReadIndex];
00204 rxReadIndex++;
00205 if (rxReadIndex == RXBUFSIZE)
00206 {
00207 rxReadIndex = 0;
00208 }
00209 rxCount--;
00210 }
00211 INT_Enable();
00212
00213 return c;
00214 }
00215
00216
00221 int RETARGET_WriteChar(char c)
00222 {
00223 if (initialized == false)
00224 {
00225 RETARGET_SerialInit();
00226 }
00227
00228
00229 if (LFtoCRLF && (c == '\n'))
00230 {
00231 RETARGET_TX(RETARGET_UART, '\r');
00232 }
00233 RETARGET_TX(RETARGET_UART, c);
00234
00235 if (LFtoCRLF && (c == '\r'))
00236 {
00237 RETARGET_TX(RETARGET_UART, '\n');
00238 }
00239
00240 return c;
00241 }