Diff: targets/TARGET_TOSHIBA/TARGET_TMPM066/us_ticker.c

Revision:

172:7d866c31b3c5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_TOSHIBA/TARGET_TMPM066/us_ticker.c	Thu Aug 31 17:27:04 2017 +0100
@@ -0,0 +1,109 @@
+/* mbed Microcontroller Library
+ * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2017 All rights reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "us_ticker_api.h"
+#include "mbed_critical.h"
+
+#define TMR16A_100US                0x960 // fsys = fc = 24MHz, Ttmra = 1/24us, 100us*24us = 2400 = 0x960
+#define TMR16A_SYSCK                ((uint32_t)0x00000001)
+#define TMR16A_RUN                  ((uint32_t)0x00000001)
+#define TMR16A_STOP                 ((uint32_t)0x00000000)
+#define OVERFLOW_32BIT              (0xFFFFFFFF / 0x64)
+
+static uint8_t us_ticker_inited = 0;                // Is ticker initialized yet?
+static volatile uint32_t ticker_int_counter = 0;    // Amount of overflows until user interrupt
+static volatile uint32_t us_ticker = 0;             // timer counter
+
+void INT16A0_IRQHandler(void)
+{
+    us_ticker++;
+
+    if (us_ticker > OVERFLOW_32BIT) {
+        us_ticker = 0;
+    }
+}
+
+void INT16A1_IRQHandler(void)
+{
+    us_ticker_irq_handler();
+}
+
+// initialize us_ticker
+void us_ticker_init(void)
+{
+    // Enable clock supply to TA0
+    CG_SetFcPeriphA(CG_FC_PERIPH_TMR16A, ENABLE);
+    if (us_ticker_inited) {
+        return;
+    }
+    us_ticker_inited = 1;
+
+    // Stops and clear count operation
+    TSB_T16A0->RUN = TMR16A_STOP;
+    TSB_T16A0->CR = TMR16A_SYSCK;
+    // Permits INTTA0 interrupt
+    NVIC_EnableIRQ(INT16A0_IRQn);
+    // Match counter set to max value
+    TSB_T16A0->RG = TMR16A_100US;
+    TSB_T16A0->RUN = TMR16A_RUN;
+}
+
+uint32_t us_ticker_read(void)
+{
+    uint32_t ret_val = 0;
+
+    if (!us_ticker_inited) {
+        us_ticker_init();
+    }
+
+    uint32_t tickerbefore = 0;
+    do {
+        tickerbefore = us_ticker;
+        ret_val = (us_ticker * 100);
+    } while (tickerbefore != us_ticker);
+
+    return ret_val;
+}
+
+void us_ticker_set_interrupt(timestamp_t timestamp)
+{
+    uint32_t delta = 0;
+
+    // Stops and clear count operation
+    TSB_T16A1->RUN = TMR16A_STOP;
+    TSB_T16A1->CR = TMR16A_SYSCK;
+    // Set the compare register
+    delta = (timestamp - us_ticker_read());
+    TSB_T16A1->RG = delta;
+    // Set Interrupt
+    NVIC_EnableIRQ(INT16A1_IRQn);
+    // Start TMR_TA1 timer
+    TSB_T16A1->RUN = TMR16A_RUN;
+}
+
+void us_ticker_fire_interrupt(void)
+{
+    NVIC_SetPendingIRQ(INT16A1_IRQn);
+}
+
+void us_ticker_disable_interrupt(void)
+{
+    NVIC_DisableIRQ(INT16A1_IRQn);
+}
+
+void us_ticker_clear_interrupt(void)
+{
+    //no flags to clear
+}