Diff: targets/TARGET_TOSHIBA/TARGET_TMPM46B/spi_api.c

Revision:

185:08ed48f1de7f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_TOSHIBA/TARGET_TMPM46B/spi_api.c	Thu Apr 19 17:12:19 2018 +0100
@@ -0,0 +1,283 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2017 All rights reserved
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#include "spi_api.h"
+#include "mbed_error.h"
+#include "pinmap.h"
+#include "tmpm46b_ssp.h"
+
+static const PinMap PinMap_SPI_SCLK[] = {
+    {PK4, SPI_0, PIN_DATA(2, 1)},
+    {PF3, SPI_1, PIN_DATA(5, 1)},
+    {PD3, SPI_2, PIN_DATA(1, 1)},
+    {NC,  NC,    0}
+};
+
+static const PinMap PinMap_SPI_MOSI[] = {
+    {PK3, SPI_0, PIN_DATA(2, 1)},
+    {PF4, SPI_1, PIN_DATA(5, 1)},
+    {PD2, SPI_2, PIN_DATA(1, 1)},
+    {NC,  NC,    0}
+};
+
+static const PinMap PinMap_SPI_MISO[] = {
+    {PK2, SPI_0, PIN_DATA(2, 0)},
+    {PF5, SPI_1, PIN_DATA(5, 0)},
+    {PD1, SPI_2, PIN_DATA(1, 0)},
+    {NC,  NC,    0}
+};
+
+static const PinMap PinMap_SPI_SSEL[] = {
+    {PK1, SPI_0, PIN_DATA(2, 1)},
+    {PF6, SPI_1, PIN_DATA(5, 1)},
+    {PD0, SPI_2, PIN_DATA(1, 1)},
+    {NC,  NC,    0}
+};
+
+#define TMPM46B_SPI_2_FMAX    20000000
+#define TMPM46B_SPI_FMAX      10000000
+
+void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
+{
+    SSP_InitTypeDef config;
+
+    // Check pin parameters
+    SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
+    SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
+    SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
+    SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
+    SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
+    SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
+
+    obj->module = (SPIName)pinmap_merge(spi_data, spi_sclk);
+    obj->module = (SPIName)pinmap_merge(spi_data, spi_cntl);
+    MBED_ASSERT((int)obj->module!= NC);
+
+    // Identify SPI module to use
+    switch ((int)obj->module) {
+        case SPI_0:
+            obj->spi = TSB_SSP0;
+            break;
+        case SPI_1:
+            obj->spi = TSB_SSP1;
+            break;
+        case SPI_2:
+            obj->spi = TSB_SSP2;
+            break;
+        default:
+            obj->spi= NULL;
+            obj->module = (SPIName)NC;
+            error("Cannot found SPI module corresponding with input pins.");
+            break;
+    }
+
+    // pin out the spi pins
+    pinmap_pinout(mosi, PinMap_SPI_MOSI);
+    pinmap_pinout(miso, PinMap_SPI_MISO);
+    pinmap_pinout(sclk, PinMap_SPI_SCLK);
+
+    if (ssel != NC) {
+        pinmap_pinout(ssel, PinMap_SPI_SSEL);
+    }
+
+    // Declare Config
+    config.FrameFormat = SSP_FORMAT_SPI;
+
+    // bit_rate = Fsys / (clk_prescale * (clk_rate + 1))
+    config.PreScale = 48;
+    config.ClkRate = 0;
+
+    config.ClkPolarity = SSP_POLARITY_LOW;
+    config.ClkPhase = SSP_PHASE_FIRST_EDGE;
+    config.DataSize = 0x08;
+
+    obj->bits = config.DataSize;
+    config.Mode = SSP_MASTER;
+    SSP_Init(obj->spi, &config);
+
+    // Disable all interrupt
+
+    SSP_SetINTConfig(obj->spi, SSP_INTCFG_NONE);
+    SSP_Enable(obj->spi);
+}
+
+void spi_free(spi_t *obj)
+{
+    SSP_Disable(obj->spi);
+    obj->spi = NULL;
+    obj->module = (SPIName)NC;
+}
+
+void spi_format(spi_t *obj, int bits, int mode, int slave)
+{
+    TSB_SSP_TypeDef* spi;
+    MBED_ASSERT(slave == SSP_MASTER);   // Master mode only
+
+    spi = obj->spi;
+
+    SSP_Disable(spi);
+
+    obj->bits = bits;
+
+    SSP_SetDataSize(spi, bits);
+    SSP_SetClkPolarity(spi, (SSP_ClkPolarity)(mode & 0x1));
+    SSP_SetClkPhase(spi, (SSP_ClkPhase)((mode >> 1) & 0x1));
+
+    SSP_Enable(spi);
+}
+
+void spi_frequency(spi_t *obj, int hz)
+{
+    TSB_SSP_TypeDef* spi;
+
+    // Search Freq data
+    int fr_gear = 1;
+    int cur_hz = 1;
+    int32_t best_diff = TMPM46B_SPI_FMAX;
+    int best_cpsdvsr = 254;
+    int best_scr = 255;
+    int cur_cpsdvsr = 48;
+    int cur_scr = 0;
+    int32_t diff;
+
+    /* Assert Min frequency
+       Hz = Fsys / (CPSDVSR * (SCR + 1))
+       Domain value of CPSDVSR is an even number between 2 to 254
+       Domain value of SCR is a number between 0 to 255
+       Hz Min if CPSDVSR and SCR max (CPSDVSR = 254, SCR = 255)
+    */
+    MBED_ASSERT((SystemCoreClock / 65024) <= (uint32_t)hz);
+
+    if (obj->module == SPI_2) {
+        MBED_ASSERT(hz <= TMPM46B_SPI_2_FMAX);
+    } else {
+        MBED_ASSERT(hz <= TMPM46B_SPI_FMAX); // Default value of SPI_0, SPI_1, SPI_2
+    }
+
+    spi = obj->spi;
+    fr_gear = SystemCoreClock / hz;
+    if (fr_gear < 48) {
+        cur_cpsdvsr = fr_gear;
+    }
+    while (best_diff != 0 && cur_cpsdvsr <= 254) {
+        cur_scr = fr_gear / cur_cpsdvsr - 1;
+
+        if (cur_scr < 0) {
+            break;
+        }
+
+        for (; cur_scr < 256; ++cur_scr) {
+            cur_hz = SystemCoreClock / (cur_cpsdvsr * (1 + cur_scr));
+
+            diff = cur_hz - hz;
+
+            if (diff < 0) {
+                diff = -diff;
+            }
+
+            if (diff < best_diff) {
+                best_cpsdvsr = cur_cpsdvsr;
+                best_scr = cur_scr;
+                best_diff = diff;
+            } else if (diff >= best_diff) {
+                break;
+            }
+        }
+
+        cur_cpsdvsr += 2;
+    }
+
+    SSP_Disable(spi);
+    // Set bit rate of SPI
+    SSP_SetClkPreScale(spi, (uint8_t)best_cpsdvsr, (uint8_t)best_scr);
+    SSP_Enable(spi);
+}
+
+static void spi_clear_FIFOs(TSB_SSP_TypeDef *spi)
+{
+    SSP_FIFOState tx_buf_state, rx_buf_state;
+
+    do {
+        while (SSP_GetWorkState(spi) == BUSY);
+
+        // Get data from receive FIFO
+        SSP_GetRxData(spi);
+
+        // Check receive FIFO
+        rx_buf_state = SSP_GetFIFOState(spi, SSP_RX);
+
+        // Check transmit FIFO
+        tx_buf_state = SSP_GetFIFOState(spi, SSP_TX);
+    } while (rx_buf_state != SSP_FIFO_EMPTY || tx_buf_state != SSP_FIFO_EMPTY);
+}
+
+int spi_master_write(spi_t *obj, int value)
+{
+    TSB_SSP_TypeDef* spi;
+
+    spi = obj->spi;
+    // Clear all data in transmit FIFO and receive FIFO
+    spi_clear_FIFOs(spi);
+    // Transmit data
+    SSP_SetTxData(spi, value);
+    // Wait for transmitting
+    while (SSP_GetWorkState(spi) == BUSY);
+    // Read received data
+    value = SSP_GetRxData(spi);
+
+    return value;
+}
+
+int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length,
+                           char *rx_buffer, int rx_length, char write_fill)
+{
+    int total = (tx_length > rx_length) ? tx_length : rx_length;
+
+    for (int i = 0; i < total; i++) {
+        char out = (i < tx_length) ? tx_buffer[i] : write_fill;
+        char in = spi_master_write(obj, out);
+        if (i < rx_length) {
+            rx_buffer[i] = in;
+        }
+    }
+
+    return total;
+}
+
+int spi_busy(spi_t *obj)
+{
+    WorkState state;
+    state = SSP_GetWorkState(obj->spi);
+    return (state == BUSY);
+}
+
+uint8_t spi_get_module(spi_t *obj)
+{
+    return (uint8_t)(obj->module);
+}