Mouse code for the MacroRat
mbed-dev/targets/TARGET_NUVOTON/TARGET_M451/spi_api.c@46:b156ef445742, 2017-06-03 (annotated)
- Committer:
- sahilmgandhi
- Date:
- Sat Jun 03 00:22:44 2017 +0000
- Revision:
- 46:b156ef445742
- Parent:
- 18:6a4db94011d3
Final code for internal battlebot competition.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
sahilmgandhi | 18:6a4db94011d3 | 1 | /* mbed Microcontroller Library |
sahilmgandhi | 18:6a4db94011d3 | 2 | * Copyright (c) 2015-2016 Nuvoton |
sahilmgandhi | 18:6a4db94011d3 | 3 | * |
sahilmgandhi | 18:6a4db94011d3 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
sahilmgandhi | 18:6a4db94011d3 | 5 | * you may not use this file except in compliance with the License. |
sahilmgandhi | 18:6a4db94011d3 | 6 | * You may obtain a copy of the License at |
sahilmgandhi | 18:6a4db94011d3 | 7 | * |
sahilmgandhi | 18:6a4db94011d3 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
sahilmgandhi | 18:6a4db94011d3 | 9 | * |
sahilmgandhi | 18:6a4db94011d3 | 10 | * Unless required by applicable law or agreed to in writing, software |
sahilmgandhi | 18:6a4db94011d3 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
sahilmgandhi | 18:6a4db94011d3 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
sahilmgandhi | 18:6a4db94011d3 | 13 | * See the License for the specific language governing permissions and |
sahilmgandhi | 18:6a4db94011d3 | 14 | * limitations under the License. |
sahilmgandhi | 18:6a4db94011d3 | 15 | */ |
sahilmgandhi | 18:6a4db94011d3 | 16 | |
sahilmgandhi | 18:6a4db94011d3 | 17 | #include "spi_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 18 | |
sahilmgandhi | 18:6a4db94011d3 | 19 | #if DEVICE_SPI |
sahilmgandhi | 18:6a4db94011d3 | 20 | |
sahilmgandhi | 18:6a4db94011d3 | 21 | #include "cmsis.h" |
sahilmgandhi | 18:6a4db94011d3 | 22 | #include "pinmap.h" |
sahilmgandhi | 18:6a4db94011d3 | 23 | #include "PeripheralPins.h" |
sahilmgandhi | 18:6a4db94011d3 | 24 | #include "nu_modutil.h" |
sahilmgandhi | 18:6a4db94011d3 | 25 | #include "nu_miscutil.h" |
sahilmgandhi | 18:6a4db94011d3 | 26 | #include "nu_bitutil.h" |
sahilmgandhi | 18:6a4db94011d3 | 27 | |
sahilmgandhi | 18:6a4db94011d3 | 28 | #if DEVICE_SPI_ASYNCH |
sahilmgandhi | 18:6a4db94011d3 | 29 | #include "dma_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 30 | #include "dma.h" |
sahilmgandhi | 18:6a4db94011d3 | 31 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 32 | |
sahilmgandhi | 18:6a4db94011d3 | 33 | #define NU_SPI_FRAME_MIN 8 |
sahilmgandhi | 18:6a4db94011d3 | 34 | #define NU_SPI_FRAME_MAX 32 |
sahilmgandhi | 18:6a4db94011d3 | 35 | #define NU_SPI_FIFO_DEPTH 8 |
sahilmgandhi | 18:6a4db94011d3 | 36 | |
sahilmgandhi | 18:6a4db94011d3 | 37 | struct nu_spi_var { |
sahilmgandhi | 18:6a4db94011d3 | 38 | #if DEVICE_SPI_ASYNCH |
sahilmgandhi | 18:6a4db94011d3 | 39 | uint8_t pdma_perp_tx; |
sahilmgandhi | 18:6a4db94011d3 | 40 | uint8_t pdma_perp_rx; |
sahilmgandhi | 18:6a4db94011d3 | 41 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 42 | }; |
sahilmgandhi | 18:6a4db94011d3 | 43 | |
sahilmgandhi | 18:6a4db94011d3 | 44 | static struct nu_spi_var spi0_var = { |
sahilmgandhi | 18:6a4db94011d3 | 45 | #if DEVICE_SPI_ASYNCH |
sahilmgandhi | 18:6a4db94011d3 | 46 | .pdma_perp_tx = PDMA_SPI0_TX, |
sahilmgandhi | 18:6a4db94011d3 | 47 | .pdma_perp_rx = PDMA_SPI0_RX |
sahilmgandhi | 18:6a4db94011d3 | 48 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 49 | }; |
sahilmgandhi | 18:6a4db94011d3 | 50 | static struct nu_spi_var spi1_var = { |
sahilmgandhi | 18:6a4db94011d3 | 51 | #if DEVICE_SPI_ASYNCH |
sahilmgandhi | 18:6a4db94011d3 | 52 | .pdma_perp_tx = PDMA_SPI1_TX, |
sahilmgandhi | 18:6a4db94011d3 | 53 | .pdma_perp_rx = PDMA_SPI1_RX |
sahilmgandhi | 18:6a4db94011d3 | 54 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 55 | }; |
sahilmgandhi | 18:6a4db94011d3 | 56 | static struct nu_spi_var spi2_var = { |
sahilmgandhi | 18:6a4db94011d3 | 57 | #if DEVICE_SPI_ASYNCH |
sahilmgandhi | 18:6a4db94011d3 | 58 | .pdma_perp_tx = PDMA_SPI2_TX, |
sahilmgandhi | 18:6a4db94011d3 | 59 | .pdma_perp_rx = PDMA_SPI2_RX |
sahilmgandhi | 18:6a4db94011d3 | 60 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 61 | }; |
sahilmgandhi | 18:6a4db94011d3 | 62 | |
sahilmgandhi | 18:6a4db94011d3 | 63 | #if DEVICE_SPI_ASYNCH |
sahilmgandhi | 18:6a4db94011d3 | 64 | static void spi_enable_vector_interrupt(spi_t *obj, uint32_t handler, uint8_t enable); |
sahilmgandhi | 18:6a4db94011d3 | 65 | static void spi_master_enable_interrupt(spi_t *obj, uint8_t enable); |
sahilmgandhi | 18:6a4db94011d3 | 66 | static uint32_t spi_master_write_asynch(spi_t *obj, uint32_t tx_limit); |
sahilmgandhi | 18:6a4db94011d3 | 67 | static uint32_t spi_master_read_asynch(spi_t *obj); |
sahilmgandhi | 18:6a4db94011d3 | 68 | static uint32_t spi_event_check(spi_t *obj); |
sahilmgandhi | 18:6a4db94011d3 | 69 | static void spi_enable_event(spi_t *obj, uint32_t event, uint8_t enable); |
sahilmgandhi | 18:6a4db94011d3 | 70 | static void spi_buffer_set(spi_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length); |
sahilmgandhi | 18:6a4db94011d3 | 71 | static void spi_check_dma_usage(DMAUsage *dma_usage, int *dma_ch_tx, int *dma_ch_rx); |
sahilmgandhi | 18:6a4db94011d3 | 72 | static uint8_t spi_get_data_width(spi_t *obj); |
sahilmgandhi | 18:6a4db94011d3 | 73 | static int spi_is_tx_complete(spi_t *obj); |
sahilmgandhi | 18:6a4db94011d3 | 74 | static int spi_is_rx_complete(spi_t *obj); |
sahilmgandhi | 18:6a4db94011d3 | 75 | static int spi_writeable(spi_t * obj); |
sahilmgandhi | 18:6a4db94011d3 | 76 | static int spi_readable(spi_t * obj); |
sahilmgandhi | 18:6a4db94011d3 | 77 | static void spi_dma_handler_tx(uint32_t id, uint32_t event_dma); |
sahilmgandhi | 18:6a4db94011d3 | 78 | static void spi_dma_handler_rx(uint32_t id, uint32_t event_dma); |
sahilmgandhi | 18:6a4db94011d3 | 79 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 80 | |
sahilmgandhi | 18:6a4db94011d3 | 81 | static uint32_t spi_modinit_mask = 0; |
sahilmgandhi | 18:6a4db94011d3 | 82 | |
sahilmgandhi | 18:6a4db94011d3 | 83 | static const struct nu_modinit_s spi_modinit_tab[] = { |
sahilmgandhi | 18:6a4db94011d3 | 84 | {SPI_0, SPI0_MODULE, CLK_CLKSEL2_SPI0SEL_PCLK0, MODULE_NoMsk, SPI0_RST, SPI0_IRQn, &spi0_var}, |
sahilmgandhi | 18:6a4db94011d3 | 85 | {SPI_1, SPI1_MODULE, CLK_CLKSEL2_SPI1SEL_PCLK1, MODULE_NoMsk, SPI1_RST, SPI1_IRQn, &spi1_var}, |
sahilmgandhi | 18:6a4db94011d3 | 86 | {SPI_2, SPI2_MODULE, CLK_CLKSEL2_SPI2SEL_PCLK0, MODULE_NoMsk, SPI2_RST, SPI2_IRQn, &spi2_var}, |
sahilmgandhi | 18:6a4db94011d3 | 87 | |
sahilmgandhi | 18:6a4db94011d3 | 88 | {NC, 0, 0, 0, 0, (IRQn_Type) 0, NULL} |
sahilmgandhi | 18:6a4db94011d3 | 89 | }; |
sahilmgandhi | 18:6a4db94011d3 | 90 | |
sahilmgandhi | 18:6a4db94011d3 | 91 | void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { |
sahilmgandhi | 18:6a4db94011d3 | 92 | // Determine which SPI_x the pins are used for |
sahilmgandhi | 18:6a4db94011d3 | 93 | uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI); |
sahilmgandhi | 18:6a4db94011d3 | 94 | uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO); |
sahilmgandhi | 18:6a4db94011d3 | 95 | uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK); |
sahilmgandhi | 18:6a4db94011d3 | 96 | uint32_t spi_ssel = pinmap_peripheral(ssel, PinMap_SPI_SSEL); |
sahilmgandhi | 18:6a4db94011d3 | 97 | uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso); |
sahilmgandhi | 18:6a4db94011d3 | 98 | uint32_t spi_cntl = pinmap_merge(spi_sclk, spi_ssel); |
sahilmgandhi | 18:6a4db94011d3 | 99 | obj->spi.spi = (SPIName) pinmap_merge(spi_data, spi_cntl); |
sahilmgandhi | 18:6a4db94011d3 | 100 | MBED_ASSERT((int)obj->spi.spi != NC); |
sahilmgandhi | 18:6a4db94011d3 | 101 | |
sahilmgandhi | 18:6a4db94011d3 | 102 | const struct nu_modinit_s *modinit = get_modinit(obj->spi.spi, spi_modinit_tab); |
sahilmgandhi | 18:6a4db94011d3 | 103 | MBED_ASSERT(modinit != NULL); |
sahilmgandhi | 18:6a4db94011d3 | 104 | MBED_ASSERT(modinit->modname == obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 105 | |
sahilmgandhi | 18:6a4db94011d3 | 106 | // Reset this module |
sahilmgandhi | 18:6a4db94011d3 | 107 | SYS_ResetModule(modinit->rsetidx); |
sahilmgandhi | 18:6a4db94011d3 | 108 | |
sahilmgandhi | 18:6a4db94011d3 | 109 | // Select IP clock source |
sahilmgandhi | 18:6a4db94011d3 | 110 | CLK_SetModuleClock(modinit->clkidx, modinit->clksrc, modinit->clkdiv); |
sahilmgandhi | 18:6a4db94011d3 | 111 | // Enable IP clock |
sahilmgandhi | 18:6a4db94011d3 | 112 | CLK_EnableModuleClock(modinit->clkidx); |
sahilmgandhi | 18:6a4db94011d3 | 113 | |
sahilmgandhi | 18:6a4db94011d3 | 114 | //SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 115 | |
sahilmgandhi | 18:6a4db94011d3 | 116 | pinmap_pinout(mosi, PinMap_SPI_MOSI); |
sahilmgandhi | 18:6a4db94011d3 | 117 | pinmap_pinout(miso, PinMap_SPI_MISO); |
sahilmgandhi | 18:6a4db94011d3 | 118 | pinmap_pinout(sclk, PinMap_SPI_SCLK); |
sahilmgandhi | 18:6a4db94011d3 | 119 | pinmap_pinout(ssel, PinMap_SPI_SSEL); |
sahilmgandhi | 18:6a4db94011d3 | 120 | |
sahilmgandhi | 18:6a4db94011d3 | 121 | obj->spi.pin_mosi = mosi; |
sahilmgandhi | 18:6a4db94011d3 | 122 | obj->spi.pin_miso = miso; |
sahilmgandhi | 18:6a4db94011d3 | 123 | obj->spi.pin_sclk = sclk; |
sahilmgandhi | 18:6a4db94011d3 | 124 | obj->spi.pin_ssel = ssel; |
sahilmgandhi | 18:6a4db94011d3 | 125 | |
sahilmgandhi | 18:6a4db94011d3 | 126 | |
sahilmgandhi | 18:6a4db94011d3 | 127 | // Configure the SPI data format and frequency |
sahilmgandhi | 18:6a4db94011d3 | 128 | //spi_format(obj, 8, 0, SPI_MSB); // 8 bits, mode 0 |
sahilmgandhi | 18:6a4db94011d3 | 129 | //spi_frequency(obj, 1000000); |
sahilmgandhi | 18:6a4db94011d3 | 130 | |
sahilmgandhi | 18:6a4db94011d3 | 131 | #if DEVICE_SPI_ASYNCH |
sahilmgandhi | 18:6a4db94011d3 | 132 | obj->spi.dma_usage = DMA_USAGE_NEVER; |
sahilmgandhi | 18:6a4db94011d3 | 133 | obj->spi.event = 0; |
sahilmgandhi | 18:6a4db94011d3 | 134 | obj->spi.dma_chn_id_tx = DMA_ERROR_OUT_OF_CHANNELS; |
sahilmgandhi | 18:6a4db94011d3 | 135 | obj->spi.dma_chn_id_rx = DMA_ERROR_OUT_OF_CHANNELS; |
sahilmgandhi | 18:6a4db94011d3 | 136 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 137 | |
sahilmgandhi | 18:6a4db94011d3 | 138 | // Mark this module to be inited. |
sahilmgandhi | 18:6a4db94011d3 | 139 | int i = modinit - spi_modinit_tab; |
sahilmgandhi | 18:6a4db94011d3 | 140 | spi_modinit_mask |= 1 << i; |
sahilmgandhi | 18:6a4db94011d3 | 141 | } |
sahilmgandhi | 18:6a4db94011d3 | 142 | |
sahilmgandhi | 18:6a4db94011d3 | 143 | void spi_free(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 144 | { |
sahilmgandhi | 18:6a4db94011d3 | 145 | #if DEVICE_SPI_ASYNCH |
sahilmgandhi | 18:6a4db94011d3 | 146 | if (obj->spi.dma_chn_id_tx != DMA_ERROR_OUT_OF_CHANNELS) { |
sahilmgandhi | 18:6a4db94011d3 | 147 | dma_channel_free(obj->spi.dma_chn_id_tx); |
sahilmgandhi | 18:6a4db94011d3 | 148 | obj->spi.dma_chn_id_tx = DMA_ERROR_OUT_OF_CHANNELS; |
sahilmgandhi | 18:6a4db94011d3 | 149 | } |
sahilmgandhi | 18:6a4db94011d3 | 150 | if (obj->spi.dma_chn_id_rx != DMA_ERROR_OUT_OF_CHANNELS) { |
sahilmgandhi | 18:6a4db94011d3 | 151 | dma_channel_free(obj->spi.dma_chn_id_rx); |
sahilmgandhi | 18:6a4db94011d3 | 152 | obj->spi.dma_chn_id_rx = DMA_ERROR_OUT_OF_CHANNELS; |
sahilmgandhi | 18:6a4db94011d3 | 153 | } |
sahilmgandhi | 18:6a4db94011d3 | 154 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 155 | |
sahilmgandhi | 18:6a4db94011d3 | 156 | SPI_Close((SPI_T *) NU_MODBASE(obj->spi.spi)); |
sahilmgandhi | 18:6a4db94011d3 | 157 | |
sahilmgandhi | 18:6a4db94011d3 | 158 | const struct nu_modinit_s *modinit = get_modinit(obj->spi.spi, spi_modinit_tab); |
sahilmgandhi | 18:6a4db94011d3 | 159 | MBED_ASSERT(modinit != NULL); |
sahilmgandhi | 18:6a4db94011d3 | 160 | MBED_ASSERT(modinit->modname == obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 161 | |
sahilmgandhi | 18:6a4db94011d3 | 162 | SPI_DisableInt(((SPI_T *) NU_MODBASE(obj->spi.spi)), (SPI_FIFO_RXOV_INT_MASK | SPI_FIFO_RXTH_INT_MASK | SPI_FIFO_TXTH_INT_MASK)); |
sahilmgandhi | 18:6a4db94011d3 | 163 | NVIC_DisableIRQ(modinit->irq_n); |
sahilmgandhi | 18:6a4db94011d3 | 164 | |
sahilmgandhi | 18:6a4db94011d3 | 165 | // Disable IP clock |
sahilmgandhi | 18:6a4db94011d3 | 166 | CLK_DisableModuleClock(modinit->clkidx); |
sahilmgandhi | 18:6a4db94011d3 | 167 | |
sahilmgandhi | 18:6a4db94011d3 | 168 | //((struct nu_spi_var *) modinit->var)->obj = NULL; |
sahilmgandhi | 18:6a4db94011d3 | 169 | |
sahilmgandhi | 18:6a4db94011d3 | 170 | // Mark this module to be deinited. |
sahilmgandhi | 18:6a4db94011d3 | 171 | int i = modinit - spi_modinit_tab; |
sahilmgandhi | 18:6a4db94011d3 | 172 | spi_modinit_mask &= ~(1 << i); |
sahilmgandhi | 18:6a4db94011d3 | 173 | } |
sahilmgandhi | 18:6a4db94011d3 | 174 | void spi_format(spi_t *obj, int bits, int mode, int slave) |
sahilmgandhi | 18:6a4db94011d3 | 175 | { |
sahilmgandhi | 18:6a4db94011d3 | 176 | MBED_ASSERT(bits >= NU_SPI_FRAME_MIN && bits <= NU_SPI_FRAME_MAX); |
sahilmgandhi | 18:6a4db94011d3 | 177 | |
sahilmgandhi | 18:6a4db94011d3 | 178 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 179 | |
sahilmgandhi | 18:6a4db94011d3 | 180 | // NOTE 1: All configurations should be ready before enabling SPI peripheral. |
sahilmgandhi | 18:6a4db94011d3 | 181 | // NOTE 2: Re-configuration is allowed only as SPI peripheral is idle. |
sahilmgandhi | 18:6a4db94011d3 | 182 | while (SPI_IS_BUSY(spi_base)); |
sahilmgandhi | 18:6a4db94011d3 | 183 | SPI_DISABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 184 | |
sahilmgandhi | 18:6a4db94011d3 | 185 | SPI_Open(spi_base, |
sahilmgandhi | 18:6a4db94011d3 | 186 | slave ? SPI_SLAVE : SPI_MASTER, |
sahilmgandhi | 18:6a4db94011d3 | 187 | (mode == 0) ? SPI_MODE_0 : (mode == 1) ? SPI_MODE_1 : (mode == 2) ? SPI_MODE_2 : SPI_MODE_3, |
sahilmgandhi | 18:6a4db94011d3 | 188 | bits, |
sahilmgandhi | 18:6a4db94011d3 | 189 | SPI_GetBusClock(spi_base)); |
sahilmgandhi | 18:6a4db94011d3 | 190 | // NOTE: Hardcode to be MSB first. |
sahilmgandhi | 18:6a4db94011d3 | 191 | SPI_SET_MSB_FIRST(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 192 | |
sahilmgandhi | 18:6a4db94011d3 | 193 | if (! slave) { |
sahilmgandhi | 18:6a4db94011d3 | 194 | // Master |
sahilmgandhi | 18:6a4db94011d3 | 195 | if (obj->spi.pin_ssel != NC) { |
sahilmgandhi | 18:6a4db94011d3 | 196 | // Configure SS as low active. |
sahilmgandhi | 18:6a4db94011d3 | 197 | SPI_EnableAutoSS(spi_base, SPI_SS, SPI_SS_ACTIVE_LOW); |
sahilmgandhi | 18:6a4db94011d3 | 198 | } |
sahilmgandhi | 18:6a4db94011d3 | 199 | else { |
sahilmgandhi | 18:6a4db94011d3 | 200 | SPI_DisableAutoSS(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 201 | } |
sahilmgandhi | 18:6a4db94011d3 | 202 | } |
sahilmgandhi | 18:6a4db94011d3 | 203 | else { |
sahilmgandhi | 18:6a4db94011d3 | 204 | // Slave |
sahilmgandhi | 18:6a4db94011d3 | 205 | // Configure SS as low active. |
sahilmgandhi | 18:6a4db94011d3 | 206 | spi_base->SSCTL &= ~SPI_SSCTL_SSACTPOL_Msk; |
sahilmgandhi | 18:6a4db94011d3 | 207 | } |
sahilmgandhi | 18:6a4db94011d3 | 208 | |
sahilmgandhi | 18:6a4db94011d3 | 209 | // NOTE: M451's SPI_Open() will enable SPI transfer (SPI_CTL_SPIEN_Msk). This will violate judgement of spi_active(). Disable it. |
sahilmgandhi | 18:6a4db94011d3 | 210 | SPI_DISABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 211 | } |
sahilmgandhi | 18:6a4db94011d3 | 212 | |
sahilmgandhi | 18:6a4db94011d3 | 213 | void spi_frequency(spi_t *obj, int hz) |
sahilmgandhi | 18:6a4db94011d3 | 214 | { |
sahilmgandhi | 18:6a4db94011d3 | 215 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 216 | |
sahilmgandhi | 18:6a4db94011d3 | 217 | while (SPI_IS_BUSY(spi_base)); |
sahilmgandhi | 18:6a4db94011d3 | 218 | SPI_DISABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 219 | |
sahilmgandhi | 18:6a4db94011d3 | 220 | SPI_SetBusClock((SPI_T *) NU_MODBASE(obj->spi.spi), hz); |
sahilmgandhi | 18:6a4db94011d3 | 221 | } |
sahilmgandhi | 18:6a4db94011d3 | 222 | |
sahilmgandhi | 18:6a4db94011d3 | 223 | |
sahilmgandhi | 18:6a4db94011d3 | 224 | int spi_master_write(spi_t *obj, int value) |
sahilmgandhi | 18:6a4db94011d3 | 225 | { |
sahilmgandhi | 18:6a4db94011d3 | 226 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 227 | |
sahilmgandhi | 18:6a4db94011d3 | 228 | // NOTE: Data in receive FIFO can be read out via ICE. |
sahilmgandhi | 18:6a4db94011d3 | 229 | SPI_ENABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 230 | |
sahilmgandhi | 18:6a4db94011d3 | 231 | // Wait for tx buffer empty |
sahilmgandhi | 18:6a4db94011d3 | 232 | while(! spi_writeable(obj)); |
sahilmgandhi | 18:6a4db94011d3 | 233 | SPI_WRITE_TX(spi_base, value); |
sahilmgandhi | 18:6a4db94011d3 | 234 | |
sahilmgandhi | 18:6a4db94011d3 | 235 | // Wait for rx buffer full |
sahilmgandhi | 18:6a4db94011d3 | 236 | while (! spi_readable(obj)); |
sahilmgandhi | 18:6a4db94011d3 | 237 | int value2 = SPI_READ_RX(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 238 | |
sahilmgandhi | 18:6a4db94011d3 | 239 | SPI_DISABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 240 | |
sahilmgandhi | 18:6a4db94011d3 | 241 | return value2; |
sahilmgandhi | 18:6a4db94011d3 | 242 | } |
sahilmgandhi | 18:6a4db94011d3 | 243 | |
sahilmgandhi | 18:6a4db94011d3 | 244 | #if DEVICE_SPISLAVE |
sahilmgandhi | 18:6a4db94011d3 | 245 | int spi_slave_receive(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 246 | { |
sahilmgandhi | 18:6a4db94011d3 | 247 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 248 | |
sahilmgandhi | 18:6a4db94011d3 | 249 | SPI_ENABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 250 | |
sahilmgandhi | 18:6a4db94011d3 | 251 | return spi_readable(obj); |
sahilmgandhi | 18:6a4db94011d3 | 252 | }; |
sahilmgandhi | 18:6a4db94011d3 | 253 | |
sahilmgandhi | 18:6a4db94011d3 | 254 | int spi_slave_read(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 255 | { |
sahilmgandhi | 18:6a4db94011d3 | 256 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 257 | |
sahilmgandhi | 18:6a4db94011d3 | 258 | SPI_ENABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 259 | |
sahilmgandhi | 18:6a4db94011d3 | 260 | // Wait for rx buffer full |
sahilmgandhi | 18:6a4db94011d3 | 261 | while (! spi_readable(obj)); |
sahilmgandhi | 18:6a4db94011d3 | 262 | int value = SPI_READ_RX(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 263 | return value; |
sahilmgandhi | 18:6a4db94011d3 | 264 | } |
sahilmgandhi | 18:6a4db94011d3 | 265 | |
sahilmgandhi | 18:6a4db94011d3 | 266 | void spi_slave_write(spi_t *obj, int value) |
sahilmgandhi | 18:6a4db94011d3 | 267 | { |
sahilmgandhi | 18:6a4db94011d3 | 268 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 269 | |
sahilmgandhi | 18:6a4db94011d3 | 270 | SPI_ENABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 271 | |
sahilmgandhi | 18:6a4db94011d3 | 272 | // Wait for tx buffer empty |
sahilmgandhi | 18:6a4db94011d3 | 273 | while(! spi_writeable(obj)); |
sahilmgandhi | 18:6a4db94011d3 | 274 | SPI_WRITE_TX(spi_base, value); |
sahilmgandhi | 18:6a4db94011d3 | 275 | } |
sahilmgandhi | 18:6a4db94011d3 | 276 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 277 | |
sahilmgandhi | 18:6a4db94011d3 | 278 | #if DEVICE_SPI_ASYNCH |
sahilmgandhi | 18:6a4db94011d3 | 279 | void spi_master_transfer(spi_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint8_t bit_width, uint32_t handler, uint32_t event, DMAUsage hint) |
sahilmgandhi | 18:6a4db94011d3 | 280 | { |
sahilmgandhi | 18:6a4db94011d3 | 281 | //MBED_ASSERT(bits >= NU_SPI_FRAME_MIN && bits <= NU_SPI_FRAME_MAX); |
sahilmgandhi | 18:6a4db94011d3 | 282 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 283 | SPI_SET_DATA_WIDTH(spi_base, bit_width); |
sahilmgandhi | 18:6a4db94011d3 | 284 | |
sahilmgandhi | 18:6a4db94011d3 | 285 | obj->spi.dma_usage = hint; |
sahilmgandhi | 18:6a4db94011d3 | 286 | spi_check_dma_usage(&obj->spi.dma_usage, &obj->spi.dma_chn_id_tx, &obj->spi.dma_chn_id_rx); |
sahilmgandhi | 18:6a4db94011d3 | 287 | uint32_t data_width = spi_get_data_width(obj); |
sahilmgandhi | 18:6a4db94011d3 | 288 | // Conditions to go DMA way: |
sahilmgandhi | 18:6a4db94011d3 | 289 | // (1) No DMA support for non-8 multiple data width. |
sahilmgandhi | 18:6a4db94011d3 | 290 | // (2) tx length >= rx length. Otherwise, as tx DMA is done, no bus activity for remaining rx. |
sahilmgandhi | 18:6a4db94011d3 | 291 | if ((data_width % 8) || |
sahilmgandhi | 18:6a4db94011d3 | 292 | (tx_length < rx_length)) { |
sahilmgandhi | 18:6a4db94011d3 | 293 | obj->spi.dma_usage = DMA_USAGE_NEVER; |
sahilmgandhi | 18:6a4db94011d3 | 294 | dma_channel_free(obj->spi.dma_chn_id_tx); |
sahilmgandhi | 18:6a4db94011d3 | 295 | obj->spi.dma_chn_id_tx = DMA_ERROR_OUT_OF_CHANNELS; |
sahilmgandhi | 18:6a4db94011d3 | 296 | dma_channel_free(obj->spi.dma_chn_id_rx); |
sahilmgandhi | 18:6a4db94011d3 | 297 | obj->spi.dma_chn_id_rx = DMA_ERROR_OUT_OF_CHANNELS; |
sahilmgandhi | 18:6a4db94011d3 | 298 | } |
sahilmgandhi | 18:6a4db94011d3 | 299 | |
sahilmgandhi | 18:6a4db94011d3 | 300 | // SPI IRQ is necessary for both interrupt way and DMA way |
sahilmgandhi | 18:6a4db94011d3 | 301 | spi_enable_event(obj, event, 1); |
sahilmgandhi | 18:6a4db94011d3 | 302 | spi_buffer_set(obj, tx, tx_length, rx, rx_length); |
sahilmgandhi | 18:6a4db94011d3 | 303 | |
sahilmgandhi | 18:6a4db94011d3 | 304 | SPI_ENABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 305 | |
sahilmgandhi | 18:6a4db94011d3 | 306 | if (obj->spi.dma_usage == DMA_USAGE_NEVER) { |
sahilmgandhi | 18:6a4db94011d3 | 307 | // Interrupt way |
sahilmgandhi | 18:6a4db94011d3 | 308 | spi_master_write_asynch(obj, NU_SPI_FIFO_DEPTH / 2); |
sahilmgandhi | 18:6a4db94011d3 | 309 | spi_enable_vector_interrupt(obj, handler, 1); |
sahilmgandhi | 18:6a4db94011d3 | 310 | spi_master_enable_interrupt(obj, 1); |
sahilmgandhi | 18:6a4db94011d3 | 311 | } else { |
sahilmgandhi | 18:6a4db94011d3 | 312 | // DMA way |
sahilmgandhi | 18:6a4db94011d3 | 313 | const struct nu_modinit_s *modinit = get_modinit(obj->spi.spi, spi_modinit_tab); |
sahilmgandhi | 18:6a4db94011d3 | 314 | MBED_ASSERT(modinit != NULL); |
sahilmgandhi | 18:6a4db94011d3 | 315 | MBED_ASSERT(modinit->modname == obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 316 | |
sahilmgandhi | 18:6a4db94011d3 | 317 | PDMA_T *pdma_base = dma_modbase(); |
sahilmgandhi | 18:6a4db94011d3 | 318 | |
sahilmgandhi | 18:6a4db94011d3 | 319 | // Configure tx DMA |
sahilmgandhi | 18:6a4db94011d3 | 320 | pdma_base->CHCTL |= 1 << obj->spi.dma_chn_id_tx; // Enable this DMA channel |
sahilmgandhi | 18:6a4db94011d3 | 321 | PDMA_SetTransferMode(obj->spi.dma_chn_id_tx, |
sahilmgandhi | 18:6a4db94011d3 | 322 | ((struct nu_spi_var *) modinit->var)->pdma_perp_tx, // Peripheral connected to this PDMA |
sahilmgandhi | 18:6a4db94011d3 | 323 | 0, // Scatter-gather disabled |
sahilmgandhi | 18:6a4db94011d3 | 324 | 0); // Scatter-gather descriptor address |
sahilmgandhi | 18:6a4db94011d3 | 325 | PDMA_SetTransferCnt(obj->spi.dma_chn_id_tx, |
sahilmgandhi | 18:6a4db94011d3 | 326 | (data_width == 8) ? PDMA_WIDTH_8 : (data_width == 16) ? PDMA_WIDTH_16 : PDMA_WIDTH_32, |
sahilmgandhi | 18:6a4db94011d3 | 327 | tx_length); |
sahilmgandhi | 18:6a4db94011d3 | 328 | PDMA_SetTransferAddr(obj->spi.dma_chn_id_tx, |
sahilmgandhi | 18:6a4db94011d3 | 329 | (uint32_t) tx, // NOTE: |
sahilmgandhi | 18:6a4db94011d3 | 330 | // NUC472: End of source address |
sahilmgandhi | 18:6a4db94011d3 | 331 | // M451: Start of source address |
sahilmgandhi | 18:6a4db94011d3 | 332 | PDMA_SAR_INC, // Source address incremental |
sahilmgandhi | 18:6a4db94011d3 | 333 | (uint32_t) &spi_base->TX, // Destination address |
sahilmgandhi | 18:6a4db94011d3 | 334 | PDMA_DAR_FIX); // Destination address fixed |
sahilmgandhi | 18:6a4db94011d3 | 335 | PDMA_SetBurstType(obj->spi.dma_chn_id_tx, |
sahilmgandhi | 18:6a4db94011d3 | 336 | PDMA_REQ_SINGLE, // Single mode |
sahilmgandhi | 18:6a4db94011d3 | 337 | 0); // Burst size |
sahilmgandhi | 18:6a4db94011d3 | 338 | PDMA_EnableInt(obj->spi.dma_chn_id_tx, |
sahilmgandhi | 18:6a4db94011d3 | 339 | PDMA_INT_TRANS_DONE); // Interrupt type |
sahilmgandhi | 18:6a4db94011d3 | 340 | // Register DMA event handler |
sahilmgandhi | 18:6a4db94011d3 | 341 | dma_set_handler(obj->spi.dma_chn_id_tx, (uint32_t) spi_dma_handler_tx, (uint32_t) obj, DMA_EVENT_ALL); |
sahilmgandhi | 18:6a4db94011d3 | 342 | |
sahilmgandhi | 18:6a4db94011d3 | 343 | // Configure rx DMA |
sahilmgandhi | 18:6a4db94011d3 | 344 | pdma_base->CHCTL |= 1 << obj->spi.dma_chn_id_rx; // Enable this DMA channel |
sahilmgandhi | 18:6a4db94011d3 | 345 | PDMA_SetTransferMode(obj->spi.dma_chn_id_rx, |
sahilmgandhi | 18:6a4db94011d3 | 346 | ((struct nu_spi_var *) modinit->var)->pdma_perp_rx, // Peripheral connected to this PDMA |
sahilmgandhi | 18:6a4db94011d3 | 347 | 0, // Scatter-gather disabled |
sahilmgandhi | 18:6a4db94011d3 | 348 | 0); // Scatter-gather descriptor address |
sahilmgandhi | 18:6a4db94011d3 | 349 | PDMA_SetTransferCnt(obj->spi.dma_chn_id_rx, |
sahilmgandhi | 18:6a4db94011d3 | 350 | (data_width == 8) ? PDMA_WIDTH_8 : (data_width == 16) ? PDMA_WIDTH_16 : PDMA_WIDTH_32, |
sahilmgandhi | 18:6a4db94011d3 | 351 | rx_length); |
sahilmgandhi | 18:6a4db94011d3 | 352 | PDMA_SetTransferAddr(obj->spi.dma_chn_id_rx, |
sahilmgandhi | 18:6a4db94011d3 | 353 | (uint32_t) &spi_base->RX, // Source address |
sahilmgandhi | 18:6a4db94011d3 | 354 | PDMA_SAR_FIX, // Source address fixed |
sahilmgandhi | 18:6a4db94011d3 | 355 | (uint32_t) rx, // NOTE: |
sahilmgandhi | 18:6a4db94011d3 | 356 | // NUC472: End of destination address |
sahilmgandhi | 18:6a4db94011d3 | 357 | // M451: Start of destination address |
sahilmgandhi | 18:6a4db94011d3 | 358 | PDMA_DAR_INC); // Destination address incremental |
sahilmgandhi | 18:6a4db94011d3 | 359 | PDMA_SetBurstType(obj->spi.dma_chn_id_rx, |
sahilmgandhi | 18:6a4db94011d3 | 360 | PDMA_REQ_SINGLE, // Single mode |
sahilmgandhi | 18:6a4db94011d3 | 361 | 0); // Burst size |
sahilmgandhi | 18:6a4db94011d3 | 362 | PDMA_EnableInt(obj->spi.dma_chn_id_rx, |
sahilmgandhi | 18:6a4db94011d3 | 363 | PDMA_INT_TRANS_DONE); // Interrupt type |
sahilmgandhi | 18:6a4db94011d3 | 364 | // Register DMA event handler |
sahilmgandhi | 18:6a4db94011d3 | 365 | dma_set_handler(obj->spi.dma_chn_id_rx, (uint32_t) spi_dma_handler_rx, (uint32_t) obj, DMA_EVENT_ALL); |
sahilmgandhi | 18:6a4db94011d3 | 366 | |
sahilmgandhi | 18:6a4db94011d3 | 367 | // Start tx/rx DMA transfer |
sahilmgandhi | 18:6a4db94011d3 | 368 | spi_enable_vector_interrupt(obj, handler, 1); |
sahilmgandhi | 18:6a4db94011d3 | 369 | // NOTE: It is safer to start rx DMA first and then tx DMA. Otherwise, receive FIFO is subject to overflow by tx DMA. |
sahilmgandhi | 18:6a4db94011d3 | 370 | SPI_TRIGGER_RX_PDMA(((SPI_T *) NU_MODBASE(obj->spi.spi))); |
sahilmgandhi | 18:6a4db94011d3 | 371 | SPI_TRIGGER_TX_PDMA(((SPI_T *) NU_MODBASE(obj->spi.spi))); |
sahilmgandhi | 18:6a4db94011d3 | 372 | spi_master_enable_interrupt(obj, 1); |
sahilmgandhi | 18:6a4db94011d3 | 373 | } |
sahilmgandhi | 18:6a4db94011d3 | 374 | } |
sahilmgandhi | 18:6a4db94011d3 | 375 | |
sahilmgandhi | 18:6a4db94011d3 | 376 | /** |
sahilmgandhi | 18:6a4db94011d3 | 377 | * Abort an SPI transfer |
sahilmgandhi | 18:6a4db94011d3 | 378 | * This is a helper function for event handling. When any of the events listed occurs, the HAL will abort any ongoing |
sahilmgandhi | 18:6a4db94011d3 | 379 | * transfers |
sahilmgandhi | 18:6a4db94011d3 | 380 | * @param[in] obj The SPI peripheral to stop |
sahilmgandhi | 18:6a4db94011d3 | 381 | */ |
sahilmgandhi | 18:6a4db94011d3 | 382 | void spi_abort_asynch(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 383 | { |
sahilmgandhi | 18:6a4db94011d3 | 384 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 385 | PDMA_T *pdma_base = dma_modbase(); |
sahilmgandhi | 18:6a4db94011d3 | 386 | |
sahilmgandhi | 18:6a4db94011d3 | 387 | if (obj->spi.dma_usage != DMA_USAGE_NEVER) { |
sahilmgandhi | 18:6a4db94011d3 | 388 | // Receive FIFO Overrun in case of tx length > rx length on DMA way |
sahilmgandhi | 18:6a4db94011d3 | 389 | if (spi_base->STATUS & SPI_STATUS_RXOVIF_Msk) { |
sahilmgandhi | 18:6a4db94011d3 | 390 | spi_base->STATUS = SPI_STATUS_RXOVIF_Msk; |
sahilmgandhi | 18:6a4db94011d3 | 391 | } |
sahilmgandhi | 18:6a4db94011d3 | 392 | |
sahilmgandhi | 18:6a4db94011d3 | 393 | if (obj->spi.dma_chn_id_tx != DMA_ERROR_OUT_OF_CHANNELS) { |
sahilmgandhi | 18:6a4db94011d3 | 394 | PDMA_DisableInt(obj->spi.dma_chn_id_tx, PDMA_INT_TRANS_DONE); |
sahilmgandhi | 18:6a4db94011d3 | 395 | // FIXME: On NUC472, next PDMA transfer will fail with PDMA_STOP() called. Cause is unknown. |
sahilmgandhi | 18:6a4db94011d3 | 396 | //PDMA_STOP(obj->spi.dma_chn_id_tx); |
sahilmgandhi | 18:6a4db94011d3 | 397 | pdma_base->CHCTL &= ~(1 << obj->spi.dma_chn_id_tx); |
sahilmgandhi | 18:6a4db94011d3 | 398 | } |
sahilmgandhi | 18:6a4db94011d3 | 399 | SPI_DISABLE_TX_PDMA(((SPI_T *) NU_MODBASE(obj->spi.spi))); |
sahilmgandhi | 18:6a4db94011d3 | 400 | |
sahilmgandhi | 18:6a4db94011d3 | 401 | if (obj->spi.dma_chn_id_rx != DMA_ERROR_OUT_OF_CHANNELS) { |
sahilmgandhi | 18:6a4db94011d3 | 402 | PDMA_DisableInt(obj->spi.dma_chn_id_rx, PDMA_INT_TRANS_DONE); |
sahilmgandhi | 18:6a4db94011d3 | 403 | // FIXME: On NUC472, next PDMA transfer will fail with PDMA_STOP() called. Cause is unknown. |
sahilmgandhi | 18:6a4db94011d3 | 404 | //PDMA_STOP(obj->spi.dma_chn_id_rx); |
sahilmgandhi | 18:6a4db94011d3 | 405 | pdma_base->CHCTL &= ~(1 << obj->spi.dma_chn_id_rx); |
sahilmgandhi | 18:6a4db94011d3 | 406 | } |
sahilmgandhi | 18:6a4db94011d3 | 407 | SPI_DISABLE_RX_PDMA(((SPI_T *) NU_MODBASE(obj->spi.spi))); |
sahilmgandhi | 18:6a4db94011d3 | 408 | } |
sahilmgandhi | 18:6a4db94011d3 | 409 | |
sahilmgandhi | 18:6a4db94011d3 | 410 | // Necessary for both interrupt way and DMA way |
sahilmgandhi | 18:6a4db94011d3 | 411 | spi_enable_vector_interrupt(obj, 0, 0); |
sahilmgandhi | 18:6a4db94011d3 | 412 | spi_master_enable_interrupt(obj, 0); |
sahilmgandhi | 18:6a4db94011d3 | 413 | |
sahilmgandhi | 18:6a4db94011d3 | 414 | // FIXME: SPI H/W may get out of state without the busy check. |
sahilmgandhi | 18:6a4db94011d3 | 415 | while (SPI_IS_BUSY(spi_base)); |
sahilmgandhi | 18:6a4db94011d3 | 416 | SPI_DISABLE(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 417 | |
sahilmgandhi | 18:6a4db94011d3 | 418 | SPI_ClearRxFIFO(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 419 | SPI_ClearTxFIFO(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 420 | } |
sahilmgandhi | 18:6a4db94011d3 | 421 | |
sahilmgandhi | 18:6a4db94011d3 | 422 | /** |
sahilmgandhi | 18:6a4db94011d3 | 423 | * Handle the SPI interrupt |
sahilmgandhi | 18:6a4db94011d3 | 424 | * Read frames until the RX FIFO is empty. Write at most as many frames as were read. This way, |
sahilmgandhi | 18:6a4db94011d3 | 425 | * it is unlikely that the RX FIFO will overflow. |
sahilmgandhi | 18:6a4db94011d3 | 426 | * @param[in] obj The SPI peripheral that generated the interrupt |
sahilmgandhi | 18:6a4db94011d3 | 427 | * @return |
sahilmgandhi | 18:6a4db94011d3 | 428 | */ |
sahilmgandhi | 18:6a4db94011d3 | 429 | uint32_t spi_irq_handler_asynch(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 430 | { |
sahilmgandhi | 18:6a4db94011d3 | 431 | // Check for SPI events |
sahilmgandhi | 18:6a4db94011d3 | 432 | uint32_t event = spi_event_check(obj); |
sahilmgandhi | 18:6a4db94011d3 | 433 | if (event) { |
sahilmgandhi | 18:6a4db94011d3 | 434 | spi_abort_asynch(obj); |
sahilmgandhi | 18:6a4db94011d3 | 435 | } |
sahilmgandhi | 18:6a4db94011d3 | 436 | |
sahilmgandhi | 18:6a4db94011d3 | 437 | return (obj->spi.event & event) | ((event & SPI_EVENT_COMPLETE) ? SPI_EVENT_INTERNAL_TRANSFER_COMPLETE : 0); |
sahilmgandhi | 18:6a4db94011d3 | 438 | } |
sahilmgandhi | 18:6a4db94011d3 | 439 | |
sahilmgandhi | 18:6a4db94011d3 | 440 | uint8_t spi_active(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 441 | { |
sahilmgandhi | 18:6a4db94011d3 | 442 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 443 | // FIXME |
sahilmgandhi | 18:6a4db94011d3 | 444 | /* |
sahilmgandhi | 18:6a4db94011d3 | 445 | if ((obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) |
sahilmgandhi | 18:6a4db94011d3 | 446 | || (obj->tx_buff.buffer && obj->tx_buff.pos < obj->tx_buff.length) ){ |
sahilmgandhi | 18:6a4db94011d3 | 447 | return 1; |
sahilmgandhi | 18:6a4db94011d3 | 448 | } else { |
sahilmgandhi | 18:6a4db94011d3 | 449 | // interrupts are disabled, all transaction have been completed |
sahilmgandhi | 18:6a4db94011d3 | 450 | // TODO: checking rx fifo, it reports data eventhough RFDF is not set |
sahilmgandhi | 18:6a4db94011d3 | 451 | return DSPI_HAL_GetIntMode(obj->spi.address, kDspiRxFifoDrainRequest); |
sahilmgandhi | 18:6a4db94011d3 | 452 | }*/ |
sahilmgandhi | 18:6a4db94011d3 | 453 | |
sahilmgandhi | 18:6a4db94011d3 | 454 | //return SPI_IS_BUSY(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 455 | return (spi_base->CTL & SPI_CTL_SPIEN_Msk); |
sahilmgandhi | 18:6a4db94011d3 | 456 | } |
sahilmgandhi | 18:6a4db94011d3 | 457 | |
sahilmgandhi | 18:6a4db94011d3 | 458 | int spi_allow_powerdown(void) |
sahilmgandhi | 18:6a4db94011d3 | 459 | { |
sahilmgandhi | 18:6a4db94011d3 | 460 | uint32_t modinit_mask = spi_modinit_mask; |
sahilmgandhi | 18:6a4db94011d3 | 461 | while (modinit_mask) { |
sahilmgandhi | 18:6a4db94011d3 | 462 | int spi_idx = nu_ctz(modinit_mask); |
sahilmgandhi | 18:6a4db94011d3 | 463 | const struct nu_modinit_s *modinit = spi_modinit_tab + spi_idx; |
sahilmgandhi | 18:6a4db94011d3 | 464 | if (modinit->modname != NC) { |
sahilmgandhi | 18:6a4db94011d3 | 465 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(modinit->modname); |
sahilmgandhi | 18:6a4db94011d3 | 466 | // Disallow entering power-down mode if SPI transfer is enabled. |
sahilmgandhi | 18:6a4db94011d3 | 467 | if (spi_base->CTL & SPI_CTL_SPIEN_Msk) { |
sahilmgandhi | 18:6a4db94011d3 | 468 | return 0; |
sahilmgandhi | 18:6a4db94011d3 | 469 | } |
sahilmgandhi | 18:6a4db94011d3 | 470 | } |
sahilmgandhi | 18:6a4db94011d3 | 471 | modinit_mask &= ~(1 << spi_idx); |
sahilmgandhi | 18:6a4db94011d3 | 472 | } |
sahilmgandhi | 18:6a4db94011d3 | 473 | |
sahilmgandhi | 18:6a4db94011d3 | 474 | return 1; |
sahilmgandhi | 18:6a4db94011d3 | 475 | } |
sahilmgandhi | 18:6a4db94011d3 | 476 | |
sahilmgandhi | 18:6a4db94011d3 | 477 | static int spi_writeable(spi_t * obj) |
sahilmgandhi | 18:6a4db94011d3 | 478 | { |
sahilmgandhi | 18:6a4db94011d3 | 479 | // Receive FIFO must not be full to avoid receive FIFO overflow on next transmit/receive |
sahilmgandhi | 18:6a4db94011d3 | 480 | //return (! SPI_GET_TX_FIFO_FULL_FLAG(((SPI_T *) NU_MODBASE(obj->spi.spi)))) && (SPI_GET_RX_FIFO_COUNT(((SPI_T *) NU_MODBASE(obj->spi.spi))) < NU_SPI_FIFO_DEPTH); |
sahilmgandhi | 18:6a4db94011d3 | 481 | return (! SPI_GET_TX_FIFO_FULL_FLAG(((SPI_T *) NU_MODBASE(obj->spi.spi)))); |
sahilmgandhi | 18:6a4db94011d3 | 482 | } |
sahilmgandhi | 18:6a4db94011d3 | 483 | |
sahilmgandhi | 18:6a4db94011d3 | 484 | static int spi_readable(spi_t * obj) |
sahilmgandhi | 18:6a4db94011d3 | 485 | { |
sahilmgandhi | 18:6a4db94011d3 | 486 | return ! SPI_GET_RX_FIFO_EMPTY_FLAG(((SPI_T *) NU_MODBASE(obj->spi.spi))); |
sahilmgandhi | 18:6a4db94011d3 | 487 | } |
sahilmgandhi | 18:6a4db94011d3 | 488 | |
sahilmgandhi | 18:6a4db94011d3 | 489 | static void spi_enable_event(spi_t *obj, uint32_t event, uint8_t enable) |
sahilmgandhi | 18:6a4db94011d3 | 490 | { |
sahilmgandhi | 18:6a4db94011d3 | 491 | obj->spi.event &= ~SPI_EVENT_ALL; |
sahilmgandhi | 18:6a4db94011d3 | 492 | obj->spi.event |= (event & SPI_EVENT_ALL); |
sahilmgandhi | 18:6a4db94011d3 | 493 | if (event & SPI_EVENT_RX_OVERFLOW) { |
sahilmgandhi | 18:6a4db94011d3 | 494 | SPI_EnableInt((SPI_T *) NU_MODBASE(obj->spi.spi), SPI_FIFO_RXOV_INT_MASK); |
sahilmgandhi | 18:6a4db94011d3 | 495 | } |
sahilmgandhi | 18:6a4db94011d3 | 496 | } |
sahilmgandhi | 18:6a4db94011d3 | 497 | |
sahilmgandhi | 18:6a4db94011d3 | 498 | static void spi_enable_vector_interrupt(spi_t *obj, uint32_t handler, uint8_t enable) |
sahilmgandhi | 18:6a4db94011d3 | 499 | { |
sahilmgandhi | 18:6a4db94011d3 | 500 | const struct nu_modinit_s *modinit = get_modinit(obj->spi.spi, spi_modinit_tab); |
sahilmgandhi | 18:6a4db94011d3 | 501 | MBED_ASSERT(modinit != NULL); |
sahilmgandhi | 18:6a4db94011d3 | 502 | MBED_ASSERT(modinit->modname == obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 503 | |
sahilmgandhi | 18:6a4db94011d3 | 504 | if (enable) { |
sahilmgandhi | 18:6a4db94011d3 | 505 | NVIC_SetVector(modinit->irq_n, handler); |
sahilmgandhi | 18:6a4db94011d3 | 506 | NVIC_EnableIRQ(modinit->irq_n); |
sahilmgandhi | 18:6a4db94011d3 | 507 | } |
sahilmgandhi | 18:6a4db94011d3 | 508 | else { |
sahilmgandhi | 18:6a4db94011d3 | 509 | //NVIC_SetVector(modinit->irq_n, handler); |
sahilmgandhi | 18:6a4db94011d3 | 510 | NVIC_DisableIRQ(modinit->irq_n); |
sahilmgandhi | 18:6a4db94011d3 | 511 | } |
sahilmgandhi | 18:6a4db94011d3 | 512 | } |
sahilmgandhi | 18:6a4db94011d3 | 513 | |
sahilmgandhi | 18:6a4db94011d3 | 514 | static void spi_master_enable_interrupt(spi_t *obj, uint8_t enable) |
sahilmgandhi | 18:6a4db94011d3 | 515 | { |
sahilmgandhi | 18:6a4db94011d3 | 516 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 517 | |
sahilmgandhi | 18:6a4db94011d3 | 518 | if (enable) { |
sahilmgandhi | 18:6a4db94011d3 | 519 | // For SPI0, it could be 0 ~ 7. For SPI1 and SPI2, it could be 0 ~ 3. |
sahilmgandhi | 18:6a4db94011d3 | 520 | if (spi_base == (SPI_T *) SPI0_BASE) { |
sahilmgandhi | 18:6a4db94011d3 | 521 | SPI_SetFIFO(spi_base, 4, 4); |
sahilmgandhi | 18:6a4db94011d3 | 522 | } |
sahilmgandhi | 18:6a4db94011d3 | 523 | else { |
sahilmgandhi | 18:6a4db94011d3 | 524 | SPI_SetFIFO(spi_base, 2, 2); |
sahilmgandhi | 18:6a4db94011d3 | 525 | } |
sahilmgandhi | 18:6a4db94011d3 | 526 | //SPI_SET_SUSPEND_CYCLE(spi_base, 4); |
sahilmgandhi | 18:6a4db94011d3 | 527 | // Enable tx/rx FIFO threshold interrupt |
sahilmgandhi | 18:6a4db94011d3 | 528 | SPI_EnableInt(spi_base, SPI_FIFO_RXTH_INT_MASK | SPI_FIFO_TXTH_INT_MASK); |
sahilmgandhi | 18:6a4db94011d3 | 529 | } |
sahilmgandhi | 18:6a4db94011d3 | 530 | else { |
sahilmgandhi | 18:6a4db94011d3 | 531 | SPI_DisableInt(spi_base, SPI_FIFO_RXTH_INT_MASK | SPI_FIFO_TXTH_INT_MASK); |
sahilmgandhi | 18:6a4db94011d3 | 532 | } |
sahilmgandhi | 18:6a4db94011d3 | 533 | } |
sahilmgandhi | 18:6a4db94011d3 | 534 | |
sahilmgandhi | 18:6a4db94011d3 | 535 | static uint32_t spi_event_check(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 536 | { |
sahilmgandhi | 18:6a4db94011d3 | 537 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 538 | uint32_t event = 0; |
sahilmgandhi | 18:6a4db94011d3 | 539 | |
sahilmgandhi | 18:6a4db94011d3 | 540 | if (obj->spi.dma_usage == DMA_USAGE_NEVER) { |
sahilmgandhi | 18:6a4db94011d3 | 541 | uint32_t n_rec = spi_master_read_asynch(obj); |
sahilmgandhi | 18:6a4db94011d3 | 542 | spi_master_write_asynch(obj, n_rec); |
sahilmgandhi | 18:6a4db94011d3 | 543 | } |
sahilmgandhi | 18:6a4db94011d3 | 544 | |
sahilmgandhi | 18:6a4db94011d3 | 545 | if (spi_is_tx_complete(obj) && spi_is_rx_complete(obj)) { |
sahilmgandhi | 18:6a4db94011d3 | 546 | event |= SPI_EVENT_COMPLETE; |
sahilmgandhi | 18:6a4db94011d3 | 547 | } |
sahilmgandhi | 18:6a4db94011d3 | 548 | |
sahilmgandhi | 18:6a4db94011d3 | 549 | // Receive FIFO Overrun |
sahilmgandhi | 18:6a4db94011d3 | 550 | if (spi_base->STATUS & SPI_STATUS_RXOVIF_Msk) { |
sahilmgandhi | 18:6a4db94011d3 | 551 | spi_base->STATUS = SPI_STATUS_RXOVIF_Msk; |
sahilmgandhi | 18:6a4db94011d3 | 552 | // In case of tx length > rx length on DMA way |
sahilmgandhi | 18:6a4db94011d3 | 553 | if (obj->spi.dma_usage == DMA_USAGE_NEVER) { |
sahilmgandhi | 18:6a4db94011d3 | 554 | event |= SPI_EVENT_RX_OVERFLOW; |
sahilmgandhi | 18:6a4db94011d3 | 555 | } |
sahilmgandhi | 18:6a4db94011d3 | 556 | } |
sahilmgandhi | 18:6a4db94011d3 | 557 | |
sahilmgandhi | 18:6a4db94011d3 | 558 | // Receive Time-Out |
sahilmgandhi | 18:6a4db94011d3 | 559 | if (spi_base->STATUS & SPI_STATUS_RXTOIF_Msk) { |
sahilmgandhi | 18:6a4db94011d3 | 560 | spi_base->STATUS = SPI_STATUS_RXTOIF_Msk; |
sahilmgandhi | 18:6a4db94011d3 | 561 | //event |= SPI_EVENT_ERROR; |
sahilmgandhi | 18:6a4db94011d3 | 562 | } |
sahilmgandhi | 18:6a4db94011d3 | 563 | // Transmit FIFO Under-Run |
sahilmgandhi | 18:6a4db94011d3 | 564 | if (spi_base->STATUS & SPI_STATUS_TXUFIF_Msk) { |
sahilmgandhi | 18:6a4db94011d3 | 565 | spi_base->STATUS = SPI_STATUS_TXUFIF_Msk; |
sahilmgandhi | 18:6a4db94011d3 | 566 | event |= SPI_EVENT_ERROR; |
sahilmgandhi | 18:6a4db94011d3 | 567 | } |
sahilmgandhi | 18:6a4db94011d3 | 568 | |
sahilmgandhi | 18:6a4db94011d3 | 569 | return event; |
sahilmgandhi | 18:6a4db94011d3 | 570 | } |
sahilmgandhi | 18:6a4db94011d3 | 571 | |
sahilmgandhi | 18:6a4db94011d3 | 572 | /** |
sahilmgandhi | 18:6a4db94011d3 | 573 | * Send words from the SPI TX buffer until the send limit is reached or the TX FIFO is full |
sahilmgandhi | 18:6a4db94011d3 | 574 | * tx_limit is provided to ensure that the number of SPI frames (words) in flight can be managed. |
sahilmgandhi | 18:6a4db94011d3 | 575 | * @param[in] obj The SPI object on which to operate |
sahilmgandhi | 18:6a4db94011d3 | 576 | * @param[in] tx_limit The maximum number of words to send |
sahilmgandhi | 18:6a4db94011d3 | 577 | * @return The number of SPI words that have been transfered |
sahilmgandhi | 18:6a4db94011d3 | 578 | */ |
sahilmgandhi | 18:6a4db94011d3 | 579 | static uint32_t spi_master_write_asynch(spi_t *obj, uint32_t tx_limit) |
sahilmgandhi | 18:6a4db94011d3 | 580 | { |
sahilmgandhi | 18:6a4db94011d3 | 581 | uint32_t n_words = 0; |
sahilmgandhi | 18:6a4db94011d3 | 582 | uint32_t tx_rmn = obj->tx_buff.length - obj->tx_buff.pos; |
sahilmgandhi | 18:6a4db94011d3 | 583 | uint32_t rx_rmn = obj->rx_buff.length - obj->rx_buff.pos; |
sahilmgandhi | 18:6a4db94011d3 | 584 | uint32_t max_tx = NU_MAX(tx_rmn, rx_rmn); |
sahilmgandhi | 18:6a4db94011d3 | 585 | max_tx = NU_MIN(max_tx, tx_limit); |
sahilmgandhi | 18:6a4db94011d3 | 586 | uint8_t data_width = spi_get_data_width(obj); |
sahilmgandhi | 18:6a4db94011d3 | 587 | uint8_t bytes_per_word = (data_width + 7) / 8; |
sahilmgandhi | 18:6a4db94011d3 | 588 | uint8_t *tx = (uint8_t *)(obj->tx_buff.buffer) + bytes_per_word * obj->tx_buff.pos; |
sahilmgandhi | 18:6a4db94011d3 | 589 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 590 | |
sahilmgandhi | 18:6a4db94011d3 | 591 | while ((n_words < max_tx) && spi_writeable(obj)) { |
sahilmgandhi | 18:6a4db94011d3 | 592 | if (spi_is_tx_complete(obj)) { |
sahilmgandhi | 18:6a4db94011d3 | 593 | // Transmit dummy as transmit buffer is empty |
sahilmgandhi | 18:6a4db94011d3 | 594 | SPI_WRITE_TX(spi_base, 0); |
sahilmgandhi | 18:6a4db94011d3 | 595 | } |
sahilmgandhi | 18:6a4db94011d3 | 596 | else { |
sahilmgandhi | 18:6a4db94011d3 | 597 | switch (bytes_per_word) { |
sahilmgandhi | 18:6a4db94011d3 | 598 | case 4: |
sahilmgandhi | 18:6a4db94011d3 | 599 | SPI_WRITE_TX(spi_base, nu_get32_le(tx)); |
sahilmgandhi | 18:6a4db94011d3 | 600 | tx += 4; |
sahilmgandhi | 18:6a4db94011d3 | 601 | break; |
sahilmgandhi | 18:6a4db94011d3 | 602 | case 2: |
sahilmgandhi | 18:6a4db94011d3 | 603 | SPI_WRITE_TX(spi_base, nu_get16_le(tx)); |
sahilmgandhi | 18:6a4db94011d3 | 604 | tx += 2; |
sahilmgandhi | 18:6a4db94011d3 | 605 | break; |
sahilmgandhi | 18:6a4db94011d3 | 606 | case 1: |
sahilmgandhi | 18:6a4db94011d3 | 607 | SPI_WRITE_TX(spi_base, *((uint8_t *) tx)); |
sahilmgandhi | 18:6a4db94011d3 | 608 | tx += 1; |
sahilmgandhi | 18:6a4db94011d3 | 609 | break; |
sahilmgandhi | 18:6a4db94011d3 | 610 | } |
sahilmgandhi | 18:6a4db94011d3 | 611 | |
sahilmgandhi | 18:6a4db94011d3 | 612 | obj->tx_buff.pos ++; |
sahilmgandhi | 18:6a4db94011d3 | 613 | } |
sahilmgandhi | 18:6a4db94011d3 | 614 | n_words ++; |
sahilmgandhi | 18:6a4db94011d3 | 615 | } |
sahilmgandhi | 18:6a4db94011d3 | 616 | |
sahilmgandhi | 18:6a4db94011d3 | 617 | //Return the number of words that have been sent |
sahilmgandhi | 18:6a4db94011d3 | 618 | return n_words; |
sahilmgandhi | 18:6a4db94011d3 | 619 | } |
sahilmgandhi | 18:6a4db94011d3 | 620 | |
sahilmgandhi | 18:6a4db94011d3 | 621 | /** |
sahilmgandhi | 18:6a4db94011d3 | 622 | * Read SPI words out of the RX FIFO |
sahilmgandhi | 18:6a4db94011d3 | 623 | * Continues reading words out of the RX FIFO until the following condition is met: |
sahilmgandhi | 18:6a4db94011d3 | 624 | * o There are no more words in the FIFO |
sahilmgandhi | 18:6a4db94011d3 | 625 | * OR BOTH OF: |
sahilmgandhi | 18:6a4db94011d3 | 626 | * o At least as many words as the TX buffer have been received |
sahilmgandhi | 18:6a4db94011d3 | 627 | * o At least as many words as the RX buffer have been received |
sahilmgandhi | 18:6a4db94011d3 | 628 | * This way, RX overflows are not generated when the TX buffer size exceeds the RX buffer size |
sahilmgandhi | 18:6a4db94011d3 | 629 | * @param[in] obj The SPI object on which to operate |
sahilmgandhi | 18:6a4db94011d3 | 630 | * @return Returns the number of words extracted from the RX FIFO |
sahilmgandhi | 18:6a4db94011d3 | 631 | */ |
sahilmgandhi | 18:6a4db94011d3 | 632 | static uint32_t spi_master_read_asynch(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 633 | { |
sahilmgandhi | 18:6a4db94011d3 | 634 | uint32_t n_words = 0; |
sahilmgandhi | 18:6a4db94011d3 | 635 | uint32_t tx_rmn = obj->tx_buff.length - obj->tx_buff.pos; |
sahilmgandhi | 18:6a4db94011d3 | 636 | uint32_t rx_rmn = obj->rx_buff.length - obj->rx_buff.pos; |
sahilmgandhi | 18:6a4db94011d3 | 637 | uint32_t max_rx = NU_MAX(tx_rmn, rx_rmn); |
sahilmgandhi | 18:6a4db94011d3 | 638 | uint8_t data_width = spi_get_data_width(obj); |
sahilmgandhi | 18:6a4db94011d3 | 639 | uint8_t bytes_per_word = (data_width + 7) / 8; |
sahilmgandhi | 18:6a4db94011d3 | 640 | uint8_t *rx = (uint8_t *)(obj->rx_buff.buffer) + bytes_per_word * obj->rx_buff.pos; |
sahilmgandhi | 18:6a4db94011d3 | 641 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 642 | |
sahilmgandhi | 18:6a4db94011d3 | 643 | while ((n_words < max_rx) && spi_readable(obj)) { |
sahilmgandhi | 18:6a4db94011d3 | 644 | if (spi_is_rx_complete(obj)) { |
sahilmgandhi | 18:6a4db94011d3 | 645 | // Disregard as receive buffer is full |
sahilmgandhi | 18:6a4db94011d3 | 646 | SPI_READ_RX(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 647 | } |
sahilmgandhi | 18:6a4db94011d3 | 648 | else { |
sahilmgandhi | 18:6a4db94011d3 | 649 | switch (bytes_per_word) { |
sahilmgandhi | 18:6a4db94011d3 | 650 | case 4: { |
sahilmgandhi | 18:6a4db94011d3 | 651 | uint32_t val = SPI_READ_RX(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 652 | nu_set32_le(rx, val); |
sahilmgandhi | 18:6a4db94011d3 | 653 | rx += 4; |
sahilmgandhi | 18:6a4db94011d3 | 654 | break; |
sahilmgandhi | 18:6a4db94011d3 | 655 | } |
sahilmgandhi | 18:6a4db94011d3 | 656 | case 2: { |
sahilmgandhi | 18:6a4db94011d3 | 657 | uint16_t val = SPI_READ_RX(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 658 | nu_set16_le(rx, val); |
sahilmgandhi | 18:6a4db94011d3 | 659 | rx += 2; |
sahilmgandhi | 18:6a4db94011d3 | 660 | break; |
sahilmgandhi | 18:6a4db94011d3 | 661 | } |
sahilmgandhi | 18:6a4db94011d3 | 662 | case 1: |
sahilmgandhi | 18:6a4db94011d3 | 663 | *rx ++ = SPI_READ_RX(spi_base); |
sahilmgandhi | 18:6a4db94011d3 | 664 | break; |
sahilmgandhi | 18:6a4db94011d3 | 665 | } |
sahilmgandhi | 18:6a4db94011d3 | 666 | |
sahilmgandhi | 18:6a4db94011d3 | 667 | obj->rx_buff.pos ++; |
sahilmgandhi | 18:6a4db94011d3 | 668 | } |
sahilmgandhi | 18:6a4db94011d3 | 669 | n_words ++; |
sahilmgandhi | 18:6a4db94011d3 | 670 | } |
sahilmgandhi | 18:6a4db94011d3 | 671 | |
sahilmgandhi | 18:6a4db94011d3 | 672 | // Return the number of words received |
sahilmgandhi | 18:6a4db94011d3 | 673 | return n_words; |
sahilmgandhi | 18:6a4db94011d3 | 674 | } |
sahilmgandhi | 18:6a4db94011d3 | 675 | |
sahilmgandhi | 18:6a4db94011d3 | 676 | static void spi_buffer_set(spi_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length) |
sahilmgandhi | 18:6a4db94011d3 | 677 | { |
sahilmgandhi | 18:6a4db94011d3 | 678 | obj->tx_buff.buffer = (void *) tx; |
sahilmgandhi | 18:6a4db94011d3 | 679 | obj->tx_buff.length = tx_length; |
sahilmgandhi | 18:6a4db94011d3 | 680 | obj->tx_buff.pos = 0; |
sahilmgandhi | 18:6a4db94011d3 | 681 | obj->tx_buff.width = spi_get_data_width(obj); |
sahilmgandhi | 18:6a4db94011d3 | 682 | obj->rx_buff.buffer = rx; |
sahilmgandhi | 18:6a4db94011d3 | 683 | obj->rx_buff.length = rx_length; |
sahilmgandhi | 18:6a4db94011d3 | 684 | obj->rx_buff.pos = 0; |
sahilmgandhi | 18:6a4db94011d3 | 685 | obj->rx_buff.width = spi_get_data_width(obj); |
sahilmgandhi | 18:6a4db94011d3 | 686 | } |
sahilmgandhi | 18:6a4db94011d3 | 687 | |
sahilmgandhi | 18:6a4db94011d3 | 688 | static void spi_check_dma_usage(DMAUsage *dma_usage, int *dma_ch_tx, int *dma_ch_rx) |
sahilmgandhi | 18:6a4db94011d3 | 689 | { |
sahilmgandhi | 18:6a4db94011d3 | 690 | if (*dma_usage != DMA_USAGE_NEVER) { |
sahilmgandhi | 18:6a4db94011d3 | 691 | if (*dma_ch_tx == DMA_ERROR_OUT_OF_CHANNELS) { |
sahilmgandhi | 18:6a4db94011d3 | 692 | *dma_ch_tx = dma_channel_allocate(DMA_CAP_NONE); |
sahilmgandhi | 18:6a4db94011d3 | 693 | } |
sahilmgandhi | 18:6a4db94011d3 | 694 | if (*dma_ch_rx == DMA_ERROR_OUT_OF_CHANNELS) { |
sahilmgandhi | 18:6a4db94011d3 | 695 | *dma_ch_rx = dma_channel_allocate(DMA_CAP_NONE); |
sahilmgandhi | 18:6a4db94011d3 | 696 | } |
sahilmgandhi | 18:6a4db94011d3 | 697 | |
sahilmgandhi | 18:6a4db94011d3 | 698 | if (*dma_ch_tx == DMA_ERROR_OUT_OF_CHANNELS || *dma_ch_rx == DMA_ERROR_OUT_OF_CHANNELS) { |
sahilmgandhi | 18:6a4db94011d3 | 699 | *dma_usage = DMA_USAGE_NEVER; |
sahilmgandhi | 18:6a4db94011d3 | 700 | } |
sahilmgandhi | 18:6a4db94011d3 | 701 | } |
sahilmgandhi | 18:6a4db94011d3 | 702 | |
sahilmgandhi | 18:6a4db94011d3 | 703 | if (*dma_usage == DMA_USAGE_NEVER) { |
sahilmgandhi | 18:6a4db94011d3 | 704 | dma_channel_free(*dma_ch_tx); |
sahilmgandhi | 18:6a4db94011d3 | 705 | *dma_ch_tx = DMA_ERROR_OUT_OF_CHANNELS; |
sahilmgandhi | 18:6a4db94011d3 | 706 | dma_channel_free(*dma_ch_rx); |
sahilmgandhi | 18:6a4db94011d3 | 707 | *dma_ch_rx = DMA_ERROR_OUT_OF_CHANNELS; |
sahilmgandhi | 18:6a4db94011d3 | 708 | } |
sahilmgandhi | 18:6a4db94011d3 | 709 | } |
sahilmgandhi | 18:6a4db94011d3 | 710 | |
sahilmgandhi | 18:6a4db94011d3 | 711 | static uint8_t spi_get_data_width(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 712 | { |
sahilmgandhi | 18:6a4db94011d3 | 713 | SPI_T *spi_base = (SPI_T *) NU_MODBASE(obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 714 | |
sahilmgandhi | 18:6a4db94011d3 | 715 | uint32_t data_width = ((spi_base->CTL & SPI_CTL_DWIDTH_Msk) >> SPI_CTL_DWIDTH_Pos); |
sahilmgandhi | 18:6a4db94011d3 | 716 | if (data_width == 0) { |
sahilmgandhi | 18:6a4db94011d3 | 717 | data_width = 32; |
sahilmgandhi | 18:6a4db94011d3 | 718 | } |
sahilmgandhi | 18:6a4db94011d3 | 719 | |
sahilmgandhi | 18:6a4db94011d3 | 720 | return data_width; |
sahilmgandhi | 18:6a4db94011d3 | 721 | } |
sahilmgandhi | 18:6a4db94011d3 | 722 | |
sahilmgandhi | 18:6a4db94011d3 | 723 | static int spi_is_tx_complete(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 724 | { |
sahilmgandhi | 18:6a4db94011d3 | 725 | // ???: Exclude tx fifo empty check due to no such interrupt on DMA way |
sahilmgandhi | 18:6a4db94011d3 | 726 | return (obj->tx_buff.pos == obj->tx_buff.length); |
sahilmgandhi | 18:6a4db94011d3 | 727 | //return (obj->tx_buff.pos == obj->tx_buff.length && SPI_GET_TX_FIFO_EMPTY_FLAG(((SPI_T *) NU_MODBASE(obj->spi.spi)))); |
sahilmgandhi | 18:6a4db94011d3 | 728 | } |
sahilmgandhi | 18:6a4db94011d3 | 729 | |
sahilmgandhi | 18:6a4db94011d3 | 730 | static int spi_is_rx_complete(spi_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 731 | { |
sahilmgandhi | 18:6a4db94011d3 | 732 | return (obj->rx_buff.pos == obj->rx_buff.length); |
sahilmgandhi | 18:6a4db94011d3 | 733 | } |
sahilmgandhi | 18:6a4db94011d3 | 734 | |
sahilmgandhi | 18:6a4db94011d3 | 735 | static void spi_dma_handler_tx(uint32_t id, uint32_t event_dma) |
sahilmgandhi | 18:6a4db94011d3 | 736 | { |
sahilmgandhi | 18:6a4db94011d3 | 737 | spi_t *obj = (spi_t *) id; |
sahilmgandhi | 18:6a4db94011d3 | 738 | |
sahilmgandhi | 18:6a4db94011d3 | 739 | // FIXME: Pass this error to caller |
sahilmgandhi | 18:6a4db94011d3 | 740 | if (event_dma & DMA_EVENT_ABORT) { |
sahilmgandhi | 18:6a4db94011d3 | 741 | } |
sahilmgandhi | 18:6a4db94011d3 | 742 | // Expect SPI IRQ will catch this transfer done event |
sahilmgandhi | 18:6a4db94011d3 | 743 | if (event_dma & DMA_EVENT_TRANSFER_DONE) { |
sahilmgandhi | 18:6a4db94011d3 | 744 | obj->tx_buff.pos = obj->tx_buff.length; |
sahilmgandhi | 18:6a4db94011d3 | 745 | } |
sahilmgandhi | 18:6a4db94011d3 | 746 | // FIXME: Pass this error to caller |
sahilmgandhi | 18:6a4db94011d3 | 747 | if (event_dma & DMA_EVENT_TIMEOUT) { |
sahilmgandhi | 18:6a4db94011d3 | 748 | } |
sahilmgandhi | 18:6a4db94011d3 | 749 | |
sahilmgandhi | 18:6a4db94011d3 | 750 | const struct nu_modinit_s *modinit = get_modinit(obj->spi.spi, spi_modinit_tab); |
sahilmgandhi | 18:6a4db94011d3 | 751 | MBED_ASSERT(modinit != NULL); |
sahilmgandhi | 18:6a4db94011d3 | 752 | MBED_ASSERT(modinit->modname == obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 753 | |
sahilmgandhi | 18:6a4db94011d3 | 754 | void (*vec)(void) = (void (*)(void)) NVIC_GetVector(modinit->irq_n); |
sahilmgandhi | 18:6a4db94011d3 | 755 | vec(); |
sahilmgandhi | 18:6a4db94011d3 | 756 | } |
sahilmgandhi | 18:6a4db94011d3 | 757 | |
sahilmgandhi | 18:6a4db94011d3 | 758 | static void spi_dma_handler_rx(uint32_t id, uint32_t event_dma) |
sahilmgandhi | 18:6a4db94011d3 | 759 | { |
sahilmgandhi | 18:6a4db94011d3 | 760 | spi_t *obj = (spi_t *) id; |
sahilmgandhi | 18:6a4db94011d3 | 761 | |
sahilmgandhi | 18:6a4db94011d3 | 762 | // FIXME: Pass this error to caller |
sahilmgandhi | 18:6a4db94011d3 | 763 | if (event_dma & DMA_EVENT_ABORT) { |
sahilmgandhi | 18:6a4db94011d3 | 764 | } |
sahilmgandhi | 18:6a4db94011d3 | 765 | // Expect SPI IRQ will catch this transfer done event |
sahilmgandhi | 18:6a4db94011d3 | 766 | if (event_dma & DMA_EVENT_TRANSFER_DONE) { |
sahilmgandhi | 18:6a4db94011d3 | 767 | obj->rx_buff.pos = obj->rx_buff.length; |
sahilmgandhi | 18:6a4db94011d3 | 768 | } |
sahilmgandhi | 18:6a4db94011d3 | 769 | // FIXME: Pass this error to caller |
sahilmgandhi | 18:6a4db94011d3 | 770 | if (event_dma & DMA_EVENT_TIMEOUT) { |
sahilmgandhi | 18:6a4db94011d3 | 771 | } |
sahilmgandhi | 18:6a4db94011d3 | 772 | |
sahilmgandhi | 18:6a4db94011d3 | 773 | const struct nu_modinit_s *modinit = get_modinit(obj->spi.spi, spi_modinit_tab); |
sahilmgandhi | 18:6a4db94011d3 | 774 | MBED_ASSERT(modinit != NULL); |
sahilmgandhi | 18:6a4db94011d3 | 775 | MBED_ASSERT(modinit->modname == obj->spi.spi); |
sahilmgandhi | 18:6a4db94011d3 | 776 | |
sahilmgandhi | 18:6a4db94011d3 | 777 | void (*vec)(void) = (void (*)(void)) NVIC_GetVector(modinit->irq_n); |
sahilmgandhi | 18:6a4db94011d3 | 778 | vec(); |
sahilmgandhi | 18:6a4db94011d3 | 779 | } |
sahilmgandhi | 18:6a4db94011d3 | 780 | |
sahilmgandhi | 18:6a4db94011d3 | 781 | #endif |
sahilmgandhi | 18:6a4db94011d3 | 782 | |
sahilmgandhi | 18:6a4db94011d3 | 783 | #endif |