1 /* mbed Microcontroller Library
2 *******************************************************************************
3 * Copyright (c) 2014, STMicroelectronics
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *******************************************************************************
30 #include "mbed_assert.h"
38 #include "PeripheralPins.h"
40 static SPI_HandleTypeDef SpiHandle;
42 static void init_spi(spi_t *obj)
44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
46 __HAL_SPI_DISABLE(&SpiHandle);
48 SpiHandle.Init.Mode = obj->mode;
49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
51 SpiHandle.Init.CLKPhase = obj->cpha;
52 SpiHandle.Init.CLKPolarity = obj->cpol;
53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
54 SpiHandle.Init.CRCPolynomial = 7;
55 SpiHandle.Init.DataSize = obj->bits;
56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
57 SpiHandle.Init.NSS = obj->nss;
58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
60 HAL_SPI_Init(&SpiHandle);
62 __HAL_SPI_ENABLE(&SpiHandle);
65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
67 // Determine the SPI to use
68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
77 MBED_ASSERT(obj->spi != (SPIName)NC);
80 if (obj->spi == SPI_1) {
83 if (obj->spi == SPI_2) {
87 // Configure the SPI pins
88 pinmap_pinout(mosi, PinMap_SPI_MOSI);
89 pinmap_pinout(miso, PinMap_SPI_MISO);
90 pinmap_pinout(sclk, PinMap_SPI_SCLK);
93 obj->bits = SPI_DATASIZE_8BIT;
94 obj->cpol = SPI_POLARITY_LOW;
95 obj->cpha = SPI_PHASE_1EDGE;
96 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
100 obj->pin_sclk = sclk;
101 obj->pin_ssel = ssel;
103 if (ssel == NC) { // SW NSS Master mode
104 obj->mode = SPI_MODE_MASTER;
105 obj->nss = SPI_NSS_SOFT;
107 pinmap_pinout(ssel, PinMap_SPI_SSEL);
108 obj->mode = SPI_MODE_SLAVE;
109 obj->nss = SPI_NSS_HARD_INPUT;
115 void spi_free(spi_t *obj)
117 // Reset SPI and disable clock
118 if (obj->spi == SPI_1) {
119 __SPI1_FORCE_RESET();
120 __SPI1_RELEASE_RESET();
121 __SPI1_CLK_DISABLE();
124 if (obj->spi == SPI_2) {
125 __SPI2_FORCE_RESET();
126 __SPI2_RELEASE_RESET();
127 __SPI2_CLK_DISABLE();
131 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
132 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
133 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
134 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
137 void spi_format(spi_t *obj, int bits, int mode, int slave)
141 obj->bits = SPI_DATASIZE_16BIT;
143 obj->bits = SPI_DATASIZE_8BIT;
148 obj->cpol = SPI_POLARITY_LOW;
149 obj->cpha = SPI_PHASE_1EDGE;
152 obj->cpol = SPI_POLARITY_LOW;
153 obj->cpha = SPI_PHASE_2EDGE;
156 obj->cpol = SPI_POLARITY_HIGH;
157 obj->cpha = SPI_PHASE_1EDGE;
160 obj->cpol = SPI_POLARITY_HIGH;
161 obj->cpha = SPI_PHASE_2EDGE;
166 obj->mode = SPI_MODE_MASTER;
167 obj->nss = SPI_NSS_SOFT;
169 obj->mode = SPI_MODE_SLAVE;
170 obj->nss = SPI_NSS_HARD_INPUT;
176 void spi_frequency(spi_t *obj, int hz)
178 if (obj->spi == SPI_1) {
179 // Values depend of PCLK2: 64 MHz if HSI is used, 72 MHz if HSE is used
181 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 250 kHz - 281 kHz
182 } else if ((hz >= 500000) && (hz < 1000000)) {
183 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 500 kHz - 563 kHz
184 } else if ((hz >= 1000000) && (hz < 2000000)) {
185 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1 MHz - 1.13 MHz
186 } else if ((hz >= 2000000) && (hz < 4000000)) {
187 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2 MHz - 2.25 MHz
188 } else if ((hz >= 4000000) && (hz < 8000000)) {
189 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 4 MHz - 4.5 MHz
190 } else if ((hz >= 8000000) && (hz < 16000000)) {
191 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 8 MHz - 9 MHz
192 } else if ((hz >= 16000000) && (hz < 32000000)) {
193 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 16 MHz - 18 MHz
194 } else { // >= 32000000
195 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 32 MHz - 36 MHz
199 if (obj->spi == SPI_2) {
200 // Values depend of PCLK1: 32 MHz if HSI is used, 36 MHz if HSE is used
202 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz - 141 kHz
203 } else if ((hz >= 250000) && (hz < 500000)) {
204 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz - 281 kHz
205 } else if ((hz >= 500000) && (hz < 1000000)) {
206 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz - 563 kHz
207 } else if ((hz >= 1000000) && (hz < 2000000)) {
208 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz - 1.13 MHz
209 } else if ((hz >= 2000000) && (hz < 4000000)) {
210 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz - 2.25 MHz
211 } else if ((hz >= 4000000) && (hz < 8000000)) {
212 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz - 4.5 MHz
213 } else if ((hz >= 8000000) && (hz < 16000000)) {
214 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz - 9 MHz
215 } else { // >= 16000000
216 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz - 18 MHz
223 static inline int ssp_readable(spi_t *obj)
226 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
227 // Check if data is received
228 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
232 static inline int ssp_writeable(spi_t *obj)
235 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
236 // Check if data is transmitted
237 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
241 static inline void ssp_write(spi_t *obj, int value)
243 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
244 while (!ssp_writeable(obj));
245 if (obj->bits == SPI_DATASIZE_8BIT) {
246 // Force 8-bit access to the data register
247 uint8_t *p_spi_dr = 0;
248 p_spi_dr = (uint8_t *) & (spi->DR);
249 *p_spi_dr = (uint8_t)value;
250 } else { // SPI_DATASIZE_16BIT
251 spi->DR = (uint16_t)value;
255 static inline int ssp_read(spi_t *obj)
257 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
258 while (!ssp_readable(obj));
259 if (obj->bits == SPI_DATASIZE_8BIT) {
260 // Force 8-bit access to the data register
261 uint8_t *p_spi_dr = 0;
262 p_spi_dr = (uint8_t *) & (spi->DR);
263 return (int)(*p_spi_dr);
269 static inline int ssp_busy(spi_t *obj)
272 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
273 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
277 int spi_master_write(spi_t *obj, int value)
279 ssp_write(obj, value);
280 return ssp_read(obj);
283 int spi_slave_receive(spi_t *obj)
285 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
288 int spi_slave_read(spi_t *obj)
290 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
291 while (!ssp_readable(obj));
292 if (obj->bits == SPI_DATASIZE_8BIT) {
293 // Force 8-bit access to the data register
294 uint8_t *p_spi_dr = 0;
295 p_spi_dr = (uint8_t *) & (spi->DR);
296 return (int)(*p_spi_dr);
302 void spi_slave_write(spi_t *obj, int value)
304 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
305 while (!ssp_writeable(obj));
306 if (obj->bits == SPI_DATASIZE_8BIT) {
307 // Force 8-bit access to the data register
308 uint8_t *p_spi_dr = 0;
309 p_spi_dr = (uint8_t *) & (spi->DR);
310 *p_spi_dr = (uint8_t)value;
311 } else { // SPI_DATASIZE_16BIT
312 spi->DR = (uint16_t)value;
316 int spi_busy(spi_t *obj)
318 return ssp_busy(obj);