1 /*
2 * <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2>
3 *
4 * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
5 * You may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
7 *
8 * http://www.st.com/software_license_agreement_liberty_v2
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "spi.h"
18 #include "stm32f4xx_conf.h"
19
Spi1Init(void)20 void Spi1Init(void)
21 {
22 GPIO_InitTypeDef gpioInitStructure;
23 SPI_InitTypeDef spiInitStructure;
24
25 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
26 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
27
28 gpioInitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_4 | GPIO_Pin_3;
29 gpioInitStructure.GPIO_Mode = GPIO_Mode_AF;
30 gpioInitStructure.GPIO_OType = GPIO_OType_PP;
31 gpioInitStructure.GPIO_Speed = GPIO_Speed_100MHz;
32 gpioInitStructure.GPIO_PuPd = GPIO_PuPd_UP;
33 GPIO_Init(GPIOB, &gpioInitStructure);
34
35 GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_SPI1);
36 GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_SPI1);
37 GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_SPI1);
38
39 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
40 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
41
42 spiInitStructure.SPI_CRCPolynomial = 7;
43 spiInitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
44 spiInitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
45 spiInitStructure.SPI_Mode = SPI_Mode_Master;
46 spiInitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
47 spiInitStructure.SPI_DataSize = SPI_DataSize_8b;
48 spiInitStructure.SPI_NSS = SPI_NSS_Soft;
49 spiInitStructure.SPI_CPOL = SPI_CPOL_High;
50 spiInitStructure.SPI_CPHA = SPI_CPHA_2Edge;
51
52 SPI_Init(SPI1, &spiInitStructure);
53 SPI_Cmd(SPI1, ENABLE);
54 Spi1ReadWriteByte(0xff);
55 }
56
Spi1SetSpeed(u8 spiBaudRatePrescaler)57 void Spi1SetSpeed(u8 spiBaudRatePrescaler)
58 {
59 assert_param(IS_SPI_BAUDRATE_PRESCALER(spiBaudRatePrescaler));
60 SPI1->CR1 &= 0XFFC7;
61 SPI1->CR1 |= spiBaudRatePrescaler;
62 SPI_Cmd(SPI1, ENABLE);
63 }
64
Spi1ReadWriteByte(u8 txData)65 u8 Spi1ReadWriteByte(u8 txData)
66 {
67 while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET) {
68 ;
69 }
70
71 SPI_I2S_SendData(SPI1, txData);
72
73 while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET) {
74 ;
75 }
76
77 return SPI_I2S_ReceiveData(SPI1);
78 }
79