代码如何将STM32F103VET6与30个外部ADC通讯,将控制CS的30个IO口定义成一个数组指针,通讯成功点亮一个led灯,依次循环点亮30个,CS循环拉高拉低
时间: 2024-03-19 15:44:13 浏览: 26
首先,需要定义一个数组指针来存储控制CS的30个IO口。假设这个数组指针名字为 `CS_GPIO`,可以这样定义:
```c
GPIO_TypeDef* CS_GPIO[30] = {GPIOA, GPIOB, GPIOC, ...};
```
接着,需要初始化这30个IO口为输出模式,并将它们拉高:
```c
for (int i = 0; i < 30; i++) {
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_0 << i;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(CS_GPIO[i], &GPIO_InitStruct);
HAL_GPIO_WritePin(CS_GPIO[i], GPIO_InitStruct.Pin, GPIO_PIN_SET);
}
```
然后,需要初始化外部ADC,假设使用的是SPI接口通讯。可以这样初始化:
```c
SPI_HandleTypeDef hspi;
hspi.Instance = SPI1;
hspi.Init.Mode = SPI_MODE_MASTER;
hspi.Init.Direction = SPI_DIRECTION_2LINES;
hspi.Init.DataSize = SPI_DATASIZE_16BIT;
hspi.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi.Init.NSS = SPI_NSS_SOFT;
hspi.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
hspi.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi.Init.TIMode = SPI_TIMODE_DISABLE;
hspi.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi.Init.CRCPolynomial = 7;
HAL_SPI_Init(&hspi);
```
接下来,需要编写一个函数来读取ADC的数据。假设这个函数名字为 `read_adc`,可以这样实现:
```c
uint16_t read_adc(uint8_t channel) {
uint16_t data = 0;
// 选择通道
HAL_GPIO_WritePin(CS_GPIO[channel], GPIO_PIN_0 << channel, GPIO_PIN_RESET);
// 发送读取指令并读取数据
uint16_t cmd = 0x8000 | (channel << 10);
HAL_SPI_Transmit(&hspi, (uint8_t*)&cmd, 1, HAL_MAX_DELAY);
HAL_SPI_Receive(&hspi, (uint8_t*)&data, 1, HAL_MAX_DELAY);
// 取消选择通道
HAL_GPIO_WritePin(CS_GPIO[channel], GPIO_PIN_0 << channel, GPIO_PIN_SET);
return data;
}
```
最后,需要编写一个主函数来循环读取所有ADC的数据,并点亮LED灯。可以这样实现:
```c
int main(void) {
HAL_Init();
SystemClock_Config();
// 初始化CS_GPIO
GPIO_TypeDef* CS_GPIO[30] = {GPIOA, GPIOB, GPIOC, ...};
for (int i = 0; i < 30; i++) {
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_0 << i;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(CS_GPIO[i], &GPIO_InitStruct);
HAL_GPIO_WritePin(CS_GPIO[i], GPIO_InitStruct.Pin, GPIO_PIN_SET);
}
// 初始化SPI接口
SPI_HandleTypeDef hspi;
hspi.Instance = SPI1;
hspi.Init.Mode = SPI_MODE_MASTER;
hspi.Init.Direction = SPI_DIRECTION_2LINES;
hspi.Init.DataSize = SPI_DATASIZE_16BIT;
hspi.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi.Init.NSS = SPI_NSS_SOFT;
hspi.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
hspi.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi.Init.TIMode = SPI_TIMODE_DISABLE;
hspi.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi.Init.CRCPolynomial = 7;
HAL_SPI_Init(&hspi);
// 循环读取ADC数据并点亮LED灯
while (1) {
for (int i = 0; i < 30; i++) {
uint16_t data = read_adc(i);
if (data > 0) {
HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);
HAL_Delay(100);
HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
}
}
}
}
```
在循环中,先选择一个通道,读取ADC数据,如果数据大于0则点亮LED灯,并等待100毫秒后熄灭LED灯,然后取消选择通道。循环会不断执行,直到程序停止。
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