4  * SPDX-License-Identifier: Apache-2.0
11 #include <zephyr/drivers/spi.h>
14  * @file Sample app using the Fujitsu MB85RS64V FRAM through SPI.
25 static int mb85rs64v_access(const struct device *spi,  in mb85rs64v_access()  argument
27 			    uint8_t cmd, uint16_t addr, void *data, size_t len)  in mb85rs64v_access()  argument
46 		access[1] = (addr >> 8) & 0xFF;  in mb85rs64v_access()
47 		access[2] = addr & 0xFF;  in mb85rs64v_access()
58 			return spi_transceive(spi, spi_cfg, &tx, &rx);  in mb85rs64v_access()
64 	return spi_write(spi, spi_cfg, &tx);  in mb85rs64v_access()
68 static int mb85rs64v_read_id(const struct device *spi,  in mb85rs64v_read_id()  argument
74 	err = mb85rs64v_access(spi, spi_cfg,  in mb85rs64v_read_id()
78 		return -EIO;  in mb85rs64v_read_id()
82 		return -EIO;  in mb85rs64v_read_id()
86 		return -EIO;  in mb85rs64v_read_id()
90 		return -EIO;  in mb85rs64v_read_id()
94 		return -EIO;  in mb85rs64v_read_id()
100 static int write_bytes(const struct device *spi, struct spi_config *spi_cfg,  in write_bytes()  argument
101 		       uint16_t addr, uint8_t *data, uint32_t num_bytes)  in write_bytes()  argument
106 	err = mb85rs64v_access(spi, spi_cfg,  in write_bytes()
110 		return -EIO;  in write_bytes()
114 	err = mb85rs64v_access(spi, spi_cfg,  in write_bytes()
115 			       MB85RS64V_WRITE_CMD, addr, data, num_bytes);  in write_bytes()
117 		printk("Error during SPI write\n");  in write_bytes()
118 		return -EIO;  in write_bytes()
124 static int read_bytes(const struct device *spi, struct spi_config *spi_cfg,  in read_bytes()  argument
125 		      uint16_t addr, uint8_t *data, uint32_t num_bytes)  in read_bytes()  argument
130 	err = mb85rs64v_access(spi, spi_cfg,  in read_bytes()
131 			       MB85RS64V_READ_CMD, addr, data, num_bytes);  in read_bytes()
133 		printk("Error during SPI read\n");  in read_bytes()
134 		return -EIO;  in read_bytes()
142 	const struct device *spi;  in main()  local
148 	spi = DEVICE_DT_GET(DT_ALIAS(spi_1));  in main()
149 	if (!device_is_ready(spi)) {  in main()
150 		printk("SPI device %s is not ready\n", spi->name);  in main()
158 	err = mb85rs64v_read_id(spi, &spi_cfg);  in main()
164 	/* Do one-byte read/write */  in main()
166 	err = write_bytes(spi, &spi_cfg, 0x00, data, 1);  in main()
175 	err = write_bytes(spi, &spi_cfg, 0x01, data, 1);  in main()
184 	err = read_bytes(spi, &spi_cfg, 0x00, data, 1);  in main()
193 	err = read_bytes(spi, &spi_cfg, 0x01, data, 1);  in main()
201 	/* Do multi-byte read/write */  in main()
209 	err = write_bytes(spi, &spi_cfg, 0x00, cmp_data, sizeof(cmp_data));  in main()
218 	err = read_bytes(spi, &spi_cfg, 0x00, data, sizeof(data));  in main()
231 			err = -EIO;  in main()